Large internal waves in Massachusetts Bay transport sediments offshore
Alexander, P. Soupy
Beardsley, Robert C.
Anderson, Steven P.
MetadataShow full item record
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.
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.
Suggested CitationArticle: Butman, Bradford, Alexander, P. Soupy, Scotti, Alberto, Beardsley, Robert C., Anderson, Steven P., "Large internal waves in Massachusetts Bay transport sediments offshore", Continental Shelf Research 26 (2006): 2029-2049, DOI:10.1016/j.csr.2006.07.022, https://hdl.handle.net/1912/1625
Showing items related by title, author, creator and subject.
Cacchione, David A. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1970-09)A series of laboratory experiments were conducted in a glass wave tank to investigate the propagation of internal gravity waves up a sloping bottom in a fluid with constant Brunt-Vaisala frequency. Measurements of the ...
Three-dimensional acoustic propagation through shallow water internal, surface gravity and bottom sediment waves Shmelev, Alexey A. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2011-09)This thesis describes the physics of fully three-dimensional low frequency acoustic interaction with internal waves, bottom sediment waves and surface swell waves that are often observed in shallow waters and on continental ...
Prediction of continental shelf sediment transport using a theoretical model of the wave-current boundary layer Goud, Margaret R. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1987-09)This thesis presents an application of the Grant-Madsen-Glenn bottom boundary layer model (Grant and Madsen, 1979; Glenn and Grant, 1987) to predictions of sediment transport on the continental shelf. The analysis is a ...