Program and Agenda

Abstract

SURFACE MIXING FEATURES OF THE COLUMBIA RIVER PLUME LIFT-OFF

Airborne measurements at the mouth of the Columbia River captured 2D synoptic surface temperature and velocity observations from a light aircraft using thermal imaging (TIR) cameras and interferometric synthetic aperture radar (SAR). Observations covered the region in which plume lift-off occurs. In this region, estuarine water detaches from the bed and mixes vigorously with ocean water on ebb tidal currents. TIR and SAR imagery from these times displays 100 m flow-parallel streaks of alternating temperature and velocity water, which originate along a linear, transverse front in the river mouth. Streak appearances vary across the mouth with well-defined streaks on the north side of the inlet and streaks in the south characterized by discreet boils. Co-incident in situ measurements of temperature, salinity, and velocity profiles, made from an autonomous underwater vehicle (AUV), detail dramatic profile differences upstream and down stream of the surface lift-off point. Using repeat flights and the AUV transect data we will examine the surface development sequence of the lift-off mixing including timing, distribution, and length-scales of the streaks with a goal of determining their hydrodynamic controls.

Authors

Chickadel, C., Applied Physics Laboratory - Univeristy of Washington, USA, chickadel@apl.washington.edu

McNeil, C., Applied Physics Laboratory - Univeristy of Washington, USA, cmcneil@apl.washington.edu

Farquharson, G., Applied Physics Laboratory - Univeristy of Washington, USA, gordon@apl.washington.edu

Shcherbina, A., Applied Physics Laboratory - Univeristy of Washington, USA, ashcherbina@apl.washington.edu

Jessup, A., Applied Physics Laboratory - Univeristy of Washington, USA, jessup@apl.washington.edy

Details

Oral presentation

Session #:095
Date: 2/28/2014
Time: 15:15
Location: 301 AB

Presentation is given by student: No