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dc.contributor.authorKeaton, Jeffrey R.
dc.date.accessioned2019-08-09T22:38:59Z
dc.date.accessioned2022-02-02T14:39:03Z
dc.date.available2019-08-09T22:38:59Z
dc.date.available2022-02-02T14:39:03Z
dc.date.issued2019
dc.identifier.urihttps://hdl.handle.net/11124/173148
dc.identifier.urihttp://dx.doi.org/10.25676/11124/173148
dc.description.abstractSlopes above Montecito burned by the Thomas Fire in December 2017 produced disastrous debris flows in response to a short period of intense precipitation on January 9, 2018, killing 23 people, injuring many others, destroying and damaging residential buildings, and community infrastructure. The intense precipitation was in a narrow cold frontal rainband which obviously exceeded the intensity and duration threshold for post-wildfire debris flows. Rain gauges with self-activating radio transmitters reported by County of Santa Barbara Department of Public Works documented the precipitation in the Montecito area as it occurred, which allowed short-duration intensities to be calculated. Data from the rain gauge on Montecito Creek was used in this paper and showed that the rainband that produced the precipitation that generated the debris flows passed over Montecito in about one-half hour. Two weather radar stations operated by the National Weather Service are located within about 100 km of Montecito. Both stations were operational and recorded radar reflectivity on a frequency of about five minutes during the entire storm; data from the KVTX station located east of Montecito was used for this paper. Montecito is located on a coastal plain south of the Santa Ynez Mountains, which shield the lower elevations in the Montecito area from direct view of the radar stations. Composite radar reflectivity represents the amount of water droplets in the atmosphere in line-of-sight above the ground. The weather radar shows patterns similar to the precipitation documented by the rain gauges. Radar reflectivity at the coordinates of the rain gauge on Montecito Creek and at the coordinates of a point in the Santa Ynez Mountains on the west side of the Santa Ynez Creek watershed was extracted and converted to an approximate rainfall depth using a general National Weather Service relationship. The results are used to demonstrate the value of weather radar reflectivity for visualization and for developing approximate rainfall intensity and duration estimates at positions of interest remote from rain gauges for comparison with post-wildfire debris-flow thresholds.. The analysis in this paper was developed as part of the Geotechnical Extreme Event Reconnaissance (GEER) Association response to the Montecito disaster.
dc.format.mediumborn digital
dc.format.mediumproceedings (reports)
dc.languageEnglish
dc.language.isoeng
dc.publisherColorado School of Mines. Arthur Lakes Library
dc.relation.ispartofSeventh International Conference on Debris-Flow Hazards Mitigation - Proceedings
dc.relation.ispartofAssociation of Environmental and Engineering Geologists; special publication 28
dc.rightsCopyright of the original work is retained by the author.
dc.sourceContained in: Proceedings of the Seventh International Conference on Debris-Flow Hazards Mitigation, Golden, Colorado, USA, June 10-13, 2019, https://hdl.handle.net/11124/173051
dc.subjectprecipitation intensity and duration
dc.subjectburned slopes
dc.subjectweather radar
dc.subjectdebris flow
dc.titleWeather-radar inferred intensity and duration of rainfall that triggered the January 9, 2018, Montecito, California, disaster
dc.typeText
dc.publisher.originalAssociation of Environmental and Engineering Geologists


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