Design of Hydraulic Outlets Fish ladder Based on Hydrological and Hydraulic Uncertainties

Document Type : Research Paper

Authors

• m. Nezhad Naderi
• M. J. Fadaee
• R. Montazami Vazifehdoust

Abstract

Diversion dams prevent fish migration along rivers. Fish ladder is an appurtenance of a dam, which facilitates fish migration. Therefore, the environmental problem as result of the construction of dams is controlled by adding a flexible fish ladder, which contains an adjustable outlet for the fluctuating water levels. A fish ladder outlet is an overflow type outlet with free flow in the side channel, which is embedded perpendicular to the fish ladder. Wide fluctuations in the river flow affect the performance of the fish passage and can cause the fish ladder not to function as it was expected. The mean first order second moment (MFOSM) method was used to analyze the uncertainty of the water level profile and the crest elevation of the fish passage outlet. The optimal design of that structure was the result of applying this method.    

Keywords

• Risk
• Reliability
• flexible fish ladder
• hydrological uncertainty
• hydraulic uncertainty

20.1001.1.20086377.1394.8.26.2.2

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References

1. حسینی، م. و ج.، ابریشمی. 1383. "هیدرولیک نهرهای باز،"انتشارات دانشگاه امام رضا(ع)، مشهد.
2. دفتر مطالعات آب و محیط زیست شریف (EWRC).1380، طرح هیدرودینامیک رودخانه سیستان،" گزارش فنی.
3. کایت، ج. دبلیو. 1369 ”تحلیل فراوانی وقایع و خطرکردن در هیدرولوژی“. ترجمه: دکتر ابوالقاسم بزرگ نیا، دکتر امین علیزاده، دکتر محمود نقیب زاده، مهندس حمید خیابانی، انتشارات آستان قدس رضوی.
   1. Denil, G. 1909. Les eachelles a poisons et leur application aux barrages de Meuse et d' Ourthe, Annales des Travaux Publics de Belgique.
   2. McLeod, A. M., and P. Nemenyi, 1939–1940. An investigation Fishways, Univ of Iowa, Stud. Eng. Bull. No. 24. 63 p.
   3. Zeimer, G. L. 1962. Steeppass fishway development. Alaska Dept. Fish and Game Inf. Leafl. No. 12.  27 pp.
   4. Industry and investment. Primary industries fishing and aquaculture. Available from:http:// www.dip.nsw.gov.au/fisheries/habit/rehabilitating/fishways.htm.
   5. Tung, Y.K., and L.W. Mays.1980. “Risk analysis for hydraulic design.” J Hydraul Eng., ASCE, 106: 893-913.
   6. Hydrologic Engineering Center (HEC), 1986 “Accuracy of computed water surface profiles”. Research Document 26. U.S. Army Corps of Engineers, Davis. CA.
   7. Oegema, B.W., and E.A. McBean. 1987. Uncertainties in flood plain mapping. Application of frequency and risk in water resources, V.P. Singh. (ed). D. Reidel Publishing Co., Dordrecht, The Netherlands. p 293-303.
   8. Mays, L.W. 1999. Hydraulic design handbook. McGraw-Hill, 1999.
   9. Kapopodis, C., and N. Rajaratnam, 1983. Hydraulics of Denil fishway. J. Hydraul Eng. ASCE,113:670-674
   10. Katopodis, C. 1981. Consideration in the design of fishways for freshwater species. Proc., 5^th Can. Hydrotech. Conf., Can Soc Civil Eng. P. 857- 887.