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eco-environment evolvement analysis of ertan reservoir catchment based on remote sensing

Science china(Technological Sciences) 2011年第S1期54卷 95-100页

作者： pang zhiguo ,ge dexiang & fu jun e state key laboratory of simulation and regulation of water cycle in river basin,,china institute of water resources and hydropower research,beijing 100048,china 1. state key laboratory of simulation and regulation of water cycle in river basin China Institute of Water Resources and Hydropower Research Beijing 100048 China

hydropower project may bring with it social-economic profits as well as side *** built dam and reservoir often cause some problems to the surrounding areas,among which the ecological and environmental effects caused by hydropower projects are always concerned by the *** this article,we take the ertan reservoir catchment as the research area and try to quantitatively analyze the variation of vegetation cover and soil erosion by remote sensing technique,and to comprehensively assess the evolvement and development trend of reservoir *** erosion,land use/cover are used as ecological and environmental indicators which reflect the changes before,after and in the period of the construction of ertan hydropower *** by the multi-source remote sensing data(from satellite Landsat and CBeRS) and DeM data,the land use/cover is interpreted through RS images which are classified both by unsupervised and supervised method,and the driving factors of the ecological changes are also *** the same time,the changes of soil loss are also monitored and analyzed during flood seasons of ertan reservoir area before and after reservoir impoundment(1995,2000 and 2005) using the revised universal soil loss equation(RUSLe) .The results show that during the recent 13 years the arable land area has decreased obviously,and construction area and water surface have increased *** increase of vegetation cover has some relations with the implementation of local ecological projects,i.e.,de-farming to forestry and de-farming to pasture *** the same time,changes may also be caused by the climate adjustment in the reservoir *** the ten years from 1995 to 2005,the high soil loss classes were transforming to lowly level classes *** of these show that the soil loss of ertan reservoir area is getting better.

关键词： ertan reservoir catchment eco-environment land use/cover soil loss remote sensing

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Agricultural drought vulnerability in the middle reaches of Yangtze river basin under environmental change

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Journal of earth Science 2024年

作者： Peng Yang Fei Xu jun Xia Jiang Li Libo Zhou Cai fu state key laboratory of Hydroscience and engineering， Tsinghua University School of geography and Information engineering， china University of geosciences Information Center of Department of Natural resources of Hubei Province School of water resources and hydropower engineering， Wuhan University Wuhan C-geo Clouds Science and Tech Co.， Ltd

Climate change and economic development impact the population expansion and water shortage in the middle reaches of the Yangtze river basin (MYRB)， leading directly to drought aggravation-expansion and impacting agricultural production in the MYRB. Therefore， this study quantitatively evaluated agricultural drought vulnerability in the MYRB based on the variable fuzzy evaluation model (VFeM). The main conclusions are as follows: (1) The arable land in the MYRB gradually decreased between 2005 and 2020， whereas the forest cover decreased and then increased; (2) precipitation and evapotranspiration were the key factors affecting the agricultural drought vulnerability (e.g.， weights of 0.24 and 0.21)， whereas arable land density and gross domestic product (GDP) per capita played less significant roles; and (3) the agricultural drought vulnerability in the MYRB during 2005–2020 was mainly at level 3 and below， with higher drought vulnerability in the western and northern regions， which had a higher drought risk potential.

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ecological health analysis of wetlands in the middle reaches of Yangtze river under changing environment

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International Journal of Digital earth 2023年第1期16卷 3125-3144页

作者： Shengqing Zhang Xiaoyan Zhai Peng Yang jun Xia Sheng Hu Libo Zhou Cai fu Hubei key laboratory of Regional ecology and environmental Change School of Geography and Information EngineeringChina University of GeosciencesWuhanPeople’s Republic of China state key laboratory of simulation and regulation of water cycle in river basin Research Center on Flood and Drought Disaster ReductionChina Institute of Water Resources and Hydropower ResearchBeijingPeople’s Republic of China state key laboratory of water resources and hydropower engineering Science Wuhan UniversityWuhanPeople’s Republic of China Yangtze Valley water environment Monitoring Center WuhanPeople’s Republic of China Wuhan Cgeo Clouds Science&Tech Co.Ltd WuhanPeople’s Republic of China

Changes in wetland ecosystems have a critical impact on the local ecology and species *** development scenarios and policies are key factors influencing their ***,we studied changes of wetlands in the middle Yangtze river basin(MYRB)in 2001-2020,and a patch-generated land use simulation(PLUS)model and random forest(RF)method were applied to predict and analyze the changes under different scenarios in the MYRB in the future(i.e.2035-2095).The results indicated that:(1)The regions with high wetland proportions were concentrated in the central and eastern MYRB in 2001-2020,with a 1.5%decrease in overall wetland area;(2)The RF could simulate the future ecological quality with training and testing accuracies of 0.98 and 0.92,respectively;(3)Remote Sensing ecological Index(RSeI)less than 0.5 in the central and eastern regions and 13.3%reduction in the northwest in the SSP245 *** general,the study provides a basis for future regional studies of ecosystem quality and provides data to support wetland conservation and management.

关键词： Remote sensing machine learning ecological prediction ecological change Yangtze river basin

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