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A walk down the Cap de Creus canyon, Northwestern Mediterranean Sea: Recent processes inferred from morphology and sediment bedforms 5
Lastras, G; Canals, M; Urgeles, R; Amblas, D; Ivanov, M; Droz, Laurence; Dennielou, Bernard; Fabres, J; Schoolmeester, T; Akhmetzhanov, A; Orange, D; Garcia Garcia, A.
The Cap de Creus canyon, northwestern Mediterranean Sea, belongs to a complex network of submarine canyons cutting the western Gulf of Lion continental shelf and opening into the larger Sete canyon. Swath bathymetry data, MAKAM deep-towed side-scan sonar imagery and 5 kHz high resolution seismic reflection profiles show striking morphologies in the Cap de Creus canyon floor and walls. As a consequence of the canyon head and the upper reach severe incision, the continental shelf dramatically narrows in front of the Creus Cape promontory. The upper canyon has a flat-bottomed thalweg incised in a megascale sediment furrow field displaying hyperbolic seismic facies. The tens of kilometres long linear furrows extend also over the middle canyon down to 1400 in...
Tipo: Text Palavras-chave: Gulf of Lion; Bedform; Swath bathymetry; Side scan sonar; Submarine canyon.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-3602.pdf
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Eivissa slides, western Mediterranean Sea: morphology and processes 5
Lastras, Galderic; Canals, M; Amblas, D; Ivanov, M; Dennielou, Bernard; Droz, Laurence; Akhmetzhanov, A.
After obtaining full-coverage swath bathymetry data in 1995 and very high-resolution acoustic profiles in 2002, four slides at the Balearic Margin of the Eivissa Channel in the western Mediterranean Sea were revisited in 2004 when side-scan sonar data were collected using a MAK-1M deep-towed acoustic system. These new findings, higher in resolution than those for the swath bathymetry, show two main features previously undetected within these submarine landslides: (1) a series of step-forming inclined and detached slabs oriented perpendicular to the slide movement and located in the uppermost part of the slides, and (2) arcuate regular positive ridges oriented also normal to the slide movement and located in the depositional lobes of some of the slides. The...
Tipo: Text Palavras-chave: Morphology; Bathymetry; Slides; Mediterranean sea; Eivissa channel.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-2087.pdf
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