Time of concentration of surface flow in complex hillslopes

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Title:Time of concentration of surface flow in complex hillslopes
Creators:
Sabzevari, Touraj; T_sabzevari at iauestahban dot ac dot ir ; Department of Civil Engineering, Estahban Branch, Islamic Azad University, Estahban, Iran.
Saghafian, Bahram; Science and Research Branch, Islamic Azad University, Tehran, Iran.
Talebi, Ali; Faculty of Natural Resources, Yazd University, Yazd, Iran
Ardakanian, Reza; Department of Civil Engineering, Sharif University of Technology, Tehran, Iran.
Journal or Publication Title:
Journal of Hydrology and Hydromechanics, 61, 4, pp. 269-277
Uncontrolled Keywords:complex hillslopes, time of concentration, surface flow

Abstract

Time of concentration (TC) of surface flow in watersheds depends on the coupled response of hillslopes and stream networks. The important point in this background is to study the effects of the geometry and the shape of complex hillslopes on the time of concentration considering the degree of flow convergence (convergent, parallel or divergent) as well as the profile curvature (concave, straight or convex). In this research, the shape factor of complex hillslopes as introduced by Agnese et al. (2007) is generalized and linked to the TC. A new model for calculating TC of complex hillslopes is presented, which depends on the plan shape, the type and degree of profile curvature, the Manning roughness coefficient, the flow regime, the length, the average slope, and the excess rainfall intensity. The presented model was compared to that proposed by Singh and Agiralioglu (1981a,b) and Agiralioglu (1985). Moreover, the results of laboratory experiments on the travel time of surface flow of complex hillslopes were used to calibrate the model. The results showed that TC for convergent hillslopes is nearly double those of parallel and divergent ones. TC in convex hillslopes was very close to that in straight and concave hillslopes. While the effect of convergence on TC is considerable, the curvature effect confirmed insignificant. Finally, in convergent hillslopes, TC increases with the degree of convergence, but in divergent hillslopes, it decreases as degree of divergence increases.

Official URL: http://147.213.145.2/vc/vc1.asp

Title:Time of concentration of surface flow in complex hillslopes
Translated title: Time of concentration of surface flow in complex hillslopes
Creators:
Sabzevari, Touraj; T_sabzevari at iauestahban dot ac dot ir ; Department of Civil Engineering, Estahban Branch, Islamic Azad University, Estahban, Iran.
Saghafian, Bahram; Science and Research Branch, Islamic Azad University, Tehran, Iran.
Talebi, Ali; Faculty of Natural Resources, Yazd University, Yazd, Iran
Ardakanian, Reza; Department of Civil Engineering, Sharif University of Technology, Tehran, Iran.
Uncontrolled Keywords:complex hillslopes, time of concentration, surface flow
Subjects:T Technology > TA Engineering (General). Civil engineering (General)
Divisions:Mathematics, Physics and Earth Sciences > Institute of Hydrodynamics > Journal of Hydrology and Hydromechanics
Journal or Publication Title:Journal of Hydrology and Hydromechanics
Volume:61
Number:4
Page Range:pp. 269-277
ISSN:0042-790X
Publisher:Institute of Hydrology of the Slovak Academy of Sciences and the Institute of Hydrodynamics of the Academy of Sciences of the Czech Republic
Related URLs:
URLURL Type
http://avi.lib.cas.cz/node/55Publisher
ID Code:8169
Item Type:Article
Deposited On:05 Jun 2014 18:29
Last Modified:05 Jun 2014 16:29

Citation

Sabzevari, Touraj; Saghafian, Bahram; Talebi, Ali; Ardakanian, Reza (2013) Time of concentration of surface flow in complex hillslopes. Journal of Hydrology and Hydromechanics, 61 (4). pp. 269-277. ISSN 0042-790X

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