Global Coastal Total Water Level Variability and Exceedance Statistics (1958–2023)

This dataset provides global monthly statistics of coastal total water levels (TWL) and associated exceedance metrics for the period January 1958 to December 2023. The Total Water Level (TWL) is defined as the sum of Sea Level Anomaly (SLA), wave runup (R), and tide (T). The dataset includes: Monthly means and monthly maxima of each component (SLA, R, T) and their sum (TWL). The variable hoursovertopmonthly, representing the number of hours per month during which the cumulative hourly TWL exceeds a given percentage (1–100%) of the maximum coastal elevation within the first kilometer inland. Spatial coordinates (lat, lon) for 14,140 global coastal sample points derived from the SamplePoints_coarse_mix dataset. Wave runup (R) is estimated using the Stockdon et al. (2006) empirical parameterization, and coastal elevation references are taken from multiple global elevation datasets (ALOS/JAXA, Panos, FLOPROS). This dataset is intended to support global and regional analyses of coastal flooding hazards, sea level variability, and wave-tide-surge interactions across multi-decadal time scales.