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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Channel morphology and hydraulic geometry of River Kolong, Nagaon district, Assam, India: a study from the standpoint of river restoration
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Channel morphology and hydraulic geometry of River Kolong, Nagaon district, Assam, India: a study from the standpoint of river restoration

机译：河康康，纳格森区，印度山区河流形态与液压几何：河流恢复观点的研究

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摘要

River Kolong of Nagaon district, Assam, India has been facing serious degradation since 1964 as a result of building of an embankment across the river at its take-off point from River Brahmaputra. The river Kolong, once a thriving anabranch (distributary) of the Brahmaputra marked by its active navigability, rich biodiversity and high productivity, is presently in a moribund state. Under these circumstances, the issue of eco-hydrological restoration of the river gained added urgency among the people living in its valley. The 'natural-channel design approach' for river restoration based on the estimates of natural channel geometry and discharge is presently being applied in rivers across the globe. Adopting a similar approach in this study, based on field measurements, we determine the baseline channel dimensions (bankfull width, mean bankfull depth, bankfull cross-section, floodprone width and entrenchment ratio) across the river at four different sites, so that these parameters can be utilized in natural channel design process for restoration purpose. The study reveals that, the river is significantly entrenched with entrenchment ratio varying from 1.19 to 1.79. Moreover, bankfull discharge has also been determined and values are found to be varying from 13.85 to 918.36 cumec in the downstream direction, with an average return period of 1.7 years. The average values of 'at-a-station' hydraulic geometry exponents b, f and m are 0.22, 0.38 and 0.4 respectively, while the average values of downstream direction exponents b, f and m are found to be 0.32, 0.23 and 0.44 respectively. These values compare well with those arrived at by pioneering workers in this field and are considered useful in river restoration programmes.
机译：萨龙河康龙，印度自1964年以来，印度自1964年以来一直面临严重退化，这是在河流Brahmaputra河的起飞点的堤防。克隆河，一旦蓬勃发展的Brahmaputra繁荣的Anabranch（分销），目前处于垂死状态。在这种情况下，河流的生态水文恢复问题增加了居住在山谷中的人们的紧迫感。基于自然通道几何和放电估计的河流恢复的“自然通道设计方法”目前正在全球河流中应用。在本研究中采用类似的方法，基于现场测量，我们在四个不同网站上确定河流的基线信道尺寸（银行宽度，平均银行深度，银行横截面，洪水宽度和壕沟宽度和壕沟宽度和壕沟宽度和壕沟比例，使这些参数可用于自然通道设计过程以进行恢复目的。该研究表明，河流显着地侵入了从1.19到1.79的壕沟比率变化。此外，还确定了银行排放，并发现价值在下游方向上的13.85至918.36克里克变化，平均返回期1.7岁。 “AT-A站”液压几何指数B，F和M的平均值分别为0.22,0.38和0.4，而下游方向指数B，F和M的平均值分别为0.32,0.23和0.44 。这些值与该领域的开创性工作者到达的人相比很好，并且被认为是河流修复程序有用。

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