| Jinniushan Irrigation Area is located at the northeast of Liuhe District of Nanjing City. This area includes Yeshan town and Babaiqiao town and Jianghuai watershed passes through the northwest. Terrain is very complex within the scope of Jinniushan Irrigation Area. The typical landscapes mainly include low mountain relief, hills, hillocks and plain polder area. This area is prone to drought disaster due to its geographical location and climate factors (etc). Domestic water for people and livestock cannot be guaranteed at partial hillock area. Water deficient ratio is 23.9% for medium drought year (P=75%) based on the calculation and analysis results of current irrigation water supply and water requirement. Water peak period (June to August) of reservoir accounts for 70.6% of the total annual water consumption. Water deficient ratio is 74.1% in extreme drought year (P=95%) and the water peak period of reservoir (June to August) accounts for 61.6% of annual water consumption. There is a large gap of annual water requirement simply relies on local water resources for Jinniushan Irrigation Area. Resolution of water resources deficiency therefore must rely on joint scheduling of water resources.Reservoir in Jinniushan Irrigation Area can be recharged by way of water diversion from Changj iang River through Jinniu pumping station. The water transfer way is Babai Riverâ†' Jinniushan reserviorâ†'Jianshan pumping waterlineâ†'Zhaoqiao reservoir. It connects Jinniushan reservoir and some small reservoirs along the way, and water-carriage system in form of "long cane with fruits" comes into being. This water-carriage system supply water for northern hill area in drought year.The following research activities were conducted in the current study by considering the problems of water resources in the Jinniushan irrigation area:(1) Development of a reservoir joint optimization scheduling model for Jinniushan irrigation area.To develop a generalized reservoir by combining the five small reservoirs alone with the water transfer way, and to implement the joint scheduling of the generalized reservoir and Jinniushan reservoir. Replenishment in the case of water deficiency of this generalized reservoir can be carried out by way of pumping water from Jinniushan reservoir. A water resources optimal scheduling model was developed by considering the minimum cost of pumping water as the objective function. The constraint conditions are capacity of pumping station, reservoir storage capacity and water requirement, etc.(2) Solving of reservoir joint optimization scheduling model based on simulation and optimization methodThe water conservancy year is divided into 18 time-intervals according to the characteristics of water utilization in Jinniuyshan Irrigation Area. The ten days and one-month were taken as the time-interval for the water peak periods (June to August) take and other annual time, respectively. Based on the simulation of reservoir operation rule, pumping water, which depends on pumping water capacity of the pump station, is to be carried out in the case of time-interval lack of water in the reservoir. Method of dynamic programming optimization was used for optimization. And program of method of dynamic programming was developed by Fortran.(3) Comparison of the results of simulation and optimization methodsComparison of the results achieved by simulation method and optimization method was perofrmed for annual and each time-interval, respectively. The results indicated that 1) Compared with the simulation method, Annual pumping water for reservoir replenishment of 1.5 ×106 m3 from Jinniushan Reservoir was reduced by optimization method when P=95%; 2) Annual pumping water of 5 X 105 m3 can be reduced of the generalized reservoir when P=75%; 224,000 RMB can be saved from annual pumping water running costs.The research results of this study are expected to provide significant information method and method reference for practical water optimal scheduling for Jinnoushan Irrigation Area. |
PDF Full Text Request