Silting in the Grand Canal in the Domain of Chantilly (Oise, France)—Catchment-Scale Hydrogeomorphological Reconnaissance and Local-Scale Hydro-Sedimentary Transport Modelling

The domain of Chantilly (Oise, France) includes a castle and garden, both dating from the eighteenth century, which are seen as important legacies France’s history. Nowadays, 2.5 km canal that runs through is subject to phenomenon silting, leading accumulation sediments within linked proliferation algae, has dissuasive effect among visitors. HEC-RAS software (Hydrologic Engineering Centers River Analysis System, US army corps Engineers, Washington, D.C., USA) was used model understand sediment canal. This widely in literature tackling transport accumulation, allows forecasting stretches most susceptible accumulation. simulation results highlight an near entrance Nonette stream into propagation total accumulated volume assessed by between 2001 2010 equals 3901 m3, when reconnaissance catchment showed not limiting factor. However, volumes determined underestimated, matter brought vegetation or other systems different river (e.g., wind, rainfall) considered calculation. quantity also uncertainties, bathymetry available.