Sustainable Management of the Navigability of Natural Rivers (PIANC WG 236)

Abstract The PIANC InCom/EnviCom Working Group 236 was established in early 2021 to develop guidelines for improving navigability conditions on natural or quasi-natural rivers, while maintaining morphological processes and river form function. Its key objectives include: 1) development of improve maintain the rivers; 2) assess sustainability training works designed navigability; 3) dynamic management (monitoring shifting navigation aids adapt channel dynamics); 4) highlight technical, operational, economic environmental considerations rivers compared that regulated canals; 5) understanding physical developed with without works. guidance includes a planning framework developing improvement masterplan system, integrated adaptive strategies can be applied at system scale. Specific interventions measures have been identified meet dual goals function conditions. These include charting; dredging disposal management; Temporary, Adaptable, Flexible Training Structures (TAFTS); riverbed armoring sediment nourishment; rock excavation; meander cutoffs oxbow development; localized traditional structures; closure structures. impacts mitigation associated some are analyzed discussed. Finally, continual monitoring, management, operational tools available morphologically active is presented. It recognized will typically more fluvially than systems used methods improvements including heavily trained locks dams. unrestricted unconfined systems, therefore, require new innovative monitor fluvial geomorphic changes order inform managers navigators river. Case studies presented Madeira River (Brazil); Magdalena (Colombia); Niger Delta (Nigeria); Yangtze (China); Brahmaputra-Jamuna (India); Red (Vietnam).