Study On Water Source Allocation Scheme Of Groundwater Supply In Huaibei City

Karst water is the main source of water supply in the urban area of Huaibei City,and most of the water used for urban development and residents' living comes from karst water.Due to the long-term exploitation of groundwater,according to statistics,the water level of karst water in the urban area of Huaibei has dropped by 34.8m,forming a large dropping funnel centered on a power plant.The area of the dropping funnel is280km2.In order to realize the scientific and rational development and utilization of groundwater resources,ensure the water supply capacity of groundwater,and make limited groundwater resources play the largest role in the social development and economic construction of Huaibei City,this paper takes the water source area of Huaibei City as an example to collect Based on the data of terrain,geomorphology,hydrogeology and regional geology,the Visual MODFLOW software was used to establish a numerical model of groundwater flow in the Huaibei area.Taking the regional groundwater management requirements as constraints,the optimization plan for the exploitation of karst water mining wells in the central urban area was proposed.Make reasonable allocation planning for regional water resources.According to statistics,the existing karst water mining wells in the urban area of Huaibei City are all located in the restricted mining area,with a total mining volume of242,000 m~3/d,of which mainly for urban residents' domestic water,with an annual water intake of 185,000 m~3/d;the remaining mining volume is The annual water consumption of industrial water is 57,000 m~3/d.Combining the urban water demand and groundwater management requirements in the restricted-recovery area,this article takes pressure extraction-water source replacement as the adjustment idea to meet the current demand for water consumption in the central urban area,and replaces the municipal domestic water in the restricted-recovery area with the Xulou water source,while industrial The water is selected to be replaced by shallow pore water to control the over-exploitation of deep groundwater in the restricted mining area as a whole and improve the continuous decline of the karst water level in the region.This article follows the adjustment idea of pressure recovery-water source replacement to meet the current water demand in the central urban area,restricts the over-extraction of karst water in the restricted production area,and takes the water level,impact effect and applicability of the scheme in the restricted production area The analysis is a comparison and selection factor.The layout and production of karst watermining wells in the study area were adjusted.With the shallow pore water,three karst water mining schemes were drawn up.The established groundwater flow numerical model was used for simulation calculations.The results were analyzed and evaluated,and the optimal mining plan was determined,that is54.5% of the karst water production in the restricted mining area was pressure-recovered,and the water volume in the Xulou water source was completely replaced with the pressure recovery in the restricted mining area.The 57,000 m~3/d of karst water produced in the well preparation was replaced with shallow pore water.After this adjustment,the karst water production in the restricted mining area is 110,000 m~3/d,and the mining production outside the restricted mining area is 7.5 m~3/d.