Modeling Event-Based Temporal Variability of Flow Resistance Coefficient
Publication: Journal of Hydrologic Engineering
Volume 8, Issue 5
Abstract
During the storm duration, the effects of surface resistance on the developing and receding overland flow depths on different flow parameters like the overland flow resistance coefficient flow velocities Reynolds number and Froude number have been studied for the six natural catchments (0.012–92.5 km2) located in different agroclimatic regions of India. The kinematic wave (KW) equations are used for simulation of overland and channel flows using explicit methods for developing numerical solutions for the estimation of flow parameters at short durations. For the complete storm duration relationships have been found to form hysteresis loops. To predict resistance coefficients, simple relationships have been worked out separately for the rising and depleting overland flow conditions. Computed hydrographs simulated by incorporating these equations in the KW model agree well with the observed ones. The overall applicability of the suggested approach is successfully demonstrated under ungauged situations as well.
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Copyright © 2003 American Society of Civil Engineers.
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Received: Nov 19, 2001
Accepted: Mar 4, 2003
Published online: Aug 15, 2003
Published in print: Sep 2003
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