Author(s): S. Wang; P. Lu; M. Lepparanta; Q. Wang; Z. Li
Linked Author(s): Peng Lu
Keywords: Sheltering effect; Ice ridges; Ice-ocean drag force; Laboratory experiment; Numerical simulation
Abstract: The sheltering effect between adjacent ice ridges needs to be accounted for in the parameterisation of the form drag of ridges. Both laboratory measurements and numerical simulation were conducted to explore the sheltering effect between ridges of various geometries. The key parameters were the ratio between keel spacing and keel depth L/H, flow velocity u, and keel slope angle α. In the laboratory experiment, the sheltering coefficient Г = F1/ F2 (the ratio of the drag force on the upstream ang downstream keel) increased with increasing L/H, decreased remarkably with steepening α and was independent of u. Based on the comparison between laboratory experiment and numerical simulation results, the developed numerical models were validated and improve the results from the water tank, providing us more accurate values and the variation pattern. It is providing new insight for improving the parametrisation scheme of ice-ocean drag coefficient sea ice dynamics models.
Year: 2024