In November 2022, the Société Hydrotechnique de France organised its first symposium on the interactions between developments on or near watercourses and the quality of the ecosystems that surround them. Three years have gone by, marked by a succession of episodes of severe drought or heavy rainfall, and we invite you to take stock of these issues in a new event for which we have chosen to extend the natural environments to the whole of the land-sea continuum, from rivers to coastal environments and their interfaces, such as estuaries and deltas).
Whether we are talking about streams, rivers, estuaries or coastal fringes, these aquatic environments constitute very specific biodiversity corridors, where the presence of water plays a major role, both in terms of the vital resource it constitutes and the flows of matter it carries or the habitats it shapes. The biodiversity along these corridors, which is both rich and fragile, is highly sensitive to human disturbance; these corridors are also places of refuge, feeding and movement for other communities. In the alluvial valleys, the secondary arms of rivers, hydraulic annexes and marshes are of particular interest because of their ecological richness; in coastal areas, wetlands, bays, deltas and estuaries, foreshores, mudflats and dune zones also have their own specific features.
Developments along these biodiversity corridors, whether for industrial, protection or leisure purposes, or even restoration work, interact locally with the environment in all spatial directions, but also on a larger scale along the main axis of these corridors. This is the case in alluvial valleys where the flow of rivers leads to strong interactions between upstream and downstream, but also on coastal fringes where natural forces - currents, tides, swell, wind - and coastal transport lead to interactions along the coast.
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