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Register a new userFactors Affecting Scour Downstream Hydraulic Structures Due to Water Jet, Laboratory Study
دراسة مختبرية للعوامل المؤثرة في النحر الناتج من ارتطام بثق الماء في حوض مذب مائي
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تُستخدم أحواض التهدئة في المنشآت الهيدروليكية لتشتيت الطاقة الهيدروليكية الناتجة عن إطلاق التصاريف ذات السرع العالية من هذه المنشآت إلى مجرى النهر، و تتسبب هذه التصاريف –عادة- بحدوث مشكلات نحر في أرضية حوض التهدئة. إن شكل حفر النحر الحاصلة و عمقها لا يمكن تحديده بشكل دقيق و ذلك لكثرة المتغيرات المؤثرة في عملية النحر هذه، و لأهمية هذا الموضوع أجريت دراسات و بحوث عديدة نظرية و تطبيقية لتحديد أبعاد مشكلات النحر الحاصلة أسفل المنشات الهيدروليكية.
Plunge pools are economic means to dissipate hydraulic energy of high speed flows. Plunge pools are usually at the end of either spillways or bottom outlets. The flood discharge is directed into an air water jet and travels through the atmosphere and eventually strikes the plunge pool in which the hydraulic energy is dissipated. Many scour problems result from those free falling jets downstream of the hydraulic structures. In recent years various researchers have investigated scour problems downstream hydraulic structure such as spillways and bottom outlets and numbers of empirical and semi-empirical equations have been developed for predicting the length and depth of scour hole resulting from the jet.
References used
George W.Annadale, Rodney Wittler and Greg A.Scott, "Scour downstream of dams", Symposium on scour of foundations, International Society of Soil Mech. And Geotechnical Engineering, Melbourne, Australia, Nov. 19,2000
A.Melih Yanmaz, "Reliability Simulation of Scouring Downstream of Outlet Facilities", Turkish J. of Eng. Env. Sci. Turkey, No. 27, 2003
Federal Energy Regulatory Commission, Division of Dam Safety and inspection, "Engineering guide Lines for the Evaluation of Hydropower Projects",Chapter 11, Washington, Dc 204026, October 1999
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