Study on variation rule of permeability coefficient in unsaturated zone along the WeiHe River in the intertidal area

Abstract

As a collection place of surface runoff, river is the main place for the water exchange and water quality. It is importance to analyse the interaction between groundwater and surface runoff for the spatial variation of permeability coefficient. In this paper, the unsaturated zone in the intertidal area of Weihe river basin was taken as the research area. The spatial distribution of vertical permeability coefficient was analysed by histogram statistical test. We analysed the function relation between the variance and correlation length of the numerical value and the macroscopic dispersion of sediment. The results show that the average vertical saturated permeability coefficient of unsaturated zone is 0.012 cm/s, the variation of permeability coefficient has strong spatial variability. The vertical permeability coefficient of the unsaturated zone along the Weihe in the intertidal area with the logarithmic normal distribution rule. The longitudinal macroscopic dispersion of the unsaturated zone is 9.7m, and longitudinal macroscopic dispersion is related to the research scale.