Thirty-one years of debris-flow observation and monitoring near La Honda, California, USA
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Abstract
From 1975 until 2006,18 intense storms triggered at least 248 debris flows within 10 km2 northwest of the town of La Honda within the Santa Cruz Mountains, California. In addition to mapping debris flows and other types of landslides, studies included soil sampling and geologic mapping, piezometric and tensiometer monitoring, and rainfall measurement and recording. From 1985 until 1995, a system with radio telemetered rain gages and piezometers within the La Honda region was used for issuing six debris-flow warnings within the San Francisco Bay region through the NOAA ALERT system. Depending upon the relative intensity of rainfall during storms, debris flows were generated from deep slumps, shallow slumps, shallow slides in colluvium and shallow slides over bedrock. Analysis shows the storms with abundant antecedent rainfall followed by several days of steady heavy intense rainfall triggered the most abundant debris flows. ?? 2007 millpress.
Suggested Citation
Wieczorek, G.F., Wilson, R.C., Ellen, S.D., Reid, M., and Jayko, A.S., 2007, Thirty-one years of debris-flow observation and monitoring near La Honda, California, USA, in International Conference on Debris-Flow Hazards Mitigation: Mechanics, Prediction, and Assessment, Proceedings, Chengdu, 10 September 2007 through 13 September 2007, p. 55-63.
| Publication type | Conference Paper |
|---|---|
| Publication Subtype | Conference Paper |
| Title | Thirty-one years of debris-flow observation and monitoring near La Honda, California, USA |
| ISBN | 9789059660595 |
| Year Published | 2007 |
| Language | English |
| Larger Work Title | International Conference on Debris-Flow Hazards Mitigation: Mechanics, Prediction, and Assessment, Proceedings |
| First page | 55 |
| Last page | 63 |
| Conference Title | 4th International Conference on Debris-Flow Hazards Mitigation: Mechanics, Prediction, and Assessment |
| Conference Location | Chengdu |
| Conference Date | 10 September 2007 through 13 September 2007 |