Hydrology of A Slide-Prone Glacial Till Soil in Southeast Alaska
Heavy irrigation caused no surface runoff, erosion, or debris avalanches on well-drained Karta soil, a tentative series producing much of the commercial timber in southeast Alaska. Interpreting measured rainfall, streamflow, and piezometric head in terms of Darcy's equation showed how this slide-prone soil accommodates large amounts of water. About 2/3 of the water applied drained laterally through permeable surface layers to a stream adjacent to the study area. The remaining 1/3 presumably drained deeply into highly fractured bedrock. Less permeable soil, less fractured bedrock, or longer irrigated slopes probably would have caused saturated soil under heavy watering. It appears that Karta soil must be saturated to cause debris avalanches, a condition which may occur naturally when much larger areas are wetted by much smaller rainfall.
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Document Type: Journal Article
Affiliations: Research Geologist, Pacific Northwest Forest and Range Expt. Sta., Institute of Northern Forestry, Forest Service, U. S. Dept. Agric., Juneau, Alaska
Publication date: 1968-01-01
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