Uncertainties in Riverine and Coastal Flood Impacts under Climate Change

Climate change can affect different drivers of flooding in low-lying coastal areas the world, challenging design and planning communities infrastructure. The concurrent occurrence multiple flood such as high river flows extreme sea levels aggravate impacts result catastrophic damages. In this study, individual compound effects riverine are investigated at Stephenville Crossing located coastal-estuarine region Newfoundland Labrador (NL), Canada. climate on extents depths uncertainties associated with temporal patterns storms, intensity–duration–frequency (IDF) projections, spatial resolution, emission scenarios assessed. A hydrologic model a 2D hydraulic set up calibrated to simulate inundation for historical (1976–2005) well near future (2041–2070) far (2071–2100) periods under Representative Concentration Pathways (RCPs) 4.5 8.5. Future storm events generated based projected IDF curves from convection-permitting Weather Research Forecasting (WRF) simulations, using SCS, Huff, alternating block methods. results compared simulations derived statistically downscaled Global Models (GCMs). Both intensify future, resulting higher risks study area. Compound more severe inundation, affecting coastline estuary Results show that hyetographs considerable, which indicate importance accurate representation patterns. Further, WRF-IDF ones GCM-IDFs.