A TC hazard dataset for wind and surge was created for 1980-2020. The wind hazard dataset is based on the global International Best Track Archive for Climate Stewardship (IBTrACS) (Knapp et al. 2010) which includes 269-recorded events making landfall in Vietnam. Holland 2008 elaborates the internal methodologies of CLIMADA for wind field and the surge hazard dataset (flood depth) is derived from wind intensity with a linear relationship that modifies the water level according to the local elevation and distance to the coastal line (Xu 2010). The hazard dataset is created on an irregular grid with: 30 arcsecond (~1km2) resolution along the coastline and going 50km inland as well as over major population centres, which cover more than 95 percentile of the population; and a coarser resolution of 150 arcsecond for the rest of the country. To account for uncertainties and model sensitivity, each historic TC is resampled 100 times creating a large sample of stochastic events (a representative set of simulated events and process is detailed in Aznar-Siguan and Bresch 2019). For simulating surge, Climate Central's proprietary, high-accuracy Digital Elevation Model (DEM) known as CoastalDEM (Kulp and Strauss 2018) was used at a resolution of 90 arcsecond. It reduces median errors in NASA's SRTM3 DEM to near zero and thus allows a better understanding of coastal risk. High accuracy DEMs from airborne lidar are unavailable. The future hazard dataset is created for the future Representative Concentration Pathways (RCP) RCP8.5- The future climate scenarios are simulated through CLIMADA’s TC module but based on assumptions from Knutson et al. 2015, which stipulate increased intensity and reduced frequency of TCs in the Eastern Pacific basin for the RCP8.5 scenario by 2050. Further sea level rise was accommodated within the future scenarios with 30 cm rise in North-western Pacific basin according to sea level project tool published by NASA.

Tropical cyclone storm surges probabilistic event dataset for 2020 and 2050 under the climate change scenario RCP8.5.