Linking landslide susceptibility to sediment yield at regional scale: application to Romania

[en] It is generally accepted that catchment sediment yield (SY, t km− 2 y− 1) can be strongly influenced by landsliding. Nevertheless, due to data requirements, only few studies investigated this effect at a regional scale. The objective of this study is therefore to explore the potential of a landslide susceptibility map for explaining the spatial variation of SY in Romania. We selected 133 catchments in Romania for which SY was measured during a period of at least 10 years. For each catchment, we derived a variety of proxies that potentially explain SY, including several indicators of landslide occurrence. The latter were derived from a published landslide susceptibility map. Results show that SY is significantly correlated with mean landslide susceptibility (r2 = 0.30). Estimates of average sheet and rill erosion rates showed a much weaker correlation with SY (r2 = 0.06). Further analyses showed that the strong correlation between SY and landslide susceptibility is mainly attributed to regional variations in lithology and seismicity. Especially the latter may play a crucial role in understanding denudation rates at regional scales, e.g. by facilitating the occurrence of landslides. Using landslide proxies that also account for sediment connectivity did not result in stronger correlations. Overall, our results show that landslide susceptibility maps can be a highly useful tool to predict SY at regional scales, provided that they incorporate all relevant factors. © 2016 Elsevier B.V.

Disciplines :

Earth sciences & physical geography

Author, co-author :

Broeckx, J.; Department of Earth and Environmental Sciences, KU Leuven, Celestijnenlaan 200E, Heverlee, Belgium

Vanmaercke, Matthias ; Université de Liège > Département de géographie > Géographie physique et du quaternaire

Bălteanu, D.; Romanian Academy, Institute of Geography, Dimitrie Racovita St. 12, Sector 2, Bucharest, Romania

Chendeş, V.; National Institute of Hydrology and Water Management, Sos. Bucuresti – Ploiesti 97, Sector 1, Bucharest, Romania

Sima, M.; Romanian Academy, Institute of Geography, Dimitrie Racovita St. 12, Sector 2, Bucharest, Romania

Enciu, P.; Romanian Academy, Institute of Geography, Dimitrie Racovita St. 12, Sector 2, Bucharest, Romania

Poesen, J.; Department of Earth and Environmental Sciences, KU Leuven, Celestijnenlaan 200E, Heverlee, Belgium

Language :

English

Title :

Linking landslide susceptibility to sediment yield at regional scale: application to Romania

Publication date :

2016

Journal title :

Geomorphology

ISSN :

0169-555X

eISSN :

1872-695X

Publisher :

Elsevier B.V.

Volume :

268

Pages :

222-232

Peer reviewed :

Peer Reviewed verified by ORBi

Funders :

FWO - Fonds Wetenschappelijk Onderzoek Vlaanderen

Available on ORBi :

since 28 March 2017

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