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Parameterization of rain induced surface roughness and its validation  study using a third generation wave model
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL. (meteorologi, awep)
Department of Ocean Engineering & Naval Architecture, Indian Institute of Technology.
Space Physics Laboratory, Vikram Sarabhai Space Centre.
2009 (English)In: Ocean Science Journal, Vol. 44, no 3, 125-143 p.Article in journal (Refereed) Published
Abstract [en]

The effect of raindrops striking water surface and their role in modifying the prevailing sea-surface roughness is investigated. The work presents a new theoretical formulation developed to study rain-induced stress on sea-surface based on dimensional analysis. Rain parameters include drop size, rain intensity and rain duration. The influences of these rain parameters on young and mature waves were studied separately under varying wind speeds, rain intensity and rain duration. Contrary to popular belief that rain only attenuates surface waves, this study also points out rain duration under certain condition can contribute to wave growth at high wind speeds. Strong winds in conjunction with high rain intensity enhance the horizontal stress component on the sea-surface, leading to wave growth. Previous studies based on laboratory experiments and dimensional analysis do not account for rain duration when attempting to parameterize sea-surface roughness. This study signifies the importance of rain duration as an important parameter modifying sea-surface roughness. Qualitative as well quantitative support for the developed formulation is established through critical validation with reports of several researchers and satellite measurements for an extreme cyclonic event in the Indian Ocean. Based on skill assessment, it is suggested that the present formulation is superior to prior studies. Numerical experiments and validation performed by incorporating in state-of-art WAM wave model show the importance of treating rain-induced surface roughness as an essential pre-requisite for ocean wave modeling studies.

Place, publisher, year, edition, pages
2009. Vol. 44, no 3, 125-143 p.
Keyword [en]
ain, sea-surface roughness, waves, WAM model, validation
National Category
Oceanography, Hydrology, Water Resources Earth and Related Environmental Sciences
Research subject
URN: urn:nbn:se:uu:diva-140085DOI: 10.1007/s12601-009-0012-5OAI: oai:DiVA.org:uu-140085DiVA: diva2:382896
Available from: 2011-01-03 Created: 2011-01-03 Last updated: 2013-03-12Bibliographically approved

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