A tripod sampling station on the Skagit tidal flats is fully exposed at low tide. Marker flags on long poles will allow researchers to find it at high tide, when it will be about 13 feet (4 meters) below the surface. Anchored to the ground with a meter-long screw pipe at each foot, the station holds instruments that measure conductivity (salinity), temperature, and flow speed of the water. A pressure sensor is buried in the sediment just below the tripod. (Photo by Steve Elgar)[back]
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