Post-tropical cyclone Ida (2021) flood map for New York City’s Jamaica Bay watershed
Description
We present the first spatially continuous flood map of Hurricane Ida, which covers the Jamaica Bay watershed in New York City. This dataset represents a research effort to simulate the impact of Hurricane Ida in a coupled coastal framework, providing an estimated flood depth map. This interpolated flood map was developed using modeled peak water elevations combined with a high-resolution 30 cm DEM. Key Considerations: The model’s 20 cm root-mean-squared error represents the uncertainty in flood depths and is based on a calibration process that utilized two storms and high watermarks at 18 locations. Furthermore, the dataset was created with simplified hydrodynamic modeling on an approximately 50-meter resolution grid that neglects the presence of buildings and does not explicitly represent the stormwater sewer system. A calibrated spatially- and temporally constant “drain rate” represents the stormwater system drainage and infiltration across the domain. These simplifications were made to streamline the model but may lead to localized biases, particularly in areas with complex drainage and diverse land use. During extreme events like Ida, where stormwater systems can be overwhelmed, these assumptions are likely to have less impact. For more detailed insights and methodology, please refer to the accompanying paper (see related links below).
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Steps to reproduce
For more information on the methods, please see the paper (https://doi.org/10.5194/egusphere-2024-2058).