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Salt marshes are intertidal areas with high ecological value because of their biodiversity and protection role of the estuarine coastline. Due to sea-level rise (SLR), the survival of these environments is not guaranteed, increasing the risk of flooding of the surrounding areas. The evolution of salt marshes mainly depends on the balance between sedimentation and SLR rates. A salt marsh evolution model was used to perform simulations with few SLR projections, in order to quantify the variations of these environments in Tróia sandspit. The conclusion is that these areas should be resilient to moderately accelerated SLR projections, but the changes should be quite significant when a more accelerated SLR projection is considered.