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Title: Controls on coastal flooding in the southern Baltic Sea revealed from the late Holocene sedimentary records
Authors: Leszczyńska, Karolina
Stattegger, Karl
Moskalewicz, Damian
Jagodziński, Robert
Kokociński, Mikołaj
Niedzielski, Przemysław
Szczuciński, Witold
Keywords: coastal zone
Baltic Sea
Puck Bay
sedimentary record
coastal sediments
Late Holocene
event deposits
radiocarbon dating
sediment geochemistry
grain size analysis
heavy minerals
storm surge
storm climate
coastal protection
sea level change
coastal floods
natural hazards
coastal development
Issue Date: 11-Jun-2022
Citation: Scientific Reports 2022, Vol. 12, art. 9710.
Abstract: Climate change and related sea-level rise pose significant threats to lowland coasts. However, the role of key controlling factors responsible for the frequency and landward extent of extreme storm surges is not yet fully understood. Here, we present a high-resolution sedimentary record of extreme storm surge flooding from the non-tidal southern Baltic Sea, spanning two periods: 3.6–2.9 ka BP and 0.7 ka BP until present. Sediments from coastal wetland, including sandy event layers, were analyzed by sedimentological (grain size, loss-on-ignition, micromorphology), geochronological (14C), geochemical (XRF), mineralogical (heavy minerals) and micropaleontological (diatoms) methods. The results show that both periods were characterized by high-frequency of storm surge flooding, in order of 1.3–4.2 events per century. These periods correlate with phases of enhanced storminess in northwest Europe and took place during both rising and fluctuating sea levels. The study shows that the frequency and landward extent of coastal inundation, largely depended on the development of natural barriers (e.g. beach ridges and aeolian foredunes). Thus, in the context of the future coastal storm-surge hazard, the protection of existing coastal barriers and their morphology is essential.
Sponsorship: Narodowe Centrum Nauki, grant 2018/29/B/ST10/00042.
DOI: 10.1038/s41598-022-13860-4
Appears in Collections:Artykuły naukowe (WNGiG)

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