SFML 5/22/03 5mcontour vector digital data \\46A-125-9351\D$\MBproject\Bathymetry\ContourLines\20mcontour.shp 5mcontour The head of the Monterey Submarine Canyon experiences seasonal flushing events that are hypothesized to cause large amounts of sediment settled in axis along the bottom to be moved downslope. It is believed that these dams of sediment formed along the axes of the canyon head create a habitat for a unique benthic community endemic to the sediment and debris. Information provided by this project contributes to quantitatively analyzing the magnitude of sediment transported from the head of the canyon into the deep canyon. The goals of the project proposed here are to: 1) characterize the geomorphology of the headward portion of the Monterey Submarine Canyon, 2) look for evidence consistent with the hypothesis that natural dams form before and are then lost during the winter storm season, and 3) quantify the magnitude of geomorphic changes in the canyon head between pre- and post-storm season periods. Multibeam bathymetry data was used to create pre- and post-storm, high-resolution (2-4 m horizontal posting) digital elevation models (DEMs) to detect and quantify the magnitude of these predicted sediment movement patterns. Information regarding the occurrence and quantitative effects of seasonal flushing events is needed to assess the risks and benefits associated with dumping dredge material into the Monterey Bay Canyon. The purpose of the project was to identify the overall change in the morphology of the head of Monterey Bay Submarine Canyon from 10m to 300m in depth between pre- and post-winter storm activity. Specific goals were to find evidence of sediment "dams" forming across the canyon axis and to quantify how the morphology of the canyon changes following the first storms of winter, which are believed to trigger flushing events and removal of the hypothesized dams. By determining how much sediment is transported from the canyon head into the deep canyon via seasonal flushing events, questions pertaining to the ecosystem of the canyon can be answered with increased certainty by the scientific community. Bathymetric data of the headward portion (< 300 m in depth) of the Monterey Bay Submarine Canyon were collected on three separate occasions and processed to produce a snapshot of the canyon in unprecedented detail on two separate occasions. Bathymetric data is recorded as x,y,z (latitude, longitude, depth) data points that can be used to generate depth contours and digital elevation models (DEM's) to determine volumes of deposition/erosion, wavelength/height of dams of sediment in the canyon, and the presence of hypothesized morphological features. en 9/30/02 3/25/03-3/26/03 publication date Complete None planned -121.840352 -121.788646 36.812745 36.775190 603485.218039608048.2333974070617.4568584074727.768327 multibeam seafloorhabitatmapping To be determined by SFML and contractor To be determined by SFML and contractor Rikk Kvitek Seafloor Mapping Lab, California State University Monterey Bay Director mailing and physical address
California State University Monterey Bay, Institute for Earth Systems Science and Policy,100 Campus Center, Bldg 46A
Seaside California 93955 USA (831) 582-3529 (831) 582-3073 rikk_kvitek@csumb.edu Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 2; ESRI ArcCatalog 8.1.1.649 Shapefile 9/30/02 3/25/03-3/26/03 publication date Bathymetric data were post-processed using CARIS HIPS hydrographic data cleaning system software. Soundings were corrected for vessel motion using TSS POS/MV data, variations in water column sound velocity using AML SV+ data, and adjusted to MLLW using predicted tide charts for the local region. Cleaning to remove erroneous soundings was completed in CARIS HIPS. Soundings were exported from CARIS HIPS as a decimated x,y,z ASCII text (shoal biased) with 1m, 100m, 300m, and 500m spacing. The 3m decimated x,y,z ASCII text is imported into Fledermaus AverageGridder to generate 3m grid(s). The 3m ArcInfo ASCII raster grid (.asc) was imported into Spatial Analyst to generate a 3m bathymetry grid. Contour lines were then generated from the 3m bathymetry grid within Spatial Analyst. Pat Iampietro Seafloor Mapping Lab, California State University Monterey Bay Project Manager, Chief Hydrographer mailing and physical address
California State University Monterey Bay, Institute for Earth Systems Science and Policy,100 Campus Center, Bldg 46A
Seaside California 93933 USA (831) 582-4214 (831) 582-3073 pat_iampietro@csumb.edu Vector String 439 SimplePolylineFALSE439FALSEFALSE coordinate pair 0.000008 0.000008 meters Universal Transverse Mercator100.999600-123.0000000.000000500000.0000000.000000 D_WGS_1984 WGS_1984 6378137.000000 298.257224 GCS_WGS_1984WGS_1984_UTM_Zone_10N 5mcontour Feature Class439 FID Internal feature number. ESRI Sequential unique whole numbers that are automatically generated. FIDOID400 Shape Feature geometry. ESRI Coordinates defining the features. ShapeGeometry000 ID IDNumber10 CONTOUR CONTOURNumber14 0.480 2.009 20030624 Carrie Bretz Seafloor Mapping Lab, California State University Monterey Bay GIS Analyst and Metadata Manager mailing and physical address
California State University Monterey Bay, Institute for Earth Systems Science and Policy,100 Campus Center, Bldg 46A
Seaside California 93933 USA 831-582-4197 831-582-3073 carrie_bretz@csumb.edu FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 local time http://www.esri.com/metadata/esriprof80.html ESRI Metadata Profile enhttp://www.esri.com/metadata/esriprof80.htmlESRI Metadata Profile {52AD4638-C6B0-42F1-B028-12E17857BA58}2003061711543800FALSE20030624155338002003062415533800