Study On The Dynamic Optimal Allocation Mode Of Water Resources For The Coordinated Development Of Coal And Water In The Open Pit Combined Mining Area

With its unique multiple attributes,water resources affect and restrict the coordinated development of ecology,economy,resources and environment in large-scale coal industrial park.The large-scale open pit mining area(Industrial Park)has multiple water supply sources,multiple production units,multiple industrial types,various water requirements,complex drainage structure,uncoordinated spatial and temporal distribution of water supply and demand,different process levels of sewage treatment stations,incompatible monitoring equipment and software,and isolation of information are common,all of which directly affect the level of water resource allocation in the area,And then,it affects the efficient utilization of water resources.Based on the national key research and development project(2018YFC0406406),this paper takes Antaibao open pit mining area(Industrial Park)in Pingshuo,China coal as the research object,summarizes the current situation of water resources allocation at home and abroad,puts forward the concept of water resources dynamic allocation for the coordinated development of coal and water in the open pit mining area,analyzes the supply and demand characteristics and current situation of water resources in the research area,and constructs the coordinated development of coal and water Based on the model of water resources allocation,the core module program of model solution is compiled,and the optimal allocation scheme of water resources in the study area is obtained by using GAPSO algorithm,and its rationality is analyzed.The main conclusions are as follows:(1)The analysis of regional water supply and demand shows that in 2016-2019,the actual average annual water consumption of 13 water users in the study area was 11.224 million m³,and the actual annual average water supply of each water supply point reached 15.1131 million m³.The regional water supply was larger than the regional water demand,but there were unreasonable supply and demand structure and uneven distribution of water resources in the year.Because the water quality can not meet the high demand of water users,the scope of reuse is limited,and the efficient utilization of water resources can not be realized.(2)In terms of the improvement of the optimization algorithm,the benchmark function test results show that:the inertia weight factor?of PSO parameters adopts the nonlinear reduction mechanism of adaptive change and open-ended upward parabola;the learning factor c₁,c₂ adopts the strategy of asynchronous change of learning factor with the number of iterations,and integrates with genetic algorithm(GA).The hybrid algorithm with improved parameters still shows efficient optimization performance when dealing with complex space problems.It can effectively avoid the problems of low convergence accuracy and easy to fall into local optimization existing in standard particle swarm optimization.(3)Establishment and solution of water resource allocation model.For 9water supply points and 13 water users in the study area,117 variable regional water resource supply and demand allocation models are established.Six water resource allocation schemes with different assurance rates are obtained from the perspectives of water use and water supply.The results show that:under the premise of ensuring the water quality of water users,the regional water supply units mainly deal with the sewage treatment station of Anjialing terminal and the upper kiln area of Jinggong No.1 mine Station,treatment station in Taixi District of Jinggong No.1 Coal Mine and yellow water diversion are the main parts,accounting for 87.19%of the total water supply of the configuration scheme.(4)In terms of dynamic allocation of water resources,the boundary space of the model can be changed by constantly adjusting the limit values of water supply unit and water demand unit in the model.In the obtained allocation scheme,under the current production conditions and the guarantee rate of 120%to meet the minimum water demand of production water unit,the water resource allocation scheme is the best,and the sewage treatment station and well in Anjialing terminal are the best The upper kiln area and the Yellow River water from Gongyi coal mine play the main role in water supply.The total water supply of three water sources is 10.7288 million m³/a,accounting for 73.18%of the total water demand of the whole area.The utilization of reclaimed water accounts for 75.81%of the total allocation.The industrial production water demand of groundwater is 0.