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Simulation of the direct runoff hydrograph at basin outlet

✍ Scribed by Florisa Melone; Corrado Corradini; Vijay P. Singh

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
186 KB
Volume
12
Category
Article
ISSN
0885-6087

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✦ Synopsis

A simple model describing the transformation of eective rainfall to direct runo through the overland ¯ow mechanism is presented. The model is based on the classical representation of a watershed by a combination of planes and channels. The dynamics of overland ¯ow in each plane is simulated by the non-linear kinematic wave, but the out¯ow from a given plane is concentrated in the middle of the corresponding drainage channel. The water routing in the channels is carried out by a piece-wise linearized formulation in space of the kinematic wave approximation. Using synthetic events on 10 watersheds, the model was tested by comparing it with results obtained by applying the non-linear kinematic wave to all the elements of the watershed. The model was found to be adequate, even in a form that simpli®es the geometric features of the planes through an averaging procedure based on the Horton±Strahler ordering scheme of the watershed.

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