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Northwestern University (2019)

Impact Assessment of Trans Water Project in Arid Area on Terrestrial Vegetation in Water Diversion Area

李影;

Titre : Impact Assessment of Trans Water Project in Arid Area on Terrestrial Vegetation in Water Diversion Area

Auteur : 李影;

Grade : Master’s Theses 2019

Université : Northwestern University

Résumé partiel
Arid area is an important part of terrestrial ecosystem.Due to the lack of rainfall and water resources,the ecosystem in arid areas of Northwest China is particularly fragile,which seriously restricts the healthy development of the ecological environment.In order to meet the needs of water in social production,life and ecological,people changed the uneven spatial and temporal distribution of water resources by building an inter-basin water transfer project.The influence of water diversion on the ecological environment is very complicated.Through the study at home and abroad water diversion project,the general effects of water transfer on terrestrial vegetation in arid regions have been summarized.This paper takes the Yinhajidang project as a case to predict the degree of influence of engineering water supply on the natural land vegetation of the Sugan Lake wetland in the lower reaches of the water transfer area.Sugan Lake wetland is an important ecological unit of the Qaidam Basin,which is the inland arid area,the natural vegetation plays an important role in maintaining the ecological function and protecting the ecological environment.From the perspective of protecting the wetland ecological environment in arid area,this study establish reasonable water diversion of the Yinhajidang project initially according to the effect of the Processing MODFLOW model on the area of the big Sugan Lake and the groundwater level of the wetland.According to the quantitative relationship of natural vegetation and the groundwater in arid area and on the basis of each water transfer scheme,this paper predicts the impact of the decline of groundwater level on natural vegetation type and area in wetland after water transfer for 5 years,10 years,20 years,30 years and 50 years.In addition,on the basis of the changes of vegetation stability,changes in vegetation biomass and wetland vegetation landscape were predicted and analyzed.(1)Considering the demand of water in Dunhuang basin and Sugan Lake,the initial set of water diversion scheme is 1.0×108m 3for wet year,and 0.8×108m 3for normal year,and 0.3×108m 3 for low water year.(2)After 50 years of different schemes of water diversion,the area of big Sugan Lake will not decrease by more than 8%,in addition to 0.4×108m 3for low flow year.

Mots clés : Arid area; Yinhajidang project; groundwater; Vegetation prediction; Sugan Lake wetland;

Présentation (CNKI)

Page publiée le 5 juin 2020