Document Type



Distributed model, kinematic model, sediment production, watershed modelling, erosion


The model developed herein uses a detailed geometric description of the watershed and incorporates the kinematic wave approximation of the equations of motion, superposition, and time-lag methods to analyze flood and sediment flows. The watershed is broken down along tributary divides into subcatchments, which are divided along lines of steepest slope into "streamtubes." These streamtubes are further divided according to slope into "segments," such that topographic parameters of each segment are spatially constant over the segment. The flow from the streamtube enters the channel at the mid-point of the stream tube bordering the channel. This point is called a "node." Channel routing is performed from node to node. A unique node numbering and coding system is defined to efficiently order the computations along the streamtubes and channel sections for any arbitrary streamtube pattern. Sediment detachment capacity is expressed as a power function of shear stress and a function of the Universal Soil Loss Equation. Sediment transport capacity is expressed as a power function of shear stress. The rate of sediment transport is computed by substituting the transport and detachment capacity equations into the sediment continuity equation. The model is applied to Ralston Creek, an agricultural watershed in Iowa City, Iowa. Results of this analysis are presented and applicability to other watersheds is discussed.

Publication Date

September 1980

Journal Title

Proceedings of the Iowa Academy of Science





First Page


Last Page



©1980 Iowa Academy of Science, Inc.



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