Impact On Regional Water Resources Of River Bank Filtration Along The Second Songhua River (Downstream Of Fengman Reservoir),China

With its rich and stable water quantity,good water quality,and easy access and management,river bank filtration(RBF)is widely adopted in many countries and has become an important means of groundwater exploitation.In order to demonstrate the amount of groundwater allowed in the river water source,it is necessary to consider the surface water,the water quality and water quantity of the groundwater,the degree of hydraulic connection between the groundwater and the surface water,and the environmental impact of the river water.Based on the second Songhua River basin(fullness below),the conceptual model and numerical simulation of hydrogeological geology in the study area are established based on the evaluation of the suitability of the second Songhua River and the tributaries of the Yinma River.Model,inversion of the regional hydrogeological parameters,completed the model identification and verification.Based on the groundwater numerical simulation model,based on the covariance relationship between groundwater exploitation and subsurface water level,considering the benefit of groundwater exploitation and environmental impact,the evaluation rate of different water precipitation in different rivers(20%,50%,75% and 95%).On this basis,the groundwater exploitation plan of the area suitable for water abstraction is designed,and the water resources of the adjacent river are estimated and analyzed.Influence,the following results and conclusions are obtained:(1)The second Songhua River mainstream area near the mining potential is huge.In the area of 5 rivers near the river water,in the 95% guarantee rate conditions,the groundwater to allow the exploitation of more than 2×104m3/d of the river water source has 4,more than 5×104m3/d of the river water source has 3 And the groundwater is allowed to have more than 10×104m3/d of litter water source.(2)Under the condition of the present year,the appropriate area of the nearby river mining area(near Wulai Street in Jilin City)and the suitable area(5)(near Songyuan City)are mainly composed of river water supply;However,when the guaranteed rate of precipitation is increased to more than 75%,the relationship between surface water and groundwater is changed in the appropriate area(near Jilin Longtan District).The relationship between surface water and groundwater is changed.(3)The effect of the suitable area on the groundwater flow field of the second Songhua River basin is not significant,and it does not change the overall flow of the groundwater flow in the area,but has a significant effect on the groundwater flow field in the appropriate area;(4)The amount of groundwater to the surface water is significantly reduced and the recharge of surface water to groundwater is increased compared with the condition of maintaining the present mining strength when the adjacent area is allowed to be exploited.When the guaranteed rate of atmospheric precipitation is low,the influence of coastal mining on the surface runoff of each section is relatively light.When the rate of precipitation is high,the influence of the mining on the surface runoff is obviously increased.