The Study Of The Impacts Of Underground Reservoir Construction On The Surrounding Groundwater

After the south-north water into Beijing, the local water resources structure willundergo great changes. In order to improve Beijing water level of assurance, we canartificial recharge local surpluses and diversion of surface water during the wet yearsand the water level was more than water into underground reservoirs for storage. Thestudy area is located in the northeast of Beijing, study range Miyun County, ShunyiDistrict, north of Huairou District and gates Chaobaihe sunny plains area. Aimed atthe characteristics of water resources in Beijing, in combination with the surpluswater to regulate project, we carry out special research of groundwater. Through theestablishment of the vadose zone numerical simulation model, simulation modelaquifer recharge and river scene assisted leaching tests on groundwater analysis, wescientific evaluate infiltration of groundwater irrigation return water quality, quantityand scope of impact. The main results of this paper include the followings:(1) This study back in typical irrigated river leaching test site vadose zone.Through the analysis of ion concentration in the effluent monitoring results that hole,we find that cation exchange adsorption obviously occurred in the vadose zone,particle surface adsorption of ammonia or leaching of soil melting process of soilnitrification occurred slightly, soil physical leaching obvious. The concentration of thechemical components of the monitoring holes out of the water on the whole lower,indicating Chaobai river vadose zone soil samples is more pure, not subject to surfacecontamination sources.(2) Based on the local identifying hydrogeological conditions and other factors,the paper specificly analyzes Chaobaihe vadose zone site, using numerical simulationsoftware HYDRUS to establish Chaobaihe vadose zone flow values model. Byanalyzing the data from the model, when the head is small river recharge, calculatingthe minimum amount of water recharge of290days, to ensure12Km recharge riversof water, the outflow through the vadose zone at the bottom boundary of9.676×109m3.(3) The use of groundwater numerical simulation software GMS establishing numerical groundwater flow model, using the model to predict the trends of differentgroundwater level regulation and storage conditions, predicting whether the receivingwater recharge underground reservoirs landfill floor will be ground water soakingunder different scenarios, preventing contamination of groundwater. According to theapproved Miyun Storage Project design plan, the remaining water diversion at the endof2014to the end of2019covering the ground, covering the period of time from theannual March1to December15totaled290days, has developed nine kinds of watersolutions. Through simulation results, it carried out the greatest appreciation under theconditions of the program nine, rising the water level7m or so, the overall water levelin northern elevation of less than35m, the overall water level elevation in central andsouthern regions still less than20m.(4) The survey shows that the northern part of the study area unregulated landfill50m above floor level, the central and south study area of informal landfill overall in30m above floor level. Ultimately, we concluded that Peripheral source water qualitywill not affect the water table elevation and soak informal landfill.