Document Type : Research Paper
Authors
1 PhD student, Faculty of Agriculture, University of Birjand, Iran
2 Associate Professor, Faculty of Agriculture, University of Birjand, Iran
3 Associate Professor, Faculty of Engineering, University of Birjand, Iran
4 Assistant Professor, Natural Resources and Watershed Management Research Department, Khozestan Agricultural and Natural Resources Research and Education Center, AREEO, Ahvaz, Iran
Abstract
Deposition of density current the main threats reservoir and its watershed numerous areas of application.In this study Six types of vegetation arrangement similar impact convergent, divergent similar, parallel, z(ed) shape, zigzag and checkered studied the density current control is completed. The experiments were performed in a channel length of 10 meters. Made of plastic and the covering vegetation was three meters. Then density current speed in 6 sections 0.5 and 4 meters between the Vegetation was measured after coating. Experiments with 3 Slope bed 0, 1 and 2%, with a salt concentration of 40 and 80 g/l was repeated. The results show if there are vegetation in front of density currents, the speed of the front reduces consequently. Also results showed that vegetation leading to an average of 21-59 per cent density current. After passing density current vegetation Density current rate rises at one point that this speed is not impressive and always density current Substrate without vegetationis also affected.
Keywords
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