Water Resource Allocation In The Kaidu Kongque River Basin Based On The Joint Application Of "Reservoir Sluice River Lake"

The disharmony between the spatiotemporal distribution of water resources and regional socio-economic development seriously restricts social stability and sustainable development,especially in arid areas with high water scarcity.As a key carrier of water resource allocation,water conservancy projects need to combine water resource allocation an d regulation to enhance the supply capacity and guarantee level of water resources.This paper takes the Kaidu Kongque River basin,an important source of the Tarim River,as the research object,calculates the "three generation" water demand of the basin,determines the calculation formula of the water loss of the river channel,builds the complex nonlinear joint optimal operation model of"reservoir gate river lake" and the spatial equilibrium allocation model of water resources,evaluates the rationality and effectiveness of the water resources allocation model,and analyzes the causes of regional and departmental water shortage rates,And explore the correlation between flow nodes and river losses.On this basis,taking Chemical oxygen demand（COD）,a typical pollutant that affects the water quality of the basin,as the key factor,a multi-objective allocation model of water resources considering pollutant discharge is established to reveal the impact relationship between social benefits and ecological environmental benefits,analyze the composition and change of pollutant sources,and determine the areas seriously polluted.The main research content and achievements are as follows:（1）Based on data such as runoff,meteorology,and statistical yearbooks,the water demand for the "Three Lives" in the Kaidu Kongque River Basin is calculated.The total water demand for the current year 2020 and the planned year 2030 are 2436.92 million m³ and 2048.07 million m³,respectively;In order to accurately calculate the water loss of the river channel in arid areas,the water inflow of the previous month and the current month of the control section with high correlation with river loss was selected as the independent variable.A binary regression equation was established for the water inflow and river loss of 7 river sections in the basin.Taking the Tashidian Kongque River First Diversion Hub section as an example,the calculation formula for the water loss of the river channel was y=0.121x₁+0.199x₂-0.072x₂²-0.126.（2）The reservoir,gate dam,river and lake are jointly used to construct the joint optimal operation model of the complex nonlinear system of "reservoir gate river lake" with the minimum total water shortage rate representing social benefits as the operation goal;Based on the discount coefficient of water demand for each department,the proportion of theoretical water supply satisfaction between departments under water supply disruption is obtained.The deviation degree between actual water supply and theoretical water supply is used as the allocation equilibrium degree,and the maximum equilibrium degree is used as the objective function to construct a water resource spatial equilibrium allocation model.（3）By analyzing the results of water balance process,supply and demand balance,and water regulation process of Bosten Lake in the current and planning years,the rationality and effectiveness of the above models are evaluated,the causes of regional and departmental water shortage rates are analyzed,and the correlation between flow nodes and river losses is further discussed.The results indicate that the water resource allocation plan based on the joint application of "reservoir gate river lake" in the Kaidu Kongque River Basin can efficiently utilize water resources,reasonably coordinate the relationship between regional water resource endowment and consumption,and shorten regional differences.The maximum water shortage rate differences between regions in 2020 and 2030 are 4.51%and 1.07%,respectively.At the same time,to alleviate the contradiction between irrigation water and ecological water use,and to improve the level of water supply,the ecological water shortage rates in 2020 and 2030 are 32.96%and 19.24%respectively.（4）Under a long series of scenarios with different levels of years,the relationship between social benefits and ecological environmental benefits was revealed.The monthly average total water shortage rate in 2020 and 2030 increased from 16.5%to 17%,and the corresponding total COD emissions decreased by 0.15%and 0.32%,respectively.