2003 Seattle Annual Meeting (November 25, 2003)
Paper No. 86-6
Presentation Time: 8:00 AM-12:00 PM

BRUNEAU SAND DUNES, EAGLE COVE, ID: A GEOMORPHOLOGIC STUDY

LENHARTZEN, Valerie J.1, THOMAS, Jeremiah J.1, WILKINS, David1, and CLEMENT, William P.2, (1) Geosciences, Boise State Univ, 1910 University Drive, Boise, ID 83725, vjlenhartzen@cableone.net, (2) Center for Geophysical Investigation of the Shallow Subsurface, Boise State Univ, 1910 University Dr, Boise, ID 83725-1535

The Bruneau Dunes State Park is located south of Mountain Home, Idaho and lies within Eagle Cove, a semi-circular 5.5 km diameter, 180-meter deep basin that formed by an old meander of the ancient Snake River. The Eagle Cove depression acts as a sand trap for wind blown sediments that sweep across the surrounding plateaus. Various methods used to ascertain the history and apparent stability of the dune features were grain size/hygroscopic moisture analysis, digitalized air photo comparisons, observation of local vegetation and water sources, collection of wind direction/speed data, and analysis of previous ground penetrating radar studies. We have determined these sand dune features, in particular the large dune complex and its central crater, to be relatively stable due to bimodal seasonal winds, the presence of a lake at the base of the large dune complex, vegetation on and around the dune, and the moisture-retaining silt content in the sands at the base of the large dune complex.

2003 Seattle Annual Meeting (November 25, 2003)
Session No. 86--Booth# 131
Quaternary Geology/Geomorphology (Posters) I: Lakes, Dunes, Soils, and Tectonics
Washington State Convention and Trade Center: Hall 4-F
8:00 AM-12:00 PM, Monday, November 3, 2003

Geological Society of America Abstracts with Programs, Vol. 35, No. 6, September 2003, p. 170

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