Query：
学者姓名：严华祥
Refining：
Year
Type
Indexed by
Source
Complex
Co-
Language
Clean All
Abstract ：
Recent advancements in landfill designs integrate vegetated covers as a sustainable layer to mitigate methane emissions. In this study, we developed a comprehensive analytical model incorporating diffusion, advection, oxidation, and root effects on methane and oxygen transport through landfill green covers. Root characteristics, including architecture, gas conductivity, depth, and density, were found to be influential parameters on methane oxidation and emission in vegetated covers. For example, at 0.4-m root depth, exponential versus uniform root distribution yields a 0.1221 difference in methane concentration for a root density of 105 m/m3. Roots with 3x10-5 m air/m root gas conductivity achieved 13.3% methane oxidation efficiency. Increasing root depth and density extended the aerobic zone, but CH4 oxidation efficiency declined beyond the root density of 104 m/m3. We showed that vegetation cover elevates methane emission control, potentially meeting emission standards [e.g., carbon farming initiative (CFI)] with root densities exceeding 104 m/m3. The balance between atmospheric oxygen and soil methane affects oxidation, with higher air transport (lambda=3x10-4 m air/m root) resulting in 1.8% less methane oxidized. Overall, root-methane dynamics analysis should be optimized for efficient methane mitigation and control through landfill green cover systems.
Keyword ：
Analytical model Analytical model Landfill Landfill Methane Methane Oxidation Oxidation Vegetated covers Vegetated covers
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Xie, Haijian , Chen, Xiaobin , Shi, Yanghui et al. Methane Dynamics in Landfill Vegetated Covers: Steady-State Model for Oxidation and Diffusion [J]. | JOURNAL OF ENVIRONMENTAL ENGINEERING , 2025 , 151 (1) . |
| MLA | Xie, Haijian et al. "Methane Dynamics in Landfill Vegetated Covers: Steady-State Model for Oxidation and Diffusion" . | JOURNAL OF ENVIRONMENTAL ENGINEERING 151 . 1 (2025) . |
| APA | Xie, Haijian , Chen, Xiaobin , Shi, Yanghui , Rajabi, Hamid , Yan, Huaxiang . Methane Dynamics in Landfill Vegetated Covers: Steady-State Model for Oxidation and Diffusion . | JOURNAL OF ENVIRONMENTAL ENGINEERING , 2025 , 151 (1) . |
| Export to | NoteExpress RIS BibTex |
Version ：
Abstract ：
Streamflow forecasting using interpretable machine learning methods (MLs) for exploring runoff processes has received a lot of attention. However, exploring multi-step ahead daily streamflow forecasting considering antecedent streamflow as an input for various interpretable MLs is very limited. Thus, three interpretable MLs for daily streamflow forecasting in the Huaihe River basin of China during 2002-2020, including eXtreme Gradient Boosting (XGBoost), long short-term memory neural network (LSTM) and convolutional neural network (CNN) with SHapley Additive exPlanations (SHAP) method, were implemented to study the role of potential controlling factors, including antecedent streamflow, soil moisture and vegetation growth, in runoff processes at lead times of 0-6 days. The forecasting performances decreased with lead times. Specifically, the LSTM model performed best at lead times of 0-3 days, followed by CNN and XGBoost. CNN was superior to LSTM and XGBoost models when the lead time was greater than 3 days. The optimal forecasting performances were 0.71-0.97, 311.45-674.27 m3/s, 0.84-0.97 and 0.75-0.97 according to Nash-Sutclife efficiency, root-mean-square error, correlation coefficient and Kling-Gupta efficiency, respectively. The interpretable results varied across different MLs and at different lead times. The antecedent streamflow consistently dominated the runoff processes, particularly in the LSTM and XGBoost models. However, the significant role of soil moisture at the depth of 28-100 cm and leaf area index for low vegetation gradually emerged with increased lead times for CNN models, even outranking the importance of antecedent streamflow. Furthermore, the interpretability demonstrated by the optimal machine learning models was validated through the infiltration model and uncertainty analysis. Overall, interpretable machine learning has great potential to enhance our understanding of basin-scale runoff processes.
Keyword ：
CNN CNN infiltration model infiltration model leaf area index leaf area index SHAP SHAP soil moisture soil moisture
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Hao, Ruonan , Yan, Huaxiang . Towards Interpreting Machine-Learning Models for Multi-Step Ahead Daily Streamflow Forecasting [J]. | HYDROLOGICAL PROCESSES , 2025 , 39 (5) . |
| MLA | Hao, Ruonan et al. "Towards Interpreting Machine-Learning Models for Multi-Step Ahead Daily Streamflow Forecasting" . | HYDROLOGICAL PROCESSES 39 . 5 (2025) . |
| APA | Hao, Ruonan , Yan, Huaxiang . Towards Interpreting Machine-Learning Models for Multi-Step Ahead Daily Streamflow Forecasting . | HYDROLOGICAL PROCESSES , 2025 , 39 (5) . |
| Export to | NoteExpress RIS BibTex |
Version ：
Abstract ：
The pollution from landfills due to the leakage of leachate is an important source of groundwater contamination. The service life of geomembrane and high-permeability leachate collection system, which play a crucial role in the long-term effectiveness of landfill liner systems, can be greatly shortened due to the complex environmental conditions of landfills. The one-dimensional analytical model of contaminant transport in geomembrane and compacted clay composite liners considering the service life of geomembrane and leachate collection system is presented. Influences of the service life of geomembrane on contaminants transport are described by changing boundary conditions. Effects of the service life of leachate collection system are achieved by the fluctuated leachate head. An investigation into the influence of geomembrane and leachate collection system service life on the breakthrough of the composite liner is presented. An empirical formula for the prediction of breakthrough time considering the service life of geomembrane and leachate collection system is proposed, which may provide the reference for the preliminary design of composite liners. The proposed solution can capture the field observed data well. Both the total flux and concentration are underestimated by about three orders of magnitude and 47.5%, respectively, compared to the model that doesn't consider the service life of geomembrane.
Keyword ：
Analytical Model Analytical Model Breakthrough Time Breakthrough Time Composite Liner Composite Liner Contaminant Transport Contaminant Transport Leachate Collection System Leachate Collection System Service Life Service Life
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Xie, Haijian , Cai, Peifu , Yan, Huaxiang et al. Analytical Model for Contaminant Transport in Composite Liners Considering the Longevity of Barrier Components [J]. | WATER AIR AND SOIL POLLUTION , 2025 , 236 (1) . |
| MLA | Xie, Haijian et al. "Analytical Model for Contaminant Transport in Composite Liners Considering the Longevity of Barrier Components" . | WATER AIR AND SOIL POLLUTION 236 . 1 (2025) . |
| APA | Xie, Haijian , Cai, Peifu , Yan, Huaxiang , Ding, Hao , Li, Congcong . Analytical Model for Contaminant Transport in Composite Liners Considering the Longevity of Barrier Components . | WATER AIR AND SOIL POLLUTION , 2025 , 236 (1) . |
| Export to | NoteExpress RIS BibTex |
Version ：
Abstract ：
A novel bond-based nonlocal fluid transport model is introduced to tackle fluid flow in saturated porous media characterized by anisotropic and heterogeneous permeability. This model is built upon the bond-based framework and utilizes a type of Gaussian kernel function with truncation, incorporating the coefficient matrix within the covariance matrix. It is crucial to highlight that the permeability exerts a profound influence on the size and shape of the influence region after truncation. As a result, in cases of strong heterogeneity, the calculation area can become excessively large, posing challenges to effective computation. To confront this difficulty, we introduce a reconstructed bond-based nonlocal fluid transport model that dynamically adjusts based on permeability, allowing it to accommodate a wider range of scenarios. Meanwhile, we have proved that the proposed operator convergence to the local fluid transport operator in weak form. Moreover, a fully implicit algorithm, integrated with the Newton-Raphson method, is utilized to tackle the complex nonlinear issues arising in saturated porous media characterized by anisotropic and heterogeneous permeability. The novel bond-based model surpasses traditional bond-based model by enhancing fluid transport simulation in saturated porous media with strongly heterogeneous permeability. Additionally, unlike non-ordinary state-based model, the proposed model eliminates the need for complex penalty methods to address zero-energy modes, significantly reducing computational demands and time, as demonstrated by further validation. The numerical example exhibits strong agreement with COMSOL Multiphysics, confirming the accuracy of the model and its capability to effectively capture pressure discontinuities along material interfaces and crack surfaces in saturated porous media characterized by anisotropic and strong heterogeneous permeability.
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Wang, Xiaofang , Ren, Yongqiang , Liu, Xiaojuan et al. A novel bond-based nonlocal fluid transport model for anisotropic and heterogeneous saturated porous media [J]. | PHYSICS OF FLUIDS , 2025 , 37 (4) . |
| MLA | Wang, Xiaofang et al. "A novel bond-based nonlocal fluid transport model for anisotropic and heterogeneous saturated porous media" . | PHYSICS OF FLUIDS 37 . 4 (2025) . |
| APA | Wang, Xiaofang , Ren, Yongqiang , Liu, Xiaojuan , Yan, Huaxiang , Guo, Xu , Tian, Hao . A novel bond-based nonlocal fluid transport model for anisotropic and heterogeneous saturated porous media . | PHYSICS OF FLUIDS , 2025 , 37 (4) . |
| Export to | NoteExpress RIS BibTex |
Version ：
Abstract ：
The leachate collection system (LCS) is an important component of the barrier system of landfills. LCS in China is subjected to serious clogging due to the more degradable organics and water in the municipal solid wastes (MSWs). To evaluate the service life of LCS, a reactive transport model is developed to simulate the biogeochemical clogging in LCS. The hydrolysis reactions of degradable components and the kinetic calcium leaching process are taken into account to calculate the generation of VFAs and Ca2+ in MSW. The ionization equilibrium of volatile fatty acids (VFAs), dissolution equilibrium of calcium carbonate, and the kinetic biodegradation reactions of VFAs are considered to simulate the pH variation, calcium carbonate precipitation, and biofilm growth during clogging. By comparing with the laboratory experiment data, the proposed numerical model shows the ability to accurately predict the decrease of the porosity in LCS. Parameter analysis indicates that the decrease of the mass fraction of degradable components in MSW, leachate irrigation rate, and calcium ion leaching rate can significantly extend the service life of LCS. The proposed reactive transport model can be the methodological support for the design and service life prediction of leachate collection systems in landfills.
Keyword ：
Clogging Clogging Groundwater pollution Groundwater pollution Landfill Landfill Leachate collection system Leachate collection system Reactive transport modeling Reactive transport modeling
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Cai, Peifu , Xie, Haijian , Yan, Huaxiang . Reactive transport modeling of clogging in landfill leachate collection system [J]. | COMPUTERS AND GEOTECHNICS , 2025 , 180 . |
| MLA | Cai, Peifu et al. "Reactive transport modeling of clogging in landfill leachate collection system" . | COMPUTERS AND GEOTECHNICS 180 (2025) . |
| APA | Cai, Peifu , Xie, Haijian , Yan, Huaxiang . Reactive transport modeling of clogging in landfill leachate collection system . | COMPUTERS AND GEOTECHNICS , 2025 , 180 . |
| Export to | NoteExpress RIS BibTex |
Version ：
Abstract ：
Geopolymer is an environmentally friendly material with fast setting time, high early strength, and low cost. It shows promise as a sustainable alternative to traditional cement-based grouting materials. This study proposed an alternative grouting material using a graphene oxide (GO) reinforced fly ash (FA) and ground granulated blast furnace slag (GGBS)-based geopolymer. This study employs the central composite design (CCD) method within response surface methodology (RSM) to design an optimal mix proportion for the geopolymer, considering the content of fly ash in the precursor, the content of graphene oxide, the alkali activator modulus, and the alkali content as influencing factors. The effects of these four factors and their interactions on the fluidity, initial/final setting time, and compressive strength at different curing ages of geopolymer are discussed. Microstructural analysis (XRD, SEM) is conducted to illustrate the mechanism underlying the strength enhancement of this grouting material. The results indicate that RSMCCD can accurately optimize the mix proportion of geopolymer. Considering both the strength development and workability of the slurry, the optimal proportion was determined to be 20 wt% fly ash content, 0.027 % graphene oxide content, an alkali content of 7, and a modulus of 1.2. Under these conditions, the 28day compressive strength can reach 80.41 MPa, which represents a 19.52 % increase compared to the group without GO. Under the influence of an activator with a moderate modulus and alkali equivalent, the synergistic effect of fly ash and graphene oxide (GOFA) can effectively improve the fluidity and setting time of the slurry, facilitating the formation of a well-structured, dense, and mechanically robust spatial structure in the geopolymer grouting material. The optimal proportion proposed in this study can serve as a basis and reference for the engineering application of geopolymer grouting materials.
Keyword ：
Compressive strength Compressive strength Fluidity Fluidity Geopolymer Geopolymer Graphene oxide Graphene oxide Response surface methodology Response surface methodology Setting time Setting time
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Yan, Geng-ming , Yan, Xuan , Yan, Hua-xiang et al. Optimization and performance study of graphene oxide reinforced geopolymer [J]. | JOURNAL OF BUILDING ENGINEERING , 2025 , 104 . |
| MLA | Yan, Geng-ming et al. "Optimization and performance study of graphene oxide reinforced geopolymer" . | JOURNAL OF BUILDING ENGINEERING 104 (2025) . |
| APA | Yan, Geng-ming , Yan, Xuan , Yan, Hua-xiang , Wang, Hao . Optimization and performance study of graphene oxide reinforced geopolymer . | JOURNAL OF BUILDING ENGINEERING , 2025 , 104 . |
| Export to | NoteExpress RIS BibTex |
Version ：
Abstract ：
Per- and polyfluoroalkyl substances (PFAS) can persist and continuously affect the environment because of their innate thermal and chemical stability. The cut-off wall has emerged as a new and promising technology for pollution control at contaminated sites. This paper aims to investigate the migration of perfluorooctanesulfonic acid (PFOS) and perfluorooctanoic acid (PFOA) in a cut-off wall, aquifer and aquitard triple-domain system based on numerical simulation. The impacts of the PFAS concentration distribution, nonlinear and rate-limited adsorption and cut-off wall type are considered. The results show that the cut-off wall adsorption coefficient (Kdc) has the most considerable effect on system performance. Direct breakthrough rather than back-diffusion is the dominant failure mode when the Kdc values for PFOS and PFOA are lower than 15.4 mL/g and 7.8 mL/g, respectively. The GCL-enhanced cut-off wall (GCLW) is more suitable for installation than the composite GMB cut-off wall (GMBW) when the hole radius exceeds 1 m. Additionally, the GMBW is more effective at reducing the peak contaminant concentration than the GCLW when the head loss is > 1.9 m. This study may provide a scientific basis for the selection, installation and maintenance of cut-off walls under different conditions at PFAS contaminated sites. © 2025 Elsevier B.V.
Keyword ：
Bioremediation Bioremediation Emission control Emission control Environmental management Environmental management Fume control Fume control Groundwater pollution Groundwater pollution Smoke abatement Smoke abatement
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Shi, Yanghui , Yan, Xuan , Wang, Qiao et al. Insights into the migration behaviours of PFOS and PFOA in a cut-off wall-aquifer-aquitard triple-domain system [J]. | Journal of Hazardous Materials , 2025 , 494 . |
| MLA | Shi, Yanghui et al. "Insights into the migration behaviours of PFOS and PFOA in a cut-off wall-aquifer-aquitard triple-domain system" . | Journal of Hazardous Materials 494 (2025) . |
| APA | Shi, Yanghui , Yan, Xuan , Wang, Qiao , Wu, Jiawei , Yan, Huaxiang . Insights into the migration behaviours of PFOS and PFOA in a cut-off wall-aquifer-aquitard triple-domain system . | Journal of Hazardous Materials , 2025 , 494 . |
| Export to | NoteExpress RIS BibTex |
Version ：
Abstract ：
Transport processes in the subsurface are strongly influenced by the heterogeneity of soil. Understanding the non-Fickian behavior of solute transport in such environments is critically important for the accurate prediction of the spatial and temporal distribution of mass. Traditional local continuum models (e.g., classical differential equation-based approaches) encounter inherent limitations when dealing with strong heterogeneities, fractures, and other discontinuous structures due to their reliance on spatial derivative continuity assumptions. This study develops a peridynamic non-Fickian transport model to consider the non-Fickian and non-local effects simultaneously. The model is formulated in the framework of bond-based peridynamic (PD) by introducing the concept of dual phase lag (DPL) effects, including flux lag tau J quantifying inertial collision delays from pore structure irregularities and storage lag tau C reflecting interfacial adsorption-desorption effects, to provide an alternative numerical framework for addressing these complexities. The developed dual-phase lag peridynamic (DPL-PD) framework is validated against the analytical solution. The effects of phase lag and heterogeneity were discussed. A series of case studies, including solute transport in layered soil, heterogeneous soil, and porous media with discontinuity, demonstrate the capacity of DPL-PD model to capture the non-Fickian and non-local transport of solute in heterogeneous and discontinuous porous media. Furthermore, these cases quantitatively assess the influence of permeable and impermeable inclusions, as well as fractures, on solute transport. The results show that the developed dual-phase lag peridynamic framework can offer an alternative to classical local formulations for investigating non-Fickian and non-local transport in media with physically realistic microstructures.
Keyword ：
Dual-phase lag Dual-phase lag non-Fickian transport non-Fickian transport Peridynamics Peridynamics Porous media Porous media
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Yan, Huaxiang , Yan, Xuan , Zhang, Yunzhao et al. A dual-phase-lag peridynamic modeling framework for non-Fickian transport in heterogeneous porous media [J]. | COMPUTERS AND GEOTECHNICS , 2025 , 187 . |
| MLA | Yan, Huaxiang et al. "A dual-phase-lag peridynamic modeling framework for non-Fickian transport in heterogeneous porous media" . | COMPUTERS AND GEOTECHNICS 187 (2025) . |
| APA | Yan, Huaxiang , Yan, Xuan , Zhang, Yunzhao , Xiong, Qingrong , Xie, Haijian . A dual-phase-lag peridynamic modeling framework for non-Fickian transport in heterogeneous porous media . | COMPUTERS AND GEOTECHNICS , 2025 , 187 . |
| Export to | NoteExpress RIS BibTex |
Version ：
Abstract ：
Understanding of heat and mass transfer in fractured porous media is vital for the effective analysis and management of subsurface systems. We have developed a transient analytical model that incorporates advection, diffusion, degradation, and adsorption processes of organic contaminants in fractured porous media under nonisothermal conditions. The solution is obtained through Laplace inversion. The analytical model is validated using experimental data, field test, and numerical solution. We investigate the influence of various factors, including thermal properties, flow conditions, and fracture characteristics on organic contaminants transport in fractured porous media. Our findings show that when the temperature at the inlet exceeds the initial temperature of the matrix, contaminant transport into the matrix is enhanced due to the thermal gradient. In contrast, contaminant transport in the fractures is comparatively impeded. For example, the contaminant flux for the case with a temperature difference (Delta T) of -15 K at the fracture outlet is 1.8 times greater than that observed at Delta T = 20 K. Accurate prediction of contaminant transport requires consideration of non-isothermal diffusion, especially in the case involving elevated ST and |Delta T|. The contaminant flux at the fracture outlet for the case with Delta T = 20 K is 68.24 % of the value without considering thermal diffusion effects. Increasing the adsorption capacity of the matrix (Rm) reduces the diffusive mass into the matrix from the fracture, while an increase in half-life of organic contaminant (t1/2,m) significantly increases the mass flux at the outlet. Increasing t1/2,m from 1 year to 200 years results in a rise of the outlet flux by factors of 82.3 and 70.4 for the case with Rm = 10 and Rm = 80, respectively. When the fracture aperture reaches a threshold value (e.g., 7 mm), the mass transfer at the interface between the fracture and matrix becomes negligible compared to the dominant flow within the fracture.
Keyword ：
Analytical solution Analytical solution Fractured porous media Fractured porous media Organic contaminant Organic contaminant Thermal diffusion Thermal diffusion Transport Transport
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Ding, Hao , Wang, Jianqi , Zhang, Yunzhao et al. Analytical model for transient transport of organic contaminants in non-isothermal fractured porous media☆ [J]. | COMPUTERS AND GEOTECHNICS , 2025 , 187 . |
| MLA | Ding, Hao et al. "Analytical model for transient transport of organic contaminants in non-isothermal fractured porous media☆" . | COMPUTERS AND GEOTECHNICS 187 (2025) . |
| APA | Ding, Hao , Wang, Jianqi , Zhang, Yunzhao , Yan, Huaxiang . Analytical model for transient transport of organic contaminants in non-isothermal fractured porous media☆ . | COMPUTERS AND GEOTECHNICS , 2025 , 187 . |
| Export to | NoteExpress RIS BibTex |
Version ：
Abstract ：
Weathered soil, as the primary source material in granite-like binary-structure slopes, plays a critical role in slope stability. Understanding its internal erosion characteristics is essential for elucidating the failure modes and sliding mechanisms of granite slopes. Under groundwater seepage, internal erosion in weathered granite soil involves processes such as fine particle migration and clogging. In this study, model tests and numerical simulations were conducted to investigate particle migration by examining particle velocity, displacement, loss, and changes in porosity within the seepage zone. The results reveal the evolutionary process of internal erosion in weathered granite soil and the multi-scale transport behaviour of fine particles. Under seepage, fine particles migrated through pore spaces between the particle skeletons. When obstructed by the skeletal framework or bedrock surface, particle movement slowed, leading to siltation and clogging. During seepage, the rate of particle loss decreased progressively over time. The greatest loss occurred within the first hour, with over 90% of the migrating particles consisting of clay and fine sand (0.25 mm <= d). Particle displacement originated in structurally weaker regions of the soil, and the erosion extent expanded as seepage continued. The migration of soil particles altered the internal structure, affecting both porosity and permeability. This study provides new insights into the mechanisms of internal erosion in weathered granite soil, providing a theoretical basis for predicting slope instability and mitigating geohazards.
Keyword ：
Dynamic water head Dynamic water head Internal erosion Internal erosion Particle migration Particle migration Weathered granite soil Weathered granite soil
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Wang, Hao , Yan, Geng-ming , Dou, Hong-qiang et al. Experimental-Numerical Analysis of Particle Migration and Internal Erosion in Weathered Granite Soils [J]. | GEOTECHNICAL AND GEOLOGICAL ENGINEERING , 2025 , 43 (8) . |
| MLA | Wang, Hao et al. "Experimental-Numerical Analysis of Particle Migration and Internal Erosion in Weathered Granite Soils" . | GEOTECHNICAL AND GEOLOGICAL ENGINEERING 43 . 8 (2025) . |
| APA | Wang, Hao , Yan, Geng-ming , Dou, Hong-qiang , Xia, Chuan-an , Yan, Hua-xiang . Experimental-Numerical Analysis of Particle Migration and Internal Erosion in Weathered Granite Soils . | GEOTECHNICAL AND GEOLOGICAL ENGINEERING , 2025 , 43 (8) . |
| Export to | NoteExpress RIS BibTex |
Version ：
Export
| Results： |
Selected to |
| Format： |
