| 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
|
| Holdings |
| Library |
Call Number |
Additional Info |
Location |
Last
Modified |
Checkout
Status |
| NTIS |
PB93-229714 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
| Collation |
7p |
| Abstract |
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. |
