. Mechanics of debris avalanching in shallow till soils of southeast Alaska. Soil mechanics Alaska; Landslides Alaska; Debris avalanches Alaska. Figure 2.—Piezometer being lowered into auger hole near slide 3. diameter, connected to 1/2-inch outside diameter polyethylene tubing (fig. 2). Three-inch holes were drilled with a bucket auger to a point approximately one- half inch below the unweathered till surface intersecting the zone of water movement. If water flowed freely into the hole, it was prepared for piezometer placement. Before placement, the depth of the hole to the unweathered till s
. Mechanics of debris avalanching in shallow till soils of southeast Alaska. Soil mechanics Alaska; Landslides Alaska; Debris avalanches Alaska. Figure 2.—Piezometer being lowered into auger hole near slide 3. diameter, connected to 1/2-inch outside diameter polyethylene tubing (fig. 2). Three-inch holes were drilled with a bucket auger to a point approximately one- half inch below the unweathered till surface intersecting the zone of water movement. If water flowed freely into the hole, it was prepared for piezometer placement. Before placement, the depth of the hole to the unweathered till surface and the length of the piezometer system were measured. Ten piezometers were installed during the latter part of August in 1964 and 1965 for measurements during the autumn rainy season. The sites were on open slopes within and outside linear depressions near the zone of initial failure of the three study areas. The slope angle measured at each location was between 34° and 40° ( ^ 70- to 85-percent grade). Piezometer locations are shown in figure 3. RESULTS SOIL CHARACTERISTICS The Karta soil is a well-drained shallow podzol with a gravelly, silt-loam texture (Gass et al. 1 967). Mechanical analyses of 1 9 disturbed samples reveal it to be well graded, with a corresponding particle size distribution high in silt and sand with less than 10 percent being clay size particles. Examination of the size fractions under a binocular microscope indicates the majority of particles to be angular to subangular in shape, composed of fragments of graywacke and argillite mixed with individual grains of quartz, feldspar, and ferromagnesian minerals. 4. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Swanston, Douglas N. cn. Juneau, Alaska : Pacific Northwest Forest and Range Experiment Station, Institute of Northern
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