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A LABORATORY STUDY OF SEDIMENT TRANSPORT CAPACITY IN THE DYNAMIC PROCESS OF RILL EROSION
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2001
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The transport capacity of flowing water in a rill is one of the important parameters in soil erosion, especially insoil erosion prediction and soil erosion process modeling. Theory suggests that under steady flow, sediment yield will increasewith slope length and will approach its limit: the highest possible sediment concentration at transport capacity of the flow.The objective of this study was to develop a method to measure transport capacity of flow. A series of 405 flume experimentswere conducted with a siltyclay (loess) soil. A mathematical expression was presented to estimate transport capacity fromthe experimental data under five slopes (5, 10, 15, 20, 25), and three flow rates (2, 4, 8 l/min). The transport capacityis simply given as the product of unitwidth flow rate with the limit value of the sediment function with rill length. Transportcapacity was found to be related to slope and flow rate. For practical purposes, a method was suggested to estimate the rilllength required for determining transport capacity at different slope and flow rate.