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.
Image 18305 is a 1140 by 954 pixel JPEG
Uploaded: Dec3 09