Preliminary Results

Historical Aerial Photographs were post-processed to extract point clouds. Morphological changes at multiple temporal scales were investigated. The links between flood magnitude and frequency and human-based channel perturbations were analysed at long term temporal scales. Following we present some preliminary results we obtained (based on the Master project of Manel Llena, 2015).


Figure 1. Morphological changes since 1927.




Figure 2. Historical and contemporary in-channel gravel mining.






Figure 3. Evolution of the active channel width since 1927.





Figure 4. Braiding intensity evolution.






Figure 5. Historical and contemporary point clouds, DEMs and DoDs.


Several field campaigns
have been performed in order to review the experimental design, test methodologies, install equipment and, finally, to start sampling and monitoring flow hydraulics, channel morphology and topography, sediment transport and ecological diversity (mainly macroinvertebrates although an electrofishing campaign has already been performed). Historical data has been obtained (aerial, macroinvertebrate samples, mining data, flow data, meteorological data).



Figure 6. Mean daily flow and field campaigns performed since June 2013 to December 2015.



Additionally, an intensive field work campaign was performed to study teh effetcs of a gravel mining on sediment transport, bed morphology and macroinvertebrate drift at multiple temporal and spatial scales (see Information Sheet Vol. 2 for more details).


Figure 7. Effetcs of a gravel mining on sediment transport, bed morphology and macroinvertebrate drift.





Figure 8. Effetcs of a gravel mining on sediment transport, bed morphology and macroinvertebrate drift.












Figure 9. Examples of photorendered point clouds obtained from automatic digital photogrametry (SfM).


An electro fishing campaign was performed in autumn 2013 and a report has been elaborated. This work was done by Gesna S.L.


Figure 10. A report with all data from the electrofishing is available.