Multi—irrigated Water Sources Coordinated Control With Distributed Hyrodynamic Simulation In Jingxi Irrigation District

The water circulation process in irrigation district is extremely complex under the dual drive of strong human activity and natural factors.This papaer create a distributed simulation and optimization coupling model of irrigation district surface-groundwater.study space-time distribution evolution and optimization allocation of water resources in irrigation district,to collaborative schedul the surface and groundwater.This is important basis to realize the irrigation district water resources utilization and ecological environment harmonious.This paper study water transport and distribution,basin irrigation,soil saturated-unsaturated water evolution and groundwater uplift to ditch drainage process and water resources optimization in Jinxi irrigaion district in SanJiang Plan in HeiLongJiang province.The main research contents and conclusion are as follows:(1)Irrigation district distributed hydrological cycle simulation model was created based on the hydrodynamic calculation of,including the use of one dimensional grid form Saint Venant equations described the process of canal system,two-dimensional shallow water equations describe the process of border check surface water flow,movement of soil water distribution model to describe the soil infiltration process and two dimensional Boussinesq equation describing groundwater flow movement process,improved the fully implicit finite volume method,the coupling to simulate the irrigation water cycle process.(2)The multi—irrigated water sources optimal allocation model was builded,economic utility,ecological function and irrigation performance based multi-objective function,improve the Hicks optimization method,combining with chaos particle swarm optimization algorithm,realize the optimal allocation of irrigation water more.(3)The multi-irrigated water sources coordinated scheduling simulation-optimal coupling model was builded through fusing the multi—irrigated water sources optimal allocation model and the irrigation district distributed hydrological cycle simulation model.This model soved by using the MPI parallel computing technology.The surface-and groundwater utilization ratio during spring irrigation and flood season of Jinxi irrigation district was suggested,the process of irrigation water was optimized and Flood risk of irrigation area under flood season design rainstorm was analyzed(4)Combined surface-ground water scheduling scheme and flood season design flood season flooding risk in irrigation districts under heavy rainfall.During the spring irrigation period,the combined surface-groundwater dispatching districts are regional 46,regional 49,regional 50,regional 51,regional 64,regional 68,regional 69,regional 75 and regional 85.Groundwater is preferred in irrigation of jinxi irrigation district during flood season to lower the groundwater level and reduce the rise of canal water level caused by side seepage.In order to ensure the safety of canal system operation in case of heavy rain during irrigation.In jinxi irrigation district,the control districts of each branch canal shall be jointly regulated by surface-groundwater.The amount of groundwater pumped for irrigation is 0.74 million cubic meters to 3288 million cubic meters,respectively in district 9 and district 75.Consider time frequency of rainfall,rainfall and rainfall district three elements,three elements level set 1,3,and 3,respectively,using fully combination design method,9 were formed with simulated rainfall scenarios.The district where water accumulation is most likely to occur is the district of huama,and the maximum water accumulation days are 2 days,less than the flood tolerance days of crops,without waterlogging.Jinxi upstream districts meet design storm irrigation district,the need to open a day ahead of shanxi drainage drainage station,station,take the horse to kam drainage station and ShuangYuShu drainage station and so on four drainage pumping station,the canal water level dropped to drainage water level,the most prone to water district for the partition,the longest days water for 2 days,days less than crop resistance to flood and waterlog don't occur.Jinxi irrigation district downstream district,in case of design storm drainage station head drainage station and two Lin Lin to open one day in advance to canal system water level drop to drainage water level,the most easy seeper district for head Lin partition,the longest days water for 2 days,less than the flooded days resistant crops departed.