The Study On Groundwater Numerical Simulation And Groundwater Resources Evaluation Of The Area Along The Yellow River In Henan Province

Henan province is located in China's center, that is a big agricultural province, the industry foundation is weak, parts of which the agricultural water extraction has only close to or exceed the amount of groundwater, Water scarcity became the important factors restricting economic development. In recent years, the turnoff situation of the Yellow River becomes increasingly serious, which has a direct threat of the water supply security such as Puyang, Kaifeng, Xinxiang, Zhengzhou city in Henan province. The sustainable development and utilization of water resources has become a very important factor to realize the sustainable development of Henan province. In order to solve the water resources crisis of the cities along the Yellow River and make full use of the Yellow River water resources, Henan province plans to build ten city reserve groundwater resource areas in locations along the Yellow River of which water-hearing capability is better.In accordance to the project of"Reserve Groundwater Source Area Census of Cities along the Yellow River"which is implemented by the Henan Geological Survey Institute, this paper comprehensively collected the groundwater exploration materials of region along the Yellow River, and comprehensively analyzed the geology and hydrogeology conditions of the urban groundwater resource area along the Yellow River, then a regional groundwater flow simulation model of the shallow aquifer along the Yellow River was constructed by using software GMS with data from 1999 to 2009. The results indicate that: Under the current conditions, the amount of annual average recharge resources accounts for 29.32×10~8m~3/a; The main sources of shallow groundwater system of region along the Yellow River are rainfall recharge, fishpond leakage, infiltration recharge of irrigation, the seepage of the Yellow river and canal leakage, which account for 96.26% of total recharge; Meanwhile, the major sink of shallow groundwater system of region along the Yellow River is artificial withdrawal, which includes fishpond water, agricultural water, industrial and living water, that take up 70.60% of total discharge of shallow groundwater system.On the basis of regional model, the hydrogeology conditions of ten city reserve groundwater resource areas were specifically analyzed, and the hydrogeology parameters within the scope of each source were refined, then the local groundwater flow prediction model of the shallow aquifer of each source was constructed with boundary conditions offered by the regional model and data from 2010 to 2029. Model predicted results show that: Under the condition in planning, the volumes of groundwater withdrawal are 170.55×10~4m~3/d, its main composition comes from the seepage of the Yellow River, which accounts for 71.18%. Substantially extracted for 20 years, the level of each groundwater resource area is gradually declined and comes to a steady state, and the water-level drawdown in funnel center is all less than 10m, the extraction of design of each groundwater resource area could be satisfied.On the basis of local model, the particle tracking model of each groundwater resource was constructed, and then the hydraulic capture zones of exploited wells with the date of 100 days and 1000 days were computed by using reverse tracking method under the condition of stable water level. Finally, the groundwater wellhead protection zones were divided into three levels: The first-class, the second-class and the quasi-protection area.