The role of antecedent morphology and changing sediment sources in the postglacial palaeogeographical evolution of an incised valley: The sedimentary record of the Ría de Arousa (NW Iberia)

2021 ◽  
pp. 103727
Author(s):  
Víctor Cartelle ◽  
Iría García-Moreiras ◽  
Natalia Martínez-Carreño ◽  
Castor Muñoz Sobrino ◽  
Soledad García-Gil
Keyword(s):  
Sediment Sources ◽  
Sedimentary Record ◽  
Incised Valley ◽  
Nw Iberia

Downstream variation in bed sediment size along the East Carpathian rivers: evidence of the role of sediment sources

2008 ◽  
Vol 33 (5) ◽  
pp. 674-694 ◽  
Author(s):  
Maria Rădoane ◽  
Nicolae Rădoane ◽  
Dan Dumitriu ◽  
Crina Miclăuş
Keyword(s):  
Bed Sediment ◽  
Sediment Sources ◽  
Sediment Size

scholarly journals Factors Controlling the Extreme Storm Surge Flooding - Insights From Coastal Sedimentary Record of the Southern Baltic Sea

2022 ◽  
Author(s):  
Karolina Leszczyńska ◽  
Karl Stattegger ◽  
Damian Moskalewicz ◽  
Robert Jagodziński ◽  
Mikołaj Kokociński ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Storm Surge ◽  
Heavy Minerals ◽  
Sedimentary Record ◽  
Sea Levels ◽  
Southern Baltic Sea ◽  
Extreme Storm ◽  
Southern Baltic ◽  
Surge Flooding

Abstract Climate change and related sea-level rise pose significant threats to sandy lowland coasts, which account for approximately 30% of the global coastline. However, the role of key controlling factors responsible for the frequency and extent of extreme storm surge of inundation regime is not yet fully understood. Here, we present the longest to date, high-resolution sedimentary record of extreme storm surge flooding from the microtidal southern Baltic Sea, spanning two periods: 3.6-2.9 ka BP and 0.7 ka BP until present. Wetland sediments, including sandy event layers, were analyzed by sedimentological (grain size, loss-on-ignition, micromorphology), geochronological (14C, 210Pb, 137Cs), geochemical (XRF), mineralogical (heavy minerals) and micropaleontological (diatoms) methods. Our results revealed that both periods are characterized by high-frequency storm surge flooding in order of 1.3 – 4.2 events per century. They are correlated to widely recognized enhanced storminess periods in NW Europe and took place during both rising and fluctuating sea levels. The presented results show that the storm surge driven coastal inundation frequency and extent largely depend on the development of coastal barriers (e.g., beach ridges). Thus, in the context of the future coastal storm surge hazard, the protection of existing coastal barriers is essential.

Role of the Ollo de Sapo massive felsic volcanism of NW Iberia in the Early Ordovician dynamics of northern Gondwana

2010 ◽  
Vol 17 (2-3) ◽  
pp. 363-376 ◽  
Author(s):  
A. Díez Montes ◽  
J.R. Martínez Catalán ◽  
F. Bellido Mulas
Keyword(s):  
Early Ordovician ◽  
Nw Iberia ◽  
Felsic Volcanism

Foraminiferal and Sedimentary Record of Late Holocene Barrier Island Evolution, Pea Island, North Carolina: The Role of Storm Overwash, Inlet Processes, and Anthropogenic Modification

2006 ◽  
Vol 224 ◽  
pp. 836-846 ◽  
Author(s):  
Stephen J. Culver ◽  
Dorothea V. Ames ◽  
D. Reide Corbett ◽  
David J. Mallinson ◽  
Stanley R. Riggs ◽  
...  
Keyword(s):  
North Carolina ◽  
Late Holocene ◽  
Barrier Island ◽  
Sedimentary Record ◽  
Island Evolution

scholarly journals Congruence between fine-scale genetic breaks and dispersal potential in an estuarine seaweed across multiple transition zones

2019 ◽  
Vol 77 (1) ◽  
pp. 371-378 ◽  
Author(s):  
Katy R Nicastro ◽  
Jorge Assis ◽  
Ester A Serrão ◽  
Gareth A Pearson ◽  
João Neiva ◽  
...  
Keyword(s):  
Glacial Refugia ◽  
Secondary Contact ◽  
Population Fragmentation ◽  
Comprehensive Understanding ◽  
Transition Zones ◽  
Nw Iberia ◽  
Limited Dispersal ◽  
Genetic Clustering ◽  
Glacial Expansion

Abstract Genetic structure in biogeographical transition zones can be shaped by several factors including limited dispersal across barriers, admixture following secondary contact, differential selection, and mating incompatibility. A striking example is found in Northwest France and Northwest Spain, where the estuarine seaweed Fucus ceranoides L. exhibits sharp, regional genetic clustering. This pattern has been related to historical population fragmentation and divergence into distinct glacial refugia, followed by post-glacial expansion and secondary contact. The contemporary persistence of sharp ancient genetic breaks between nearby estuaries has been attributed to prior colonization effects (density barriers) but the effect of oceanographic barriers has not been tested. Here, through a combination of mesoscale sampling (15 consecutive populations) and population genetic data (mtIGS) in NW France, we define regional genetic disjunctions similar to those described in NW Iberia. Most importantly, using high resolution dispersal simulations for Brittany and Iberian populations, we provide evidence for a central role of contemporary hydrodynamics in maintaining genetic breaks across these two major biogeographic transition zones. Our findings further show the importance of a comprehensive understanding of oceanographic regimes in hydrodynamically complex coastal regions to explain the maintenance of sharp genetic breaks along continuously populated coastlines.

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