Fig. 4.

Marsh boundary migration rate (positive if retreating) as a function of marsh basin width. Points are data from the three sites (Fig. 1 and Table S2). Lines are model results, for different values of C_o, RSLR and U_wind, r = 1.4 m, k_e = 0.1 m³·y⁻¹·W⁻¹, k_a = 2.