Experimental study of pressure flushing of non-cohesive sediment through slotted pipe bottom outlet
نویسندگان
چکیده
ABSTRACT Among several techniques for prevention and mitigation of reservoir sedimentation, bottom outlets arise as a means removing sediment deposited close to the dam. Given reduced removal provided by traditional under pressure flushing conditions, this article proposes new type structure that aims increase in direction parallel dam axis. An experimental installation was employed evaluate its operation function variation diameter flow characteristics. Through analysis bathymetry generated structure, dimensionless relation predicting scour pit length obtained, presenting good fitness data.
منابع مشابه
Experimental and Numerical Investigation of Bottom Outlet Hydraulic Model
Using experimental models along with conducting numerical analysis have been widely used in performance recognition and optimization of hydraulic equipments. Numerical modeling has lower cost rather than experimental one; however practical tests are commonly used because of the hydraulic structure importance especially in dams. Meanwhile numerical methods could be used for future designs throug...
متن کاملEffect the kind of sediments on Scour Cone in Pressure Flushing
The accumulation of sediments in reservoirs of dams has always been one of the problems of reservoir dams. Accordingly, one of the approaches to address this problem can be referred to as the method of pressure flushing. In this method, during the course of flushing, generally the bottom drainage outlets of the dam are opened for a certain period of time and the reservoir water level is kept al...
متن کاملstudy of cohesive devices in the textbook of english for the students of apsychology by rastegarpour
this study investigates the cohesive devices used in the textbook of english for the students of psychology. the research questions and hypotheses in the present study are based on what frequency and distribution of grammatical and lexical cohesive devices are. then, to answer the questions all grammatical and lexical cohesive devices in reading comprehension passages from 6 units of 21units th...
One dimensional simulation of flushing sediment through reservoirs
Control of sedimentation in reservoirs of dams is considered to be one of the most important issues in exploitation of dams and increasing their useful life. Reservoirs act as traps for sediments and prevent transport of sediments to the river. The deposited sediments will decrease the capacity of the reservoirs so that they cannot be in use any more. Various methods are discussed in this study...
متن کاملبررسی تأثیر نوع رسوبات و تغییر فرم خروجی تخلیه کننده تحتانی با به‌کارگیری سازه نیم‌استوانه بر حفره رسوب‌شویی به کمک مدل فیزیکی
In a pressure flushing method, when the water is discharged from the bottom outlet, after a period of flushing, a flushing cone will be formed at the front of the bottom outlet; the dimension of this cone is affected by several parameters such as outlet discharge flow, water depth of reservoir, and the kind of sediments accumulated in the reservoir. In this study, for the effect of cohesive & n...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: RBRH
سال: 2021
ISSN: ['2318-0331', '1414-381X']
DOI: https://doi.org/10.1590/2318-0331.262120200076