Research On Seepage Flow Field And Numerical Simulation Of On-site Experiment Of Infiltration Diversion

The technique of infiltration diversion near the river,collecting the water from the riverbed,is a new one developed in recent years. To solve the problem that the water quantity can not be calculated correctly,the following researches were made:(1) Discussing the properties of the on-site experimental seepage flow field of one infiltration diversion project guided by the basic theory of groundwater flow in porous media.(2) Establishing the mathematical model of hydrology based on the analysis of seepage flow field of the experiment and doing the numerical simulation with Modflow.(3) Analyzing the factors that influence the water quantity. Firstly,study the hydrodynamic properties in the filtering bed;secondly,analyze the influencing factors by the method of numerical simulation with the above mathematical model.The researches indicated:(1) The seepage flow field of infiltration diversion is characterized by three-dimensional,saturated and steady flow. There is the close hydraulic relationship between the river and the groundwater in the filtering bed,and the groundwater is confined.(2) The three-dimensional,saturated and steady mathematical model established on the basis of the experiment is applicable.(3) The blockage of filtering bed and the thickening of the argitan can cause the change of hydrodynamic properties in the filtering bed,which leads to the decrease of water quantity.(4) The maximum water quantity becomes greater,the better is the filtering bed permeability,the higher the river hydraulic conductance,the higher the river level,the larger the water-collecting area and the bigger the distance between collecting pipes. The water quantity varies directly with drawdown.