Hydrological and geomorphic effects upstream of the Cantillana Dam along the Guadalquivir River (southern Spain)
| Autor: | Rafael Baena-Escudero, Massimo Rinaldi, Inmaculada C. Guerrero-Amador, Alberto González-Sayago |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Hydrology
Upstream (petroleum industry) geography geography.geographical_feature_category 010504 meteorology & atmospheric sciences Flood myth 010502 geochemistry & geophysics 01 natural sciences Siltation Aggradation Tributary Alluvium Topography Geology Channel (geography) 0105 earth and related environmental sciences Earth-Surface Processes |
| Zdroj: | Geomorphology. 388:107786 |
| ISSN: | 0169-555X |
| DOI: | 10.1016/j.geomorph.2021.107786 |
| Popis: | Hydrological and geomorphological impacts upstream dams have been less frequently investigated than those occurring downstream. Geomorphological mapping, multitemporal analysis of aerial photos, topographic survey comparison of the channel bed, and archives of information concerning flood events were used in this paper to document the effects that occurred upstream of the Cantillana Dam along the lower Guadalquivir River. The results show that the construction of the dam in 1956 caused progressive siltation that reduced either the water surface width (36.5% until 2010) or the reservoir volume (70% reduction until 2012). These changes decrease from the upstream boundary of the reservoir to the dam but show an increase in correspondence with the main tributary (Rivera de Hueznar) in the middle part. The aggradational process along the reservoir reach caused a reduction in the channel cross-sectional area and its flow capacity during floods. Consequently, higher river stages are reached for the same flow discharge, thereby producing an increased frequency and duration of inundation of the alluvial terraces adjacent to the reservoir. |
| Databáze: | OpenAIRE |
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