Journal of Food, Agriculture and Environment
The effects of hedgerows block on hydrodynamic parameters and transporting sediments capacity of shallow gully flow
Author(s):
Chunqing Zhao 1,
Chongfa Cai 2*, Shuwen Ding 2, Shufang Ding 1Recieved Date: 2013-05-24, Accepted Date: 2013-09-26
Abstract:Shallow gully erosion is one of the principal slope farmland erosion, hedgerows as filter belt to reduce slope shallow gully erosion is an effective biological measures for soil and water conservation, which has been more practical applied in humid and sub-humid areas of southern china. In order to study the effects of hedgerows block on transporting sediments capacity of shallow gully flow from hydrodynamic mechanism, we studied hydrodynamic parameters and transporting sediments capacity using simulation experiment in erosion tank with hedgerows filter belt and no hedgerows filter belt. The flow setting was 0.02, 0.05, 0.10 and 0.13 m3/min, the slope setting was 1, 5, 15 and 25°. The experimental results showed that the Reynolds number of shallow gully flow was from 842 to 5463, the Froude number was from 3.62 to 19.34, the shallow gully flow was turbulent flow and its flow pattern belonged to rapids flow without hedgerows block. The transporting sediments capacity was increased with the increase of the flow, the slope had very obvious effects on the transporting sediments capacity. Hedgerows block had few effects on Reynolds number, however, hedgerows block had obvious effects on Froude number when the slope was in the 1 and 5°, particularly, under the dense hedgerows block condition, its effects were more obvious. Hedgerows block had few effects on the Froude number when the slope was in the 15 and 25°. The blocking effects of hedgerows on sediments was obvious when the slope was in the 1 and 5°, and the effects were minimal when the slope was in the 15 and 25°.
Keywords:Shallow gully erosion,
hedgerows block, flow pattern, transporting sediments capacityJournal: Journal of Food, Agriculture and Environment
Year: 2013
Volume: 11
Issue: 3&4
Category: Environment
Pages: 2036-2039
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