The Research Of Model Of Irrigation And Drainage Dual-purpose Backbone Channel Optimization Of The Plain Area Of Heilongjiang Province

With the development of society, the increasing scarcity of land resources in our country, and Heilongjiang Province paddy field area was developing rapidly, in accordance with the previous irrigation and drainage principle of separation of the canal system layout, high water and high discharge, low water and low drainage, irrigation and drainage into a s et of systems, did not interfere with each other, most of the backbone of the channel covers an area was larger. In recent years for the modern agriculture in our country and the basic national conditions came into being a new model of irrigation and drainage dual channel mode, not only can bear the task of irrigation, drainage can also be carried out. The mode of irrigation and drainage dual-purpose backbone channel mode can reduce the project investment and save area, and can make full use of water resources, easy to manage, prevent secondary salinization, point out a new way for the development of the cause of China’s irrigation and drainage.This paper takes the Lindian irrigation area of Lindian County as the research object, research on the backbone channel mode, include irrigation and drainage separate mode, irrigation and drainage dual-purpose mode of trunk canal lifting Water, irrigation and drainage dual-purpose mode of branch canal lifting Water and calculates of flow, water level, section and engineering quantity. Establish the evaluation index system of the best backbone channel mode, including three criteria layer which contains engineering cost, construction management, ecological benefits. Closed to the ideal solutions for sorting method(TOPSIS) and projection pursuit model(PPC)respectively evaluate the model of backbone channel model, the main research contents and results are as follows:(1)Using the method of AHP to determine the index weight, using the model of TOPSIS to comprehensive evaluation of channel model, and then make full use of subjective ability to determine the weight, there was the use of objective data to arrange indicators. The result showed that the three indexes which effect the best model of channel were engineering inves tment, floor area and maintenance cost,water lifting of branch canal of dual-use irrigation and drainage was the best backbone mode, the irrigation and drainage separate mode was the worst backbone mode.(2) The entropy weight method was introduced to determine the weight of the index in the TOPSIS model. The entropy method is a mathematical method can objectively and effectively calculate the weights of the various indicators, so that the results obtain more real. The results showed that: irrigation and drainage dual-purpose mode of branch canal lifting water was the best mode backbone.Among all the influencing factors, management fees, project investment and land occupation were the main factors.(3) The PPC model was optimized by accelerating genetic algorithm(RAGA). The results were in agreement with the results of TOPSIS model. Irrigation and drainage dual-purpose mode of branch canal lifting water was the best. Water saving efficiency,project investment and land occupation of three indexes occupied the main position, the calculation process is more convenient.(4) By comparing analysis of the models, the model of TOPSIS and the model of PPC both can carry on the appraisal analysis to the channel model and obtained results were basically the same,the optimal mode was water lifting of branch canal of separating irrigation and drainage,water lifting of trunk canal of separating irrigation and drainage secondly,the mode of separating irrigation and drainage was the worst.