Sea Level Rise: American Samoa: High-Tide Flooding: 2100 Intermediate Scenario

Description

This high-tide flooding layer provides a prediction of future sea level rise (SLR) inundation and was produced using a passive flooding model, often referred to as a "bathtub" model. It provides an assessment of flooded areas according to a specific water level. These water levels are determined using projections from the U.S. Interagency Task Force (ITF) (Sweet et al., 2022) in combination with land subsidence projections modeled by Han et al. (2019). The latter is included only for Tutuila, Aunuu, and Manua Islands (Ofu, Olosega, and Tau). In contrast, SLR projections for Swains Island and Rose Atoll only include the climate-related processes (ITF). The projections are modeled following both scenarios and time. The five scenarios range from low to high depending on the amount of greenhouse gases emissions, while time is divided by decade from 2030 to 2100. We apply this model to the 2022 National Geodetic Survey (NGS) lidar DEM for American Samoa with 1-meter resolution. The DEM was leveled from NAD83 (PA11) to mean sea level at 0 m (MSL=0) in 2005. The adjustment of the DEM may lead to inaccuracies due to the lack of historic information. It is also important to acknowledge that any inaccuracies in the DEM will lead to inaccuracies in the flooding estimates. In the 2100 intermediate scenario represented here, the modeled water level is 136 cm (99 cm for Rose and Swains). In this scenario, world-wide society continues current emissions rates, and sea level rises at increased rates compared to the intermediate-low scenario. Tipping points, i.e. large and sudden changes, are still not crossed. It is recommended using this scenario for planning construction of infrastructure with low-to-medium critical use and lifespans extending into the second half of the century, such as a new storefront. Flood depth is provided in centimeters above the 2005 mean higher high water (MHHW) tide level. It is essential to emphasize that the passive flooding model used to produce this data layer does not include the effects of waves on flooding. As a result, the extent and impacts of future flooding under high-wave conditions are not represented, which should be accounted for in planning efforts. In addition, the DEM is assumed to be unchanged as sea level rises, but in fact there will be erosion and changes in the shape of the land surface, and continued subsidence. This also must be considered, and it is best practice to consider any flooding extent or depth represented in this data layer as a best-case scenario, with the effects of dynamic shoreline processes leading to greater flood extent and depth than presented.

Resources

Name Format Description Link
27 http://pacioos.org
27 http://pacioos.org
0 This URL provides a viewer for this dataset. http://geo.pacioos.hawaii.edu/geoexplorer/
0 This URL provides a viewer and/or data access for this dataset. http://pacioos.org/shoreline/slr-amsam/
0 This URL provides access to this dataset via GeoServer, which offers multiple output formats and an OpenLayers viewer. http://geo.pacioos.hawaii.edu/geoserver/
51 Open Geospatial Consortium Web Feature Service (WFS). Supported WFS versions include 1.0.0, 1.1.0, and 2.0.0. Supported output formats include CSV, GeoJSON, GeoJSON-P, GML, KML, and Shapefile (Zipped). http://geo.pacioos.hawaii.edu/geoserver/PACIOOS/as_uhslc_all_slr_flood_2100_int_v2/ows?service=WFS&version=1.0.0&request=GetCapabilities
0 NOAA National Geodetic Survey (NGS). 2022. NOAA NGS Topobathy Lidar DEM of Rose Atoll, American Samoa. NOAA National Centers for Environmental Information (NCEI). https://www.fisheries.noaa.gov/inport/item/72133
0 NOAA National Geodetic Survey (NGS). 2022. NOAA NGS Topobathy Lidar DEM of Swains Island, American Samoa. NOAA National Centers for Environmental Information (NCEI). https://www.fisheries.noaa.gov/inport/item/72139
0 NOAA National Geodetic Survey (NGS). 2022. NOAA NGS Topobathy Lidar DEM of Ta'u, American Samoa. NOAA National Centers for Environmental Information (NCEI). https://www.fisheries.noaa.gov/inport/item/72142
0 NOAA National Geodetic Survey (NGS). 2022. NOAA NGS Topobathy Lidar DEM of Tutuila, American Samoa. NOAA National Centers for Environmental Information (NCEI). https://www.fisheries.noaa.gov/inport/item/72145
0 https://uhslc.soest.hawaii.edu
0 https://uhslc.soest.hawaii.edu
0 https://uhslc.soest.hawaii.edu
27 http://pacioos.org
0 NOAA National Geodetic Survey (NGS). 2022. NOAA NGS Topobathy Lidar DEM of Ofu and Olosega, American Samoa. NOAA National Centers for Environmental Information (NCEI). https://www.fisheries.noaa.gov/inport/item/72129
0 https://uhslc.soest.hawaii.edu
0 NOAA National Geodetic Survey (NGS). 2022. NOAA NGS Topobathy Lidar DEM of Tutuila, American Samoa. NOAA National Centers for Environmental Information (NCEI). https://www.fisheries.noaa.gov/inport/item/72145
0 NOAA National Geodetic Survey (NGS). 2022. NOAA NGS Topobathy Lidar DEM of Swains Island, American Samoa. NOAA National Centers for Environmental Information (NCEI). https://www.fisheries.noaa.gov/inport/item/72139
27 http://pacioos.org
0 https://uhslc.soest.hawaii.edu
0 https://uhslc.soest.hawaii.edu
27 http://pacioos.org
0 https://uhslc.soest.hawaii.edu
0 https://uhslc.soest.hawaii.edu
27 http://pacioos.org
0 NOAA National Geodetic Survey (NGS). 2022. NOAA NGS Topobathy Lidar DEM of Ta'u, American Samoa. NOAA National Centers for Environmental Information (NCEI). https://www.fisheries.noaa.gov/inport/item/72142
52 Open Geospatial Consortium Web Map Service - Cached (WMS-C). Use of WMS-C is similar to traditional WMS but with the addition of the "tiled=true" parameter, which triggers GeoServer to pull map tiles from GeoWebCache if they have been previously generated. This can dramatically improve performance, especially for larger datasets. Supported map formats include JPEG and PNG. Supported info formats include GeoJSON, GML, HTML, and plain text. http://geo.pacioos.hawaii.edu/geoserver/PACIOOS/gwc/service/wms?service=WMS&version=1.1.1&request=GetCapabilities&tiled=true
0 NOAA National Geodetic Survey (NGS). 2022. NOAA NGS Topobathy Lidar DEM of Rose Atoll, American Samoa. NOAA National Centers for Environmental Information (NCEI). https://www.fisheries.noaa.gov/inport/item/72133
52 Open Geospatial Consortium Web Map Service (WMS). Supported WMS versions include 1.1.1 and 1.3.0. Supported map formats include AtomPub, GeoRSS, GeoTIFF, GIF, JPEG, KML/KMZ, PDF, PNG, SVG, and TIFF. Supported info formats include GeoJSON, GeoJSON-P, GML, HTML, and plain text. http://geo.pacioos.hawaii.edu/geoserver/PACIOOS/as_uhslc_all_slr_flood_2100_int_v2/ows?service=WMS&version=1.3.0&request=GetCapabilities
0 This URL provides access to this dataset via GeoServer, which offers multiple output formats and an OpenLayers viewer. https://geo.pacioos.hawaii.edu/geoserver/
0 This URL provides a viewer and/or data access for this dataset. http://pacioos.org/shoreline/slr-amsam/
0 NOAA National Geodetic Survey (NGS). 2022. NOAA NGS Topobathy Lidar DEM of Ofu and Olosega, American Samoa. NOAA National Centers for Environmental Information (NCEI). https://www.fisheries.noaa.gov/inport/item/72129
0 https://uhslc.soest.hawaii.edu
27 http://pacioos.org
0 https://uhslc.soest.hawaii.edu
27 http://pacioos.org
52 Open Geospatial Consortium Web Map Service - Cached (WMS-C). Use of WMS-C is similar to traditional WMS but with the addition of the "tiled=true" parameter, which triggers GeoServer to pull map tiles from GeoWebCache if they have been previously generated. This can dramatically improve performance, especially for larger datasets. Supported map formats include JPEG and PNG. Supported info formats include GeoJSON, GML, HTML, and plain text. https://geo.pacioos.hawaii.edu/geoserver/PACIOOS/${id}/ows?service=WMS&version=1.1.1&request=GetCapabilities&tiled=true
51 Open Geospatial Consortium Web Feature Service (WFS). Supported WFS versions include 1.0.0, 1.1.0, and 2.0.0. Supported output formats include CSV, GeoJSON, GeoJSON-P, GML, KML, and Shapefile (Zipped). https://geo.pacioos.hawaii.edu/geoserver/PACIOOS/as_uhslc_all_slr_flood_2100_int_v2/ows?service=WFS&version=1.0.0&request=GetCapabilities
52 Open Geospatial Consortium Web Map Service (WMS). Supported WMS versions include 1.1.1 and 1.3.0. Supported map formats include AtomPub, GeoRSS, GeoTIFF, GIF, JPEG, KML/KMZ, PDF, PNG, SVG, and TIFF. Supported info formats include GeoJSON, GeoJSON-P, GML, HTML, and plain text. https://geo.pacioos.hawaii.edu/geoserver/PACIOOS/as_uhslc_all_slr_flood_2100_int_v2/ows?service=WMS&version=1.3.0&request=GetCapabilities

Tags

  • human dimensions
  • sea level rise
  • swains
  • manua
  • inundation
  • oceans
  • pacioos
  • american samoa
  • tutuila
  • aunuu
  • pacific islands ocean observing system
  • rose atoll
  • olosega
  • earth science
  • environmental impacts
  • ofu
  • ocean
  • climate indicators
  • atmospheric/ocean indicators
  • polynesia
  • coastal processes
  • floods
  • pacific ocean
  • tau
  • natural hazards
  • south pacific ocean

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