北江红壤河岸坡面侵蚀水动力特征

doi:10.16843/j.sswc.2017.05.001

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Abstract [Background] Influenced by interaction effects of human activities and natural factors, soil and water conservation function of the riparian zone in Beijiang River is facing serious degradation.[Methods] Based on the field runoff scouring experiment on the red soil slope in the riparian zone of the Beijiang River, this study analyzed the changes in hydrodynamic parameters and their relationship with erosion and sediment yields under different slope gradients (7°, 9°, 11°, and 15°) and runoff inflow rates (15 L/min, 12 L/min, and 9 L/min).[Results]1) The average flow velocity increased with runoff inflow rates and presented significantly positive linear correlation with slope gradient (P<0.01) under the same runoff inflow condition. Reynolds number increased slightly with the increase of runoff inflow time, while it was irregular and complex with increasing slope gradients. The Froude number decreased firstly and then tended to be stable with the increase of the runoff inflow time, and the average Froude number was greater than 1 in all treatments, demonstrating that overland flow was in a state of torrent and presented significantly positive linear correlation with slope gradient (P<0.01). The resistance coefficient increased with runoff inflow time, and increased initially and then decreased with increasing slope gradients, inferring nonlinear relationship existed between resistance coefficient and slope gradient. 2) Runoff coefficient increased first and then maintained stable with the increasing runoff inflow time, and showed significant power function relation with slope gradient (P<0.05). The relationship between sediment yield and discharge duration presented the same variation tendency as Reynolds number, while there was a significant linear relationship between sediment yield and slope (P<0.05). 3) The sediment yield had significantly positive linear correlation with the flow shear stress and stream power (P<0.01).[Conclusions] As the last barrier, the riparian zone is of great significance for retarding surface runoff and trapping sediment from upland into river, thus above results can provide scientific evidence for water and soil conservation of riparian slope in red soil area.

Key words： red soil riparian slope slope gradient runoff scouring hydrodynamic characteristics

Received: 27 November 2016

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S157

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	Articles by authors
	WU Changsong
	ZHAO Qinghe
	LIU Pu
	ZHANG Yifan
	BIAN Ziqi
	XU Shanshan

Cite this article:

WU Changsong,ZHAO Qinghe,LIU Pu, et al. Hydrodynamic characteristics of surface runoff on red soil slope in the riparian zone of the Beijiang River[J]. SSWC, 2017, 15(5): 1-7.

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http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2017.05.001 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2017/V15/I5/1

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