| Groundwater is mainly supply water resource in Shenyang City, Hun River is the main recharge source of groundwater., directly involved in groundwater cycle. Survery of Shenyang groundwater results shows that gorundwater quality is worrying.and the main pollutant in the groundwater is ammonia, nitrate,nitrogen and nitrite nitrogen.In order to research on migration and transformation rules of Ammonia-nitrite-nitrates in aquifer of Hun River Alluvial-pluvial Fan,a groundwater numerical modeling and a solute transport Numerical model along the Hun River was established. The numerical model apply to predict“Three-Nitrogen”distribution in the temporal and spatial trends, provide basis for contaminated water body control and Remediation of riverside groundwater drinking source.Select Groundwater Modeling System (GMS) software, MODFLOW use to establish the riverside groundwater model, MT3DMS use to establish solute transport Numerical model. Firstly ,ues ROCKWORK software to eatablish Three-Dimensional stratum model based on borehole data. then, analysis hydro-geological conditions of the study area.Establish Initial flow model need to generalized hydro-geological conditions from the aquifer perspective.Through the identification verification,, we gain the rational parameters and groundwater flow numerical simulation model Consistenting with the actual hydro-geological conditions of the study area. The simulation results show that high intensity exploitation water source generated the cone of depression. Combined water well quality 1998-2008 with the actual survey sample data ,study the distribution characteristic and evolution law of Three-Nitrogen.Based on the groundwater flow model establish three-nitrogen solute transportion model, which major consideration convection-diffusion theory. Then, the solute numerical modeling apply to predict to”Three-Nitrogen”distribution in the temporal and spatial trends in the next 20 years.Under steady state flow, Three-Nitrogen distributes along the strike of the Hun River, the north polluted condition is more Serious than the south bank of Hun River . The influenced extent and exceed range of ammonia is more than the other two.,the maximum influenced width is about 2000 meters. The overall concentration of ammonia along the Xi river is higher than the Hun River, but the maximum influenced width is about 800 meters. The nitrate nitrogen mainly distribute in the Hun River upstream and middle reaches. The nitrite distribute along the river from the top to downstream.Combined water well quality 1998-2008 with the actual survey sample analysis results , predictive model was of basic accuracy. The influenced extent and exceed range of ammonia enlarged gradually with time. The solute transportion model predict that the influenced extent of ammonia is 248.84m2 and exceed range of ammonia is 88.34m2 in next 20 years. LiGuang and LangJia group of extraction wells in Water intake 1 almost all exceeded the standard, the contamination of the water plant were most serious. Well of Water intake 2 far away from the river, and not in the affected range. The South dam,Laonanta and Shashan extraction wells of 3 Water intake exceeded the allowed standard. The extraction wells of 4 Water intake distribute linely in the south bank of the Hun River. part of the wells exceeded ,in Qian sai and Dong mo village close to the Hun River. Water intake 8 located upstream of Hun River, some wells in ammonia affected range, but lower concentrations are not exceeded.Hun River and the Xi river as major pollution source of groundwater. To ensure groundwater quality of water source in riverside, need to carry out restoration and treatment of surface water, reduce pollution from the source. |
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