Back to Search
Start Over
Holocene-long record of flood frequency in the Southern Alps (Lake Iseo, Italy) under human and climate forcing
- Source :
- Global and Planetary Change, Global and Planetary Change, 2019, 175, pp.160-172. ⟨10.1016/j.gloplacha.2019.02.010⟩, Global and Planetary Change, Elsevier, 2019, pp.160-172. ⟨10.1016/j.gloplacha.2019.02.010⟩
- Publication Year :
- 2019
- Publisher :
- HAL CCSD, 2019.
-
Abstract
- A high-resolution sedimentological and geochemical analysis of a 21 m sediment sequence of Lake Iseo (Southern Alps, Italy) allowed for the reconstruction of the long-term flood frequency by visual identification of the event layers over the last 12 kyr cal BP. In a previous study that was undertaken on another sediment core from Lake Iseo, these layers were attributed to extreme surface runoff events. However, in this former core, large mass-wasting deposits that induce significant hiatuses did not permit a continuous record of flood events to be established. Such disturbances were absent in the core studied in the present paper. This permitted to establish a high-resolution continuous Holocene record. Based on the flood chronicle and sedimentological and XRF geochemical analyses, we found evidence of a major palaeohydrological transition at approximately 3.8 kyr cal BP, which was previously described as occurring in the western Mediterranean region. The oldest part of the record indeed presents a very low frequency of flood events ( 2000 years ago, extreme precipitation events that were recorded through the sedimentation process can hence be impacted by the anthropization of the catchment area pointing the requirement of deeper studies of Earth surface critical zone pluri-millennial dynamics.
- Subjects :
- Mediterranean climate
010506 paleontology
010504 meteorology & atmospheric sciences
[SDE.MCG]Environmental Sciences/Global Changes
Oceanography
01 natural sciences
Flood chronicle
Sequence (geology)
C2FN
Precipitation
[SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology
Holocene
ComputingMilieux_MISCELLANEOUS
0105 earth and related environmental sciences
Global and Planetary Change
Flood myth
Sediment
Human impact
Anthropization
[SHS.GEO]Humanities and Social Sciences/Geography
Lake sediment
13. Climate action
Physical geography
Surface runoff
Geology
Southern Alps
Subjects
Details
- Language :
- English
- ISSN :
- 09218181
- Database :
- OpenAIRE
- Journal :
- Global and Planetary Change, Global and Planetary Change, 2019, 175, pp.160-172. ⟨10.1016/j.gloplacha.2019.02.010⟩, Global and Planetary Change, Elsevier, 2019, pp.160-172. ⟨10.1016/j.gloplacha.2019.02.010⟩
- Accession number :
- edsair.doi.dedup.....437b0810b548a4e2d16dcba08ae157ec