Twenty-nine months of geomorphic change in upper Monterey Canyon (2002–2005) |
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| Institution: | 1. Université Côte d''Azur, OCA, CNRS, IRD, Géoazur UMR 7329, 250 rue Albert Einstein, Sophia Antipolis, 06560 Valbonne, France;2. Université Montpellier II, Laboratoire Géosciences Montpellier UMR 5243, Place Eugene Bataillon, 34095 Montpellier cedex 5, France;3. Sorbonne Universités, UPMC Univ Paris 06, 4 place Jussieu, 75252 Paris cedex 05, France;1. Institut de Ciències del Mar (CSIC), Passeig Marítim de la Barceloneta, 37-49, 08003 Barcelona, Spain;2. Fisheries and Oceans Canada, Bedford Institute of Oceanography, P.O. Box 1006, Dartmouth, Nova Scotia B2Y 4A2, Canada;3. Geological Survey of Canada (Atlantic), Bedford Institute of Oceanography, P.O. Box 1006, Dartmouth, Nova Scotia B2Y 4A2, Canada;4. Prescott and Zou Consulting, 6 Glenn Dr., Halifax, Nova Scotia B3M 2B9, Canada;1. Geohazards and Earth Processes Research Group, Faculty of Engineering, University of Nottingham, Nottingham NG7 2RD, UK;2. Department of Civil and Environmental Engineering, Imperial College London, London SW7 2AZ, UK;3. School of Mechanical, Aerospace and Civil Engineering, University of Manchester, Manchester M13 9PL, UK;1. Bureau of Economic Geology, Jackson School of Geosciences, The University of Texas at Austin, Austin, TX, USA;2. Computational Science Research Center, San Diego State University, San Diego, CA, USA;3. Monterey Bay Aquarium Research Institute, Moss Landing, CA, USA;4. Chevron Energy and Technology Company, 1500 Louisiana, Houston, TX, USA;5. Statoil, Research Center, Austin, TX, USA;1. School of Ocean and Earth Science, University of Southampton, National Oceanography Centre, European Way, Southampton, SO14 3ZH, UK;2. National Oceanography Centre, European Way, Southampton, SO14 3ZH, UK |
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| Abstract: | Time serial multibeam bathymetry is used to evaluate geomorphic trends and submarine processes in the upper 4 km of Monterey Canyon, California. Seven high-resolution bathymetric surveys conducted between September 2002 to February 2005 show that the upper canyon axis and head grew in volume 1 000 000 m3 ± 700 000 m3, at an average annual rate of 400 000 m3/a ± 300 000 m3/a through lateral erosion and vertical incision. This net loss of substrate during the 29-month period is parsed between local erosion of 1 400 000 m3 and local deposition of 350 000 m3. A submarine landslide with a scar void volume of 70 000 m3 and debris pile of 52 000 m3 occurred between March 2003 and September 2004. During the subsequent months until February 2005, the slide scar grew 40% in volume while the debris pile shrank by 80%. The canyon-head rim adjacent to Moss Landing Harbor prograded seaward and retreated shoreward significantly (up to 50 m) during the study suggesting frequent episodes of sediment build up and subsequent down-canyon failure. A large field of sand waves located in the channel axis was completely reworked in each time series except for a 24 h period where no wave crest movement was noted, and a 32 day period where up-canyon migration of approximately 7 m was recorded in the northern tributary. |
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