Research And Application Of Optimal Allocation Model Of Yehe Irrigation District Based On Uncertainty

As a major water conservancy project and one of the six irrigation districts in Shijiazhuang’s history,the Yehe Irrigation District plays a pivotal role in Shijiazhuang’s agricultural development.However,there are many uncertain factors in the allocation of water resources in the region,such as irrigation water requirements,hydrometeorology,available water,crop growth parameters and decision makers’preferences,etc,and management issues are particularly prominent.Therefore,considering the actual situation of the irrigation area,under the condition of ensuring the safety of water quality,a multi-scale agricultural water resource optimization model under uncertain conditions has been established.The main research contents and conclusions are as follows:1.The fuzzy comprehensive evaluation method is used to evaluate the water quality of Gangnan Reservoir section in Yehe Irrigation District.This method combines the weights of various water quality factors with the over-standard method to calculate the weights of various water quality factors,and then based on the principle of maximum membership degree,the water quality of Gangnan Reservoir section from 2014 to 2016 is obtained as the Class I standard.This result has certain reference significance for the water quality management of Gangnan Reservoir,and also shows that the available water in the irrigation area is in a safe state.2.Construct an interval nonlinear programming model.The model allocates limited water resources to Jingxing County,Pingshan County,Luquan District and Yuanshi County in the irrigation area from the perspective of local farmers under the conditions of safe water quality and fairness in the irrigation area,and obtains a limited total amount of water.Optimized total water allocation results for winter wheat,summer corn,and cotton in the four regions,and optimized water allocation results for various growth stages of various crops in the four regions.At the same time,the optimized system revenue increased by0.3×10~7yuan in 2013,the optimized system revenue increased by 12.4×10~7yuan in 2014,and the optimized system revenue increased by 5.4×10~7yuan in2015.Therefore,this model can rationally allocate agricultural water resources for local farmers,thereby increasing regional economic benefits.3.Construct a two-level fractional planning model.By coordinating the opinions of decision makers at the upper and lower levels,the model achieves the best irrigation water utilization rate under the condition of meeting the grain demand of the sub-irrigation area,and also obtains the best planting plan that meets the sustainable development of the region.After optimization,the benefit of Jingxing County increased by 0.98×10~6yuan,the benefit of Pingshan County increased by 1.44×10~7yuan,the benefit of Luquan District increased by 2.159×10~7yuan,and the benefit of Yuanshi County increased by 1.542×10~8yuan.The overall benefit has increased by 1.911×10~8yuan,and the economic benefit has increased significantly.