DOI: 10.5281/zenodo.17986627
title: Multi-Scenario Flood Simulations Dataset for 2023 ex-Tropical Cyclone Gabrielle in Tairāwhiti, Aotearoa New Zealand

description: This Zenodo repository contains a numerical flood modelling dataset of the 2023 ex-Tropical Cyclone Gabrielle event for 11 simulation domains within the Tairāwhiti Regional District, Aotearoa New Zealand. It represents Part 1 of 2 of a regional modelling dataset covering both the Tairāwhiti and Hawke’s Bay regional districts created under the "Rapid Flood Hazard Assessment and Modelling for Cyclone Gabrielle Recovery" project.

Domain delineation and model input files were generated using a workflow pipeline developed by Earth Sciences New Zealand (ESNZ, ex-NIWA) as part of the five-year research project "Mā te haumaru o ngā puna wai o Rākaihautū ka ora mō ake tonu: Increasing Flood Resilience Across Aotearoa New Zealand" (https://niwa.co.nz/hazards/ma-te-haumaru-o-nga-puna-wai-o-rakaihautu-ka-ora-mo-ake-tonu). Hydrodynamic simulations were produced using the two-dimensional shallow-water solver BG_Flood.

The dataset includes the base (uncalibrated) model outputs for each domain, as well as calibrated models and scenario-specific outputs where available. Scenario v1 always refers to the uncalibrated base model for a given domain. Where sufficient validation data were available, calibrated models were created if needed. Calibration focused on correcting hydraulic forcing (rainfall and river injections) and introducing levees breaching where reported. Location specific scenarios were also generated for some domains. The list of domains and scenarios description is provided in README.md.

Each scenario corresponds to a single BG_Flood model run and scenario names follow the convention:<domain_name>_v<version_index>_<scenario_name>

 Each scenario is composed of 5 files representing:- 4 timestamp outputs in NetCDF (<domain_name>_v<version_index>_<scenario_name>_<variable>.nc) format for variable:     . h : Water depth [m],     . u : Velocity (x-direction) [m·s-1],     . v : Velocity (y-direction) [m·s-1],     . zs : Water surface elevation [m], - A compressed zip file (<domain_name>_v<version_index>_<scenario_name>_hmax_Umax_zsmax.zip) containing the derived maximum maps reached at each grid cell over the full simulation period in GeoTIFF format (*.tif) for quantities:    . hmax : Maximum water depth [m],     . Umax : Maximum velocity magnitude [m·s-1],    . zsmax : Maximum water surface elevation [m],

Detailed description of the dataset is available in the README.md. This includes domains list, scenarios description, model description, variable definitions, coordinate reference system, licensing, and citation guidance.

The dataset is intended for:- flood hazard analysis,- methodological comparison and reproducibility,- educational and research purposes.

This data has been prepared by the Earth Sciences New Zealand (ESNZ) for the project purposes. The information contained in this data is derived from multiple data sources, including 3rd party data sources. As there is always uncertainty associated with such data, ESNZ gives no warranties of any kind concerning its assessment and estimates, including accuracy, completeness, timelines or fitness for purpose and accepts no responsibility for any actions taken based on, or reliance placed on them by any person or organisation. ESNZ excludes to the full extent permitted by law any liability to any person or organisation for any loss, damage or expense, direct or indirect, and however caused, whether through negligence  or otherwise, resulting from any person or organisations use of, or reliance on the information contained in this data.