Water Resources Optimal Allocation Based On Simulation Of Water Resources Transformation In Inland River Basin

Water resources shortage and ecological environment deterioration have become the critical factors that restrict the sustainable development of the economy in inland river basin in Northwest of China.It is harmonious relationship of society, economy and ecological environmen that is the key to establish a sustainable and harmonious society. With the development of society, tremendous changes have occurred in process of natural hydrological cycle because of water resources utilization. And natural hydrological cycle has changed into dualistic hydrological cycle under strong impacts of nature and human activities. Therefore, research of water resources allocation which based on simulation of water resources could reflect the reality of water utilization, and is benifital to solve water utilization conflict in inland river basin in China.Main studied content and conclusions of the thesis are achicved as flowing.(1) The thesis have analyzed the main methods of water usufruct, and optimized allocation principles are set out according to available water and net water requirement in different planning years .And water requirement per capita food are treated as constraint on lower bound, then the multiobjective optimal allocation model of water resources usufruct is established which included efficient and equitable objective and adopted multi-objective optimization method. Allocation results in view of transferred and self-production water are obtained. Allocation results are consistent when compared with"The major treatment planning of Shiyang River Basin"water allocation scheme with Liangzhou 7.26 billion m~3, Minqin 2.94 billion m~3,Gulang1.04 billion m~3,Tianzhu 0.14 billion m~3,Jinchuan2.11 billion m~3,Yongchang2.52 billion m~3,Sunan0.16 billion m~3.Liangzhou, Minqin,Jinchuan and Yongchang have been allocated more water usufruct due to requirement water of economy.(2) The inland river basin is divided into three independent subsystems according to hydraulic connection. An independent subsystem is divided into three primary calculated units of canal irrigation district, well irrigation district and mixed canal and well irrigation district according to the characteristic of water resources transformation and pattern of water utilization. Two models of water balance and BP artificial neural network were established to simulate inflow of well irrigation district and mixed canal and well irrigation district respectively.The accuracies of the two models are nice, and can be used to simulation of water resources transform in Shiyang river basin.(3) Water resources optimal allocation model have been established with the process of water resources transform based on dualistic hydrological cycle .Canal irrigation district, well irrigation district and mixed irrigation district are primary calculated units in a subsystem,and A primary calculated unit includes several irrigation districts (secondary calculated units).Two-layer optimal models of primary and secondary were established to allocate water resources between calculated units of primary and secondary respectively, with the objectives of maximum irrigation benefit and equity respectively.(4) The optimal water resources allocation results among primary calculated units were obtained by the solution of simulation optimizing though combing with the two simulation models, with domestic ,ecological ,secondary and tertiary industry water demand were satisfied firstly and meeting the water requirement for 420kg food per capita.The total gross water of dry, normal and wet years has reached 22.16 billion m~3, 22.14 billion m~3, 18.8 billion m~3 in 2015 respectively, and with ecological water is 8.2 percent, municipal is 5.2 percent , secondary and tertiary industry water is12.3percent and irrigational is 74.3percent in normal years.The total gross water of dry, normal and wet years has reached 22.49 billion m~3, 22.1 billion n m~3, 19.38 billion m~3 in 2025 respectively, and with ecological water is 8.9 percent, municipal is 6.1 percent , secondary and tertiary industry water is13.6 percent and irrigational is 71.4percent in normal years.(5) Nonlinear optimized model is established to allocate optimal allocation irrigation water in primary calculated unit to secondary calculated with the objective of equity water use.Secondary calculated units belong to different administrative districts, Therefore, allocation of water resources can be unified by integrating administrative districts and irrigation districts. And the water resources were allocated in administrative districts with Liangzhou is 10.67 billion n m~3,Minqin is 3.22 billion m~3,Gulang is 0.68 billion m~3,Jinchuan is 2.74 billion m~3 and Yunchang is 4.7 billion m~3 in 2015 of normal years, Liangzhou is 10.43 billion m~3,Minqin is 3.32 billion m~3,Gulang is 0.69 billion m~3,Jinchuan is 3.06 billion m~3 and Yunchang is 4.44 billion m~3 in 2025 of normal years.Water allocation of Liangzhou and Gulang decrease slightly which depend on agriculture, and Jinchuan increase fast which depends on industry from 2015 to 2025. Ecological water allocation of Minqin is higher than present to maintain ecological protection objects.