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Surficial Geology and Distribution of Post-Impoundment Sediment of the Western Part of Lake Mead Based on a Sidescan Sonar and High-Resolution Seismic-Reflection Survey

Figure 10.   Sidescan sonar image showing part of a submerged alluvial fan (location in inset map). The fine, downslope-trending, low backscatter lineations represent the floors of a network of small channels that sculpt the surface of this alluvial fan. One of the larger channels appears to be a braided stream. Seismic profile shows that these channels mostly have less than 5-m relief (0.2 sec. TWT is approximately 15 m), and that there is no sediment cover on the alluvial fan.

Click on figure for larger image.

Figure 10. Sidescan sonar image showing part of a submerged alluvial fan.


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