Floods are the most common natural disasters in Malaysia and have damaged structures, infrastructures, crops and even causes fatalities. It may also lead to erosion and sedimentation in rivers and this will result to complex river behaviour. A hydraulic laboratory experimental study was carried out. Also, flood flow and sediment transport in straight compound channels involving flow resistance, distribution of depth-averaged velocity, stream-wise vorticity patterns, channel bed morphology and bed load transport rate in non-vegetated compound straight mobile bed channels were investigated. The finding showed that the Darcy Weisbach friction factor f increased by 40% and 54% for floodplain and main channel, respectively when relative flood flow depth increase from 0.30 to 0.50. The small bed load transport rates of 0.09 g/s and 0.03 g/s for shallow and deep overbank flows, respectively were measured due to effect of very gentle or mild channel bed slope which was fixed at a gradient of 0.1%.
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机译：洪水是马来西亚最常见的自然灾害，其结构，基础设施，农作物受损甚至导致死亡。它还可能导致河流的侵蚀和沉淀，这将导致复杂的河流行为。进行了水力实验室实验研究。此外，还研究了非植被复合平直移动河床中直流复合河道中的洪水和泥沙运移，涉及流阻，深度平均速度分布，水流涡度分布，河床形态和河床负荷输运速率。研究结果表明，当相对洪水深度从0.30增加到0.50时，滩区和主河道的达西·魏斯巴赫摩擦系数f分别增加40％和54％。由于非常平缓的通道床坡度（固定在0.1％的坡度）的影响，分别测量了浅层和深层过水流量的小床荷载输运速率，分别为0.09 g / s和0.03 g / s。
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