Coastal dynamics and wetlands stability. The Ebro delta case |
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Authors: | Herminia I Valdemoro Agustín Sánchez-Arcilla José A Jiménez |
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Institution: | (1) Laboratori d’Enginyeria Marítima, ETSECCPB, Universitat Politécnica de Catalunya, c/Jordi Girona 1-3, Campus Nord ed. D1, 08034, Barcelona, Spain |
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Abstract: | Coastal wetland stability and structure can be significantly affected by littoral processes when they are close to the shoreline.
Thus, under certain conditions, the combination of shoreline dynamics and direct wave action during storms can influence the
stability of marshes and vegetation community composition. This interaction between littoral dynamics and coastal wetlands
is illustrated by analysing processes taking place in the Buda Island (Ebro delta, NW Spain), where a coastal lagoon very
close to a retreating shoreline exists. Two main time scales have been found to be relevant for interaction of coastal processes
with ecosystem dynamics, the decadal and episodic scales. The decadal scale determines the average trend in beach width and
directly controls the potential loss of wetland surface. The episodic scale is linked to the occurrence of wave and storm
surge events and it determines a pulsing stress in the ecosystem through flooding, being key parameters to determine their
direct influence the intensity and repetition of these events. |
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Keywords: | Ebro delta Coastal erosion Coastal wetlands |
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