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  • Kumar, R. RajeshUppsala universitet,Luft-, vatten- och landskapslära,meteorologi, awep (author)

Parameterization of rain induced surface roughness and its validation  study using a third generation wave model

  • Article/chapterEnglish2009

Publisher, publication year, extent ...

  • 2010-01-07
  • Springer Science and Business Media LLC,2009
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:uu-140085
  • https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-140085URI
  • https://doi.org/10.1007/s12601-009-0012-5DOI

Supplementary language notes

  • Language:English
  • Summary in:English

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  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • 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.

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Added entries (persons, corporate bodies, meetings, titles ...)

  • Kumar, B. PrasadDepartment of Ocean Engineering & Naval Architecture, Indian Institute of Technology (author)
  • Subrahamanyam, D. BalaSpace Physics Laboratory, Vikram Sarabhai Space Centre (author)
  • Uppsala universitetLuft-, vatten- och landskapslära (creator_code:org_t)

Related titles

  • In:Ocean Science Journal: Springer Science and Business Media LLC44:3, s. 125-1431738-5261

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