Overland Flow Times of Concentration for Hillslopes of Complex Topography
Publication: Journal of Irrigation and Drainage Engineering
Volume 142, Issue 3
Abstract
The time of concentration is an important parameter for predicting peak discharge at the basin outlet and for designing urban infrastructure facilities. In studying the hillslope response, employing hydraulic equations of flow, the shape of the hillslope geometry has often been assumed as rectangular and planar. However, natural hillslopes have complex topographies whose shapes are characterized by irregularly spaced contour lines. Recently, kinematic wave time of concentration has been derived for rectangular and curved parallel hillslopes. This paper extends this work to hillslopes of complex planform geometry, considering the degree of divergence or convergence of the hillslope. The extended formulation consists of only one equation that is valid for both divergent/convergent surfaces and for concave/convex hillslope profile, and is compared with the formulations for plane convergent and plane divergent surfaces previously introduced. Results are compared with those already available in the literature, which were obtained by using the nonlinear storage model applied to the same complex hillslopes.
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Acknowledgments
Research was co-financed by Università degli Studi di Palermo (FFR 2012–2013) and by Ministero dell’Istruzione, dell’Università e della Ricerca (FIRB 2012–2015). The contribution to the manuscript has to be shared between authors as follows: derivations and applications of the proposed procedure were carried out by the first author; both authors analyzed results and wrote the text. The authors wish to thank the anonymous reviewers for the helpful comments and suggestions made during the revision stage.
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Published In
Journal of Irrigation and Drainage Engineering
Volume 142 • Issue 3 • March 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Feb 7, 2015
Accepted: Sep 23, 2015
Published online: Dec 10, 2015
Published in print: Mar 1, 2016
Discussion open until: May 10, 2016
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