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首页> 外文期刊>Irrigation and Power Journal >ESTIMATION OF SILT CONCENTRATION DOWNSTREAM OF CONTEMPLATED CLOSURE OF SAPTAMUKHI ESTUARY AND ITS APPLICATION
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ESTIMATION OF SILT CONCENTRATION DOWNSTREAM OF CONTEMPLATED CLOSURE OF SAPTAMUKHI ESTUARY AND ITS APPLICATION

机译：SAPMUKHI河口关闭时淤泥浓度下降的估算及其应用

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There is a project (Sundarbans Delta Project Phase-I) to close the Saptamukhi river at about 19 km upstream of the Seaface (i.e. 1 km upstream of the Namkhana Creek junction with the Saptamukhi West Gully) with an enclosure dam connected by encirclingmarginal dykes on either side for protection of the inland from saline water inundation by abnormal tidal waves and storm surges. Detailed investigation had been carried out with the help of one dimensional mathematical model to study the flow pattern after closure under different tidal conditions, viz. the spring mean and neap tides (NEDECO 1964). The existing navigation route in continuation of the Namkhana Creek is first up the West Gully upto the bifurcation point and then down the East Gully roundthe Prentice Island and then up the Walsh Creek (vide Figure 1). The velocities in the reaches downstream of the closure would undergo some reduction due to the closure, Basu (1978). This reduction would be more (70 to 90%) in the reaches immediate downstream of the closure. Due to the closure the silt concentration immediately downstream of the closure may change. In the present communication an effort has been made to estimate the silt concentration parameter at downstream of contemplated closure anduse the same to compute probable annual volumes of siltation in the vulnerable reaches (region where the velocity after closure would decrease considerably). Silt concentration of an estuarine river varies primarily with the strength of tide, i.e., phase of the moon. During spring tides, concentration becomes maximum and during neap tides it becomes minimum having intel-mediate value during mean times. In the existing situation the silt concentration for different phases of the moon may be ascertainedthrough field observations. Silt concentration after closure may also be known through measurement in the prototype. But silt concentration in the contemplated post-closure situation can not be measured as no such condition exists in prototype. Silt concentration parameter in such a situation has been estimated with the help of the results obtained from mathematical model study.
机译：有一个项目（Sundarbans三角洲项目一期），在海面上游约19公里处（即，南卡纳河与西塔蓬库西河谷交界处的上游1公里处），通过围堰围堵大坝来封闭萨塔坡河。防止内陆遭受异常潮汐和风暴潮淹没盐水。借助一维数学模型进行了详细的研究，以研究在不同潮汐条件下闭合后的水流模式。春天的平均潮和潮汐（NEDECO 1964）。沿Namkhana Creek延伸的现有航路首先是从西沟到分岔点，然后是沿东沟到普伦蒂斯岛，然后是沃尔什河（参见图1）。 Basu（1978）指出，由于封闭作用，封闭作用下游河段的流速会有所降低。在关闭的下游，这种减少会更大（70％到90％）。由于封闭物，紧邻封闭物下游的淤泥浓度可能会改变。在本通信中，已做出努力来估计预期关闭区下游的泥沙浓度参数，并使用该参数来计算易受影响河段（关闭后速度将大大降低的区域）中可能的年度淤积量。河口河的泥沙浓度主要随潮汐强度（即月相）而变化。在春季潮汐期间，浓度变为最大，而在潮汐潮汐期间，浓度变为最小，平均时间具有中间值。在现有情况下，可以通过野外观测来确定月球不同阶段的淤泥浓度。封闭后的泥沙浓度也可以通过原型中的测量得知。但是在预期的关闭后情况下，泥沙浓度无法测量，因为原型中不存在这种情况。在这种情况下的泥沙浓度参数已借助数学模型研究获得的结果进行了估算。

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