. Mass soil movements in the Andrews Experimental Forest. Earth movements Oregon; Soil mechanics Oregon. Figure 4. —View of typical backslope slump which has also caused roadfill failure. near the head of a tributary drain- age. When the soil became satu- rated, the entire mantle either slumped or flowed downslope and temporarily blocked the drainage channel. When a sufficient head of water was built up, this temporary dam breached, and a wall of water and debris rushed down the channel removing everything in its path. The end re suit was a drainage chan- nel from which virtually all unco
. Mass soil movements in the Andrews Experimental Forest. Earth movements Oregon; Soil mechanics Oregon. Figure 4. —View of typical backslope slump which has also caused roadfill failure. near the head of a tributary drain- age. When the soil became satu- rated, the entire mantle either slumped or flowed downslope and temporarily blocked the drainage channel. When a sufficient head of water was built up, this temporary dam breached, and a wall of water and debris rushed down the channel removing everything in its path. The end re suit was a drainage chan- nel from which virtually all uncon- solidated material has been remov- ed exposing bare rock. All four events of this type occurred in areas of hard, frac- tured, greenish breccias and tuffs. Figure movement at the head of a drainage caused by high flows through the culvert and inadequate energy dissipation at the outlet 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 Dyrness, C. T. cn; Pacific Northwest Forest and Range Experiment Station (Portland, Or. ). [Portland, Or. ] : Pacific Northwest Forest and Range Experiment Station, Forest Service, U. S. Dept. of Agriculture
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