Wind and tidal forcing of a buoyant plume, Mobile Bay, Alabama

Abstract

Abstract

AVHRR satellite imagery and in situ observations were combined to study the motion of a buoyant plume at the mouth of Mobile Bay, Alabama. The plume extended up to 30 km from shore, with a thickness of about 1 m. The inner plume, which was 3–8 m thick, moved between the Bay and inner shelf in response to tidal forcing. The tidal prism could be identified through the movement of plume waters between satellite images. The plume responded rapidly to alongshore wind, with sections of the plume moving at speeds of more than 70 cm s−1, about 11% of the wind speed. The plume moved predominantly in the direction of the wind with a weak Ekman drift. The enhanced speed of the plume relative to normal surface drift is probably due to the strong stratification in the plume, which limits the transfer of momentum into the underlying ambient waters.

Department

School of Marine Science and Ocean Engineering

Publication Date

11-1993

Publisher

Elsevier

Journal Title

Continental Shelf Research

Digital Object Identifier (DOI)

10.1016/0278-4343(93)90053-Z

Document Type

Article

Link to Full Text

Share

COinS