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A non‐equilibrium sediment transport model for rill erosion
Author(s) -
Liu Q. Q.,
Chen L.,
Li J. C.,
Singh V. P.
Publication year - 2006
Publication title -
hydrological processes
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.222
H-Index - 161
eISSN - 1099-1085
pISSN - 0885-6087
DOI - 10.1002/hyp.6288
Subject(s) - rill , sediment transport , erosion , sediment , hydrology (agriculture) , geology , hydraulics , flow (mathematics) , soil science , channel (broadcasting) , geomorphology , environmental science , geotechnical engineering , mechanics , physics , electrical engineering , aerospace engineering , engineering
Sediment transport in rill flows exhibits the characteristics of non‐equilibrium transport, and the sediment transport rate of rill flow gradually recovers along the flow direction by erosion. By employing the concept of partial equilibrium sediment transport from open channel hydraulics, a dynamic model of rill erosion on hillslopes was developed. In the model, a parameter, called the restoration coefficient of sediment transport capacity, was used to express the recovery process of sediment transport rate, which was analysed by dimensional analysis and determined from laboratory experimental data. The values of soil loss simulated by the model were in agreement with observed values. The model results showed that the length and gradient of the hillslope and rainfall intensity had different influences on rill erosion. Copyright © 2006 John Wiley & Sons, Ltd.