Research On The Design And Optimization Of Irrigation Project In Huoshilafu Township Of Shache County

Irrigation project planning is the premise and foundation of the entire agricultural development.In Xinjiang the spatial and temporal distribution of water resources is obviously different,and the backward operation and management of farmland irrigation have a deep impact on agricultural production.Departments at all levels have been making continuous efforts to improve the planning and management level of farmland water conservancy for many years,but there are still many problems to be solved.Therefore,it is extremely urgent to plan and design farmland water conservancy projects scientifically and rationally,establish relatively perfect irrigation facilities system,popularize water-saving transformation projects in irrigated areas,accelerate scientific and institutionalized management level.The irrigated areas of Huoshilafu township is extremely dry and rainless,with low cultivated soil fertility,high permeability coefficient,loss of ineffective evaporation and leakage seriously,backward irrigation methods and disordered irrigation and drainage system.Therefore,it is necessary to accelerate the improvement of the planning and design of irrigation.Taking the irrigation area of Huoshilafu township as the research object,the planning and optimization of two kinds irrigation projects in the irrigation area are studied in this paper.In the conventional irrigation engineering planning and design,the Tuanjie main canal is taken as the object to carry out the full-section impervious design of the canal.And the optimal water distribution model of canal system is established with the objective of minimizing the leakage loss of water conveyance.The optimal division scheme of channel rotation irrigation combination is obtained by solving the model in improved particle swarm optimization algorithm.In the planning and design of drip irrigation engineering,the decision-making model based on entropy weight-TOPSIS was used to optimize different design schemes of the sand settling basin.The main conclusions are as follows:(1)By establishing the optimal water distribution model of Tuanjie main canal system,it is concluded that when the inflow water of branch canal is 1.3m3/s,the branch canals under Tuanjie main canal are divided into two rotational irrigation groups.The water distribution results under three different water distribution scenarios show that the water distribution models established can obtain the wheel irrigation combination that meets the requirements of water delivery,and realize the centralized and stable water distribution process with less water delivery loss.(2)The decision-making model based on entropy weight-TOPSIS was used to make decisions on the three settling basin schemes,and the relative closeness degree of the three schemes was obtained as[0.2745,0.2964,0.4291].The final selection of the sand settling tank is the third option,that is the length of the pool is 34m,the depth of the pool is 2.2m,the slope is 1:1.5,the wide of bottom of the pool is 3m,the mouth of the pool is 9.6m wide,and the volume is 471.24m3.The results show that the evaluation model can clearly quantify the differences in economy,technology and ecological environment.The model has a good applicability in the decision making of the sand sink scheme.