مقایسه رسوب معلق ورودی به آبگیر با تغییر زاویه دیواره کانال اصلی از قائم به ۴۵ درجه

Abstract

Abstract Lateral intake is a hydraulic structure which is used for diversion of some portion of water from a river for the purpose of irrigation, storage and industrial. Most of lateral intakes from canal are installed at canal with inclined banks which has not received the attention of the researchers in the past. Since the flow discharge and sediment which enters the intake canal depends on the flow patterns at the head of the intake and the inclined banks can affect the flow patterns and so the sediments, this study has been conducted. In this study a series of experimental tests are conducted using canal of vertical bank and a series of tests with canal of inclined banks. In all tests the suspended sediment feed with a constant concentration upstream of the intake. Sediments which enter the intake canal were collected after each test and weighted. Using dimensional analysis a general non-dimensional relation was developed. By applying the experimental data it was found that the flow patterns at the upstream of the intake has been modified in such a way that more water from surface layers are diverted. Therefore less suspended sediment enters the intake. Also it was found that in all tests the amount of sediment enters the intake reaches its minimum value at Froude number equal 0.37. In low flow depth because of the effect of bed roughness, the suspended sediment enters the intake is higher compare to the higher flow depth for the same conditions. Keywords: Lateral intake, Suspended load, Inclined banks, Sediment delivery ratio