Analysis of non-linear inundation from sea-level rise using LIDAR data: a case study for South Florida |
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| Authors: | Keqi Zhang |
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| Institution: | (1) Broward County Environmental Protection Department, 1 University Drive, Plantation, FL 33324, USA;(2) National Coral Reef Institute, Nova Southeastern University Oceanographic Center, 8000 N. Ocean Drive, Dania, FL 33004, USA;(3) Marine Science Center, University of South Florida, 140 7th Avenue S, St. Petersburg, FL 33701, USA;(4) Institut fuer Erdwissenschaften, Karl-Franzens-Universitaet Graz, Heinrichstrasse 26, 8020 Graz, Austria |
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| Abstract: | By analyzing a digital elevation model (DEM) derived from airborne light detection and ranging (LIDAR) data and airborne height
finder measurements, this study demonstrates that a 1.5 m sea-level rise by 2100 would cause inundation of large areas of
Miami-Dade County, southern Broward County, and Everglades National Park. Inundation processes are non-linear: inundation
is gradual before reaching a threshold, and speeds up rapidly afterwards due to the regional topography. Accelerated sea-level
rise will cause the threshold to be reached sooner by amplifying the non-linear inundation, and must be considered in policy-making.
Comparison of inundated areas extracted from 30 m LIDAR and USGS DEMs indicates that the vertical accuracy of a DEM has a
great effect on delineation of inundation areas. For a 1.5 m sea-level rise, the inundated area delineated by USGS DEM for
Broward County is 1.65 times greater than that indicated by the LIDAR DEM. |
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