关键词: 咸水体, 示踪试验, 弥散系数, 尺度效应, 内推-外延法

Abstract:

In order to determine the dispersion coefficient and simulate the saline water migration, a tracer test has been designed and carried out aim at the distribution of the saline water in the aquifer,  which based on the geological background of the study area and the hydrogeologic condition. With the test data, the vertical and lateral migration characteristics of the saline water were analyzed preliminary and a push-extension method was present to predict the dispersion coefficient or dispersity under the multi-scale dependent on single-scale tracer test results. The tracer test illustrated the different effects of the saline water to the pumping well and attained the longitudinal dispersity is 7.42 m and latitudinal dispersity is 41.4 m. From the analysis of the solution of the dispersion equation, scale effect about the desperty has been discussed, and the relation has been set up to be as y=0.007 5e^{0.129 3x} and y=0.102 9e^{0.049 2x}, respectivity. These quantitative relation are suitable for the dispersion coefficient calculation and the scale-effect analyzation, thereby this will provide a further data basis for the simulation and prediction on the water-salt transport characteristics.

Key words: saline water, tracer test, dispersion coefficient, scale effect, push-extension method