Title: Evolution in the relation between rainfall and fluvial discharge since 1970 in Esva Basin (NW Spain)
Authors: Elena Fernandez Iglesias - University of Oviedo (Spain) [presenting]
Gil Gonzalez-Rodriguez - University of Oviedo (Spain)
Jorge Marquinez - University of Oviedo (Spain)
Maria Fernandez-Garcia - University of Oviedo (Spain)
Abstract: The river channel in the Esva basin, a coastal catchment of the Cantabrian region (North Iberian Peninsula) with a surface of 464 km2 and maximum high close to 1300 m, has experienced riverbed's incision, channel narrowing, vegetal colonization and loss of active gravels. This trend has been described in other rivers from Spain and Europe, and they could been linked to a general decrease in sediment supply after land-use changes and/or hydrological changes in rainfall and fluvial discharge. In the latter case, a statistical analysis of the relation between rainfall and fluvial discharge since 1970 is carried out. The impact of the recorded precipitations on the fluvial discharge is analysed based on lagged dependent variable models for different scenarios, trying to detect if there are important hydrological changes.