Conference Paper

Statistical analysis of the relationship between fluvial sediment and coastal dunes in the Cantabrian coast

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Abstract

During the last decades, fluvial systems of the Cantabrian region (Northwest of Spain) have experienced important geomorphological changes. These changes are characterized by main channel incision and narrowing, vegetal colonization of fluvial bars and channel morphology simplification. This trend has been described in other spanish and Atlantic European rivers. Some authors suggest that these changes are caused by a general decrease in sediment supply rates. Current data available for Cantabrian basins are consistent with this interpretation, but no systematic analysis has been carried out yet to support this hypothesis. In this context, evidences of this decrease in the sediment supply could find in the extent variations of coastal beaches and dunes, which are built mainly with the sand that comes from the rivers. Databases about waves height, fluvial flows and changes in the extension of dunes in the West coast of Asturias have been analyzed by fitting different regression models using R to identify trends in the sediment supply from the rivers and to discuss the influence of other marine variables, taking in account the potential impact of the dams and sea level changes related with the climatic change.

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... La mayor parte de los cambios se produjeron durante el periodo 1956--1989, previamente a las canalizaciones ejecutadas en la cuenca, pero coincidiendo con el periodo en el que se concentran la mayor parte de los cambios en los usos del suelo. Adicionalmente, esta menor disponibilidad de sedimento móvil en los lechos de los ríos parece estar repercu-tiendo en el almacén de sedimentos de los sistemas litorales asociados, tal y como están señalando algunos estudios preliminares reali-zados en el Cantábrico (Fernández--Iglesias et al., 2016). Agradecimientos Los datos presentados en el presente estudio proceden de varios trabajos realizados entre los años 2008--2011 en el marco del Sistema Nacional de Cartografía de Zonas Inundables y del proyecto Riverchanges (CGL2015--68824--R, MINECO--FEDER). ...
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The fluvial environment is very sensitive to artificial modifications and it is one of the environments where the impact of global change are more visible. During the last decades, the morphology of the rivers in the Cantabrian Mountains has changed. The aim of this paper is quantify these changes and analyse their relation with some artificial activities. The changes happened along 1095 km of alluvial channels in Asturias and Cantabria in the last 50 years have been analysed, taking to account the length with artificial channelization. Significant reductions have also identified in the most active part of the channel (low water channel and bars without vegetation). The mapping of land uses changes in the Saja river basin suggests that the increase in of shrub and tress from 1956 until now could be responsible for these geomorphological changes in the rivers.
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