Study on the Influence of Heterogeneous Field with Permeability Coefficient on Subsurface Flow Exchange at the Dune Scale
In order to study the influence of heterogeneous field with permeability coefficient to the subsurface flow exchange,this study adopted a stochastic first-order analysis method to explore the cross-correlation between hyporheic exchange flux and permeability coefficient,as well as the spatial distribution of velocity variance.The results show that hyporheic exchange flux is positively correlated with permeability coefficient heterogeneity in every part of the streambeds with the high cross-correlation zone near the dunes surface.Ignoring the heterogeneity of the riverbed will lead to greater uncertainty of the flow velocity at the shallow position of the riverbed,in the field,the permeability coeffi-cient of the shallow position of the riverbed should be monitored to reduce the uncertainty of the subsurface flow exchange.
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