Flow and erosion at a bend in the braided Jamuna River
Flow and erosion at a bend in the braided Jamuna River作者机构：Department of Civil EngineeringDhaka University of Engineering and Technology Institute of Water and Flood ManagementBangladesh University of Engineering and Technology
出 版 物：《International Journal of Sediment Research》 (国际泥沙研究(英文版))
年 卷 期：2012年第27卷第4期
页 面：498-509页
核心收录：
学科分类：082802[工学-农业水土工程] 090707[农学-水土保持与荒漠化防治] 0907[农学-林学] 08[工学] 0828[工学-农业工程] 09[农学] 0815[工学-水利工程]
基 金：support by DelPHE Project and JAFS project
主 题：Braided Jamuna River Bend Flow pattern Erosion prediction model
摘 要：The braided Jamuna River frequently changes its *** the secondary channel in a braided river acts as a single thread meandering *** the present study an attempt has been made to investigate the flow patterns and to estimate the rate of bank erosion in a bend along the Jamuna *** three dimensional(3D) flow velocities were measured using Acoustic Doppler Current Profiler(ADCP).It is found that the near bank velocity is amplified by 1.1 to 1.3 times as compared with the section averaged velocity.A dominant secondary current is found in the upstream *** evolution as well as decay of the secondary current is not as clear as it is found in the laboratory *** is revealed from the analysis of the flow process that the causes of higher rate of erosion at the study bend are the oblique flow near bankline,six times amplified shear velocity than critical shear velocity near bankline and the secondary current which acts as a sediment transporting agent from the outer bank towards the inner bank or the sand *** on the flow processes,a simplified erosion prediction model is developed and applied to estimate the rate of erosion at a selected *** the predicted results have been compared with the observed data at the bend and all the available data at other bends along the Jamuna River.
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