Perigean spring tides along the Indian coast

IF 1.1 4区综合性期刊 Q3 MULTIDISCIPLINARY SCIENCES

Current Science Pub Date : 2022-10-25 DOI:10.18520/cs/v123/i8/1050-1053

A. Unnikrishnan

引用次数: 0

Abstract

Sea level measurements from tide-gauges, installed in harbours along the Indian coast by the Survey of India, are used to illustrate the differences in high tides during spring tides that occurred during lunar perigee and apogee (closest and farthest position of the moon in its elliptical orbit around the earth) in January and August 1974 respectively. The difference in maximum tidal heights between 9 January and 4 August of the year for Mumbai tidal record is about 87 cm, whereas for Chennai, Visakhapatnam and Paradip, the differences vary between 20 and 25 cm. Kochi record shows a difference of about 13 cm, whereas the difference in predicted high tides at Bhavnagar is more than 1 m. Similar results are found for March and April 1980 during spring tides close to perigee and apogee respectively. Perigean spring tides can cause flooding in low-lying coastal areas along the northern parts of the Indian coast, which will get enhan-ced in future with mean sea-level rise due to global war-ming.

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沿印度海岸的近岸大潮

由印度测量站在印度沿岸港口安装的潮汐计测量的海平面，分别用于说明1974年1月和8月在月球近地点和远地点(月球在其椭圆轨道上的最近和最远位置)发生的春潮期间涨潮的差异。1月9日至8月4日，孟买潮汐记录的最高潮位差约为87厘米，而金奈、维沙卡帕特南和帕拉迪普的潮位差在20至25厘米之间。高知记录显示的差异约为13厘米，而巴夫纳加尔预测的涨潮差异超过1米。1980年3月和4月分别在近地点和远地点附近的大潮中发现了类似的结果。远海大潮可能会导致印度海岸北部低洼沿海地区的洪水泛滥，未来由于全球战争导致的平均海平面上升，这种情况将会加剧。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Current Science 综合性期刊-综合性期刊

CiteScore

1.50

自引率

10.00%

发文量

审稿时长

3 months

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