Author(s): Seongwook Choi; Jinhwi Lee; Sung-Uk Choi
Linked Author(s): Sung-Uk Choi
Keywords: Lateral distribution method; Sediment transport; Bedload; Suspended load; Mixture effect
Abstract: The lateral distribution method is based on the force balance between gravity, bottom friction, lateral shear, and secondary flows in a cross section. With the assumption of uniform flow, the solution of the method results in the distribution of the depth-averaged velocity, and the distributions of the bottom friction and lateral shear are obtained from the velocity distribution. In the present study, the lateral distribution method is applied to predictions of total sediment load in the river. Einstein partition is used to separate the impact of the bedform in the total shear stress. Bedload and suspended load are estimated separately. That is, two types of bedload formulas are used and compared. Rousean distribution is assumed with entrainment function proposed by Wright and Parker (2004). Total sediment load in the Han River, Korea is predicted. Predicted sediment loads are compared not only with measured data but also with those from the one-dimensional approach. The impacts of effective roughness height and mixture effect are presented and discussed.