Observation of suspended sediments in Mobile Bay, Alabama from satellite



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As part of a comprehensive geologic study of coastal Alabama and Mississippi, the U.S. Geological Survey is investigating coastal sediment transport in Mobile Bay and the adjacent shelf. Satellite imagery from the NOAA AVHRR is being used to provide data on the variability of spatial patterns in the near-surface suspended sediment concentration. This imagery is processed using atmospheric corrections to remove haze and Rayleigh radiance in order to obtain water reflectances; the reflectances are than converted to approximate sediment concentrations using standard relationships between water reflectance and in situ sediment concentrations. A series of images from early 1990 shows rapid changes in sediment concentrations in response to high river flow of the Alabama-Tombigbee river system. During these times, suspended sediment tends to flow out Mobile Bay without mixing into the eastern lobe of the Bay (Bon Secour Bay). The sediment concentration field also appears to be disturbed by the main ship channel. The sediment plume extends more than 60 km offshore after the peak flow event. One wind event in December 1989 was identified as increasing sediment concentration in the Bay. It is not believed that such an event has been previously observed from satellite.
Publication type Conference Paper
Publication Subtype Conference Paper
Title Observation of suspended sediments in Mobile Bay, Alabama from satellite
ISBN 0872628086
Year Published 1991
Language English
Publisher Publ by ASCE
Publisher location New York, NY, United States
Larger Work Title Coastal Sediments '91
First page 789
Last page 802
Conference Title Proceedings of a Specialty Conference on Quantitative Approaches to Coastal Sediment Processes
Conference Location Seattle, WA, USA
Conference Date 25 June 1991 through 27 June 1991
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