FLOW STRUCTURE AND SAFE REGION FOR FISH HABITAT IN RIVERS

Publisher:
IAHR
Publication Type:
Conference Proceeding
Citation:
9th international symposium on ecohydraulics 2012, 2012, pp. 1 - 8
Issue Date:
2012-01
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In large rivers, the life of animals including fish is at risk due to establishment of some hydraulic structures like dams and weirs. Few fish habitat activities including the installation of rocks, rock clusters, rock weirs and other instream works have been done in rivers to minimize the problem. The most important advantage of the habitat structures are their downstream hydraulic condition such as large depth and smaller velocity. These hydraulic conditions provide an area for fish to rest and to feed. In this study, to determine the fish habitat safe region area, evaluations were done in laboratory flume to simulate natural conditions. A quartersphere made of concrete was installed at the bed of flume and then flow velocity in two directions was measured using small electromagnetic velocimeter and PIV. To find the geometry of safe region behind a quarter-sphere the streamlines, contour vectors, location and size of safe region was determined. By drawing the contour lines of velocity and detection of contour vectors, location and size of safe region, it was found that close to the body, the safe region is located adjacent to the bed, and far away from the body. Furthermore, it is concluded that far away from the body, safe region is located in upper depths and by moving toward body peak, safe region area decreases.
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