Field Data Collection: Bulk Samples

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Figure 3: Representative bulk samples and surface pebble counts were made of the new deposit below the Marmot Dam site. Between 1500 and 2500 kg of sediment were excavated from each (approximately 1 m3) sampling pit (Figure 3B), and field-processed by sieving and weighing each size class (Figure 3A). From these data, grain size distributions (Figure 3C) were computed for the surface layer as well as the entire (surface + subsurface) bulk sample. In this pit, the surface is coarser than the subsurface, and the pebble count yields a finer measure of the surface than the bulk sample.

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Chuck Podolak, Johns Hopkins University
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