Locating inputs of freshwater to Lynch Cove, Hood Canal, Washington, using aerial infrared photography

Sheibley, Rich W., and Josberger, Edward G., U.S. Geological Survey; Chickadel, Chris, University of Washington Applied Physics Laboratory

Abstract:

The input of freshwater and associated nutrients into Lynch Cove and lower Hood Canal (fig. 1) from sources such as groundwater seeps, small streams, and ephemeral creeks may play a major role in the nutrient loading and hydrodynamics of this low dissolved-oxygen (hypoxic) system. These disbursed sources exhibit a high degree of spatial variability. However, few in-situ measurements of groundwater seepage rates and nutrient concentrations are available and thus may not represent adequately the large spatial variability of groundwater discharge in the area. As a result, our understanding of these processes and their effect on hypoxic conditions in Hood Canal is limited. To determine the spatial variability and relative intensity of these sources, the U.S. Geological Survey Washington Water Science Center collaborated with the University of Washington Applied Physics Laboratory to obtain thermal infrared (TIR) images of the nearshore and intertidal regions of Lynch Cove at or near low tide. In the summer, cool freshwater discharges from seeps and streams, flows across the exposed, sun-warmed beach, and out on the warm surface of the marine water. These temperature differences are readily apparent in aerial thermal infrared imagery that we acquired during the summers of 2008 and 2009. When combined with co-incident video camera images, these temperature differences allow identification of the location, the type, and the relative intensity of the sources.

Genre:

USGS Numbered Series

ProdID:

98640

Citation Author:

Sheibley, Rich W., and Josberger, Edward G., U.S. Geological Survey; Chickadel, Chris, University of Washington Applied Physics Laboratory

Citation Contributing Office:

Washington Water Science Center

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Citation Language:

ENGLISH

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Citation LatN:

0473500

Citation LatS:

0471500

Citation LonE:

-1225000

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-1231000

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Citation Phsyical Description:

4 p.

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Prepared in cooperation with the Hood Canal Dissolved Oxygen Program and University of Washington Advanced Physics Laboratory

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U.S. Geological Survey

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Fact Sheet

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Citation Series Number:

2010-3072

Citation Search Results Text:

Locating inputs of freshwater to Lynch Cove, Hood Canal, Washington, using aerial infrared photography; 2010; FS; 2010-3072; Sheibley, Rich W., and Josberger, Edward G., U.S. Geological Survey; Chickadel, Chris, University of Washington Applied Physics Laboratory