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| Titel |
A study of meteorologically and seismically induced water level and water temperature oscillations in an estuary located on the west coast of India (Arabian Sea) |
| VerfasserIn |
P. Mehra, R. G. Prabhudesai, A. Joseph, V. Kumar, Y. Agarvadekar, R. Luis, B. Viegas |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 12, no. 5 ; Nr. 12, no. 5 (2012-05-21), S.1607-1620 |
| Datensatznummer |
250010824
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| Publikation (Nr.) |
 copernicus.org/nhess-12-1607-2012.pdf |
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| Zusammenfassung |
| The study examines the observed storm-generated sea-level oscillations (June
2007 and November 2009) along with the Sumatra geophysical tsunami
(September 2007), indicating similarities in the sea-level response in the
Mandovi estuary of Goa in the eastern Arabian Sea. Sea-level and surface
meteorological measurements collected during storms exhibit strong synoptic
disturbances leading to the coherent oscillations in the estuary with
significant energy bands centred at periods of 24, 45, and 80 min. In
particular, during the sporadic atmospheric event of June 2007, the
atmospheric pressure dipped by ~12 mb, the wind direction stabilized
to ~249° with peak wind speed up to 16 m s−1 and the positive
sea-level surge swelled up by ~40 cm. Also, the water temperature
cooled down by ~4.5 °C. Approximately 3 days prior to the 12
September 2007 Sumatra earthquake, the water temperature at Verem station
started exhibiting a distinctly stronger semidiurnal oscillation (with a
relatively larger variance of ~17.9 °C2 in contrast to a
lesser variance of ~12 °C2 during the preceding normal days)
and these well-defined oscillations continued to manifest for a week
after the earthquake. The pre-earthquake enhanced seawater temperature
oscillations observed at this tropical estuary provides an indication that
routine monitoring of seawater temperature from tropical estuaries with fine
temporal resolution may provide early information about impending coastal
earthquakes. |
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