COHSTREX 2006 Jetty Island Field Experiment


This reporting period was preparation for and execution of the first major experiment that took place from 3-27 July 2006. Progress was also made in the numerical modeling effort, which contributed to the planning of the field experiment. Here we highlight progress in the following areas:

Processing of the data from the main experiment is underway and promises to provide significant insight into the river flow and the wide variety of coherent structures.

The location of the experiment on the Snohomish River in Everett, WA is shown in the aerial photographs in Figure 1. The photograph on the right shows the location instrumentation barge and the submerged rocky sill that is exposed at low tide and forms a gap with the north tip of Jetty Island through which the river flows. Figure 2 shows the deployment of IR and video cameras and the RiverScat scatterometer from an aerial lift on a spud barge positioned at the north tip of Jetty Island.

Figure 1. Aerial photographs of the Snohomish River showing the location of the study area at the north tip of Jetty Island. The photograph on the right shows the location of the instrument barge and rocky sill at the north tip of Jetty Island.

Figure 2. Instrumentation barge (left) showing infrared and microwave sensors mounted on a hydraulic lift to a height of 28 m above the surface. View from barge (right) showing tip of Jetty Island (near) and rocky sill (far) exposed at low tide. The orange markers mounted on poles were used for georeferencing imagery.

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