A new hierarchical Bayesian approach to analyse environmental and climatic influences on debris flow occurrence
How can debris flow occurrences be modelled at regional scale and take both environmental and climatic conditions into account? And, of the two, which has the most influence on debris flow activity? In this paper, we try to answer these questions with an innovative Bayesian hierarchical probabilisti...
Published in: | Geomorphology |
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Main Authors: | , , , , |
Other Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2015
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Online Access: | https://irsteadoc.irstea.fr/cemoa/PUB00047572 |
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ftcemoa:oai:irsteadoc.irstea.fr:PUB00047572 |
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openpolar |
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Open Polar |
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Irstea Publications et Bases documentaires (Irstea@doc/CemOA) |
op_collection_id |
ftcemoa |
language |
English |
topic |
LAVE TORRENTIELLE MODELE REGIONALISE CHANGEMENT CLIMATIQUE STATISTIQUE BAYESIENNE DEBRIS FLOW CLIMATIC CHANGE BAYESIAN STATISTICS |
spellingShingle |
LAVE TORRENTIELLE MODELE REGIONALISE CHANGEMENT CLIMATIQUE STATISTIQUE BAYESIENNE DEBRIS FLOW CLIMATIC CHANGE BAYESIAN STATISTICS Jomelli, V. Pavlova, I. Eckert, N. Grancher, D. Brunstein, D. A new hierarchical Bayesian approach to analyse environmental and climatic influences on debris flow occurrence |
topic_facet |
LAVE TORRENTIELLE MODELE REGIONALISE CHANGEMENT CLIMATIQUE STATISTIQUE BAYESIENNE DEBRIS FLOW CLIMATIC CHANGE BAYESIAN STATISTICS |
description |
How can debris flow occurrences be modelled at regional scale and take both environmental and climatic conditions into account? And, of the two, which has the most influence on debris flow activity? In this paper, we try to answer these questions with an innovative Bayesian hierarchical probabilistic model that simultaneously accounts for how debris flows respond to environmental and climatic variables. In it full decomposition of space and time effects in occurrence probabilities is assumed, revealing an environmental and a climatic trend shared by all years/catchments, respectively, clearly distinguished from residual "random" effects. The resulting regional and annual occurrence probabilities evaluated as functions of the covariates make it possible to weight the respective contribution of the different terms and, more generally, to check the model performances at different spatio-temporal scales. After suitable validation, the model can be used to make predictions at undocumented sites and could be used in further studies for predictions under future climate conditions. Also, the Bayesian paradigm easily copes with missing data, thus making it possible to account for events that may have been missed during surveys. As a case study, we extract 124 debris flow event triggered between 1970 and 2005 in 27 catchments located in the French Alps from the French national natural hazard survey and model their variability of occurrence considering environmental and climatic predictors at the same time. We document the environmental characteristics of each debris flow catchment (morphometry, lithology, land cover, and the presence of permafrost). We also compute 15 climate variables including mean temperature and precipitation between May and October and the number of rainy days with daily cumulative rainfall greater than 10/15/20/25/30/40 mm day(-1). Application of our model shows that the combination of environmental and climatic predictors explained 77% of the overall variability of debris flow occurrences in this data set Occurrence probabilities depend mainly on climatic variables, which explain 44% of the overall variability through the number of rainy days and maximum daily temperature. This important time component in the variability of overall debris flow occurrence is shown to be responsible for a significant increase in debris flow activity between 1970 and 2005 at regional scale. Environmental variables, which account for 33% of the overall variability, includes mostly the morphometric variables of the debris flow catchments. |
author2 |
CNRS UMR 8591 LGP MEUDON FRA IRSTEA GRENOBLE UR ETGR FRA |
format |
Article in Journal/Newspaper |
author |
Jomelli, V. Pavlova, I. Eckert, N. Grancher, D. Brunstein, D. |
author_facet |
Jomelli, V. Pavlova, I. Eckert, N. Grancher, D. Brunstein, D. |
author_sort |
Jomelli, V. |
title |
A new hierarchical Bayesian approach to analyse environmental and climatic influences on debris flow occurrence |
title_short |
A new hierarchical Bayesian approach to analyse environmental and climatic influences on debris flow occurrence |
title_full |
A new hierarchical Bayesian approach to analyse environmental and climatic influences on debris flow occurrence |
title_fullStr |
A new hierarchical Bayesian approach to analyse environmental and climatic influences on debris flow occurrence |
title_full_unstemmed |
A new hierarchical Bayesian approach to analyse environmental and climatic influences on debris flow occurrence |
title_sort |
new hierarchical bayesian approach to analyse environmental and climatic influences on debris flow occurrence |
publishDate |
2015 |
url |
https://irsteadoc.irstea.fr/cemoa/PUB00047572 |
genre |
permafrost |
genre_facet |
permafrost |
op_source |
42508 |
op_relation |
http://dx.doi.org/10.1016/j.geomorph.2015.05.022 https://irsteadoc.irstea.fr/cemoa/PUB00047572 |
op_rights |
Date de dépôt: 2016-03-01 - Tous les documents et informations contenus dans la base CemOA Publications sont protégés en vertu du droit de propriété intellectuelle, en particulier par le droit d'auteur. La personne consultant la base CemOA Publications peut visualiser, reproduire, ou stocker des copies des publications, à condition que l'information soit seulement pour son usage personnel et non commercial. L'utilisation des travaux universitaires est soumise à autorisation préalable de leurs auteurs. Toute information relative au signalement d'une publication contenue dans CemOA Publications doit inclure la citation bibliographique usuelle : Nom du ou des auteurs, titre et source du document, date et URL de la notice (dc_identifier). |
op_doi |
https://doi.org/10.1016/j.geomorph.2015.05.022 |
container_title |
Geomorphology |
container_volume |
250 |
container_start_page |
407 |
op_container_end_page |
421 |
_version_ |
1766167002485882880 |
spelling |
ftcemoa:oai:irsteadoc.irstea.fr:PUB00047572 2023-05-15T17:58:24+02:00 A new hierarchical Bayesian approach to analyse environmental and climatic influences on debris flow occurrence Jomelli, V. Pavlova, I. Eckert, N. Grancher, D. Brunstein, D. CNRS UMR 8591 LGP MEUDON FRA IRSTEA GRENOBLE UR ETGR FRA 2015 application/pdf https://irsteadoc.irstea.fr/cemoa/PUB00047572 Anglais eng http://dx.doi.org/10.1016/j.geomorph.2015.05.022 https://irsteadoc.irstea.fr/cemoa/PUB00047572 Date de dépôt: 2016-03-01 - Tous les documents et informations contenus dans la base CemOA Publications sont protégés en vertu du droit de propriété intellectuelle, en particulier par le droit d'auteur. La personne consultant la base CemOA Publications peut visualiser, reproduire, ou stocker des copies des publications, à condition que l'information soit seulement pour son usage personnel et non commercial. L'utilisation des travaux universitaires est soumise à autorisation préalable de leurs auteurs. Toute information relative au signalement d'une publication contenue dans CemOA Publications doit inclure la citation bibliographique usuelle : Nom du ou des auteurs, titre et source du document, date et URL de la notice (dc_identifier). 42508 LAVE TORRENTIELLE MODELE REGIONALISE CHANGEMENT CLIMATIQUE STATISTIQUE BAYESIENNE DEBRIS FLOW CLIMATIC CHANGE BAYESIAN STATISTICS Article de revue scientifique à comité de lecture 2015 ftcemoa https://doi.org/10.1016/j.geomorph.2015.05.022 2021-06-29T11:16:58Z How can debris flow occurrences be modelled at regional scale and take both environmental and climatic conditions into account? And, of the two, which has the most influence on debris flow activity? In this paper, we try to answer these questions with an innovative Bayesian hierarchical probabilistic model that simultaneously accounts for how debris flows respond to environmental and climatic variables. In it full decomposition of space and time effects in occurrence probabilities is assumed, revealing an environmental and a climatic trend shared by all years/catchments, respectively, clearly distinguished from residual "random" effects. The resulting regional and annual occurrence probabilities evaluated as functions of the covariates make it possible to weight the respective contribution of the different terms and, more generally, to check the model performances at different spatio-temporal scales. After suitable validation, the model can be used to make predictions at undocumented sites and could be used in further studies for predictions under future climate conditions. Also, the Bayesian paradigm easily copes with missing data, thus making it possible to account for events that may have been missed during surveys. As a case study, we extract 124 debris flow event triggered between 1970 and 2005 in 27 catchments located in the French Alps from the French national natural hazard survey and model their variability of occurrence considering environmental and climatic predictors at the same time. We document the environmental characteristics of each debris flow catchment (morphometry, lithology, land cover, and the presence of permafrost). We also compute 15 climate variables including mean temperature and precipitation between May and October and the number of rainy days with daily cumulative rainfall greater than 10/15/20/25/30/40 mm day(-1). Application of our model shows that the combination of environmental and climatic predictors explained 77% of the overall variability of debris flow occurrences in this data set Occurrence probabilities depend mainly on climatic variables, which explain 44% of the overall variability through the number of rainy days and maximum daily temperature. This important time component in the variability of overall debris flow occurrence is shown to be responsible for a significant increase in debris flow activity between 1970 and 2005 at regional scale. Environmental variables, which account for 33% of the overall variability, includes mostly the morphometric variables of the debris flow catchments. Article in Journal/Newspaper permafrost Irstea Publications et Bases documentaires (Irstea@doc/CemOA) Geomorphology 250 407 421 |