Document Type : Research Paper
Authors
1 Assistant Professor, Agricultural and Natural Resources Research Center, Khorasan, Iran
2 Asociated Professor, Soil Conservation and Watershed Management Research Institue, Iran
Abstract
One of the usual methods for river banks protection is using Gabion groyne structures. If this permeable structure is designed and constructed appropriately, it will control bank erosion and reclaims flood plain areas. Since there are some uncertainties in the determination of length, space and shape of Gabion groyne, this experimental project was performed. In this investigation a laboratory movable bed flume with 17m length, 1.5m width and 0.8m depth was used to study local scour near the head of unsubmerged Gabion groynes. The T shape and straight groynes were constructed perpendicular to the flume's wall. Groynes with two different lengths of 15.0 and 22.5 centimeter (i.e. two contraction ratios of 20% and 30%) and four different spaces (i.e. four ratios of space to length, S/L), were used with one constant bed material, one constant bed slope and three different discharges. Based on the experimental results, a dimensionless relationship was derived for estimation of Local Scour near the Head of straight and T shape Gabion groynes.
Keywords
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