Holocene floods in a complex fluvial wetland in central Spain: environmental variability, climate and time

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dc.contributor.author Santisteban Navarro, Juan Ignacio
dc.contributor.author Mediavilla López, Rosa
dc.contributor.author Galán de Frutos, Luis
dc.contributor.author López Cilla, Ignacio
dc.date.accessioned 2021-04-20T07:18:25Z
dc.date.available 2021-04-20T07:18:25Z
dc.date.issued 2019-10
dc.identifier.citation Global and Planetary change (2019), v.181, 102986 es_ES
dc.identifier.issn 0921-8181
dc.identifier.uri http://hdl.handle.net/20.500.12468/966
dc.description.abstract The study of flooding can be complex as it involves dynamic systems (rivers) characterized by high variability in time and space. To minimize the effects of these handicaps, we merge several records from different locations across the hydrographic basin of the Upper Guadiana River (central Spain) and use multiple proxies. The comparison of three nearby cores by means of the facies, stratigraphic correlation and geochemical indexes allows us to differentiate local environmental changes related to the natural behaviour of the system (autocyclic) from those driven by external forcings (allocyclic). The facies and facies sequence analyses allow long-term paleohydrological trends to be reconstructed and parameters that are used to identify flooding events to be determined. Si (proxy for siliciclastic supply) and Ca/S (proxy for water budget/level) show trends that can be related to facies sequences and long-term variations. Si/Al is used as a sorting proxy (transport efficiency). To analyse the relative changes in sediment discharge and transport efficiency, these proxies are compared with water budget level, represented by (Si/Al)/(Ca/S) (sorting vs. water level) and Si/(Ca/S) (siliciclastic discharge vs. water discharge). We were able to define local, major and minor regional flood events/periods and events by relating sequence boundaries to the occurrence of environmental conditions related to high energy events (relative/absolute sorting, water level, sediment discharge) across multiple cores. Comparison to other studies around the western Mediterranean basin allows us to identify common periods of flooding at 9000–8400 cal. BP, 7700–7100 cal. BP, 6400–6200 cal. BP, 4900–3700 cal. BP, 3500–3300 cal. BP, ca. 2600 cal. BP, ca. 2000 cal. BP, ca. 1500 cal. BP and 1000–300 cal. BP. For the long-term evolution, it seems that changes in insolation during the Holocene could have played a role in controlling the hydrology. However, determining the drivers of higher-frequency variation is more challenging due to uncertainties in the chronologies and local differences. Nevertheless, some degree of correlation among these flooding periods and higher frequency changes in irradiance, temperature and NAO is observed. es_ES
dc.description.sponsorship Departamento de Geodinámica, Estratigrafía y Paleontología, Universidad Complutense de Madrid, España es_ES
dc.description.sponsorship Instituto Geológico y Minero de España, España es_ES
dc.language.iso en es_ES
dc.publisher Elsevier es_ES
dc.relation CGL2011-30302-C02-01 es_ES
dc.rights Acceso abierto es_ES
dc.subject Central Spain es_ES
dc.subject Western Mediterranean es_ES
dc.subject facies analysis es_ES
dc.subject geochemical indexes es_ES
dc.subject hydroclimate es_ES
dc.subject forcing es_ES
dc.subject flooding es_ES
dc.subject Holocene es_ES
dc.subject humedal es_ES
dc.subject río Guadiana es_ES
dc.title Holocene floods in a complex fluvial wetland in central Spain: environmental variability, climate and time es_ES
dc.type Postprint es_ES
dc.relation.publisherversion https://www.sciencedirect.com/science/article/abs/pii/S0921818118307331 es_ES
dc.description.funder Ministerio de Economía y Competitividad, España es_ES
dc.identifier.doi https://doi.org/10.1016/j.gloplacha.2019.102986 es_ES
dc.coverage.spatialStudy España ; Mediterráneo Occidental es_ES

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