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[1]LI Guang-lu,PANG Xiao-ming,YAO Jun.The Disturbed Ability and Sediment Transport of Shallow Flow under Raindrop Impact[J].Research of Soil and Water Conservation,2010,17(02):24-27,31.

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The Disturbed Ability and Sediment Transport of Shallow Flow under Raindrop Impact

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 17 Number of periods: 2010 02 Page number: 24-27,31 Column: Public date: 2010-04-20

Title:: The Disturbed Ability and Sediment Transport of Shallow Flow under Raindrop Impact

Author(s):: LI Guang-lu¹, PANG Xiao-ming², YAO Jun¹; 1. College of Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China;
2. Tianshui Soil and Water Conservation Experiment Station of YRCC, Tianshui, Gansu 741000, China

Keywords:: raindrop impact; shallow flow; disturbed coefficient; sediment transport

CLC:: S157.1

DOI:: -

Abstract:: By using the artificial rainfall, the shallow flow pattern, disturbed ability and sediment transport on slope surface were studied under the raindrop impact. The results showed the shallow flow pattern on slope surface under raindrop impact namely wasn’t the laminar flow, also wasn’t turbulent flow, but belonged to highly mixed disturbed flow under raindrop vertical impacts. The sediment detachment of shallow flow under raindrop impact was obviously bigger than that under no raindrop impact, the bigger was the impacting raindrop diameter, the higher was the amount of sediment detachment, both assumes the index rule change, indicating that the raindrop impacts were the main power to lead to the sediment transport on the shallow flow of slope surface. The disturbed ability of raindrop splashes to the shallow flow decreased with the exponential relations, as the flow depth and the raindrop diameter ratio increased. When the raindrop diameter is 2.5 to 3 times greater than the depth of shallow flow, the raindrop splashes to the shallow flow were basic non-disturbed function. Based on the major effect factors on raindrop splashes, this paper proposed a forecast equation for the disturbed coefficient on gentle slope surface, which had an important significance to study the sediment forecast model on shallow flow.

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