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Lookup NU author(s): Dr James Bathurst, John Richmond, Professor Timothy Ward
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Five models are investigated for determining the percentage delivery of sediment to streams for shallow landslides that evolve into debris flows. Models I-III are based on debris flow run-out distance, Model IV on snow avalanche run-out distance. For these it is assumed that percentage delivery is 100% for slopes above 10° and zero for slopes below 4°. For intermediate slope, delivery is based on the run-out distance estimate. Model V, derived from field data, estimates percentage delivery directly without the need for slope conditions. The model performances are investigated using 100 hypothetical hillslopes and a limited database on landslide sediment delivery in Idaho. Model IV performs best but Model I is a close second and its design (run-out distance varying with elevation drop) may be preferable for modeling purposes. Model II (run-out distance varying with debris flow slope and volume) provides a conservative upper limit on percentage delivery. Parallel use of models to provide bounds on the percentage delivery estimate is recommended. The assumption of no deposition at slopes above 10° is found to be not entirely correct and requires further research.
Author(s): Bathurst JC, Burton A, Ward TJ
Publication type: Article
Publication status: Published
Journal: Journal of Hydraulic Engineering
Year: 1997
Volume: 123
Issue: 5
Pages: 410-419
Print publication date: 01/05/1997
ISSN (print): 0733-9429
ISSN (electronic): 1943-7900
Publisher: American Society of Civil Engineers
URL: http://dx.doi.org/10.1061/(ASCE)0733-9429(1997)123:5(410)
DOI: 10.1061/(ASCE)0733-9429(1997)123:5(410)
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