Validation of an analytical model of groundwater velocity based on laboratory test and numerical simulation

Abstract

Abstract Surface water-groundwater exchange affects the material and energy transfer of rivers and adjacent riparian zones. As an intuitive carrier of energy, temperature can effectively reflect the Spatio-temporal changes the surface water-groundwater exchange process. In this paper, the influence of water head variation and sand sample uniformity on its temperature field and seepage field is studied through a one-dimensional sand column laboratory test. Compare the vertical seepage velocities measured in laboratory tests with the vertical underflow exchange rate calculated by the four analytical models to verify the accuracy of the one-dimensional vertical heat analytical model. The results show that the Hatch analytical solution, Keery analytical solution, McCallum analytical solution and Luce analytical solution calculated by VFLUX2 through MATLAB are reliable for calculating the vertical undercurrent exchange rate of the heterogeneous sand column.