TECHNICAL PAPERS
Aug 16, 2004

Effect of Microtopography, Slope Length and Gradient, and Vegetative Cover on Overland Flow through Simulation

Publication: Journal of Hydrologic Engineering
Volume 9, Issue 5

Abstract

Overland flow on a hillslope is significantly influenced by its microtopography, slope length and gradient, and vegetative cover. A 1D kinematic wave model in conjunction with a revised form of the Green-Ampt infiltration equation was employed to evaluate the effect of these surface conditions. The effect of these conditions was treated through the resistance parameter in the kinematic wave model. The resistance in this paper was considered to be made up of grain resistance, form resistance, and wave resistance. It was found that irregular slopes with microtopography eroded more easily than did regular slopes. The effect of the slope gradient on flow velocity and flow shear stress could be negative or positive. With increasing slope gradient, the flow velocity and shear stress first increased to a peak value, then decreased again, suggesting that there exists a critical slope gradient for flow velocity and shear stress. The vegetative cover was found to protect soil from erosion primarily by enhancing erosion-resisting capacity rather than by decreasing the eroding capability of overland flow.

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References

Abrahams, A. D., Parsons, A. J., and Hirsch, P. J. (1992). “Field and laboratory studies of resistance to interrill overland flow on semi-arid hillslopes, southern Arizona.” Overland flow, A. J. Parsons and A. D. Abrahams, eds., UCL Press, University College London, London, 1–23.
Angermann, T., et al. (2002). “Runoff from orchard floors–micro-plot field experiments and modeling.” J. Hydrol., 265, 178–194.
Casanave, A., and Valentin, C.(1992). “A runoff capability classification system based on surface features criteria in semi-arid areas of West Africa.” J. Hydrol., 130, 231–248.
Chen, L., and Liu, Q. Q.(2001). “On the equations of overland flow and one-dimensional equations for open channel flow with lateral inflow.” Mech. Eng.,23(4), 21–24 (in Chinese).
Chen, L., Liu, Q. Q., and Li, J. C.(2001). “Runoff generation characteristics in typical erosion regions on the Loess Plateau.” Int. J. Sediment Res., 16(4), 473–485.
Chow, V. T. (1959). Open-channel hydraulics, McGraw-Hill, New York.
Dunne, T., and Dietrich, W. E.(1980). “Experimental study of Horton overland flow on tropical hillslopes.” J. Hydrol., 88, 343–365.
Einstein, H. A., and Banks, R. B.(1950). “Fluid resistance of composite roughness.” EOS Trans. Am. Geophys. Union, 31, 603–610.
Govindaraju, R. S., Kavvas, M. L., and Tayfur, G.(1992). “A simplified model for two dimensional overland flows.” Adv. Water Resour., 15, 133–141.
Hirsch, P. J. (1992). “Hydraulic resistance to overland flow on semiarid hillslopes: A physical simulation.” PhD dissertation, Dept. of Geography, State Univ. of New York at Buffalo, Buffalo, N.Y.
Jiang, D. S. (1997). “Soil and water loss in Loess Plateau and the regulation mode.” Hydraulic and Water Power Press of China, Beijing (in Chinese).
Kirkby, M. J., ed. (1978). Hillslope hydrology, Wiley-Interscience, New York.
Lawrence, D. S. L.(2000). “Hydraulic resistance in overland flow during partial and marginal surface inundation: Experimental observations and modeling.” Water Resour. Res., 36(8), 2381–2393.
Li, J. C., Liu, Q. Q., and Zhou, J. F.(2003). “Environmental mechanics in China.” Adv. Appl. Mech., 39, 224–312.
Lima, J. L. M. P. (1989). “Overland flow under rainfall: Some aspects related to modelling and conditioning factors.” PhD thesis, Agricultural Univ. Wageningen, Wageningen, The Netherlands.
Lima, J. L. M. P. (1992). “Model KINNIF for overland flow on pervious surface.” Overland flow, A. J. Parsons and A. D. Abrahams, eds., UCL Press, University College London, London, 69–88.
Liu, Q. Q., Chen, L., and Li, J. C.(2001). “Influences of slop gradient on soil erosion.” Appl. Math. Mech., 22(5), 510–519.
Mein, R. G., and Larson, C. L.(1973). “Modeling infiltration during a steady rain.” Water Resour. Res., 9(2), 384–394.
Parsons, A. J., and Abrahams, A. D., eds. (1992). Overland flow—hydraulics and erosion mechanics, UCL Press, University College London, London.
Posthumus, H., and Spaan, W. P. (2001). “Rainfall runoff relations for vegetation barriers in the Sahel.” Soil Erosion Research for the 21st Century, American Society of Agricultural Engineers, St. Joseph, Mich., 50–53.
Putty, M. R. Y., and Prasad, R.(2000). “Runoff processes in headwater catchment-an experimental study in western ghats, South India.” J. Hydrol., 235, 63–71.
Saghafian, B., Julien, P. Y., and Rajaie, H.(2002). “Runoff hydrograph simulation based on time variable isochrone technique.” J. Hydrol., 261, 193–203.
Shen, B., ed. (1996). “Finite element simulation on surface hydrology.” Xi’an Press of Xibei Technology Univ. Xibei, China.
Shen, H. W., and Li, R. M.(1973). “Rainfall effect on sheet flow over smooth surface.” J. Hydraul. Div., Am. Soc. Civ. Eng., 99(5), 771–792.
Scoging, H. (1992). “Modelling overland-flow hydrology for dynamic hydraulics.” Overland flow, A. J. Parsons and A. D. Abrahams, eds., UCL Press, University College London, London, 89–103.
Singh, V. P., eds. (1996). Kinematic wave modeling in water resources: Surface water hydrology, Wiley, New York.
Singh, V. P., and Woolhiser, D. A.(2002). “Mathematical modeling of watershed hydrology.” J. Hydrologic Eng., 7(4), 270–292.
Tayfur, G., Kavvas, M. L., Govindaraju, R. S., and Storm, D. E.(1993). “Applicability of St. Venant equations for two-dimensional overland flows over rough infiltrating surfaces.” J. Hydraul. Eng., 119(1), 51–63.
Tayfur, G.(2001). “Modeling two-dimensional erosion process over infiltrating surfaces.” J. Hydrologic Eng., 6(3), 259–262.
Tayfur, G., and Kavvas, M. L.(1998). “A really-averaged overland flow equations at hillslope scale.” Hydrological Sciences,43(3), 361–378.
Wang, G. T., Chen, S. L., Boll, J., Stockle, C. O., and McCool, D. K.(2002). “Modeling overland flow based on Saint-Venant equations for a discretized hillslope system.” Hydrolog. Process., 16, 2409–2421.
Woolhiser, D. A., and Ligget, J. A.(1967). “Unsteady one-dimensional flow over a plane—The rising hydrograph.” Water Resour. Res., 3(3), 753–771.
Wu, P. T., and Zhou, P. H.(1994). “Influences of run-drop splash on the hydraulic resistance coefficient of thin water flow.” Journal of Soil Erosion and Soil and water Conservation,8(2), 39–42 (in Chinese).
Yao, W. Y.(1996). “Experimental study on the resistance law of overland flow.” J. Sediment Res., (1), 74–81 (in Chinese).

Information & Authors

Information

Published In

Go to Journal of Hydrologic Engineering
Journal of Hydrologic Engineering
Volume 9Issue 5September 2004
Pages: 375 - 382

History

Received: Apr 22, 2003
Accepted: Jan 16, 2004
Published online: Aug 16, 2004
Published in print: Sep 2004

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Q. Q. Liu
Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, China; also, Visiting Professor, Dept. of Civil and Environmental Engineering, Louisiana State Univ., Baton Rouge, LA 70803.
V. P. Singh, F.ASCE
Dept. of Civil and Environmental Engineering, Louisiana State Univ., Baton Rouge, LA 70803-6405.

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