Meta-heuristic Optimization Method for the Calibration of Friction Coefficients in 1-D Open Surface Channel Modeling

Experimental and numerical study of unsteady flows in a compound open channel

“…Therefore, there is still a deep interest for improvements in one-dimensional (1D) modelling techniques since 1D models are generally fast enough for those purposes whereas they suffer from a poor modelling of the different terms of head losses − mainly treated as bed-friction head losses as pointed out by Visse et al [7]. The influence of this poor representation of the physical processes is somehow compensated by some calibration techniques that could benefit from numerous routine data [8]. While such calibration processes have been proven to deliver satisfying results in the range of the available calibration data, the predicting capabilities of such calibrated models are still questionable when they are run in situation of very high flows (e.g., for modelling extreme flood events as required for safety studies or hydraulic works conception).…”

“…Interestingly, by optimizing the turbulent exchange coefficient at the MC/FP interface, the ISM was shown to reproduce the water surface elevations as well as a classical calibrated 1D code as reported in Table 1. In the latter, FudaaCrue [8] is the operational code developed by Compagnie Nationale du Rhône (C.N.R), and based on the Divided Channel Method (DCM) [42] to address overbank flows. MAGE is a research code developed by INRAE that can be coupled either with the DEBORD method [9]-a corrected DCM accounting for the turbulent exchange between MC and FP−, or with the 1D+ISM [1] to model CC flows.…”