Study On The Influence Mechanism Of Yangqiao Town Riverside River Source On Regional Water Supply

At present,due to the poor surface water quality in northern anhui province,the main source of domestic and drinking water mainly relies on mining loose pore water for a long time.Due to the high mining intensity,land subsidence and other problems have emerged.According to the relevant results of the evaluation of groundwater over-exploitation areas in anhui province,the deep groundwater exploitation Wells in most present urban areas in northern anhui province are all in the restricted mining areas,that is,they belong to the restricted mining objects.Because the deep groundwater exploitation is limited and the surface water quality is poor,the shallow groundwater exploitation along the river is considered to replace the deep groundwater exploitation in the urban area.The exploitation of parihe-river headwaters replaces the exploitation of deep groundwater and improves a series of hazards caused by the decline of deep groundwater level in the region.At the same time,it can solve the problem of insufficient water supply for regional domestic use.Based on the water supply mechanism of the riverside river source area in yangqiao town,this paper establishes a numerical simulation model of groundwater in the study area,and identifies and verifies the model with reference to the hydrogeological parameters of the study area.Based on the numerical model of groundwater in the study area,based on the covariant relationship between the amount of exploitation in the parihe-river source area and the depth of groundwater level decline,the influence of the exploitation in the parihe-river source area on the conversion relationship between the region and local groundwater flow field,groundwater and surface water under the guarantee rate of 95% precipitation was analyzed.It also analyzes the influence of riparian mining on the runoff of quanhe river,and the conclusions are as follows:1.The mining potential of Quanhe River is huge.According to three different well layout methods,the riverside water source area is mined by 20,000 m3/d during the dry season;2.Before and after the exploitation of the water source near the river,the overall shape of the groundwater flow field in the study area did not change significantly,and the groundwater in the study area did not change in the overall flow direction.However,there are obvious changes to the local flow field in the short term.With the strengthening of the later supply,the local flow field gradually recovered and stabilized;3.Comparing the three well layout options in the riverside water source area,the impact degree of single row along the river bank,single row along the river bank,and double row along the river bank on the runoff in the dry season is 0.32% and 0.39,respectively.%,0.2%,the overall impact is small;4.According to the set mining plan,shallow groundwater is mined.The three methods of well layout all have a dropping funnel.The degree of recovery of the dropping funnel varies from the end of 10 years.The water level of the dropping funnel mined by two rows of staggered wells along the bank of the river is restored to the value closest to the original water level contour line;On the premise of water supply in yangqiao town,the riverside water source is further developed and utilized.Based on the analysis of the shallow groundwater level,the influence effect and the applicability of the scheme in the actual implementation of the scheme,the influence mechanism of the exploitation of the groundwater level and flow field in the region of the parihe-river source area was determined.