| China, especially northern arid-semiarid region, suffers from water resources shortage. Situated at the Loess Plateau (Northern Shaanxi Province) and northeast Ordos Desert fringe, Shenfu Dongsheng coal mine is one of China's extra-large coal bases and boasts excellent mining conditions. However, with the rapid exploitation of coal mine and the annual increase of water consumption in coal mine drainage, industry, production and domestic use, this area witnesses sharp conflicts among mining industry, regional water supply and demand and environmental protection. Consequently, coordinated development between the economy, the society and the environments is seriously handicapped. Based on collection and analysis of the existing data, this paper adopts hydrogeological investigation, laboratory and in-situ tests and supplementary explorations as well as some methodologies such as theoretical analysis modeling and prediction to study coal mine area water resource distribution (including surface water, groundwater, mine water and coal mine domestic water), current situation and change trend of water supply in production, agriculture and industry. Then it evaluates the status development and utilization, evolution trend, exploitation and utilization potential of water resources in this area. Incorporated with the long and medium term development strategies of Shen-Dong coal mine, it layouts a scientific future allocation scheme of water resources in different hydrological years and proposes a planning mode of water resources development and utilization and a technical scheme for comprehensive water resources utilization so as to provide technical supports for the optimal allocation, rational exploitation, comprehensive utilization and scientific management of water resources.To determine hydrogeology parameters, this paper puts forward a set of new parameter inversion method, including selecting hydrogeology experimental parameters primarily, adjusting parameters for water level fitting and random structural assessment for spatial variability of sediments and this method was applied in the groundwater system numerical simulation of large and complicated mine successfully. There are three key steps of this method. Firstly, hydrogeology parameters of different borehole aquifers obtained from pumping tests are taken as representative hydrogeology parameters of those boreholes in divisional parameter aquifers. Then, groundwater level information obtained from the final simulating measurements is applied in order to adjust hydrogeology parameters. Finally, it studies spatial variations of hydrogeology parameters and evaluates influences of spatial correlation structures of sediments on permeability. To determine hydrogeology parameters, random statistical method and optimization theory are adopted.Dynamic grey model GM (1,1) was used to predicate the regional water demand, in which numerical simulation of unsaturated zone water migration was used to improve precipitation recharge coefficient precision, thus mining area water resource demand-supply balance analysis and water resource evaluation could be improved.Optimal allocation of the complex water resources can be achieved by multi objective programming model. According to the Shendong planning target, the principles should be obeyed in modeling development. Besides, Multi-objective, Multi water resources, Multi-users and different water quality planning objective function, decision variable, objective restriction and constraint condition are established. Optimized algorithm is achieved by the application of multi-objective optimizing function fgoalattain, which was introduced from MATLAB Optimization Toolbox. In this model, water resources are optimized according to benchmark of different hierarchal years, an optimal technical scheme for comprehensive utilization is put forward among different users. Thus, the target of lowest-cost and highest-supply of water resources is realized.Finally, the systematical theory and method for the optimal allocation of water resources and its comprehensive utilization in large and complicated coal mine area represented by Shenfu Dongsheng coal mine is formed. Namely, regional water supply and demand evaluation→underground water simulation and management→evaluation on the influences of mining→assessment and optimal allocation of water resources in large areas→comprehensive utilization of water resources. In a word, it is an all-round set of theoretical technology method combining systematical analysis and evaluation, simulation and management, optimal allocation and comprehensive utilization.
|
PDF Full Text Request