Abstract
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 slopes, 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 perc...
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