{"title":"Perigean spring tides along the Indian coast","authors":"A. Unnikrishnan","doi":"10.18520/cs/v123/i8/1050-1053","DOIUrl":null,"url":null,"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.","PeriodicalId":11194,"journal":{"name":"Current Science","volume":"34 1","pages":""},"PeriodicalIF":1.1000,"publicationDate":"2022-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Current Science","FirstCategoryId":"103","ListUrlMain":"https://doi.org/10.18520/cs/v123/i8/1050-1053","RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"MULTIDISCIPLINARY SCIENCES","Score":null,"Total":0}
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.
期刊介绍：
Current Science, published every fortnight by the Association, in collaboration with the Indian Academy of Sciences, is the leading interdisciplinary science journal from India. It was started in 1932 by the then stalwarts of Indian science such as CV Raman, Birbal Sahni, Meghnad Saha, Martin Foster and S.S. Bhatnagar. In 2011, the journal completed one hundred volumes. The journal is intended as a medium for communication and discussion of important issues that concern science and scientific activities. Besides full length research articles and shorter research communications, the journal publishes review articles, scientific correspondence and commentaries, news and views, comments on recently published research papers, opinions on scientific activity, articles on universities, Indian laboratories and institutions, interviews with scientists, personal information, book reviews, etc. It is also a forum to discuss issues and problems faced by science and scientists and an effective medium of interaction among scientists in the country and abroad. Current Science is read by a large community of scientists and the circulation has been continuously going up.
Current Science publishes special sections on diverse and topical themes of interest and this has served as a platform for the scientific fraternity to get their work acknowledged and highlighted. Some of the special sections that have been well received in the recent past include remote sensing, waves and symmetry, seismology in India, nanomaterials, AIDS, Alzheimer''s disease, molecular biology of ageing, cancer, cardiovascular diseases, Indian monsoon, water, transport, and mountain weather forecasting in India, to name a few. Contributions to these special issues ‘which receive widespread attention’ are from leading scientists in India and abroad.
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