Reports

Bathymetric survey of Assawoman Bay, St. Martin River, Sinepuxent Bay and Newport Bay

2001, Wells, D.V., and Ortt, R.A., Jr.

File Reports, Coastal and Estuarine Geology, File Report 2001-02

Executive Summary

The Maryland Geological Survey, under contract with Fisheries Service, Maryland Department of Natural Resource, conducted hydrographic surveys in Assawoman Bay, St. Martin River, Sinepuxent Bay and Newport Bay. The purpose of the study was to provide a consistent bathymetry data set that may be used in other scientific studies. The hydrographic surveys were collected in May and June 2000, using differential global positioning service (DGPS) techniques and digital dual-frequency echo sounding equipment. Hydrographic survey lines were spaced 200 meters apart and extended from shore to shore. Five hundred kilometers of hydrographic records were surveyed and over 500,000 discrete soundings were recorded. In addition to the hydrographic surveys, water level data were collected at 10 different sites within the study area. The water level data were used to correct the echo sounding data for tide and wind offsets.

Sounding depths were adjusted to North America Vertical Datum of 1988 (NAVD88) and are listed in ASCII XYZ (northing, easting, depth) format. Location coordinates are in UTM, NAD83. The adjusted sounding data were used to generate 10-meter, regularly spaced grids for the four sub-basin areas and bathymetry (depth contour) map were created from the gridded data. The XYZ data, metadata, and maps are presented on CD-ROM.

Downloads and Data

File Report 2001-02 (pdf, 0.8 MB)
File Report 2001-02, plate 1 (pdf, 1.0 MB)
File Report 2001-02, plate 2 (pdf, 1.0 MB)
File Report 2001-02, plate 3 (pdf, 0.4 MB)