Journal of Food, Agriculture and Environment

Investigation of hydraulics of flow in bottom intake structures by software modeling

Author(s):

Amir Abbas Kamanbedast *, Alireza Masjedi, Ali Assareh

Recieved Date: 2012-02-28, Accepted Date: 2012-05-06

Abstract:

Bottom intake is an intake structure which can be considered an alternative for regular intakes in mountain streams. It is especially suitable for small hydro-power. Low construction cost, simple structure, less maintenance cost and only intake which can divert 100 percent of river water are advantage of this structure. Bottom intake consists of low high spillway built along the river bed. A canal is constructed downstream in the main body of the spillway to collect the water and transport it to one side of the river. On the top of the canal, a mesh consisted of parallel steel bars is considered; so the river bed sediment cannot enter inside the channel. The most important part of the structure is the design of the area of the opening and the slope of the downstream face of the spillway. In this study to develop relationships for the discharge coefficient, many different physical models were constructed in a flume of 60 cm width  and 8 m length. These models were tested under different flow conditions. The results showed that for small slope the sediment can trap between the screen bars and reduces the area opening. The sediment to trap is reduced by increasing the slope and the flow depth over the screen and thus also the flow discharge are reduced. However, it was found that at slope of 30 degree, diverted flow discharge is high and diverted sediment is low. In this study, new equation was developed for discharge coefficient. 

Keywords:

Bottom intake, track, screen, small hydropower, discharge coefficient

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Journal: Journal of Food, Agriculture and Environment
Year: 2012
Volume: 10
Issue: 2
Category: Environment
Pages: 776-780

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