Predicting Slope Stability from Aerial Photos
Tests in southern California suggest that debris slides are concentrated within areas where they have occurred before, and that these areas are identifiable in photographs. Approximately 44 inches of precipitation fell on the Santa Ynez-San Raphael Mountains during January 1969, causing severe slides. Evidence of slides was found on 1968 prestorm aerial photos for about 20 percent of a 6.2-square-mile test area. Slides identified on 1969 poststorm photos covered 6.6 percent of the test area; 81 percent of this activity was confined to areas previously mapped as inherently unstable. Similar accuracy was achieved on another area by a novice using diagnostic guides developed for the earlier test. That success indicates that slope stability can be identified by foresters.
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Document Type: Journal Article
Affiliations: Principal Hydrologist, Pacific Southwest Forest and Range Experiment Station, USDA Forest Service, Berkeley, California, Stationed at Arcata, California
Publication date: 1979-03-01
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