Avidesh Seenath
Effects of DEM Resolution on Modeling Coastal Flood Vulnerability
Seenath, Avidesh
Authors
Abstract
This article examines whether Digital Elevation Model (DEM) resolution affects the accuracy of predicted coastal inundation extent using LISFLOOD-FP, with application to a sandy coastline in New Jersey. DEMs with resolution ranging from 10 to 100 m were created using coastal elevation data from NOAA, using the North American Vertical Datum of 1988. A two-dimensional hydrodynamic flood model was developed in LISFLOOD-FP using each DEM, all of which were calibrated and validated against an observed 24-h tidal cycle and used to simulate a 1.5 m storm surge. While differences in predicted inundated area from all models were within 1.0%, model performance and computational time worsened and decreased with coarser DEM resolution, respectively. This implied that using a structured grid model for modeling coastal flood vulnerability is based on two trade-offs: high DEM resolution coupled with computational intensity, but higher precision in model predictions, and vice versa. Furthermore, water depth predictions from all DEMs were consistent. Using an integrated numerical modeling and GIS approach, a two-scale modeling strategy, where a coarse DEM is used to predict water levels for projection onto a fine DEM was found to be an effective, and computationally efficient approach for obtaining reliable estimates of coastal inundation extent.
Citation
Seenath, A. (2018). Effects of DEM Resolution on Modeling Coastal Flood Vulnerability. Marine Geodesy, 41(6), 581-604. https://doi.org/10.1080/01490419.2018.1504838
Journal Article Type | Article |
---|---|
Acceptance Date | Jul 22, 2018 |
Online Publication Date | Oct 23, 2018 |
Publication Date | Oct 23, 2018 |
Deposit Date | Feb 7, 2019 |
Publicly Available Date | Mar 28, 2024 |
Journal | Marine Geodesy |
Print ISSN | 0149-0419 |
Electronic ISSN | 1521-060X |
Publisher | Taylor and Francis Group |
Peer Reviewed | Peer Reviewed |
Volume | 41 |
Issue | 6 |
Pages | 581-604 |
DOI | https://doi.org/10.1080/01490419.2018.1504838 |
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Copyright Statement
This is an Accepted Manuscript of an article published by Taylor & Francis in Marine geodesy on 23 October 2018 available online: http://www.tandfonline.com/10.1080/01490419.2018.1504838
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