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Northwest A&F University (2017)

Optimum Allocation of Water Resources Based on Ecological Health in Arid Oasis Area

钟锋;

Titre : Optimum Allocation of Water Resources Based on Ecological Health in Arid Oasis Area

Auteur :

Grade : Master’s Theses 2017

Université : Northwest A&F University

Résumé partiel
The middle reaches of the Heihe River are located in the inland arid area of the northwest,and the water resources are seriously scarce.The sustainable development of the area is highly dependent on and sensitive to water resouces.In recent years,with the increasingly prominent contradiction between water supply and demand,agricultural water seriously squeeze the ecological water,leading to the growth of social and economic benefits and heavy ecological environment costs born.The research on water resources optimal allocation based on ecological health is of great theoretical and practical significance to promote the sustainable utilization of water resources and improve the fragile ecological environment in the middle reaches of the Heihe River.Based on the analysis of the evolution of ecosystem and the driving factors in the middle reaches of the Heihe River,this paper established an index system to measure the ecological health of oasis.Based on the principle of water and energy balance,and sandstorm dynamics,the appropriate oasis scale,ecological scale and cultivated land scale were determined.The available water resources in the study area were calculated for different hydrological years,and vegetation and wetland was calculated by using the method of diving evaporation and water evaporation,while the water demand of the living conditions,industry and agriculture were calculated by the quota method.Considering the uncertainty of upstream water,precipitation,evaporation,crop yield and price,based on the hierarchical analysis of large-scale system,a multi-objective interval two-layer optimized water distribution model based on ecological health was established.Based on MATLAB programming,the optimal allocation of water resources between counties,departments and crops in different planning years and different hydrological years was obtained.The main conclusions are as follows :(1)Based on the anomalous percentage of runoff,five kinds hydrological years was divided,especially high flow year,high flow year,normal flow year,low flow year,and especially low flow year,respectively.According to the " Water Distribution Scheme of Heihe River Mainstream ",the available water resources in five kinds hydrological years are [14.65,15.68],[14.77,15.25],[14.38,15.33],[14.40,14.70],[13.77,14.25] ×108 m3,respectively,of which groundwater allowed to use was 4.81×108 m3.(2)Based on the land use map of 1986,2000 and 2011 in the middle reaches of Heihe River,the evolution trends and reasons of forest land,grassland and wetland area were analyzed.The results showed that the area of forest land and grassland decreased from 1986 to 2011,while the wetland area decreased first and then increased.The main reasons for these changes were that the cultivated area occupied the ecological area,the production water squeezed ecological water use,the implementation of water engineering construction and wetland restoration measures,etc.(3)Considering the influence-factors of oasis ecosystem,the index system of oasis ecological health was determined,including suitable oasis scale,suitable cultivated land area,suitable ecological scale,suitable ecological groundwater level and minimum ecological water requirement protection.Based on the principle of water and energy balance,and sandstorm dynamics,the appropriate oasis scale,

Mots clés : ecological health; water resources allocation; ecosystem evolution; interval planning; middle reaches of the Heihe mainstream basin;

Présentation (CNKI)

Page publiée le 30 janvier 2018