Frictional Resistance of Overland Flow on Tropical Turfed Slope
Publication: Journal of Hydraulic Engineering
Volume 118, Issue 1
Abstract
Based on the field experiments conducted on a slope consisting of cow grass (Axonopus Compressus), the study presents the frictional resistance of overland flow on the turfed slope. The rigid stems associted with cow grass deflect the water around themselves, generating a high level of turbulence. The frictional resistance in this study is presented in terms of both the Manning n and the Darcy-Weisbach friction factor f. The results show that both the density of the turf and depth of flow play an important role in affecting the frictional resistance to flow. A high-density grass plot produces high resistance to flow and vice versa. The results also show that the frictional resistance decreases for increasing flow Reynolds number through the grass. Based on analysis of the field data, a value of two-thirds is found to be appropriate for use as the exponent of flow depth in the Manning equation for shallow overland flow.
Get full access to this article
View all available purchase options and get full access to this article.
References
1.
Chen, C. L. (1976). “Flow resistance in broad shallow grassed channels.” J. Hydr. Div., ASCE, 102(3), 307–322.
2.
Engman, E. T. (1989). “The applicability of Manning's n values for shallow overland flow.” Proc. of the Int. Conference for Centennial of Manning's Formula and Kuichling's Rational Formula, University of Virginia, May, 292–308.
3.
Kouwen, N., and Li, R. M. (1980). “Biomechanics of vegetative channel linings.” J. Hydr. Div., ASCE, 106(6), 1085–1103.
Information & Authors
Information
Published In
Copyright
Copyright © 1992 ASCE.
History
Published online: Jan 1, 1992
Published in print: Jan 1992
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.