3.2.3. One-line models
One-line models are widely used to estimate long-term average changes driven by longshore sediment transport, as exemplified by Pelnard-Considère (1957) and Hanson and Kraus, 1989. These models rely on sediment conservation principles and incorporate empirical longshore transport formulas, accounting for turbulent flow but excluding cross-shore transport dynamics. They assume a stable beach profile shape that shifts either seaward or landward in response to sediment transport during simulations. As a result, one-line models are not suitable for analyzing short-term changes, where cross-shore transport across the beach profile becomes a crucial factor in shoreline evolution.
As of present, the following model is the only one-line model included in IH-SET.
IHCantabria is currently developing another one-line model called CHRONOS, which will numerically model the long-term morphodynamic evolution of the coastline by considering bathymetric surveys, local surveys, and their interaction with the coastline. This tool will exist outside of IH-SET with hopes of eventually extending its availability to the public.
