RT Journal Article
T1 Morfología de perfiles de ríos en roca. Control tectónico y significado evolutivo en el Bajo Guadiana
T1 Longitudinal profiles in bedrock rivers. Tectonic controls and landscape evolution significance in the LowerGuadiana River
A1 Garzón Heydt, Guillermina
A1 Ortega, J.A.
A1 Garrote, J.
AB Bedrock rivers are increasingly becoming of interest due to their significance in controlling upstreamentrenchment by fixing the base level. Longitudinal profiles are dependant not only of discharge but alsoon incision capability due to bedload transport thresholds determined by gradient availability. The lowerGuadiana River incises into the large Extremadura-Alentexo planation surface, developing large canyoncarved on extended flat rocky benches with internal channels. Their development cannot be understoodas that of simple hydrodynamic features produced and backwards erosion by lithologic control. In orderto determine drainage network evolution in relation to regional surfaces and tectonics, longitudinal profilesriver profiles from the Guadiana River and its tributaries have been reconstructed and their concavityindex and mathematical fitting curves analysed. Different reaches might be interpreted on a morphostructuralframework, with convex river profiles adjusting to active base level lowering as compared to the morestable and better evolved upstream rivers. To explain the convexity towards the south, one must considerthe subsidence of the Guadalquivir flexure, which coincides roughly with the Guadiana mouth
YR 2008
FD 2008
LK http://hdl.handle.net/10272/8280
UL http://hdl.handle.net/10272/8280
LA spa
DS Repositorio Institucional de la Universidad de Huelva
RD 31 may 2026