Abstract Sedimentation under variable shear stress at lower reach of the Rupnarayan River, West Bengal, India
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Sedimentation under variable shear stress at lower reach of the Rupnarayan River, West Bengal, India

机译：印度西孟加拉邦鲁普纳拉扬河下游可变剪应力作用下的泥沙沉积

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Abstract The lower reach of the Rupnarayan River has been deteriorated and incapacitated due to continuous sedimentation (26.57millionm3 shoaling in last 25 years). Attempts have been made to explain the causes and mechanisms of sedimentation in connection to the seasonal fluctuation of shear stress. River depth and water velocity was measured by echo-sounder and current meter respectively. Textural analysis of grains was done by sieving technique. Available and critical shear stress (N/m2) have been calculated following Du Boys (1879), Shield (1936) and Van Ledden (2003) formula. The lack of available energy to transport a particular grain size during low tide (in dry season) is the main reason behind the rapid sedimentation in this area. Most of the places (75%) having negative deviation of shear stress (available shear stress lesser than critical shear stress), during low tide are characterized by deposition of sediments. The presence of mud (silt and clay) above the critical limit (15%) in some of the sediment samples generates the cohesive property, restricts sediments entrainment and invites sedimentation.
机译： 摘要 鲁普纳拉扬河的下游由于不断的沉积而恶化和丧失了能力（26.57 百万 m 3 最近25年的暗流）。试图解释与剪切应力的季节性波动有关的沉降的原因和机理。用回声测深仪和水表分别测量河水深度和水速。谷物的质地分析是通过筛分技术完成的。根据Du Boys（1879），Shield（1936）和Van Ledden（2003）公式计算了可用的和临界剪切应力（N / m 2 ）。退潮期间（干旱季节）缺乏有效的能量来运输特定粒度的谷物是该地区快速沉积的主要原因。在退潮期间，大多数具有剪应力负偏差（可用剪应力小于临界剪应力）的地方（> 75％）以沉积物沉积为特征。在某些沉积物中，泥（淤泥和黏土）的含量超过临界限值（15％）会产生内聚性，限制沉积物的夹带并引起沉积。

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