Estimation of Monthly Distribution of Debris-Flow Events for the Territory of the USA (using the Distribution Model for Periods of Debris-Flow Danger)

The present work illustrates calculation results of monthly distribution of debris-flow events for the territory of the USA according to the model for the periods of debris-flow danger fully described in the paper by N. Belaya (Belaya 2003). The model based on the dependency of the debris-flow regime on climate parameters has been developed in order to assess the monthly distribution of debris-flow events both for poorly explored mountain regions of the world and for scenarios of climate changes. It considers rainfall initiated debris-flows in accordance with the debris-flow genetic classification of V. F. Perov. The following small-scale maps and their short descriptions for the territory of the USA are presented in the work: the first and the last months of debris-flow danger period (DFDP) and the extreme debris-flow danger period (EDFDP).”, where DFDP is part of a calendar year during which 100% of all debris flows occur; EDFDP is part of the DFDP and accounts for more than 50 per cent of all debris-flow events. The borderlines of debris-flow hazard regions have been taken from the “Map of the world mudflow phenomena