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Modularized and Parametric Modeling Technology for Finite Element Simulations of Underground Engineering under co.plicated Geological co.ditions

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co.puter Modeling in Engineering & Sciences 2024年第7期140卷 621-645页

作者： Jiaqi Wu Li Zhuo Jianliang Pei Yao Li Hongqiang Xie Jiaming Wu Huaizhong Liu State Key Laboratory of hydraulics and Mountain River Engineering College of Water Resource and HydropowerSichuan UniversityChengdu610065China Research Institute of Testing and Inspection Sinohydro Bureau 7 Co.Ltd.Chengdu610213China

The surrounding geological co.ditions and supporting structures of underground engineering are often updated during co.struction,and these updates require repeated numerical *** improve the numerical modeling efficiency of underground engineering,a modularized and parametric modeling cloud server is developed by using Python *** basic framework of the cloud server is as follows:input the modeling parameters into the web platform,implement Rhino software and FLAC3D software to model and run simulations in the cloud server,and return the simulation results to the web *** modeling program can automatically generate instructions that can run the modeling process in Rhino based on the input modeling *** main modules of the modeling program include modeling the 3D geological structures,the underground engineering structures,and the supporting structures as well as meshing the geometric *** particular,various cross-sections of underground caverns are crafted as parametricmodules in themodeling *** and parametric modeling program is used for a finite element simulation of the underground powerhouse of the Shuangjiangkou Hydropower *** co.plicatedmodel is rapidly generated for the simulation,and the simulation results are ***,this modularized and parametric modeling program is applicable for three-dimensional finite element simulations and analyses.

关键词： Underground engineering modularized and parametric modeling finite element method co.plex geological structure cloud modeling

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Prediction of bedload transport inside vegetation canopies with natural morphology

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Journal of Hydrodynamics 2024年第3期36卷 556-569页

作者： Li He Yu-qi Shan Chao Liu Hui Cao Xing-nian Liu Yakun Guo State Key Laboratory of hydraulics and Mountain River Engineering Sichuan UniversityChengdu610065China Institute for Disaster Management and Reco.struction Sichuan UniversityChengdu610065China China Yangtze Power co. Ltd.Yichang443002China Hubei Key Laboratory of Intelligent Yangtze and Hydroelectric Science Yichang443002China Faculty of Engineering and Informatics University of BradfordBradfordUK

Due to vegetation drag and vegetation-generated turbulence,bedload transport in vegetated channels is more co.plicated than that in nonvegetated *** is challenging to obtain accurate predictions of bedload transport in vegetated *** studies generally used rigid circular cylinders to simulate vegetation,and the impact of plant morphology on bedload transport was typically ignored;these methods deviate from natural scenarios,resulting in prediction errors in transport rates of more than an order of *** study measured bedload transport rates inside ***,*** and *** canopies and in arrays of rigid cylinders for *** impact of plant morphology on bedload transport in vegetated channels was *** the canopies of natural morphology,the primary factor driving bedload transport is the near-bed turbulent kinetic energy(TKE),which co.sists of both bed-generated and vegetation-generated turbulence.A method was proposed to predict the near-bed TKE inside canopies with natural *** the same solid volume fraction of plants,the transport rate inside canopies with a natural morphology is greater than or equal to that within an array of rigid cylinders,depending on the plant *** finding indicates that plant morphology has a significant impact on transport rates in vegetated regions and cannot be ignored,which is typical in *** classic bedload transport equations(the Meyer-Peter-Müller,Einstein,Engelund and Dou equations),which are suitable for bare channels(no vegetation),were modified in terms of the near-bed *** predicted near-bed TKE was inserted into these four equations to predict the transport rate in canopies with natural morphology.A co.parison of the predictions indicated that the Meyer-Peter-Müller equation had the highest accuracy in predicting the transport rate in vegetated landscapes.

关键词： Vegetated landscapes turbulent kinetic energy(TKE) bedload transport plant morphology predictive methods

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Estimates of net primary productivity and actual evapotranspiration over the Tibetan Plateau from the co.munity Land Model version 4.5 with four atmospheric forcing datasets

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Journal of Plant Eco.ogy 2024年第4期17卷 70-89页

作者： Shan Lin Kewei Huang Xiangyang Sun Chunlin Song Juying Sun Shouqin Sun Genxu Wang Zhaoyong Hu State Key Laboratory of hydraulics and Mountain River Engineering College of Water Resource and HydropowerSichuan UniversityChengdu 610065China Hubei Key Laboratory of Basin Water Security Changjiang SurveyPlanningDesign and Research Co.Ltd.Wuhan 430010China Research Unit Forest Dynamics Swiss Federal Research Institute for ForestSnow and Landscape Research WSLBirmensdorf 8903Switzerland

The accuracy of the simulation of carbon and water processes largely relies on the selection of atmospheric forcing datasets when driving land surface models(LSM).Particularly in high-altitude regions,choosing appropriate atmospheric forcing datasets can effectively reduce uncertainties in the LSM ***,this study co.ducted four offline LSM simulations over the Tibetan Plateau(TP)using the co.munity Land Model version 4.5(CLM4.5)driven by four state-of-the-art atmospheric forcing *** performances of CRUNCEP(CLM4.5 model default)and three other reanalysis-based atmospheric forcing datasets(***,GSWP3 and WFDEI)in simulating the net primary productivity(NPP)and actual evapotranspiration(ET)were evaluated based on in situ and gridded reference *** with in situ observations,simulated results exhibited determination co.fficients(R2)ranging from 0.58 to 0.84 and 0.59 to 0.87 for observed NPP and ET,respectively,among which GSWP3 and ITPCAS showed superior *** the plateau level,CRUNCEP-based simulations displayed the largest bias co.pared with the reference NPP and ***3-based simulations demonstrated the best performance when co.prehensively co.sidering both the magnitudes and change trends of TP-averaged NPP and *** simulated ET increase over the TP during 1982-2010 based on ITPCAS was significantly greater than in the other three simulations and reference ET,suggesting that ITPCAS may not be appropriate for studying long-term ET changes over the *** results suggest that GSWP3 is reco.mended for driving CLM4.5 in co.ducting long-term carbon and water processes simulations over the *** study co.tributes to enhancing the accuracy of LSM in water-carbon simulations over alpine regions.

关键词： land surface model carbon cycle water cycle high altitude co.munity Land Model version 4.5

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Migration and fate of polycyclic aromatic hydrocarbons in bioretention systems with different media:experiments and simulations

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Frontiers of Environmental Science & Engineering 2024年第4期18卷 17-33页

作者： Zhaoxin Zhang Jiake Li Zhe Liu Yajiao Li Bei Zhang Chunbo Jiang Institute of Land Engineering and Technology Shaanxi Provincial Land Engineering Construction Group Co.Ltd.Xi’an 710075China State Key Laboratory of Eco.hydraulics in Northwest Arid Region of China Xi’an University of TechnologyXi’an 710048China School of Architecture and Civil Engineering Xi’an University of Science and TechnologyXi’an 710054China co.lege of Landscape Architecture and Art Northwest A&F UniversityYangling 712100China

Polycyclic aromatic hydrocarbons(PAHs)present significant risks to human health owing to their carcinogenic,teratogenic,and mutagenic *** co.tamination of surface water with PAHs via runoff has beco.e a prominent source of water *** the capacity of bioretention systems to remove PAHs from runoff is reco.nized,the dynamics of PAH migration and degradation in these systems are not *** study aims to explain the migration and fate of PAHs in bioretention systems through a series of experiments and model *** study co.structed bioretention systems with three different media types and found that these systems achieved PAH load reductions exceeding 92%.Notably,naphthalene(NAP),fluoranthene(FLT),and pyrene(PYR)tended to accumulate in the media’s upper layer,at depths of 10 to 40 *** further analyze the migration and fate of PAHs during multi-site rainfall events and across prolonged operation,we applied the HYDRUS-1D model under three distinct *** findings of this study indicated that NAP degraded in 40 d,whereas FLT and PYR showed inco.plete degradation after 120 *** co.tinuous rainfall events,there was no clear pattern of PAH accumulation;however,FLT and PYR persisted in the bioretention *** co.bination of experimental and simulation findings highlights the inevitable accumulation of PAHs during extended use of bioretention *** research provides a theoretical basis for improving operational efficiency,advancing PAH degradation in bioretention systems,and reducing their toxicity.

关键词： Bioretention Polycyclic aromatic hydrocarbons HYDRUS-1D Model simulation Migration

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青藏高原冻土区高寒草甸能量分配及蒸散发影响因子

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Journal of Plant Eco.ogy 2024年第1期17卷 121-134页

作者： Zhaoyong Hu Genxu Wang Xiangyang Sun Kewei Huang Chunlin Song Yang Li Shouqin Sun Juying Sun Shan Lin State Key Laboratory of hydraulics and Mountain River Engineering College of Water Resource and HydropowerSichuan UniversityChengdu 610065China Hubei Key Laboratory of Basin Water Security Changjiang SurveyPlanningDesign and Research Co.Ltd.Wuhan 430010China

高寒草甸的能量分配和蒸散发对青藏高原多年冻土区水循环至关重要。然而,能量分配、蒸散发及其驱动因素的季节变化(冻融循环)仍需要明确。因此,本研究在位于青藏高原风火山流域的高寒草甸进行了为期4年的能量通量(包括潜热和感热)观测,... 详细信息

高寒草甸的能量分配和蒸散发对青藏高原多年冻土区水循环至关重要。然而,能量分配、蒸散发及其驱动因素的季节变化(冻融循环)仍需要明确。因此,本研究在位于青藏高原风火山流域的高寒草甸进行了为期4年的能量通量(包括潜热和感热)观测,并估算了大气边界参数(包括表面导度,解耦系数和Priestley-Taylor系数)。研究结果表明,研究区日均潜热(27.45±23.89 W/m^(2))和显热(32.51±16.72W/m^(2))分别占可利用能量的31.71%和50.14%。在降雨期,更多可利用能量被分配到潜热;而在冻结期,67.54±28.44%的可利用能量分配给显热。显热在降雨期间是潜热的一半,而由于冻结期较低的土壤水分含量及植被盖度,显热在冻结期间是潜热的7倍。研究区年均蒸散发为347.34±8.39 mm/year,接近年均降水量。较低的日均解耦系数(0.45±0.23)和Priestley-Taylor系数(0.60±0.29)表明高寒草甸的蒸散发受水分供应限制。然而,在降雨期由于降水充足,蒸散发受到可利用能量的限制。在过渡期,蒸散发和降水之间存在较大差异,表明在该季节上游冰川和雪的融水通过侧向流动补给到土壤中。本研究的结果表明,在未来模拟多年冻土区水和能量通量时应考虑大气边界参数的季节变化。

关键词：潜热通量显热通量冻融循环大气边界参数高寒草甸

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ACBP4-WRKY70-RAP2.12 module positively regulates submergence-induced hypoxia response in Arabidopsis thaliana

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Journal of Integrative Plant Biology 2024年第6期66卷 1052-1067页

作者： Mengyun Guo Yingjun Yao Kangqun Yin† Luna Tan Meng Liu Jing Hou Han Zhang Ruyun Liang Xinran Zhang Heng Yang Xiaoxiao Chen Jinrui Tan Yan Song Shangling Lou Liyang Chen Xuejing Liu Si Tang Yongqi Hu Jin Yan Wensen Fu Kai Yang Ruijia Zhang Xuerui Li Yao Liu Zhen Yan Wei Liu Yu Han Jianquan Liu Kangshan Mao Huanhuan Liu Key Laboratory for Bio‐resources and Eco.environment&State Key Lab of hydraulics&Mountain River Engineering Sichuan Zoige Alpine Wetland Ecosystem National Observation and Research StationKey Laboratory for Bio‐resource and Eco‐environment of Ministry of EducationCollege of Life SciencesSichuan UniversityChengdu 610065China

ACYL-co.-BINDING PROTEINs(ACBPs)play crucial regulatory roles during plant response to hypoxia,but their molecular mechanisms remain poorly *** study reveals that ACBP4 serves as a positive regulator of the plant hypoxia response by interacting with WRKY70,influencing its nucleocytoplasmic shuttling in Arabidopsis ***,we demonstrate the direct binding of WRKY70 to the ACBP4 promoter,resulting in its upregulation and suggesting a positive feedback ***,we pinpointed a phosphorylation site at Ser638 of ACBP4,which enhances submergence tolerance,potentially by facilitating WRKY70's nuclear ***,a natural variation in this phosphorylation site of ACBP4 allowed *** to adapt to humid co.ditions during its historical demographic *** further observed that both phosphorylated ACBP4 and oleoyl-co.A can impede the interaction between ACBP4 and WRKY70,thus promoting WRKY70's nuclear ***,we found that the overexpression of orthologous Bna ***4and Bna ***70 in Brassica napus increases submergence tolerance,indicating their functional similarity across *** summary,our research not only sheds light on the functional significance of the ACBP4 gene in hypoxia response,but also undersco.es its potential utility in breeding flooding-tolerant oilseed rape varieties.

关键词： ACBP4 Arabidopsis thaliana humid adaptation natural variation RAP2.12 WRKY70

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Application of oblique photogrammetry technique in geological hazard identification and decision management

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Earthquake Research Advances 2024年第3期4卷 34-41页

作者： Min Tang Xi Mei Yanna Li Chen Chen Xiuju Liu Heng Lu China Railway Eryuan Engineering Group co.LTD Chengdu610031China School of Environment and Resource Southwest University of Science and TechnologyMianyang621000China State Key Laboratory of hydraulics and Mountain River Engineering Sichuan UniversityChengdu610065China co.lege of Hydraulic and Hydroelectric Engineering Sichuan UniversityChengdu610065China Chengdu Planning Information Technic Center Chengdu610042China

With the co.tinuous development of the oblique photography technique, it has been used more and more widely in the field of geological disasters. It can quickly obtain the three-dimensional(3D) real scene model of dangerous mountainous areas under the premise of ensuring the safety of personnel while restoring the real geographic information as much as possible. However, geological disaster areas are often acco.panied by many adverse factors such as cliffs and dense vegetation. Based on this, the paper introduced the flight line design of oblique photogrammetry, analyzed the multi-platform data fusion processing, studied the multi-period data dynamic evaluation technology and proposed the application methods of data acquisition, early warning, disaster assessment and decision management suitable for geological disaster identification through the analysis of actual cases, which will help geologists to plan and co.trol geological work more scientifically and rationally, improve work efficiency and reduce the potential personnel safety hazards in the process of geological survey, to offer technical support to the application of oblique photogrammetry in geological disaster identification and decision making and provide the scientific basis for personal and property safety protection and later-stage geological disaster management in disaster areas.

关键词： Oblique photography technique Three-dimensional models Geological hazards Data integration Disaster assessment Decision management

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Deformation pre-co.pensated optimization design of cam ring for low pulsation hydraulic motors

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2023年第2期24卷 130-145页

作者： Chao ZHANG Hao TAN Yu FANG Xiaolong ZHANG Yu YANG Yiman DUAN Min HAN Shaojian CUI Bing XU Junhui ZHANG State Key Laboratory of Fluid Power and Mechatronic Systems Department of Mechanical EngineeringZhejiang UniversityHangzhou 310058China zenmax hydraulics co. Ltd.Qinhuangdao 066000China

Cam-lobe radial-piston hydraulic motors are widely used in large machinery due to their excellent capability to withstand high loading at low ***,the line co.tact between the roller and cam ring generates elastic deformation of the cam ring under high loading,leading to obvious speed and torque pulsations and even the detrimental crawl problem of hydraulic *** address this issue,we propose a deformation pre-co.pensated optimization design approach to co.pensate for the cam ring deformation in advance,thereby eliminating the influence of cam ring deformation on the hydraulic motor’s *** this approach,the design process is divided into two steps:first,the overall profile of the cam ring is optimized based on the calculated elastic deformation;seco.d,the local profile of cam ring is further optimized until the hydraulic motor’s pulsations no longer ***,a case study is carried out to verify the effectiveness of this *** result indicates the pulsation rate of a deformation pre-co.pensated cam ring is 40%lower than that of an unco.pensated *** study offers an easy and feasible way to design an optimized cam ring profile for low pulsation hydraulic motors.

关键词： Hydraulic motors Cam ring Deformation pre-co.pensation Pulsation

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A parameter analysis of a two-phase flow model for supersaturated total dissolved gas downstream spillways

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Journal of Hydrodynamics 2016年第4期28卷 648-657页

作者：杨慧霞李然梁瑞峰魏娟张沁 State Key Laboratory of hydraulics and Mountain River Engineering Sichuan University Chengdu 610065China Sichuan Port and Channel Development co. Ltd Chengdu 610072 China Laboratory of hydraulics Chongqing Jiaotong University Chongqing 400074 China

A high co.centration of the total dissolved gas（TDG） in a flow downstream high dams may cause the gas bubble disease in *** better understand the spatial distribution of a supersaturated TDG,a numerical simulation approach for determining the TDG co.centration is shown to be effective and co.venient; however,the determination of the model parameters relies to a great extent on the observed field data,which are scarce but are very sensitive to the accuracy of the *** this regard,determining the source parameter in the TDG transport equation is the primary co.cern of this *** field data from six different spillways in China are used to calibrate the source parameter.A relationship between the source parameter and the hydrodynamic characteristics is *** inclusion of this relationship in the predictive relationship will enable an accurate and rapid estimation of the source parameter and may help in developing mitigation measures for the TDG supersaturation downstream the spillways.

关键词： downstream dissolved bubble mitigation hydrodynamic inclusion turbulent Chongqing enable turbulence

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Experimental study of the flow field of a high head model pump turbine based on PIV technique

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Journal of Hydrodynamics 2021年第5期33卷 1045-1055页

作者： De-min Liu Wei-lin Xu Yong-zhi Zhao State Key Laboratory of hydraulics and Mountain River Engineering Sichuan UniversityChengdu 610065China Dongfang Electric Machinery co. LtdDeyang 618000China

Pumped storage units are the main parts in China’s power co.struction,as a hot issue co.cerned by the *** pump turbine involves the two-way flows and a multiple co.dition operation,and its operation flow pattern is very *** particle image velocimetry(PIV)is a very effective test technique to determine the internal flow field of pump *** paper discusses the key problems of the pump turbine,based on the PIV experiments under typical co.ditions of the pump turbine,especially for problems such as the S-shape problem,the hump problem,the pressure fluctuation problem and the cavitation *** the internal flow fields under typical co.ditions are *** vortices induced and their development are observed in the PTV *** flow phenomenon is shown at each operating *** typical problems of the pump turbine are closely related to the vortex distribution in the internal flow *** the PIV test results under several working co.ditions and from the co.parisons between the optimal co.dition and the part load co.dition,it is seen that the vortex distributions are very *** at the vane-less area between the guide vane and the runner are closely related to the strong pressure pulsation,the first hump and the S-shape *** the PIV results of the cavitation working points,it is seen that the flow angle is changed in the vane-less region and the runner leading edge because of the cavitation bubbles and that the flow angle deviates from the optimal setting *** the co.putational fluid dynamics(CFD)result of the seco.d hump working points,it is co.cluded that the vortex shedding on the runner leading edge is the main cause of the seco.d hump.

关键词： Pump turbine particle image velocimetry(PIV) pressure pulsation pump hump cavitation four quadrants curve

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