The Experimental Study And Numerical Simulation On Typical Solute Transport Rule In Soil

With the high-speed development of industry and agriculture and the influence of the activities of the mankind. The problem which soil and groundwater was polluted is paid more and more attention.the essence of the matter is the result of solute transport in soil and water-bearing formation under the condition of water flow. In theory,it involves solute transport theory. In order to deeply grasp the transform mechanism and provide scientific basis for environment evaluate and harness,this paper combines experiment with numerical simulation, and studies the transport of typical solute (fluorine and chlorine) in soil.(1)experimental study: the experiments of solute transport and unsaturated soil and water movement, solute transport experiment studies solute transport in soil in the directions of vertical and horizontal.and in different soil texture, different solute transport in soil, solute transport by the different means adding solute and under the different hydraulic condition.unsaturated soil and water movement experiment includes the water retention curve experiment and the unsaturated hydraulic conductivity. This part had studied the specific property of holding water and unsaturated conductivity of different texture soil. At last,VG model was adopted to simulate experiment data and the unsaturated parameter was obtained.(2) Through the comprehensive analysis to experimental data, the author had adopted advective-dispersive equation , made use of analytic solution, compiled the program of least square method, and deeply probed into the law of solute transport,at the same time, summed up experience formula which quantitatively depicted the law of solute concentration attenuation with the process of time at the phase of eluviating.(3)Numerical simulate: the finite difference program was compiled to simulate solute concentration distribution with time and distance.its property was proved by the soil trough experimental model.(4)The paper gives a example of waste ore including fluorine piled up in JingHua area, the mathematical model was used to analysis and evaluate fluoride transport and diffuse in soil under the condition of eluviating.(5)aimed at the shortages of the study in this thesis, question was pointed out and prospected.