Great Basin Dunes And Winds: What Might They Tell Us About The ...

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Location

Continent: North America Country: United States State/Province: City/Town: UTM coordinates and datum: none

Setting

Climate Setting: Semi-Arid Tectonic setting: Continental Rift Type: Process

Figure 1. Ancient dune deposits in the Navajo Sandstone, northern Arizona Show caption HideFigure 1. Ancient dune deposits in the Navajo Sandstone of northern Arizona. The arrow shows the prevailing wind direction when the dunes were formed. (Photo courtesy of Marjorie Chan). Details

Figure 2. Location map of Great Basin, U. S. A., Show caption HideFigure 2. Location map of Great Basin, U. S. A., and important dune fields located in the Great Basin (shown as stars). Upper left thumbnail shows the Winnemucca dune field, upper right is the Lynndyl dune field, lower left is Armagosa dune field, and the lower right is the Coral Pink dune field Details

Figure 3. Wind rose diagram Show caption HideFigure 3. A single wind rose diagram showing how wind data from a variety of different directions (solid lines) are transformed into a single resultant (dashed line) representing the direction that sediment is transported by wind. Details

Figure 4. Sand roses of selected location the Great Basin, U.S.A. Show caption HideFigure 4. Solid lines are the direction from which strong (> 6 m/s) winds come from (in 22.5 degree bins). Dashed lines represent the resultant of the solid lines and thus indicate the predominant direction of wind drift. Numbers represent the relative strength of the resultants. Note the relatively strong wind drift directions in the southern and eastern portion of the Great Basin. Details figure 5. Cartoon showing cyclogenesis and development of cold fronts in the Great Basin Show caption HideFigure 5. A. An upper level low pressure trough approaches the Great Basin. B. Energy from the low pressure is stalled by the Sierra Nevada Mountains, resulting in strong wind energy developing from the south end in the southern Great Basin. C. The cold front intensifies along the Wasatch Front and the eastern Great Basin with accompanying strong southerly winds. Details

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