Large internal waves in Massachusetts Bay transport sediments offshore


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dc.contributor.author Butman, Bradford
dc.contributor.author Alexander, P. Soupy
dc.contributor.author Scotti, Alberto
dc.contributor.author Beardsley, Robert C.
dc.contributor.author Anderson, Steven P.
dc.date.accessioned 2007-05-11T16:21:59Z
dc.date.available 2007-05-11T16:21:59Z
dc.date.issued 2006-09-26
dc.identifier.citation Continental Shelf Research 26 (2006): 2029-2049 en
dc.identifier.uri http://hdl.handle.net/1912/1625
dc.description This paper is not subject to U.S. copyright. The definitive version was published in Continental Shelf Research 26 (2006): 2029-2049, doi:10.1016/j.csr.2006.07.022. en
dc.description.abstract A field experiment was carried out in Massachusetts Bay in August 1998 to assess the role of large-amplitude internal waves (LIWs) in resuspending bottom sediments. The field experiment consisted of a four-element moored array extending from just west of Stellwagen Bank (90-m water depth) across Stellwagen Basin (85- and 50-m water depth) to the coast (24-m water depth). The LIWs were observed in packets of 5–10 waves, had periods of 5–10 min and wavelengths of 200–400 m, and caused downward excursions of the thermocline of as much as 30 m. At the 85-m site, the current measured 1 m above bottom (mab) typically increased from near 0 to 0.2 m/s offshore in a few minutes upon arrival of the LIWs. At the 50-m site, the near-bottom offshore flow measured 6 mab increased from about 0.1 to 0.4–0.6 m/s upon arrival of the LIWs and remained offshore in the bottom layer for 1–2 h. The near-bottom currents associated with the LIWs, in concert with the tidal currents, were directed offshore and sufficient to resuspend the bottom sediments at both the 50- and 85-m sites. When LIWs are present, they may resuspend sediments for as long as 5 hours each tidal cycle as they travel westward across Stellwagen Basin. At 85-m water depth, resuspension associated with LIWs is estimated to occur for about 0.4 days each summer, about the same amount of time as caused by surface waves. en
dc.description.sponsorship MBIWE98 was supported by the USGS and the Office of Naval Research (ONR). The long-term observations at LT-A and LT-B were conducted under a Joint Funding Agreement between the USGS and the Massachusetts Water Resources Authority and an Inter-Service Agreement with the US Coast Guard. A. Scotti received support from the WHOI Postdoctoral Scholar program, the Johnson Foundation, the USGS, and ONR through grant N00014-01-1-0172; R. Beardsley through ONR grants N00014-98-1-0059, N00014-00-1-0210 and the WHOI Smith Chair in Coastal Physical Oceanography; and S. Anderson through ONR grant N000140-97-1-0158. en
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.publisher Elsevier B.V. en
dc.relation.uri http://dx.doi.org/10.1016/j.csr.2006.07.022
dc.subject Internal waves en
dc.subject Sediment transport en
dc.subject Massachusetts Bay en
dc.subject Stellwagen Bank en
dc.title Large internal waves in Massachusetts Bay transport sediments offshore en
dc.type Article en
dc.identifier.doi 10.1016/j.csr.2006.07.022

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