globalchange  > 气候变化与战略
DOI: 10.5194/cp-13-711-2017
Scopus记录号: 2-s2.0-85021097851
论文题名:
Extreme flood event reconstruction spanning the last century in the El Bibane Lagoon (southeastern Tunisia): A multi-proxy approach
作者: Affouri A.; Dezileau L.; Kallel N.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2017
卷: 13, 期:6
起始页码: 711
结束页码: 727
语种: 英语
英文摘要: Climate models project that rising atmospheric carbon dioxide concentrations will increase the frequency and the severity of some extreme weather events. The flood events represent a major risk for populations and infrastructures settled on coastal lowlands. Recent studies of lagoon sediments have enhanced our knowledge on extreme hydrological events such as palaeo-storms and on their relation with climate change over the last millennium. However, few studies have been undertaken to reconstruct past flood events from lagoon sediments. Here, the past flood activity was investigated using a multi-proxy approach combining sedimentological and geochemical analysis of surfaces sediments from a southeastern Tunisian catchment in order to trace the origin of sediment deposits in the El Bibane Lagoon. Three sediment sources were identified: marine, fluvial and aeolian. When applying this multi-proxy approach on core BL12-10, recovered from the El Bibane Lagoon, we can see that finer material, a high content of the clay and silt, and a high content of the elemental ratios (Fe/Ca and Ti/Ca) characterise the sedimentological signature of the palaeo-flood levels identified in the lagoonal sequence. For the last century, which is the period covered by the BL12-10 short core, three palaeo-flood events were identified. The age of these flood events have been determined by 210Pb and 137Cs chronology and give ages of AD 1995 ± 6, 1970 ± 9 and 1945 ± 9. These results show a good temporal correlation with historical flood events recorded in southern Tunisia in the last century (AD 1932, 1969, 1979 and 1995). Our finding suggests that reconstruction of the history of the hydrological extreme events during the upper Holocene is possible in this location through the use of the sedimentary archives.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/48909
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Recommended Citation:
Affouri A.,Dezileau L.,Kallel N.. Extreme flood event reconstruction spanning the last century in the El Bibane Lagoon (southeastern Tunisia): A multi-proxy approach[J]. Climate of the Past,2017-01-01,13(6)
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