Laboratory Investigation of Environmental Friendly Fishway for Rubber Dams
Journal Title: Journal of River Engineering - Year 2014, Vol 2, Issue 6
Abstract
Since they serve important roles in fish migration and survival, the fishway are the main components of river cross structures like dams. Recent years have witnessed an amalgamation of researches and development of rubber dams within hailing distances of the sea and rivers in the north of Iran that necessitates the establishment of fishways consistent with the environmental demands and standards. The installation of rubber dams near the sea blocked the fishermen crossing over the river and thus created social tensions. Canoefishways are such innovative ideas that are completely consistent with the environmental conditions in which brushes like artificial weeds and grasses are used to create energy dissipation. Since the brushes have a good bending radius, they allow small fishing boats to pass through the canals. In this study, three different experimental models of this type of fishways was conducted for different slopes and discharges. The results of the physical model analysis showed that the establishment of plant coverage in the canal, the average flow velocity was reduced by 70%. By increasing the flow discharge up to the submergence, the Manning coefficient increases and it showed a decrease when it submerged completely. The maximum Manning coefficient occurs at the base of submerging which are 0.16, 0.136 and 0.071 at first, second and third arrangements, respectively. Moreover, the dimensionless relationship for determining the Manning coefficients was provided for the first and second arrangements of the submerged brush conditions.
Authors and Affiliations
Hoda Hedayati - Mohsen Masoudian - Rohollah Ehsani
Keywords
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