{"title":"Theoretical and Analytical Approaches for Investigating the Relations between Sediment Transport and Channel Shape","authors":"Nidal Hadadin","country":null,"institution":"","volume":48,"journal":"International Journal of Civil and Environmental Engineering","pagesStart":375,"pagesEnd":381,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/11928","abstract":"This study investigated the effect of cross sectional\r\ngeometry on sediment transport rate. The processes of sediment\r\ntransport are generally associated to environmental management,\r\nsuch as pollution caused by the forming of suspended sediment in the\r\nchannel network of a watershed and preserving physical habitats and\r\nnative vegetations, and engineering applications, such as the\r\ninfluence of sediment transport on hydraulic structures and flood\r\ncontrol design. Many equations have been proposed for computing\r\nthe sediment transport, the influence of many variables on sediment\r\ntransport has been understood; however, the effect of other variables\r\nstill requires further research. For open channel flow, sediment\r\ntransport capacity is recognized to be a function of friction slope,\r\nflow velocity, grain size, grain roughness and form roughness, the\r\nhydraulic radius of the bed section and the type and quantity of\r\nvegetation cover. The effect of cross sectional geometry of the\r\nchannel on sediment transport is one of the variables that need\r\nadditional investigation. The width-depth ratio (W\/d) is a\r\ncomparative indicator of the channel shape. The width is the total\r\ndistance across the channel and the depth is the mean depth of the\r\nchannel. The mean depth is best calculated as total cross-sectional\r\narea divided by the top width. Channels with high W\/d ratios tend to\r\nbe shallow and wide, while channels with low (W\/d) ratios tend to be\r\nnarrow and deep. In this study, the effects of the width-depth ratio on\r\nsediment transport was demonstrated theoretically by inserting the\r\nshape factor in sediment continuity equation and analytically by\r\nutilizing the field data sets for Yalobusha River. It was found by\r\nutilizing the two approaches as a width-depth ratio increases the\r\nsediment transport decreases.","references":null,"publisher":"World Academy of Science, Engineering and Technology","index":"Open Science Index 48, 2010"}