Flash floods in mountainous areas produce a great impact on society. The high flow energy, the mobilized material and the velocity involved in those streams make the aforementioned events extremely dangerous. The necessity of facing the risk assessment due to flood is motivated by the European Floods Directive that requires local authorities to complete risk management plans. The lack of knowledge we actually have in fluvial morpho-dynamics is wide, as testified by the event of July 2013 in Vall dAran (Northeast of Spain). This project aims to open a new investigation topic to study the fluvial morpho-dynamic of mountain streams. Often, the most popular studies in streams deal with rivers, but in mountain creeks a lack of literature is detected. It is remarked that this study concerns fluvial morphodynamics and not simply fluvial dynamics. The difference is that, besides the bedload, it has the morphological changes of the stream have to be considered. This is the key point of the approach: introducing the evaluation of the changes in width and the bed-forms during the flood. It seems that the mountain stream flow depends on the critical flow, the one able to transport the maximum flow with the minimum specific energy. Every change in the streams occurred due to the dominant flow provokes stream deformations or sediment transport, changing the roughness to maintain the stage of the so-called quasi-critical flow. This is the main point of the research line of this project: reaching the limit of the incipient movement of bed particles and working on the associated critical stresses.
Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016
Programa Estatal de Fomento de la Investigación Científica y Técnica de Excelencia
Subprograma Estatal de Generación de Conocimiento
Excelencia: Proyectos I+D
Gobierno De España. Ministerio De Economía Y Competitividad, Mineco