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Library Relative sea-level rise in the Basque coast (N Spain): Different environmental consequences on the coastal area

Relative sea-level rise in the Basque coast (N Spain): Different environmental consequences on the coastal area

Relative sea-level rise in the Basque coast (N Spain): Different environmental consequences on the coastal area

Resource information

Date of publication
December 2013
Resource Language
ISBN / Resource ID
AGRIS:US201500196935
Pages
3-13

Short sediment cores taken from (i) a recently regenerated salt marsh (Plentzia estuary), (ii) an incipient marsh and (iii) a pristine marsh (Urdaibai estuary), have been interpreted for evidence of environmental impacts and sea-level change on the basis of microfaunal and geochemical determinations and historical land management data. Under the current relative sea-level rise scenario, it might be expected that salt marsh ecosystems lose their ability to keep up with tidal flooding and drown following a transgressional pattern where marsh vegetation replaces woody plant species. With more frequent inundation from rising sea level, the change would progress from high marsh through a transition to the low marsh state. Ultimately this would lead to the development of a mud flat when sea level rises beyond low marsh accretion rates, with important coastal management implications. Geological observations from the southeastern Bay of Biscay, however, suggest that this model does not always apply. Evidence indicates that reclaimed areas rapidly gain elevation due to very high sedimentation rates and are colonized by salt marsh vegetation within a few decades, pristine salt marshes in this case have kept up with current sea-level rise, but more importantly, due to high sedimentation rates, even former intertidal mud flats have gained elevation over the last 50 years allowing salt marsh vegetation to colonize new areas. This recent evolution, however, has to be considered in a context of anthropogenic impacts in river catchments wherein sediment supply has been enhanced by human activity.

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Authors and Publishers

Author(s), editor(s), contributor(s)

Leorri, Eduardo
Cearreta, Alejandro
García-Artola, Ane
Irabien, María Jesús
Blake, William H.

Publisher(s)
Data Provider