Multi-decadal simulation of estuarine sedimentation under sea level rise with a response-surface surrogate model

•Estuarine sedimentation is a complex physical process.•High-fidelity model runtimes hinder multi-decadal simulation.•A response surface surrogate model estimated multi-decadal basin depths.•Surrogate model was orders of magnitude faster compared to high-fidelity model.•Surrogate model was able to attain equivalent accuracy to high fidelity model.