The experimental study of hydrodynamic characteristics of the overland flow on a slope with three-dimensional Geomat
The hydrodynamic characteristics of the overland flow on a slope with a three-dimensional Geomat are studied for different rainfall intensities and slope gradients. The rainfall intensity is adjusted in the rainfall simulation system. It is shown that the velocity of the overland flow has a strong positive correlation with the slope length and the rainfall intensity, the scour depth decreases with the increase of the slope gradient for a given rainfall intensity, and the scour depth increases with the increase of the rainfall intensity for a given slope gradient, the overland flow starts with a transitional flow on the top and finishes with a turbulent flow on the bottom on the slope with the three-dimensional Geomat for different rainfall intensities and slope gradients, the resistance coefficient and the turbulent flow Reynolds number are in positively related logarithmic functions, the resistance coefficient and the slope gradient are in positively related power functions, and the trend becomes leveled with the increase of the rainfall intensity. This study provides some important theoretical insight for further studies of the hydrodynamic process of the erosion on the slope surface with a three-dimensional Geomat.
KeywordsThree-dimensional Geomat rainfall intensity slope gradient overland flow hydrodynamic characteristics
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- Liu Q. Q., Li J. C., Chen L. Dynamics of overland flow and soil erosion (I)-Overland flow [J]. Advances in Mechanics, 2004, 34(3): 360–372(in Chinese).Google Scholar
- María G. S., John S. G., John L. N. Non-uniform overland flow-infiltration model for roadside swales [J]. Journal of Hydrology, 2017, 552(1): 586–599.Google Scholar
- Cao Y., Zhang G. H., Tang K. M. et al. Experiment on the effect of simulated surface cover on the overland flow velocity [J]. Journal of Mountain Science, 2011, 29(6): 654–659(in Chinese).Google Scholar
- Zhang K. L., Tang K. L. A study on hydraulic characteristics of flow for prediction of rill detachment capacity on loess slope [J]. Acta Pedologica Sinica, 2000, 37(1): 9–15 (in Chinese).Google Scholar
- Liu H. Y., Chang A. D. The Trial calculating method of radius of influence in isolated-well discharge formulas using pumping data [J]. Journal of Irrigation and Drainage, 2008, (2): 74–76, 85(in Chinese).Google Scholar
- Jiang C. B., Long Y. N., Hu S. X. et al. Recent progress in studies of overland flow resistance [J]. Journal of Hydraulic Engineering, 2012, 43(2): 189–197(in Chinese).Google Scholar
- Wu S. F., Wu P. T., Yuan L. F. Hydraulic characteristics of sheet flow with slope runoff regulation [J]. Transactions of the Chinese Society of Agricultural Engineering, 2010, 26(3): 14–19(in Chinese).Google Scholar
- Ding W. F., Li Z. B., Ding D. S. Study on hydrodynamic characters of runoff in rill erosion process on slope [J]. Journal of Soil Water Conservation, 2002, 16(3): 72–75(in Chinese).Google Scholar
- Pan C. Z., Shangguan Z. P. Hydraulic characteristics of silt-laden flow on different gradient grassplots and its mechanism of sediment retention [J]. Advances in Water Science, 2007, 18(4): 490–495(in Chinese).Google Scholar
- Lv Z. Q., Lei X. Z., Zhang P. F. Experimental analysis of hydrodynamic characteristics of overland flow under condition of artificial rainfall [J]. Water Resources and Power, 2010, 28(5): 1–3(in Chinese).Google Scholar
- Chen L., Liu Q. Q., Li J. C. Study on the runoff generation process on the slope with numerical method [J]. Journal of Sediment Research, 2001, (4): 61–67(in Chinese).Google Scholar
- Jing X. F., Lv H. X., Pan C. Z. et al. Preliminary study on flow pattern determinant method of shallow flow on slope surface [J]. Transactions of the Chinese Society of Agricultural Engineering, 2007, 23(5): 56–60(in Chinese).Google Scholar