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Xi’an University of Technology (西安理工大学) 2015

The Respone Mechanism of Water Environment Change to Climate Variations in the Tipical Inland Lake of Arid Area

郭梦京

Titre : The Respone Mechanism of Water Environment Change to Climate Variations in the Tipical Inland Lake of Arid Area

Auteur : 郭梦京

Grade : Doctoral Dissertation 2015

Université : Xi’an University of Technology (西安理工大学)

Résumé partiel
Lake is the sensitive area of global environmental change,and also typical research area of climate change research.In arid regions,inland lake,as sensitive indicator of climate change,has direct and significant impact on ecological and environmental change.Bosten Lake is located in the arid region,which once was the largest inland freshwater lake in China.However,in the past decades,the impacts of climate change and human activities lead to lake surface shrink,water reduction,water pollution and water salinization,which consequently deteriorate the ecological environment of the Bosten Lake.In the perspective of hydrological and ecological point,nearly 50 years of hydrological and meteorological observations and the recent water quality monitoring data were used to analyze the variation of the hydro-climatic factors,changes of water environment as well as impacts of climatic variability on the lake by utilizing hydro-meteorological,environmental and other related theories.The means of GIS spatial analysis,wavelet analysis,water balance model,climate resilient models and other tools were used in this paper to analyze these variations.The results showed that :(1)Bosten Lake,was original a freshwater lake,has evolved into oligosaline lake.Before 1958 the lake salinity was only 0.39 g/L and it increased to 1.44 g/L by 1975.In 1987 the value peaked at 1.87g/L and the current salinity is 1.55 g/L.There are significant differences in the spatial distribution of the lake.The highest value of salinity appeared in northwestern lake,while the lowest value in the southwest.(2)The water balance of the Bosten Lake is determined by the Kaidu River inflow,Kongque River outflow and evaporation loss.Approximately 93%of the total water input to the lake comes via the Kaidu River,with a small fraction of water input coming from precipitation(3%).The lake outflow via the Kongque River and evaporation from the lake accounted for 57%and 43%of the total water output from Bosten Lake,respectively.

Mots clés : Arid area ;Bosten Lake ;Climate change ;Human activity ;Characteristics of water environment ;Ecological healt ;

Présentation (CNKI)

Page publiée le 10 avril 2022