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An Improved Darcys Model of Soil Water Movement with Preferential Paths

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Pp. 125-128 in Preferential Flow, Water Movement and Chemical Transport in the Environment, Proc. 2nd Int. Symp. (3-5 January 2001, Honolulu, Hawaii, USA), eds. D. D. Bosch and K. W. King. St. Joseph, Michigan: ASAE  701P0006.(doi:10.13031/2013.2145)
Authors:   Z. R. Wang and W. Y. Wang
Keywords:   Preferential Paths, Finger, Macropore, Darcys Model

Over the last 50 years, much interests been focused on preferential flows including macropore, finger and funnel flows and many important progress have been made. In this article, finger flows are classified into two types according to their respective physical mechanisms, i.e. finger flows of type I - preferential flows in homogeneous continuum media with randomness in initial conditions - and finger flows of type II - preferential flows in inhomogeneous continuum media. It is argued that in both cases Darcys law should always hold which plays an important role in the physical interpretation for the finger formation (with random modifications in soil potential in the case of type II). In contrast to the classification of finger flows, macropore flows are preferential flows in discontinuous media, and the concept of random potential might equally well applicable to these cases.

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