Journal
JOURNAL OF HYDROLOGY
Volume 382, Issue 1-4, Pages 115-127Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhydrol.2009.12.022
Keywords
Infiltration; Kinematic wave; Overland roughness; Rainfall excess; Surface runoff; Watershed
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Overland roughness is one of the key parameters in hydraulic modeling of watershed runoff During the evolution of a runoff hydrograph the flow roughness is not constant Hypothesizing a nonlinear relation between surface roughness and flow depth, this Study incorporates variable roughness in a kinematic wave (KW) model and investigates its effect on runoff from four watersheds of varying sizes and hydroclimatic conditions The hydrographs yielded by the KW model with varying overland roughness were in satisfactory agreement with observed runoff hydrographs and the hydrograph shape was well preserved To quantify the effect of variable roughness on runoff, the hydrographs generated by the KW model with variable roughness were compared with those generated with constant overland roughness Based oil the Study. it was observed that hydrograph shape is in general, better preserved in case of variable roughness than the constant roughness (C) 2009 Elsevier B.V. All rights reserved
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