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UTILIZING A CHIRP SONAR TO ACCURATELY CHARACTERIZE NEWLY DEPOSITED MATERIAL AT THE CALCASIEU OCEAN DREDGED MATERIAL DISPOSAL SITE, LOUISIANA
Citation:
Schock, S., D.J. Keith, D. Debruin, E. Dettman, AND G. Tracey. UTILIZING A CHIRP SONAR TO ACCURATELY CHARACTERIZE NEWLY DEPOSITED MATERIAL AT THE CALCASIEU OCEAN DREDGED MATERIAL DISPOSAL SITE, LOUISIANA. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/A-93/206.
Description:
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. ubbottom 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 I cm. he distance between the sediment-water interface reflection and that generated by the underlying sediments is measured to generate contour maps of dredge material thickness. he strength of the sediment-water interface reflection is used to predict the mean grain size and bulk density of the surficial sediment layer. ontour maps of mean grain size, bulk density and sediment thickness provide the spatial and temporal movement of the dredged material.