Record Display for the EPA National Library Catalog


Main Title Utilizing a Chirp Sonar to Accurately Characterize Newly Deposited Material at the Calcasieu Ocean Dredged Material Disposal Site, Louisiana.
Author Schock, S. G. ; Keith, D. J. ; Debruin, D. L. ; Dettmann, E. ; Tracey, G. ;
CORP Author Florida Atlantic Univ., Boca Raton. Dept. of Ocean Engineering. ;Science Applications International Corp., Narragansett, RI.;Environmental Protection Agency, Narragansett, RI.
Publisher c1992
Year Published 1992
Report Number EPA-68-C1-0005; EPA/600/A-93/206;
Stock Number PB93-229714
Additional Subjects Louisiana ; Marine disposal ; Dredged materials ; Sediments ; Sediment-water interfaces ; Environmental surveys ; Sonar ; Mapping ; Bulk density ; Grain size ; Thickness ; Reprints ; Calcasieu Bar Channel
Library Call Number Additional Info Location Last
NTIS  PB93-229714 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 7p
The distribution of dredged sediments is measured at the Calcasieu Ocean Dredged Material Disposal Site (ODMDS) using a chirp sonar immediately after disposal and two months later. Subbottom reflection data, generated by a chirp sonar transmitting a 4 to 20 kHz FM sweep, is processed to increase the vertical resolution of subbottom images from 4 cm to 1 cm. The distance between the sediment-water interface reflection and that generated by the underlying sediments is measured to generate contour maps of dredge material thickness. The strength of the sediment-water interface reflection is used to predict the mean grain size and bulk density of the surficial sediment layer. Contour maps of mean grain size, bulk density and sediment thickness provide the spatial and temporal movement of the dredged material.