The role of debris supply conditions in predicting debris flow activity

Autor:	Matthias Jakob, Michael J. Bovis
Rok vydání:	1999
Předmět:	Terrain analysis Hydrology Geography Planning and Development Earth and Planetary Sciences (miscellaneous) Magnitude (mathematics) Terrain Geomorphology Debris Geology Drainage density Earth-Surface Processes Debris flow
Zdroj:	Earth Surface Processes and Landforms. 24:1039-1054
ISSN:	1096-9837 0197-9337
DOI:	10.1002/(sici)1096-9837(199910)24:11<1039::aid-esp29>3.0.co;2-u
Popis:	Debris flow frequency and magnitude were determined for 33 basins in southwest British Columbia. Basins were first classifiedaseitherweathering-limitedortransport-limitedusingadiscriminantfunctionbasedondebris-contributingarea, an area-weighted terrain stability number, and drainage density. Multiple regression was used to predict magnitude, peak discharge, frequency and activity (frequency times magnitude) within each group of basins. Model performance was improved by stratifying the total sample of debris flow basins into weathering-and transport-limited groups. Explained varianceincreasedbyanaverageof15percentinthetransport-limitedsample,indicatingthatsedimentsupplyconditionsin themoreactivebasinsarefundamentalinpredictingdebrisflowactivity.Anindependenttestoftheregressionmodelswith 11basinsyieldedgenerallygoodresultsfordebrisflowmagnitudeandpeakdischarge.Predictionofdebrisflowfrequency provedproblematicalinweathering-limitedbasins.Themethodsdevelopedhereprovideestimatesofdebrisflowattributes in basins for which few data on past events are available. Copyright # 1999 John Wiley & Sons, Ltd.
Databáze:	OpenAIRE
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