A reduced-complexity numerical model, LX-Shore, is developed to simulate shoreline evolution along wave-dominated sandy coasts. The model can handle any sandy shoreline geometries (e.g. sand spits, islands), including non-erodible areas such as coastal defenses and headlands, and is coupled with a spectral wave model to cope with complex nearshore wave fields. Shoreline change is primarily driven by the gradients in total longshore sediment transport and by the cross-shore transport owing to variability in incident wave energy. Application to academic cases and a real coast highlights the potential of LX-Shore to simulate shoreline change on timescales from hours (storm) to decades with low computational cost. LX-Shore opens new perspectives in terms of knowledge on the primary mechanisms locally driving shoreline change and for ensemble-based simulations of future shoreline evolution.

建立了复杂度降低的数值模型LX-Shore，以模拟沿波为主的沙质海岸的海岸线演化。该模型可以处理任何沙质海岸线几何形状（例如，沙嘴，岛屿），包括诸如海岸防御和岬角之类的非易蚀区域，并且可以与频谱波模型结合使用，以应对复杂的近岸波场。海岸线变化主要是由总的沿岸沉积物输运的梯度和由于入射波能量的可变性引起的跨岸输运所驱动。在学术案例和真实海岸上的应用突出了LX-Shore在模拟小时（风暴）到数十年的时间尺度上以低计算成本模拟海岸线变化的潜力。