Co-conception of flood management solutions: riverscapes to facilitate dialog between dry dam designers and biologists
Résumé
If involved late in flood mitigation projects, biologists can suggest only minor changes - a fortiori after the computations are completed. We advocate that conception should be multidisciplinary from the early stages, to ensure a better compromise with biodiversity preservation. Therefore, specialists need to efficiently exchange information and share common conceptual views; riverscapes and their associated biodiversity appeared excellent tools to facilitate discussions. Riverscapes formulate the results of a careful local analysis: biologists propose a hierarchized riverscape typology, including trained reaches, where the potential biodiversity and a rough view of processes are described. Comparing the shift of types caused by different technical solutions will then guide the choices. A riverscape typology was built for Polish mountain rivers. Referring to this typology does facilitate discussions to adapt bed armouring to what is necessary for dry dams and river training, and to discuss further adaptations in cross-sections. Conclusions drawn in one context are not necessarily valid elsewhere; the approach requires to build the typology locally and to organize a multidisciplinary think-tank to come up with relevant operational solutions in a reasonable time lapse. We also trust that riverscapes could be used as a basis for more detailed multidisciplinary research.
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