Experimental Study On River Reservoir Formated By Rubber Dam,Its Recharge To Groundwater And Sustainable Water Resources Utilization In Nanyang City

The study focuses on calculation of reservoir storage capacity formated by a Rubber Dam in the Bei River and the reservoir recharge to groundwater nearby the river. Water transfer amount between surface water and groundwater is simulated by both water balance methods and groundwater dynamics based on observed river stages and groundwater levels. Groundwater variations and infiltration amount before and after dam formation were comparied, and its influence to city environment and groundwater exploration capacity was evaluated. Benefits of the dam to the socity, economy and environment in the area were further analyzed.Analysis results demonstrate that 38.56 million cubic meters reservoir water would infiltrate into groundwater, which amount is approximately 93.9 percent of current groundwater exporation amount in the shallow aquifer around the city. Available reservoir water supply amount in current dam operation processes considering both water supply and environmental protection is 113.78 million cubic meters, about 28 million cubic meters water is from the Yahekou reservoir in the upper river. Study results indicate that groundwater level significantly increases in the depression cone and depression area of the shallow groundwater in the city decreases.The study results show that the river rubber dam is an efficient hydraulic engineering project to increase water resources utilization, supply amount and groundwater storage. This project is very important for water resources sustainable utilization and economical development. Conjuctive utilization of surface water and groundwater through the dam project is able to reduce risk of water water shortage in this area and is used as reference for dam design in similar hydrogeological region as well.