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Impact of the Yalong-Yellow River water transfer project on the eco-environment in Yalong River basin

Science China(Technological Sciences) 2013年第4期56卷 831-842页

作者： WANG LingHe yan denghua WANG Hao YIN Jun BAI YinBaoLiGao School of Hydraulic Engineering Dalian University of Technology Department of Water Resources China Institute of Water Resources and Hydropower Research State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin China Institute of Water Resources and Hydropower Research Department of Hydraulic Research China Institute of Water Resources and Hydropower Research

The planning Yalong-River water transfer project will transfer 5.65 billion cubic meters water from the Yalong River into the Yellow River per *** Yalong River will be dramatically impacted hydrologically and ecologically because more than 60% of the runoff will be *** ecohydrological model was used to evaluate the impacts of the project on river corridor and wetland in this *** is a typical plateau river species and was used as the indicator species for assessment of the impact of water transfer *** model simulated the habitat area of Schizothorax in the reach between the Reba Dam and the Ganzi Hydrology Station on the Yalong *** Reba Dam,A'an Dam and Renda Dam will be constructed in the Yalong River for enhancing the water level for water diversion into the Yellow *** velocity,channel width,runoff,and water depth will be reduced due to the water transfer,especially during flood *** reduction in the velocity,channel width,runoff and water depth will occur mainly in the reach near the three dams and the reduction will be reduced to a minimum level in a distance about 100 km downstream of the *** maximum net water loss of Kasha Lake is only 1197200 m3,only 0.3% of runoff flowing into the *** project cannot bring adverse effect on the *** habitat area of Schizothorax in the Yalong River might be reduced if the water was transferred from the Reba *** habitat area of this species will be reduced more than 40%.

关键词： eco-environment water transfer project impact physical habitat modeling habitat area Yalong River

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Effects of Elevated CO_2 and Drought on Plant Physiology, Soil Carbon and Soil Enzyme Activities

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Pedosphere 2017年第5期27卷 846-855页

作者： WANG Yuhui yan denghua WANG Junfeng DING Yi SONG Xinshan College of Environmental Science and Engineering Donghua University China Institute of Water Resources and Hydropower Research

Global climate models have indicated high probability of drought occurrences in the coming future decades due to the impacts of climate change caused by a mass release of CO2. Thus, climate change regarding elevated ambient CO2 and drought may consequently affect the growth of crops. In this study, plant physiology, soil carbon, and soil enzyme activities were measured to investigate the impacts of elevated C02 and drought stress on a Stagn[c Anthrosol planted with soybean （Glycine ma,z）. Treatments of two CO2 levels, three soil moisture levels, and two soil cover types were established. The results indicated that elevated CO2 and drought stress significantly affected plant physiology. The inhibition of plant physiology by drought stress was mediated via prompted photosynthesis and water use efficiency under elevated CO2 conditions. Elevated CO2 resulted in a longer retention time of dissolved organic carbon （DOC） in soil, probably by improving the soil water effectiveness for organic decomposition and mineralization. Drought stress significantly decreased C：N ratio and microbial biomass carbon （MBC）, but the interactive effects of drought stress and CO2 on them were not significant. Elevated CO2 induced an increase in invertase and catalase activities through stimulated plant root exudation. These results suggested that drought stress had significant negative impacts on plant physiology, soil carbon, and soil enzyme activities, whereas elevated CO2 and plant physiological feedbacks indirectly ameliorated these impacts.

关键词： catalase drought stress invertase plant growth plant-soil-microbe system soil C:N ratio water use efficiency

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Multi-dimensional assessment of socioeconomic impacts of hydropower development—A case in the Upper Chuan River

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Science China(Technological Sciences) 2015年第7期58卷 1272-1279页

作者： LIU Yu MA Jing WANG Hao yan denghua LV YingKang DENG Wei Institute of Policy and Management Chinese Academy Sciences China Institute of Water Resources and Hydropower Research State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin College of Economics and Management China Agricultural University

The positive role of hydropower in climate change adaption is well accepted by the international community and has been highlighted many times,while the understanding of its impacts on socioeconomic development remains at the stage of rough estimation and qualitative *** application of a multi-regional CGE model in this paper provides an effective tool for quantitatively assessing the socioeconomic impacts of hydropower development,reflecting its positive *** case study on the Upper Chuan River details the steps of model development,including impact mechanism analysis,regional delimitation,macro closure setting,shock selection,and database *** results show the enormous economic benefits of hydropower development using various indicators such as consumption,investment,GDP,employment,and *** study indicates that hydropower development is a win-win energy development mode which can help to realize the integration of sustainable development and climate change ***,potential improvements to the model are discussed.

关键词： hydropower development socioeconomic impacts industrial development multi-regional CGE model Upper Chuan River

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Contributions of moisture sources to precipitation in the major drainage basins in the Tibetan Plateau

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Science China Earth Sciences 2022年第6期65卷 1088-1103页

作者： Ying LI Fengge SU Qiuhong TANG Hongkai GAO denghua yan Hui PENG Shangbin XIAO Engineering Research Center of Eco-environment in Three Gorges Reservoir Region Yichang 443002China College of Hydraulic and Environmental Engineering China Three Gorges UniversityYichang 443002China State Key Laboratory of Tibetan Plateau Earth System Resources and Environment(TPESRE)Institute of Tibetan Plateau ResearchChinese Academy of Sciences(CAS)Beijing 100101China University of Chinese Academy of Sciences Beijing 100101China CAS Center for Excellence in Tibetan Plateau Earth Sciences Beijing 100101China Key Laboratory of Water Cycle and Related Land Surface Process Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China Key Laboratory of Geographic Information Science(Ministry of Education of China) East China Normal UniversityShanghai 200241China State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin Water Resources DepartmentChina Institute of Water Resources and Hydropower ResearchBeijing 100038China

Tracking and quantifying the moisture sources of precipitation in different drainage basins in the Tibetan Plateau(TP)help to reveal basin-scale hydrological cycle characteristics under the interactions between the westerlies and Indian summer monsoon(ISM) systems and to improve our understanding on the mechanisms of water resource changes in the ‘Asian Water Tower' under climate changes. Based on a Eulerian moisture tracking model(WAM-2) and three atmospheric reanalysis products(ERA-I, MERRA-2, and JRA-55), the contributions of moisture sources to the precipitation in six major sub-basins in the TP were tracked during an approximately 35-year period(1979/1980–2015). The results showed that in the upper Indus(UI),upper Tarim River(UT), and Qaidam Basin(QB), the moisture sources mainly extended westward along the mid-latitude westerlies to the western part of the Eurasian continent. In contrast, in the Yarlung Zangbo River Basin(YB), inner TP(ITP), and the source area of three eastern rivers(TER, including the Nujiang River, Lancang River, and yangtze River), the moisture sources extended both westward and southward, but mainly southward along the ISM. In winter and spring, all of the sub-basins were dominated by western moisture sources. In summer, the western sources migrated northward with the zonal movement of the westerlies, and simultaneously the southern sources of the YB, ITP, and TER expanded largely toward the Indian Ocean along the ISM. In autumn, the moisture sources of the UI, UT, and QB shrank to the western sources, and the moisture sources of the YB, ITP, and TER shrank to the central-southern TP and the Indian subcontinent. By quantifying the moisture contributions from multiple sources, we found that the terrestrial moisture dominated in all of the sub-basins, particularly in the UT and QB(62–73%). The oceanic contributions were relatively high in the UI(38–42%) and YB(38–41%). In winter, evaporation from the large western water bodies(such as the M

关键词： Tibetan Plateau Precipitation Moisture sources Westerlies Indian summer monsoon Local recycling

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Modeling on Residence Time Distribution in Subsurface Flow Constructed Wetlands by Multi Flow Dispersion Model

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湿地科学 2010年第3期8卷 233-239页

作者： ZHANG Tao SONG Xinshan LU Shoubo yan denghua College of Environmental Science and Engineering Donghua UniversityShanghai 201620P.R.China China Institute of Water Resources and Hydropower Research Beijing 100044P.R.China

As an important design factor for constructed wetlands,hydraulic retention time and its distribution will affect the treatment *** injected sodium chloride tracers were used to obtain residence time distributions of the lab scale subsurface flow constructed *** the presence of trailing and multiple peaks of the tracer breakthrough curve,the multi flow dispersion model(MFDM)was used to fit the experimental tracer breakthrough *** to the residual sum of squares and comparison between the experimental values and simulated values of the tracer concentration,MFDM could fit the residence time distribution(RTD)curve satisfactorily,the results of which also reflected the layered structure of wetland cells,thus to give reference for application of MFDM to the same kind of subsurface flow constructed wetlands.

关键词： subsurface flow constructed wetlands tracer test residence time distribution multi flow dispersion model

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Changes of wetland landscape patterns in Dadu River catchment from 1985 to 2000, China

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Frontiers of Earth Science 2012年第3期6卷 237-249页

作者： Laibin HUANG Junhong BAI denghua yan Bin CHEN Rong XIAO Haifeng GAO State Key Laboratory of Water Environment Simulation School of Environment Beijing Normal University Beijing 100875 China China Institute of Water Resources and Hydropower Research Beijing 100044 China

Based on the interpretation and vector processing of remote sensing images in 1985 and 2000, the spatial changes of wetland landscape patterns in Dadu River catchment in the last two decades were studied using spatial analysis method. Supported by Apack soft-ware, the indices of wetland landscape pattern were calculated, and the information entropy （IE） was also introduced to show the changes of wetland landscape information. Results showed that wetland landscape in this region was characteristic of patch-corridor-matrix configuration and dominantly consisted of natural wetlands. Landscape patterns changed a little with low fragment and showed concentrated distribution with partial scattered distribution during the period from 1985 to 2000. The values of patch density and convergence index kept stable, and the values of diversity, evenness indices decrease, while dominance and and IE showed a slight fractal dimension indices were increased. All types of wetland landscapes had higher adjacency probabilities with grassland landscape in 1985 and 2000, and there was extremely weak hydrological link and large spatial gap among river, glacier, reservoir and pond wetlands due to low adjacency matrix values. Since their cumulative contribution exceeded 81% through the PCA analysis, the agriculture activities would be the main driving force to the landscape changes during the past 15 years.

关键词： wetland landscape spatial pattern landscape indices wetland management Dadu River catchment

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Amplification of Flood Risks by the Compound Effects of Precipitation and Storm Tides Under the Nonstationary Scenario in the Coastal City of Haikou,China

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International Journal of Disaster Risk Science 2022年第4期13卷 602-620页

作者： Hongshi Xu Xi Zhang Xinjian Guan Tianye Wang Chao Ma denghua yan Yellow River Laboratory Zhengzhou UniversityZhengzhou 450001China Institute of Hydropower and Hydroinformatics Dalian University of TechnologyDalian 116024China State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300350China China Institute of Water Resources and Hydropower Research Beijing 100038China

In the context of climate change,coastal cities are at increased risk of extreme precipitation and sea level rise,and their interaction will aggravate coastal *** the potential change of compound floods is valuable for flood risk *** this study,an integrated approach coupling the hydrological model and copulabased design of precipitation and storm tides was proposed to assess the compound flood risk in a coastal city—Haikou,*** copula model,most-likely weight function,and varying parameter distribution were used to obtain the combined design values of precipitation and storm tides under the nonstationary scenario,which were applied to the boundary conditions of the 1D-2D hydrological ***,the change of the bivariate return periods,design values,and compound flood risks of precipitation and storm tides were *** results show that the bivariate return period of precipitation and storm tides was reduced by an average of 34%under the nonstationary *** maximum inundation areas and volumes were increased by an average of 31.1%and 45.9%respectively in comparison with the stationary ***,we identified that the compound effects of precipitation and storm tides would have a greater influence on the flood risk when the bivariate return period is more than 50 years,and the peak time lag had a significant influence on the compound flood *** proposed framework is effective in the evaluation and prediction of flood risk in coastal cities,and the results provide some guidance for urban disaster prevention and mitigation.

关键词： Copula function Flood risk Haikou City Nonstationary scenario Urban hydrological model

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Evolution of drought and flood events on the Qinghai-Tibet Plateau and key issues for response

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Science China Earth Sciences 2023年第11期66卷 2514-2529页

作者： Jie LU Shu XU Tianling QIN Xin HE denghua yan Cheng ZHANG Sintayehu A.ABEBE State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin China Institute of Water Resources and Hydropower ResearchBeijing 100038China Yinshanbeilu National Field Research Station of Steppe Eco-hydrological System China Institute of Water Resources and Hydropower ResearchHohhot 010020China Hydraulic and Water Resources Engineering Department Debre Markos University Institute of TechnologyDebre Markos 999047Ethiopia

The Qinghai-Tibet Plateau is a climate-sensitive *** characteristics of drought and flood events in this region are significantly different as compared to other areas in the country,which could potentially induce a series of water security,ecological and environmental *** is urgent that innovative theories and methods for estimation of drought and flood disasters as well as their adaptive regulations are *** on extensive literature review,this paper identifies new situations of the evolution of drought and flood events on the Qinghai-Tibet Plateau,and analyzes the research progress in terms of monitoring and simulation,forecasting and early warning,risk prevention and emergency *** study found that there were problems such as insufficient integration of multi-source data,low accuracy of forecasting and early warning,unclear driving mechanisms of drought and flood disaster chains,and lack of targeted risk prevention and regulation *** this basis,future research priorities are proposed,and the possible research and development paths are elaborated,including the evolution law of drought and flood on the Qinghai-Tibet Plateau,the coincidence characteristics of drought and flood from the perspective of a water resources system,prediction and early warning of drought and flood coupled with numerical simulation and knowledge mining,identification of risk blocking points of drought and flood disaster chain and the adaptive ***,the paper will provide technical support for preventing flood and drought disasters,water resources protection,ecological restoration and climate change adaptation on the Qinghai-Tibet Plateau.

关键词： Drought and flood evolution Monitoring and simulation Prediction and early warning Risk prevention and emergency response Qinghai-Tibet Plateau

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Application of profile likelihood function to the uncertainty analysis of hydrometeorological extreme inference

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Science China(Technological Sciences) 2013年第12期56卷 3151-3160页

作者： LU Fan WANG Hao yan denghua ZHANG DongDong XIAO WeiHua State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin China Institute of Water Resources and Hydropower Research

Profile likelihood function is introduced to analyze the uncertainty of hydrometeorological extreme inference and the theory of estimating confidence intervals of the key parameters and quantiles of extreme value distribution by profile likelihood function is ***(generalized extreme value)distribution and GP(generalized Pareto)distribution are used respectively to fit the annual maximum daily flood discharge sample of the Yichang station in the yangtze River and the daily rainfall sample in10 big cities including *** parameters of the models are estimated by maximum likelihood method and the fitting results are tested by probability plot,quantile plot,return level plot and density *** return levels and confidence intervals of flood and rainstorm in different return periods are calculated by profile likelihood *** results show that the asymmetry of the profile likelihood function curve increases with the return period,which can reflect the effect of the length of sample series and return periods on confidence *** an effective tool for estimating confidence interval of the key parameters and quantiles of extreme value distribution,profile likelihood function can lead to a more accurate result and help to analyze the uncertainty of extreme values of hydrometeorology.

关键词： profile likelihood function extreme inference hydrometeorology uncertainty confidence interval

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What control the spatial patterns and predictions of runoff response over the contiguous USA?

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Journal of Geographical Sciences 2024年第7期34卷 1297-1322页

作者： JIANG Shanhu DU Shuping REN Liliang GONG Xinglong yan denghua YUAN Shanshui LIU Yi yanG Xiaoli XU Chongyu The National Key Laboratory of Water Disaster Prevention Hohai UniversityNanjing210098China College of Hydrology and Water Resources Hohai UniversityNanjing210098China School of Water Conservancy&Civil Engineering Northeast Agricultural UniversityHarbin150030China Department of Water Resources China Institute of Water Resources and Hydropower ResearchBeijing100038China Department of Geosciences University of OsloOsloNorway

Understanding the nonlinear relationship between hydrological response and key factors and the cause behind this relationship is vital for water resource management and earth system *** this study,we undertook several steps to explore the ***,we partitioned runoff response change(RRC)into multiple components associated with climate and catchment properties,and examined the spatial patterns and smoothness indicated by the Moran's Index of RRC across the contiguous United States(CONUS).Subsequently,we employed a machine learning model to predict RRC using catchment attribute predictors encompassing climate,topography,hydrology,soil,land use/cover,and ***,we identified the primary factors influencing RRC and quantified how these key factors control RRC by employing the accumulated local effect,which allows for the representation of not only dominant but also secondary ***,we explored the relationship between ecoregion patterns,climate gradients,and the distribution of RRC across *** findings indicate that:(1)RRC demonstrating significant connections between catchments tends to be well predicted by catchment attributes in space;(2)climate,hydrology,and topography emerge as the top three key attributes nonlinearly influencing the RRC patterns,with their second-order effects determining the heterogeneous patterns of RRC;and(3)local Moran's I signifies a collaborative relationship between the patterns of RRC and their spatial smoothness,climate space,and ecoregions.

关键词： hydrological response prediction machine learning accumulated local effect Moran’s Index large-sample study

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