***Accounting for tropical cyclones more than doubles the global population exposed to low-probability coastal flooding***
Authors: Dullaart, J.C.M., Muis, S., Bloemendaal, N., Chertova M.V., Couasnon, A. & Aerts, J.C.J.H.
Institute for Environmental Studies, Faculty of Science, Vrije Universiteit Amsterdam

Corresponding Author: Dullaart, J.C.M.

Contact Information: job.dullaart@vu.nl

Vrije Universiteit Amsterdam - Institute for Environmental Studies
De Boelelaan 1111
1081 HV Amsterdam
The Netherlands

***General Introduction***
Storm surges that occur along low-lying, densely populated coastlines can leave devastating societal, economical, and ecological impacts. To protect coastal communities from flooding, return periods of storm tides, defined as the combination of the surge and tide, must be accurately evaluated. Here we present storm tide return periods using a novel integration of two modelling techniques. For surges induced by extratropical cyclones, we use a 38-year time series based on the ERA5 climate reanalysis. For surges induced by tropical cyclones, we use synthetic tropical cyclones from the STORM dataset representing 10,000 years under current climate conditions. Tropical and extratropical cyclone surge levels are probabilistically combined with tidal levels, and return periods are computed empirically. The COAST-RP dataset contains storm tide levels representing the 1, 2, 5, 10, 25, 50, 100, 250, 500, and 1000-year return period.

***Description of the data in this data set***
The data included in this netcdf data set has been organised per output location (coordinates) of the hydrodynamic model and includes the following:
- Coordinates
	- station_x_coordinate 	= longitude
	- station_y_coordinate 	= latitude

- Data variables:
	- station_id 			= name of output location in the hydrodynamic global tide and surge model (GTSM)
	- storm_tide_rp_0001 	= storm tide level with a 1 year return period
	- storm_tide_rp_0002 	= storm tide level with a 2 year return period
	- storm_tide_rp_0005 	= storm tide level with a 5 year return period
	- storm_tide_rp_0010 	= storm tide level with a 10 year return period
	- storm_tide_rp_0025 	= storm tide level with a 25 year return period
	- storm_tide_rp_0050 	= storm tide level with a 50 year return period
	- storm_tide_rp_0100 	= storm tide level with a 100 year return period
	- storm_tide_rp_0250 	= storm tide level with a 250 year return period
	- storm_tide_rp_0500 	= storm tide level with a 500 year return period
	- storm_tide_rp_1000 	= storm tide level with a 1000 year return period

- Attributes
	- title					= COAST-RP (COastal dAtaset of Storm Tide Return Periods)
	- summary				= Storm tide is defined as the sum of the storm surge and tidal levels. Tropical cyclone tracks from the STORM dataset and extratropical cyclones from the ERA5 climate reanalysis produced by the ECMWF are used as forcing. Hydrodynamic simulations are carried out with the Global Tide and Surge Model (GTSM).
	- source				= DFLOWFM / ERA5 climate reanalysis / STORM
	- model_version			= Deltares, D-Flow FM Version 1.2.63.64757
	- geospatial_lat_min	= -90
	- geospatial_lat_max	= 90
	- geospatial_lat_units	= degrees_north
	- geospatial_lon_min	= -180
	- geospatial_lon_max	= 180
	- geospatial_lon_units	= degrees_east
	- geospatial_vertical_units = m
	- geospatial_vertical_positive = up
	- institution			= IVM - VU Amsterdam
	- creator_email			= job.dullaart@vu.nl
	- date_created			= Thu Jun 3 09:42:21 2021