Publication: Conectividad de sedimientos de la cuenca del río Leitzaran
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2021-09
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Abstract
El río Leitzaran es el principal afluente del río Oria, que desemboca en el mar Cantábrico. Dentro de los ríos de Gipuzkoa se trata de un valle singular y que ha logrado mantener un grado de naturalidad alto. Para poder hacer un planeamiento territorial óptimo, así como mejorar la calidad geomorfológica y ecológica del río, conocer la conectividad de sedimentos de los sistemas fluviales es un requisito indispensable. Por ello se ha sometido a estudio la cuenca del río Leitzaran, donde se ha implementado el índice de conectividad de sedimentos desarrollado por Cavalli et al., (2013), mediante diferentes técnicas SIG. Por una parte, se ha relacionado la conectividad de sedimentos con la propia rugosidad de la topografía; por otra parte, con los cambios de usos de suelo entre los años 1956 y 2018, que han producido cambios significativos en la conectividad de la cuenca. Además, se han identificado las fuentes de sedimentos de la cuenca, ya que el conocimiento de áreas específicas que aportan sedimentos a la red de drenaje es necesario para el estudio del transporte de sedimentos. Los resultados sugieren que la conectividad general de la cuenca ha mejorado a lo largo de los años y apuntan a que las fuertes pendientes de la cuenca condicionan completamente el índice de conectividad, dejando los usos de suelo en un segundo plano.
The Leitzaran River is the main tributary of the Oria River, which empties into the Cantabrian Sea. Within the rivers of Gipuzkoa it is a unique valley that has managed to maintain a high degree of naturalness. To be able to do an optimal territorial planning, as well as to improve the geomorphological and ecological quality of the river, knowing the sediment connectivity of the river systems is an indispensable requirement. For this reason, the Leitzaran river basin has been studied, where the sediment connectivity index developed by Cavalli et al. (2013), through different GIS techniques, has been implemented. On the one hand, sediment connectivity has been related to the roughness of the topography itself; on the other hand, with the changes in land use between 1956 and 2018, which have produced significant changes in the connectivity of the basin. In addition, the sources of sediments in the basin have been identified, since the knowledge of specific areas that contribute sediments to the drainage network is necessary for the study of sediment transport. The results suggest that the general connectivity of the basin has improved over the years and suggest that the steep slopes of the basin completely condition the connectivity index, leaving land uses in the background.
The Leitzaran River is the main tributary of the Oria River, which empties into the Cantabrian Sea. Within the rivers of Gipuzkoa it is a unique valley that has managed to maintain a high degree of naturalness. To be able to do an optimal territorial planning, as well as to improve the geomorphological and ecological quality of the river, knowing the sediment connectivity of the river systems is an indispensable requirement. For this reason, the Leitzaran river basin has been studied, where the sediment connectivity index developed by Cavalli et al. (2013), through different GIS techniques, has been implemented. On the one hand, sediment connectivity has been related to the roughness of the topography itself; on the other hand, with the changes in land use between 1956 and 2018, which have produced significant changes in the connectivity of the basin. In addition, the sources of sediments in the basin have been identified, since the knowledge of specific areas that contribute sediments to the drainage network is necessary for the study of sediment transport. The results suggest that the general connectivity of the basin has improved over the years and suggest that the steep slopes of the basin completely condition the connectivity index, leaving land uses in the background.
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