Print Email Facebook Twitter Invited perspectives Title Invited perspectives: Hydrological perspectives on precipitation intensity-duration thresholds for landslide initiation: Proposing hydro-meteorological thresholds Author Bogaard, T.A. (TU Delft Water Resources) Greco, R. (Università degli Studi della Campania “Luigi Vanvitelli”) Date 2018 Abstract Many shallow landslides and debris flows are precipitation initiated. Therefore, regional landslide hazard assessment is often based on empirically derived precipitation intensity-duration (ID) thresholds and landslide inventories. Generally, two features of precipitation events are plotted and labeled with (shallow) landslide occurrence or nonoccurrence. Hereafter, a separation line or zone is drawn, mostly in logarithmic space. The practical background of ID is that often only meteorological information is available when analyzing (non-)occurrence of shallow landslides and, at the same time, it could be that precipitation information is a good proxy for both meteorological trigger and hydrological cause. Although applied in many case studies, this approach suffers from many false positives as well as limited physical process understanding. Some first steps towards a more hydrologically based approach have been proposed in the past, but these efforts received limited follow-up. Therefore, the objective of our paper is to (a) critically analyze the concept of precipitation ID thresholds for shallow landslides and debris flows from a hydro-meteorological point of view and (b) propose a trigger-cause conceptual framework for lumped regional hydro-meteorological hazard assessment based on published examples and associated discussion. We discuss the ID thresholds in relation to return periods of precipitation, soil physics, and slope and catchment water balance. With this paper, we aim to contribute to the development of a stronger conceptual model for regional landslide hazard assessment based on physical process understanding and empirical data. To reference this document use: http://resolver.tudelft.nl/uuid:7e4ed14e-db92-4c0a-88e8-1a38e86dceac DOI https://doi.org/10.5194/nhess-18-31-2018 ISSN 1561-8633 Source Natural Hazards and Earth System Sciences, 18 (1), 31-39 Part of collection Institutional Repository Document type review Rights © 2018 T.A. Bogaard, R. Greco Files PDF nhess_18_31_2018.pdf 1.72 MB Close viewer /islandora/object/uuid:7e4ed14e-db92-4c0a-88e8-1a38e86dceac/datastream/OBJ/view