The Study And Simulating On The Influence Of River Pollution To Groundwater

In recent years, pollution of rivers and other surface water has become increasinglyserious, and while there is a relationship of mutual transformation of rivers and ground water,when the river is contaminated, groundwater, and the tight distribution in accordance with theriverside to the inevitable contamination of this has seriously affected the normal operation ofagriculture and industry and socio-economic development and human safety of drinking water.On this basis, the evolutionary relationship between rivers and groundwater as the main line,using the method of combining physical modeling experiment and numerical simulation ofsand box, were sieved to different media, conservative substances NaCl and non-conservativesubstances nitrobenzene in the river-groundwater system in the transport and transformationof building convection diffusion, adsorption of water flow and solute transport under thecombined action of the coupling model, quantitative description of river pollution influence ofgroundwater level. The following conclusions can be concluded:1、The results of water flow experiments show: when the media is fine sand,setting theriver level160cm, as the hydraulic gradient J<0.78, the river and groundwater has unifiedwater level; as J=0.78, the water level is critical disjoined; as J>0.78, the water level isdisconnected;while the media is medium sand, the critical disjoined gradient is0.72.2、The solute transport in river-groundwater system shows that: the contaminant in theriver-groundwater system during the migration process, occurrence of gravitationaldifferentiation phenomenon, the performance of the migration range of the z direction withinthe same time much larger than the x direction, this phenomenon in a puredispersion effect ismore obvious.3、Pollutant in the river-groundwater system by a variety of factors: hydraulic gradient,aquifer media, the type of contaminant transport processes. Other things being equal, theaquifer media is more coarse particles of NaCl is about contaminant transport faster; NaCl inmigration speed than nitrobenzene migration speed, and eventually reach the maximum stablevalue of the relative concentrations of slightly larger nitrobenzene is about0.85.4、Contaminant transport coupling model, better fits the experimental measured data, anddifferent complex conditions of pollutants in the river-the migration law in the groundwatersystem simulated.