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Centrifuge modeling study on near-ground explosions and the coupling of ground shock energy in sandy foundation 认领 引用
1
作者 Longhua Guan Zheng Pang +3 位作者 Qiang Lu Yang Ding Yubing Wang Yunmin Chen 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2026年第7期93-109,共17页
Blast effects and energy transfer in near-ground explosions differ significantly from underground scenarios,particularly in terms of ground shock propagation and energy coupling mechanisms across various geological co... Blast effects and energy transfer in near-ground explosions differ significantly from underground scenarios,particularly in terms of ground shock propagation and energy coupling mechanisms across various geological conditions.This study employs centrifuge modeling to simulate near-ground explosions in sandy soil,including surface explosions and airbursts.The focus was on blast-induced cratering,ground shock effects,and energy coupling in sandy foundations.Scaling laws for crater dimensions and ground shock parameters were established and validated based on experimental results.The"modeling of models"series showed good consistency in crater measurements,leading to an empirical formula for estimating crater radius in dry sand.For surface explosions,soil acceleration responses showed single peaks in the central zone(horizontal standoff distance<0.6 m/(kg)1/3)and dual peaks in the near-surface zone(0.79-1.2 m/(kg)1/3)due to combined effects of direct and airburst-induced ground shock.Empirical methods were developed to predict peak acceleration distributions in sandy foundations.Utilizing crater measurements and ground shock propagation laws,a computational approach for evaluating energy transmission in soil foundations was proposed.The study also developed prediction curves for ground shock energy coupling coefficients with scaled blast depth/height,providing a unified model for both underground and near-ground explosions in sandy foundations.The research findings can enhance the methodologies for simulating blast effects and offer a scientific basis for optimizing weapon effectiveness and protective engineering design. 展开更多
关键词 Centrifuge model tests Near-ground explosions Explosion-induced cratering Ground shock Energy coupling
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A hyperelastic constitutive model accounting for tension-shear coupling in preforming modelling of 3D woven fabrics 认领 引用
2
作者 Chuang LIU Yuchen ZHU +4 位作者 Yanqi HU Hui CHENG Kaifu ZHANG Renzi BAI Biao LIANG 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第6期308-320,共13页
The accurate preforming modelling of 3D woven fabrics is essential for their forming quality control and optimization.However,their tension-shear coupling during preforming is not considered in the existing models.To ... The accurate preforming modelling of 3D woven fabrics is essential for their forming quality control and optimization.However,their tension-shear coupling during preforming is not considered in the existing models.To address this issue,an anisotropic hyperelastic constitutive model considering the tension-shear coupling was established for 3D woven fabrics.A picture frame tester was designed and manufactured to investigate tension-shear coupling effect.The results show that the fiber pre-tension can significantly enhance the shear resistance of 3D woven fabrics.The biaxial pre-tension of 1.5%can increase the in-plane shear force by up to 2.25 times compared to that in the pure in-plane shear.The identified tension-shear coupling parameters were integrated into the hyperelastic constitutive model and were implemented via user subroutine in Abaqus.The model’s effectiveness was verified by the hemispherical and fan blade forming experiments.The proposed coupled model demonstrates higher prediction accuracy than the uncoupled model in terms of shear angle and force,which provides a valuable tool for the optimization of forming process of 3D woven fabric. 展开更多
关键词 Constitutive models 3D woven fabrics Finite element method Preforming Tension-shear coupling
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Multi-scale modeling:Analysis and design of thermal–mechanical coupling behavior of integrated thermal protection systems 认领 引用
3
作者 Yang LIU Haitao ZHAO +3 位作者 Kai LIU Zhongjie ZHAO Min FENG Ji'an CHEN 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第3期370-383,共14页
In this study,an integrated thermal protection system was formed by bonding the Carbon/Carbon(C/C) composite thermal insulation layer and carbon foam thermal insulation tile on an aluminum honeycomb sandwich panel acc... In this study,an integrated thermal protection system was formed by bonding the Carbon/Carbon(C/C) composite thermal insulation layer and carbon foam thermal insulation tile on an aluminum honeycomb sandwich panel according to the functions of each layer of materials,and the thermal–mechanical response was analyzed by experimental tests and numerical simulations.First,infrared lamp facility and arcjet wind tunnel tests were used to check the accuracy of the model and calculate the heat-shielding index.Then,using the aerodynamic heat flow and pressure of the vehicles re-entry process,the temperature field and thermal deformation of the thermal protection system were analyzed according to the thermal–mechanical coupling analysis,and its performance requirements as a vehicles shell were evaluated.Analysis show that the thermomechanical properties of each layer were mismatched due to thermal deformation,resulting in debonding at the interlayer interface,which was also observed in the experiment.In addition,a 1 mm gap in the insulation tile promotes the release of thermal stress and reduces interlayer disbonding.According to the multi-scale model,10 thermal cycles(corresponding to the flight process) were analyzed,and the failure and damage evolution process of C/C composites at the microscopic level were revealed.The results of thermal cycling show that the microscopic damage started from the interfacial debonding of the fiber/matrix and ended with the connection of the pores through crack propagation in the matrix.This study provides a solution for analyzing the thermal–mechanical response of a thermal protection system and a design solution for improving reusability. 展开更多
关键词 Thermal protection system Multi-scale models C/C composites Thermal-mechanical coupling Thermal cycle
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Intelligent Identification of Natural Fractures in Tight Sandstone:Optimal Model Coupling in Ensemble Frameworks 认领 引用 被引量：1
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作者 Ma Sheng-lun Zhang Zhao-hui +3 位作者 Zhang Jiao-sheng Liao jian-bo Zhang Wen-ting Zou Jian-dong 《Applied Geophysics》 SCIE CSCD 2026年第1期262-284,432,共23页
The formation and development of natural fractures in tight sandstone reservoirs are governed by a combination of stratigraphic structure,lithological properties,and stress conditions.These fractures often exhibit irr... The formation and development of natural fractures in tight sandstone reservoirs are governed by a combination of stratigraphic structure,lithological properties,and stress conditions.These fractures often exhibit irregular geometries,signicant variations in height,and complex lling materials,leading to intricate conventional logging responses with pronounced multi-solution ambiguities that complicate accurate identication.To address this challenge,this study proposes a multi-model selective coupling identication method.This approach incorporated data cleaning,augmentation,and resampling techniques during the preprocessing phase.Subsequently,multi-dimensional feature extraction and cascade-based feature selection were performed,followed by optimizing model parameters using random search,Bayesian optimization,and grid search algorithms.High-performing models were selected via an evaluation framework.These models were then coupled through voting mechanisms to construct a robust identication model capable of deeply exploring the nonlinear relationship between fractures and logging data.The proposed method achieved an 85.19%fracture identication accuracy in blind tests involving 27 fracture segments across three wells,demonstrating strong identication capability.This methodology provides a valuable reference for fracture identication in hydrocarbon reservoirs within the Hongde area. 展开更多
关键词 Algorithm models Data processing Selective coupling Fracture identification
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Thermo-hydro-mechanical coupling analysis of dynamic responses of green sandstone subjected to high-strain rates:Experimental study and damage-based modeling 认领 引用 被引量：1
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作者 Shi Liu Zewei Chen 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第1期542-565,共24页
Deep rock engineering is affected by coupled thermo-hydro-mechanical(THM)-dynamic fields,necessitating the elucidation of the dynamic mechanical behavior and failure mechanisms.This study utilized a Multi-field Couple... Deep rock engineering is affected by coupled thermo-hydro-mechanical(THM)-dynamic fields,necessitating the elucidation of the dynamic mechanical behavior and failure mechanisms.This study utilized a Multi-field Coupled Controlled Split Hopkinson Pressure Bar(MCC-SHPB)system to elucidate the cross-scale dynamic responses of rocks and the boundaries of failure modes under THM coupling.Impact tests were conducted on green sandstone under coupled conditions of temperature(25℃-80℃),confining pressure(0-15 MPa),and seepage water pressure(0-15 MPa).Scanning electron microscopy(SEM)microstructural characterization and COMSOL Multiphysics numerical simulations were conducted,and a dynamic constitutive theoretical framework and failure-prediction methodology were established.We investigated the impact toughness index(It),dynamic modulus(Ed),dynamic triaxial compressive strength(TCSd),fragmentation degree(W),and failure modes of green sandstone under thermo-confining pressure-seepage-impact loading conditions.The key findings reveal that the(It)reflects different energy regulation mechanisms across different confining pressure regimes.Thermal-microcrack interactions dominate at low pressure,and energy absorption prevails at high pressure.A triphasic dynamic modulus model captures stiffness evolution under energy-driven conditions,revealing cross-scale crack nucleation-propagation and fragment reorganization.The TCSd inflection point signifies energy dissipation shifts,causing nonlinear skeleton bearing-capacity degradation.A critical criterion based on the W was established to distinguish between the two failure modes and predict the unstable failure initiation.Numerical simulations were used to elucidate the effects of inertia-dominated crack propagation and stress wave interference,validating the critical criterion and the predictive accuracy of the theoretical model during cross-scale failure.This study provides a theoretical foundation for assessing the dynamic stability of rock masses subjected to multi-field coupling during deep resource exploitation. 展开更多
关键词 Multi-field coupled controlled split Hopkinson pressure bar(MCC-SHPB) Impact toughness index Modulus evolution model Fragmentation degree Thermo-hydro-mechanical failure criterion
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Mechanical-thermal coupling model and fatigue life analysis of axle-box bearings of high-speed train 认领 引用
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作者 Weixu Zhao Yongqiang Liu +2 位作者 Baosen Wang Shaopu Yang Yingying Liao 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2026年第1期548-562,共15页
The axle box bearings of high-speed trains often operate in extremely harsh environments,bearing loads from different directions.Long-term operation and frequent changes in working conditions can easily lead to axle b... The axle box bearings of high-speed trains often operate in extremely harsh environments,bearing loads from different directions.Long-term operation and frequent changes in working conditions can easily lead to axle box bearing failures.Therefore,it is extremely important to study the mechanism of axle box bearings.Firstly,the medium of thermal deformation establishes a coupling relationship between the system dynamics model and the thermal grid model,and then obtains the thermal force coupling model of the high-speed train axle box bearing.The coupling model is validated from the perspectives of system dynamics response and temperature response,proving its effectiveness in system dynamics response and temperature characteristic response.Comparing the coupling model with the dynamics model,it is found that thermal deformation complicates the dynamic re-sponse.Finally,using the Lundberg-Palmgren(L-P)bearing fatigue calculation method and damage accumu-lation theory,the bearing fatigue life is calculated,and it is found that thermal deformation deteriorates the bearing operating environment,reducing the bearing fatigue life.Finally,by comparing the bearing fatigue life under different working conditions,it is concluded that the faster the vehicle speed,the greater the load,and the smaller the initial radial clearance of the bearing,the fatigue life of the bearing is reduced.The shorter the lifespan. 展开更多
关键词 High-speed train Axle box bearing Mechanical-thermal coupling model Fatigue life
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Virtual Simulation Modeling and Validation of Traffic Measurement Equipment Based on Multi-Physical Field Coupling 认领 引用
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作者 Lin Zhou Jing Wang +3 位作者 Nan Wang Chi Zhang Zhongtian Jin Lucheng Wang 《Journal of Electronic Research and Application》 2026年第6期137-142,共6页
As the smart transportation system continues to evolve,the precise and stable operation of traffic measurement equipment directly determines the overall effectiveness of traffic data monitoring and system management.T... As the smart transportation system continues to evolve,the precise and stable operation of traffic measurement equipment directly determines the overall effectiveness of traffic data monitoring and system management.Traditional field tests are limited by specific operational scenarios,narrow coverage of driving conditions,high equipment wear and maintenance costs,and fail to meet the rigorous performance verification requirements under complex environments.This study integrates theories from mechanics,thermodynamics,and electromagnetism to establish a virtual simulation framework for traffic measurement equipment,enabling accurate replication of real-world operating conditions,conducting performance simulations,and facilitating continuous model refinement.This approach overcomes the limitations inherent in single-physical-field simulations.The outcomes provide robust digital support for equipment performance testing,structural optimization,and condition-specific calibration,thereby advancing the development and modernization of measurement systems in smart transportation applications. 展开更多
关键词 Multi-physics coupling Traffic measurement equipment Virtual simulation Modeling techniques Performance verification
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Failure microscopic mechanism and damage constitutive model of dolomite under water-rock coupling interaction 认领 引用 被引量：5
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作者 SUN Xiao-ming ZHANG Jing +6 位作者 SHI Fu-kun HE Lin-sen ZHANG Yong MIAO Cheng-yu DING Jia-xu MA Li-sha ZHAO Hao-ze 《Journal of Central South University》 SCIE EI CAS CSCD 2025年第4期1431-1446,共16页
To investigate the effects of water and cyclic loading on dolomite’s mechanical properties during deep mining,mechanical experiments on non-pressure water absorption and cyclic loading were conducted.The findings rev... To investigate the effects of water and cyclic loading on dolomite’s mechanical properties during deep mining,mechanical experiments on non-pressure water absorption and cyclic loading were conducted.The findings reveal that the elastic modulus and Poisson ratio of dolomite fluctuate with increasing water content.The mass of water absorption is positively correlated with time and the water absorption stage can be divided into three stages:accelerated,decelerated,and stabilized stages.During this process,the number of pores in dolomite increases,while the pore diameter initially decreases and then fluctuates.Microscopic analysis shows that the proportion of mesopores first increases and then decreases,while micropores exhibit the opposite trend,and the proportion of macropores fluctuates around 0%.A model diagram of structural evolution during water absorption has been developed.Additionally,the softening process of dolomite’s water absorption strength is categorized into three stages:a relatively stable stage,an accelerated softening stage dominated by mesopore water absorption,and a decelerated softening stage characterized by micropore water absorption.A uniaxial damage constitutive model for dolomite under water influence was established based on the Weibull distribution and Mohr-Coulomb strength criterion,and experimental validation indicates its strong applicability. 展开更多
关键词 water-rock coupling dolomite constitutive model microstructure loading-unloading cycle
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Three-dimensional full-scale neutronics/thermal-hydraulics/mechanics coupling analysis-based structural assessment of helium-cooled ceramic breeder blanket for fusion reactor 认领 引用
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作者 Qiang Lian Kui Zhang +6 位作者 Shan-Shan Bu Liang-Ming Pan Wen-Xi Tian Sui-Zheng Qiu Guang-Hui Su Xing-Hua Wu Xiao-Yu Wang 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2026年第6期178-195,共18页
To accelerate the development and utilization of fusion energy,the China Fusion Engineering Test Reactor(CFETR)has been proposed as a bridge between the International Thermonuclear Experimental Reactor and demonstrati... To accelerate the development and utilization of fusion energy,the China Fusion Engineering Test Reactor(CFETR)has been proposed as a bridge between the International Thermonuclear Experimental Reactor and demonstration fusion reactors.The primary objective of the CFETR is to achieve fusion energy transformation and tritium self-sufficiency,which is realized through the function of the blanket.In this study,a neutronicshermal-hydraulics/mechanics coupling method is developed and applied to a helium-cooled ceramic breeder(HCCB)blanket,which is one of the two blanket candidates for the CFETR.A three-dimensional full-scale model is utilized in the coupling analysis to obtain the distributions of the neutronic,thermal-hydraulic,and mechanical parameters.A structural assessment of the CFETR HCCB blanket is then conducted considering steady-state conditions and two transient scenarios.The results demonstrate that following optimization of the blanket structure,the maximum temperatures of the different components remain below the safety limit of the corresponding materials.The structural assessment indicates that the blanket maintains its structural integrity under steady-state conditions.However,immediately after an in-box loss-of-coolant accident,structural failure owing to stress concentration may occur.Additionally,in the early stage of a loss-of-flow accident,the stress at the joint point between the cooling plate and cap exceeds the allowable stress of the material,potentially leading to structural failure within 17 s if no protective response is implemented.These findings provide comprehensive insights into the performance and safety of the CFETR HCCB blanket design. 展开更多
关键词 Structural assessment Fusion blanket Three-dimensional full-scale model Coupling analysis CFETR
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Controlling mechanism and quantitative characterization of thermalhydraulic coupling properties of moraine soil containing frozen inclusions 认领 引用
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作者 ZHU Wenyu LI Changdong +3 位作者 TAN Jie ZHOU Jiaqing WANG Xueying Ehsan PEGAH 《Journal of Mountain Science》 SCIE CSCD 2026年第5期2323-2346,I0050-I0062,共24页
The thermal-hydraulic coupling processes in moraine soils containing frozen inclusions are prevalent in cold alpine regions(for example,the Tibetan Plateau)and closely linked to various mountainous geological hazards.... The thermal-hydraulic coupling processes in moraine soils containing frozen inclusions are prevalent in cold alpine regions(for example,the Tibetan Plateau)and closely linked to various mountainous geological hazards.Despite extensive research,characterizing this coupling process remains challenging.This study investigates the evolution of the thermal-hydraulic properties of moraine soils containing frozen inclusions under warm water flow,considering key parameters and phase change.Parameter values were calibrated using field and laboratory data.The simulation results show the monotonic trend of outlet temperature,ice content and permeability.Thermal conductivity,soil porosity,fluid temperature,frozen inclusion content,and initial matrix permeability play predominant roles in the evolution process.Based on these findings,comprehensive models to quantitatively characterize the seepage evolution process were developed and discriminant models for two equilibrium states were established,incorporating critical factors.Furthermore,an in-depth discussion on the simulation of the phase-change process and the selection of the relative permeability range was provided.The findings enhance our understanding of thermal-hydraulic coupling processes in moraine soils and offer a valuable reference framework for future studies in this field. 展开更多
关键词 Moraine soil Thermal-hydraulic coupling Phase change Sensitivity analysis Semiempirical model
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Damage evolution and constitutive model of limestone with horizontal fissure under the coupled effects of dry-wet cycling and precompression stress 认领 引用
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作者 Shunbo Zhang Zhongping Yang +2 位作者 Yang Gao Miao Liu Shanmeng Hou 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2026年第1期205-228,共24页
To reveal the influence of coupled effects of dry-wet cycling and precompression stress(CEDWCPS)on the damage evolution of limestone with horizontal fissure(LHF),a series of degradation and uniaxial compression tests ... To reveal the influence of coupled effects of dry-wet cycling and precompression stress(CEDWCPS)on the damage evolution of limestone with horizontal fissure(LHF),a series of degradation and uniaxial compression tests were conducted,and a corresponding piecewise damage constitutive model(PDCM)was established.We found that both dry-wet cycling and precompression stress deteriorate the physical properties,alter the microscopic characteristics,and reduce the mechanical properties of the LHF.These degradations are particularly pronounced under the CEDWCPS,although the magnitude of these changes gradually diminishes with the progression of dry-wet cycling.Meanwhile,they also reduce the deformation degree,prolong the micropore compaction stage,shorten the unstable crack propagation stage,lower the frequency and intensity of AE events,decrease the high-amplitude and high-frequency AE signals,enlarge crack scales,and shorten the crack initiation time.Among the changes of these indicators,the dry-wet cycling plays a dominant role.The crack types of LHF under the CEDWCPS(LHFCEDWCPS)are predominantly tensile cracks,supplemented by shear cracks.The failure mode can be defined as tensileshear composite failure.Finally,the established PDCM effectively captures the nonlinear deformation of micropore and the linear deformation of the matrix in LHFCEDWCPS,with all corresponding R2 consistently exceeding 0.97. 展开更多
关键词 Dry-wet cycling Precompression stress Coupled effect Fractured limestone Damage evolution Damage constitutive model
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Performance evaluation of multilateral horizontal wells on flow characteristics and recovery efficiency based on coupled model 认领 引用
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作者 Chun-Xue Cui Xiao-Long Chai +3 位作者 Yue-Wu Liu Zhi-Jun Zhou Guo-Qing Zhang Leng Tian 《Petroleum Science》 SCIE EI CAS CSCD 2026年第2期818-835,共18页
The multi-branch horizontal wells can improve the reservoir dynamic flow profile,restrain water coning,enhance production and recovery efficiency due to large drainage area and low cost,and it is significant importanc... The multi-branch horizontal wells can improve the reservoir dynamic flow profile,restrain water coning,enhance production and recovery efficiency due to large drainage area and low cost,and it is significant importance for academic research and industrial applications.However,the effects of branches interference and wellbore variable mass flow on transient dynamics of water breakthrough,production characteristics and recovery efficiency have long been ignored.To dynamically simulate and evaluate the fluid flow behavior of multilateral horizontal wells,first,the branches interference and coupled relationship between reservoir fluid seepage and wellbore variable mass flow has been investigated in this paper,a coupled model for predicting multilateral horizontal wells dynamic production and water breakthrough time is proposed with arbitrary three-dimensional spatial distribution.Subsequently,the model is validated by comparing the production and breakthrough time between actual production data and simulated software.Last,the performance characteristics including inflow dynamics,production,wellbore pressure drop and water breakthrough dynamic distribution are analyzed.The results indicate that the unstable flow time is shorten and it is about 0.6 h,and the wellbore inflow profile represents a characteristic of"low in the middle and high at both ends"on account of branches interference.The pressure drop of wellbore is mainly affected by friction,and other pressure drop types are acceleration pressure drop,convergence pressure drop and mixed pressure drop in order of influence,respectively.The breakthrough time is prior at junction of main wellbore and branch wellbores,then the bottom water spreads to the middle position of main wellbore and trailing position of each branch wellbore.The branch length has a critical impact on breakthrough time,and the branch numbers also affect it as well as the branch angle.The proposed theoretical model can be used to calculate and predict the production,breakthrough time and recovery efficiency of multilateral horizontal wells,and it supplies strong technical support for further development and enhance oil recovery of bottom water reservoir and actual oil field production. 展开更多
关键词 Coupled model Multilateral horizontal wells Water breakthrough Enhance oil recovery Bottom water reservoir
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Characterization of the permeability evolution of hard and soft rocks under hydro-mechanical coupling conditions 认领 引用
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作者 Zhen Huang Jian Yu +4 位作者 Yun Wu Cong Gong Xiaozhao Li Kui Zhao Dickson Moyo 《Deep Underground Science and Engineering》 EI CAS CSCD 2026年第1期220-232,共13页
Prediction of permeability changes in surrounding rock induced by engineering disturbances is crucial for mitigating tunnel water inrush accidents.This study investigates the progressive failure characteristics and pe... Prediction of permeability changes in surrounding rock induced by engineering disturbances is crucial for mitigating tunnel water inrush accidents.This study investigates the progressive failure characteristics and permeability evolution of hard and soft rocks subjected to triaxial compression.A series of laboratory tests were conducted at confining pressures ranging from 4 to 20 MPa.Experimental results demonstrate that rock permeability variation with strain shows three distinct stages:an initial decrease,a stage of rapid mutation,and a postpeak increase.The concept of critical permeability barrier strength is introduced,representing the stress level at which continuous fracture formation enables significant seepage.Furthermore,two generalized permeability–stress models are developed for soft and hard rocks.The predicted permeability values obtained from these models align well with the experimental data.These findings offer valuable insights into the hydro-mechanical coupling behavior of rocks,providing a foundation for safe construction practices in underground engineering. 展开更多
关键词 hydro-mechanical coupling mathematical model permeability evolution soft and hard rocks water inrush
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Effects of fire severity on the coupling relationship between fine root functional traits and soil physicochemical properties in Pinus tabuliformis forest 认领 引用
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作者 Sifan Chen Min Gao +5 位作者 Aoli Suo Haoyu Feng Junwei Gong Dingye Cheng Feng Chen Xiaodong Liu 《Journal of Forestry Research》 SCIE EI CAS CSCD 2026年第3期195-212,共18页
Plant functional traits are key for understanding the adaptive strategies to environments,and fine roots play a crucial role in nutrient acquisition.Examining the variation of functional traits of fine root and soil p... Plant functional traits are key for understanding the adaptive strategies to environments,and fine roots play a crucial role in nutrient acquisition.Examining the variation of functional traits of fine root and soil physicochemical properties,and investigating their coupling relationships and dominating factors,could provide a theoretical foundation for ecological restoration in the burned forest.We established 12 plots within Pinus tabuliformis Carrière forests subjected to light,moderate and severe fire severities.Through detailed analysis of fine roots and soil physicochemical properties,we evaluated the variations and coupling effects in fine root functional traits and soil properties using the Coupling Coordination Degree Model and Partial Least Squares Path Modeling.Our results showed significant differences in the functional traits of fine root and soil physicochemical properties across fire severities(P<0.05).The coupling coordination degrees between fine root functional features and soil physicochemical properties ranged from 0.4 to 0.6,with the following order:unburned,moderate,severe and light severity.Forest fire negatively impacted the coupling coordination degree indirectly,primarily influenced by the direct positive effects of fine root morphological traits(e.g.,specific root length)and soil nutrient properties(e.g.,nitrogen and available phosphorus).The synergistic recovery of fine root-soil systems in Pinus tabuliformis forests was most pronounced following moderate fire severity,showing a medium-level coordination degree.For light-severity fires,enhancing fine root morphological characteristics through soil warming is recommended.In contrast,it is suggested to apply appropriate nitrogen and soil fertilizers for improving soil conditions after severe fire. 展开更多
关键词 Fire severity Fine root functional traits Soil physicochemical properties Coupling coordination degree modelling Pinus tabuliformis forest Synergistic recovery
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A two-layer model–based coupled simulation study of multi-cluster hydraulic fracture propagation and proppant transport in shale 认领 引用
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作者 Fanhui Zeng Xiaosong Bai +2 位作者 Jianchun Guo Dagan Hu Zhangxing Chen 《Natural Gas Industry B》 2026年第3期348-368,共21页
Effective proppant placement in multi-cluster hydraulic fractures is crucial for shale gas fracturing;however,existing numerical methods face challenges in accurately coupling dynamic fracture propagation with suspend... Effective proppant placement in multi-cluster hydraulic fractures is crucial for shale gas fracturing;however,existing numerical methods face challenges in accurately coupling dynamic fracture propagation with suspended-load transport,bed erosion,and accumulation at the field scale.To address this,a coupled solution integrating the DDM with an improved TLM was developed.This solution incorporates a logarithmic near-bed velocity profile to refine bed shear stress calculations,thereby capturing dynamic flow allocation,fracture-tip extension,and proppant bed evolution within a unified framework.The key findings are:(1)Increasing spacing from 6 m to 25 m minimizes stress interference,reducing flow allocation disparities among clusters by 96%,thereby promoting more uniform fracture propagation and bed-load transport;(2)Higher rates elevate net pressure and reduce pressure drop differences across perforations but increase shear within fractures,exacerbating proppant placement disparities;(3)As viscosity increases from 3 mPa·s to 5 mPa·s,bed-load transport differences intensify,causing a sevenfold rise in placement discrepancies;at 10 mPa·s most proppants remain suspended,transitioning to a suspended-load transport regime and nearly eliminating inter-cluster distribution differences;(4)Larger proppants tend to accumulate near fracture inlets,which can help ensure more uniform inter-cluster distribution.In contrast,smaller proppants are more susceptible to flow variations,often resulting in uneven placement across clusters.(5)Additionally,under high proppant concentrations,proppant dunes reach equilibrium sooner,and creeping motion dominates particle transport,significantly reducing inter-cluster placement non-uniformity.The proposed coupled DDM–TLM model can reasonably predict proppant behavior in multi-cluster fractures and underpins the optimization of shale gas fracturing treatments. 展开更多
关键词 Field-scale proppant placement simulation Coupled fracture propagation-proppant transport model Bed load transport Non-uniform proppant distribution
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Anthropogenic and Natural Drivers of Ecosystem Services and Their Coupling Relationship with County-scale Urbanization:Insights from the Yellow River Basin,China 认领 引用
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作者 BI Yuzhe WANG Ying +2 位作者 LIU Xutong LIU Chongchong ZHENG Liang 《Chinese Geographical Science》 SCIE CAS CSCD 2026年第5期911-926,共16页
Ecosystem services(ESs)are crucial for human survival and development,and changes in ESs are closely linked to both the natural environment and human activity.As counties have become the fundamental unit of China’s n... Ecosystem services(ESs)are crucial for human survival and development,and changes in ESs are closely linked to both the natural environment and human activity.As counties have become the fundamental unit of China’s new urbanization,investigating the dynamic processes of ESs,the driving mechanisms,and their coupling with urbanization at the county scale holds significant theoretical and practical value.However,further research is still needed to analyze the persistent impact of county-scale urbanization on the ecological environment and the coupling relationship between them.This study measured the spatio-temporal characteristics of ESs and urbanization level(UL)in the Yellow River Basin(YRB)from 2000–2020 at county scale,utilizing multi-period land use,meteorological,and statistical data.Subsequently,the research investigated the effects of anthropogenic and natural factors on comprehensive ecosystem services(CES),as well as the coupling relationship between the UL and CESs.The results revealed fluctuating ES levels across different periods,characterized by a general upward trend.Geographically,lower levels were observed in the eastern plain and western desert areas,while higher levels were observed in the central transition area.From 2000–2020,the impervious surface area,population,and gross domestic product(GDP)of the YRB increased consistently.The UL decreased gradually from the southeast to the northwest,with high levels concentrated in city centers.Among anthropogenic factors,population agglomeration and land development significantly influenced CES,with their impact intensifying over time.Slope and elevation were identified as the primary natural factors affecting CES.During the study period,the overall coupling coordination degree of the UL and CES in each county increased,albeit with notable spatial disparities.Regarding synchronization types,the number of downstream counties experiencing ecological losses increased.This study provides insights for managing the relationship between urbanization and ecosystems and offers a framework to migrate the conflict between regional socioeconomic development and the natural environment in the YRB. 展开更多
关键词 ecosystem services(ESs) urbanization level(UL) comprehensive ecosystem services(CES) Integrated Valuation of Ecosystem Services and Trade-offs(InVEST)model coupling coordination relationship Yellow River Basin(YRB),China
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Advances in coupling machine learning with hydrological simulation:A review 认领 引用 被引量：1
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作者 Yu-fei Yan Han-xiao Liu +5 位作者 Shu Xu Qiong-lin Wang Yu-hui Yang Qing-qing Chen Chen-yang Wang Tian-ling Qin 《Water Science and Engineering》 EI CAS CSCD 2026年第1期1-10,共10页
Accurate and efficient hydrological simulation is critically important to sustainable water resources management amidst escalating climate change.As an indispensable scientific tool,hydrological modeling employs mathe... Accurate and efficient hydrological simulation is critically important to sustainable water resources management amidst escalating climate change.As an indispensable scientific tool,hydrological modeling employs mathematical frameworks and computational techniques to quantitatively characterize hydrological processes,thereby playing a vital role in water resources assessment,the prediction and management of extreme hydrological events,and climate change impact evaluation.This review article systematically synthesizes recent advances in traditional hydrological models while critically examining their inherent methodological limitations.It further delineates the evolutionary trajectory of machine learning(ML)techniques in hydrological simulation and highlights the comparative advantages of data-driven ML approaches over conventional paradigms.Through a rigorous analysis of contemporary research,this review article establishes that coupling physically-based hydrological models with data-driven ML architectures represents the most promising pathway for overcoming fundamental bottlenecks in hydrological simulation.Furthermore,this review article concludes by identifying persistent challenges within existing coupling frameworks and projecting key future research directions in this rapidly evolving field. 展开更多
关键词 Hydrological simulation Runoff prediction Machine learning Hydrological model Model coupling
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Optimal Coupling Height of the Atmosphere and Land Surface——An Earth System Modeling Perspective 认领 引用
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作者 Shaofeng LIU Xubin ZENG +6 位作者 Yongjiu DAI Hua YUAN Nan WEI Zhongwang WEI Xingjie LU Shupeng ZHANG Michael A.BRUNKE 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 2025年第3期417-426,共10页
In Earth system modeling,the land surface is coupled with the atmosphere through surface turbulent fluxes.These fluxes are computed using mean meteorological variables between the surface and a reference height in the... In Earth system modeling,the land surface is coupled with the atmosphere through surface turbulent fluxes.These fluxes are computed using mean meteorological variables between the surface and a reference height in the atmosphere.However,the dependence of flux computation on the reference height,which is usually set as the lowest level in the atmosphere in Earth system models,has not received much attention.Based on high-resolution large-eddy simulation(LES)data under unstable conditions,we find the setting of reference height is not trivial within the framework of current surface layer theory.With a reasonable prescription of aerodynamic roughness length(following the setting in LESs),reference heights near the top of the surface layer tend to provide the best estimate of surface fluxes,especially for the momentum flux.Furthermore,this conclusion for the sensible heat flux is insensitive to the ratio of roughness length for momentum versus heat.These results are robust,whether using the classical or revised surface layer theory.They provide a potential guide for setting the proper reference heights for Earth system modeling and can be further tested in the near future using observational data from land–atmosphere feedback observatories. 展开更多
关键词 surface flux estimate reference height land surface modeling atmosphere-land surface coupling large-eddy simulation
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Simulation of the future evolution track of“production-living-ecological”space in a coastal city based on multimodel coupling and wetland protection scenarios 认领 引用
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作者 Yitong Yin Rongjin Yang +5 位作者 Zechen Song Yuying Zhang Yanrong Lu Le Zhang Meiying Sun Xiuhong Li 《Geography and Sustainability》 CSCD 2025年第3期51-63,共13页
Coastal cities hold a special position in the fields of production,living,and ecological research because of their unique wetland resource advantages.However,with global urbanization and rapid economic development,con... Coastal cities hold a special position in the fields of production,living,and ecological research because of their unique wetland resource advantages.However,with global urbanization and rapid economic development,con-flicts among production,living and ecological land are prevalent in coastal cities in the process of maintaining sustainable wetland resources and further developing the social economy.By establishing an SD-PLUS-CCD cou-pling model,this paper analysed the evolution characteristics and driving mechanism of the production-living-ecological space(PLES)and the effects of wetland protection(WLP)on promoting or inhibiting the coordinated development of the PLES in Dongying city during 2005-2060.The results show that(1)from 2005 to 2020,the increase in urban population resulted in a significant transfer of arable land and a reduction of 914 km2 in pro-duction space(PS);(2)from 2020 to 2060,under the WLP scenario,the conversion of wetland ecological space will reduce the PS and living space(LS)by 193.92 km2 and 107.14 km2,respectively,and increase the ecological space(ES)by 327.52 km2;and(3)wetland protection has an inhibitory effect on the coordinated development of PLES in the study area,and the total proportion of noncoordinated areas of PE and living-ecological space will continue to increase during the simulation period.This paper provides a solid theoretical support for the sustain-able management and protection of wetlands in coastal cities and possible PLES conflict patterns and provides a scientific basis for future territorial spatial planning and policy balance analysis. 展开更多
关键词 Wetland protection “Production-living-ecological”space Coupling model Driving mechanism Coordinated and sustainable development
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Retrospective ENSO predictions using an intermediate ocean-atmosphere coupled model by integrating deep-learning sea surface wind stress 认领 引用 被引量：1
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作者 Shuangying DU Rong-Hua ZHANG Chuan GAO 《Journal of Oceanology and Limnology》 SCIE CAS CSCD 2026年第2期477-491,共15页
Various physics-based dynamical and data-based statistical models have been developed for uses in predicting sea surface temperature(SST)evolution in relation to the El Niño-Southern Oscillation(ENSO)over the tro... Various physics-based dynamical and data-based statistical models have been developed for uses in predicting sea surface temperature(SST)evolution in relation to the El Niño-Southern Oscillation(ENSO)over the tropical Pacific.At present,clear limitations remain in their ENSO predictions,with predicted SST anomalies(SSTAs)being widely spread across diverse models and considerable inter-model uncertainty.Fortunately,deep learning(DL)-based modeling has recently made promising advances in ENSO prediction tasks;numerous neural networks(NNs)have been constructed for ENSO predictions.However,most NNs themselves are purely data-driven and lack constraints of the necessary physical processes in the coupled system;there are few studies in which DL models are directly integrated with physics-based dynamical models.Previously,such a new type of intermediate coupled models(ICMs)was developed by directly integrating U-Net-derived sea surface wind stress models with an intermediate ocean dynamical model(denoted as ICM-UNet),with demonstrated success in simulating ENSO evolutions in freely coupled runs.It is thus natural to take a step further for prediction applications.In this study,this new ICM-UNet is applied for retrospective ENSO predictions,the first time that such a fusion of DL atmospheric model and dynamical oceanic model with different architectures can be achieved to make ENSO predictions.The overall evaluations indicate that the ICM-UNet yields valid retrospective predictions during the period 1995–2023,confirming that the ICM-UNet is a credible ocean-atmosphere coupled model for ENSO predictions.In case studies during 2020–2023,the ICM-UNet predictions reveal that SSTAs over the equatorial Pacific evolved into a second-year cooling in late 2021 and a warming tendency in 2023,forming a three-year La Niña and an El Niño event thereafter,which is consistent with the reality.The ICM-UNet successful fusion,taking advantage of both the physical constraints due to dynamical oceanic models and nonlinear representations of wind responses due to DL capacity,further underscores the high adaptability of integrating data-driven NNs into the ocean-atmosphere coupled modeling for ENSO-related studies. 展开更多
关键词 El Niño-Southern Oscillation(ENSO)prediction intermediate coupled model deep learning(DL) an integration of DL model with an ocean model intermediate coupled model(ICM)-UNet
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