| Immersion is a typical geological problem of reservoir environment.Groundwater level has risen after reservoir was built and starting to impound water,which caused environmental geological problem surround the area. With theexperiment and lessons, the immersion has caused much attention.Located in the northwest side of Beijing, Yanqing new district is lie in theeastern of Yanhuai basin and closed to Guanting reservoir. The Guishui River flowsthrough the country from northeast to southwest. Affected by the storage of Guantingreservoir, the disaster occurred in the banks of Guishui River, such as land swampingand houses collapsed, which has brought adverse impact to local people’s life anddamaged to the industry and agriculture production. In recent years, due to the dryclimate, the Guanting reservoir water has always been in a low level, regionalgroundwater level is also reduced, and the submerged area of the study area trends todecrease. But considering the increasing number of high-risk building in the Yanqingnew district planning area, and the foundation bearing layer is mainly located in theunderground water level. If the rainfall increased, reservoir and surrounding areawater level will both rise up, it may cause certain hazards to the planning andconstruction. Therefore, systematically analyzing the formation mechanism andinfluencing factors of reservoir immersion has the important theoretical meaning anduseful value. The main technical method can also be applied to other similar researchwork.This article has researched regional geological and meteorological andhydrological data of the study area, found out the immersion situation of Guantingreservoir and Yanqing new district. And then, the factor of immersion has beenanalyzed, the relationship between reservoir water level change and immersion hazardhas been analyzed emphatically. Also, the groundwater dynamics method andModflow numerical simulation has being used to calculate groundwater level underdifferent reservoir water level condition in the study area, and then predict theimmersion range and degree. Finally, according to the immersed characteristic anddevelopment trend, effective countermeasures have been put forward. Among them,the basic principle and internal structure of the Modflow calculation has beenintroduced, the setting principle of model boundary has been analyzed, the inversionmethod has been used to calculate the hydrogeological parameters, the imitative effect is well, the prediction results of simulation has a certain reference. Simultaneously,the results are basically the same, according to the forecast simulation based ongroundwater dynamics method and the Modflow numerical simulation, which hascertain practical value. |
