Holocene-long record of flood frequency in the Southern Alps (Lake Iseo, Italy) under human and climate forcing

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A90072%2F19%3A00344155" target="_blank" >RIV/68407700:90072/19:00344155 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1016/j.gloplacha.2019.02.010" target="_blank" >https://doi.org/10.1016/j.gloplacha.2019.02.010</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.gloplacha.2019.02.010" target="_blank" >10.1016/j.gloplacha.2019.02.010</a>

Result language

angličtina

Original language name

Holocene-long record of flood frequency in the Southern Alps (Lake Iseo, Italy) under human and climate forcing

Original language description

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 (< 1 flood/century), while after 4 kyr cal BP, the flood frequency increased. This pattern appears to be in agreement with other Southern Alpine paleo flood records. The transition is interpreted as a nonlinear climate response to the orbital-driven gradual decrease in summer insolation at 60 degrees N, which together with the influence of the Mediterranean mesoscale precipitation events, is typical for the Mediterranean climate. However, the comparison of the flood record with the archaeological and historical data from the watershed suggests that human activity during the Roman period in the vicinity of the main tributaries also influenced the flood frequency. Even in a large Alpine lake and > 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 plurimil

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10505 - Geology

Project

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Continuities

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Publication year

2019

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

GLOBAL AND PLANETARY CHANGE

ISSN

0921-8181

e-ISSN

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Volume of the periodical

175

Issue of the periodical within the volume

1

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

13

Pages from-to

160-172

UT code for WoS article

000463982700013

EID of the result in the Scopus database

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