slr_cstl_erosn_2_pt_0_ft

Metadata also available as

Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: University of Hawaii Coastal Geology Group (CGG)
Originator: Charles Fletcher
Publication_Date: 20201130
Title: slr_cstl_erosn_2_pt_0_ft
Edition: 2.0
Geospatial_Data_Presentation_Form: vector digital data
Description:
Abstract:
Studies of historical shoreline change using aerial photographs and survey maps show that 70% of beaches on Kauai, Oahu, and Maui are eroding (receding landward) (Fletcher et al. 2012). Beaches exist in a delicate balance between existing water levels, wave energy, and sand supply. Coastal erosion modeling was conducted for sandy shorelines of Kauai, Oahu, and Maui by the University of Hawaii Coastal Geology Group. The methods are described in Anderson et al. (2015) and Anderson et al. (2018), and combine historical shoreline change data with a model of beach profile response to sea level rise from Davidson-Arnott (2005) in order to estimate probabilities of future exposure to erosion at transects (shore-perpendicular measurement locations) spaced approximately 20 meters apart along the shoreline. The model accounts for localized alongshore variability in shoreline change by incorporating trends from the historical erosion mapping studies. Historical data used to model coastal erosion consisted of: (1) historical shoreline positions and erosion rates measured from high-resolution (0.5 meters) ortho-rectified aerial photographs and NOAA topographic charts dating back to the early 1900s (Fletcher et al. 2012, Romine et al. 2013), and (2) beach profile field survey data (Gibbs et al. 2001, Fletcher et al. 2012). The vegetation line was identified in the most recent aerial photography dating from 2006 to 2008. The output of the modeling is the estimated exposure zone to future erosion hazards. Based on the model and IPCC AR5 RCP8.5 sea level rise scenario, there is an 80% probability that land impacted by erosion would be confined within the exposure zone at that particular time. The exposure zones extend landward from the current-day shoreline (vegetation line) up to the 80% cumulative probability contour from sea level rise at 0.5, 1.1, 2.0, and 3.2 feet, which incorporates the uncertainty (upper and lower bounds) of the IPCC RCP8.5 sea level rise projection. This particular layer depicts coastal erosion using the 2.0-ft (0.5991-m) sea level rise scenario. While the RCP8.5 predicts that this scenario would be reached by the year 2075, questions remain around the exact timing of sea level rise and recent observations and projections suggest a sooner arrival. Assumptions and Limitations: Historical shoreline change data and beach profiles needed to model coastal erosion are available only for sandy shores of Kauai, Oahu, and Maui. Exposure was not modeled for less-erodible rocky coasts and bluffs, though the latter can be prone to sudden failure in some areas. In addition, modeling did not account for: (1) existing seawalls or other coastal armoring in the backshore; (2) increasing wave energy across the fringing reef with sea level rise; (3) possible changes in reef accretion and nearshore sediment processes with sea level rise; and (4) possible changes to sediment supply from future shoreline development and engineering, such as construction or removal of coastal armoring or other coastal engineering. Users of these data should cite the following publications: Anderson, T.R., Fletcher, C.H., Barbee, M.M., Romine, B.R., Lemmo, S., and J.M.S. Delevaux (2018). Modeling multiple sea level rise stresses reveals up to twice the land at risk compared to strictly passive flooding methods, Scientific Reports, 8:14484, doi: 10.1038/s41598-018-32658-x. Anderson, T.R., Fletcher, C.H., Barbee, M.M., Frazer, L.N., and B.M. Romine (2015). Doubling of Coastal Erosion Under Rising Sea Level by Mid-Century in Hawaii, Natural Hazards, doi:10.1007/s11069-015-1698-6. For further information, please see the Hawaii Sea Level Rise Vulnerability and Adaptation Report: https://climate.hawaii.gov/wp-content/uploads/2019/02/SLR-Report_Dec2017-with-updated-disclaimer.pdf 2020 Data Update (Version 2.0): Historical shoreline change rates were recalculated for Kauai, Oahu, and Maui with the addition of a new historical shoreline position (ca. 2014-2018, depending on location) to the database of previously existing historical shoreline positions. The erosion models were then recalculated using the updated historical change rates. The addition of the new shoreline generally has a more pronounced influence on study areas with high seasonal or inter-annual variability in shoreline position. In addition to changes in the landward extent of the erosion exposure areas, the seaward edge of updated erosion exposure polygons does not match up with the previous (2017) erosion projections. This is because the seaward edge of the 2017 data is defined by a Special Management Area Shoreline boundary, whereas the seaward edge of the updated 2020 data is defined by the location of a vegetation line (11/2020).
Purpose:
Estimated coastal erosion, modeled using a 2.0 foot sea level rise scenario.
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -159.788519
East_Bounding_Coordinate: -156.332470
North_Bounding_Coordinate: 22.229923
South_Bounding_Coordinate: 20.624597
Keywords:
Theme:
Theme_Keyword_Thesaurus: GCMD Science Keywords
Theme_Keyword:
Earth Science > Climate Indicators > Atmospheric/Ocean Indicators > Sea Level Rise > Inundation
Theme_Keyword: Earth Science > Oceans > Ocean Waves > Wave Runup
Theme_Keyword: Earth Science > Human Dimensions > Environmental Impacts
Theme_Keyword: Earth Science > Human Dimensions > Natural Hazards > Floods
Theme_Keyword: Earth Science > Coastal Processes > Sea Level Rise
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Categories
Theme_Keyword: oceans
Theme_Keyword: environment
Place:
Place_Keyword_Thesaurus: GCMD Location Keywords
Place_Keyword: Continent > North America > United States Of America > Hawaii
Place_Keyword:
Ocean > Pacific Ocean > Central Pacific Ocean > Hawaiian Islands > Maui
Place_Keyword:
Ocean > Pacific Ocean > Central Pacific Ocean > Hawaiian Islands > Oahu
Place_Keyword:
Ocean > Pacific Ocean > Central Pacific Ocean > Hawaiian Islands
Place_Keyword:
Ocean > Pacific Ocean > Central Pacific Ocean > Hawaiian Islands > Kauai
Access_Constraints: None
Use_Constraints:
Use Limitation: Based on the methodology of sea level rise modeling used in the Hawaii Sea Level Rise Vulnerability and Adaptation Report (Report) and the Hawaii Sea Level Rise Viewer (Viewer), having gone through peer review and publication in the Nature Journal Scientific Reports, the results of this study are sufficiently validated to be appropriately used in land management decisions as the best available information as of the date of publication of the Report, December 2017, consistent with the intent of Act 83 SLH 2014 as amended. This Report is intended to provide a state-wide assessment of Hawaii's vulnerability to sea level rise. The location of projected impacts and economic costs from damages are estimates based on a particular sea level rise scenario. The hazard and vulnerability data and maps provided herein are based on observational data and computer-based models as described in the Report and in published research (Anderson et al., 2018). As with all models, it is important to understand the methods, assumptions, limitations, and uncertainties of the methods used. The risks associated with use or non-use of the results are assumed by the user.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: University of Hawaii Coastal Geology Group (CGG)
Contact_Person: Charles Fletcher
Contact_Voice_Telephone: Unknown
Contact_Electronic_Mail_Address: fletcher@soest.hawaii.edu
Browse_Graphic:
Browse_Graphic_File_Name:
https://files.hawaii.gov/dbedt/op/gis/data/slr_cstl_erosn_2_pt_0_ft.png
Browse_Graphic_File_Description: Sample image.
Browse_Graphic_File_Type: PNG
Data_Set_Credit: SOEST, UH CGG, PacIOOS
Native_Data_Set_Environment: Version 6.2 (Build 9200) ; Esri ArcGIS 10.6.1.9270
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
Point_and_Vector_Object_Count: 336
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Map_Projection:
Map_Projection_Name: NAD 1983 HARN UTM Zone 4N
Transverse_Mercator:
Scale_Factor_at_Central_Meridian: 0.9996
Longitude_of_Central_Meridian: -159.0
Latitude_of_Projection_Origin: 0.0
False_Easting: 500000.0
False_Northing: 0.0
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.0001
Ordinate_Resolution: 0.0001
Planar_Distance_Units: meter
Geodetic_Model:
Horizontal_Datum_Name: D North American 1983 HARN
Ellipsoid_Name: GRS 1980
Semi-major_Axis: 6378137.0
Denominator_of_Flattening_Ratio: 298.257222101
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: slr_cstl_erosn_2_pt_0_ft
Attribute:
Attribute_Label: OBJECTID
Attribute_Definition: Internal feature number.
Attribute_Definition_Source: Esri
Attribute_Domain_Values:
Unrepresentable_Domain:
Sequential unique whole numbers that are automatically generated.
Attribute:
Attribute_Label: Shape
Attribute_Definition: Feature geometry.
Attribute_Definition_Source: Esri
Attribute_Domain_Values:
Unrepresentable_Domain: Coordinates defining the features.
Attribute:
Attribute_Label: id
Attribute:
Attribute_Label: Shape_Length
Attribute_Definition: Length of feature in internal units.
Attribute_Definition_Source: Esri
Attribute_Domain_Values:
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Attribute:
Attribute_Label: Shape_Area
Attribute_Definition: Area of feature in internal units squared.
Attribute_Definition_Source: Esri
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Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Pacific Islands Ocean Observing System (PacIOOS)
Contact_Voice_Telephone: Unknown
Contact_Electronic_Mail_Address: info@pacioos.org
Distribution_Liability: Unknown
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: Hawaii Sea Level Rise Viewer
Format_Information_Content: This URL provides a viewer for this dataset.
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: https://pacioos.org/shoreline/slr-hawaii/
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
https://climate.hawaii.gov/wp-content/uploads/2019/02/SLR-Report_Dec2017-with-updated-disclaimer.pdf
Fees: None specified
Metadata_Reference_Information:
Metadata_Date: 20201205
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: University of Hawaii Coastal Geology Group (CGG)
Contact_Person: Charles Fletcher
Contact_Address:
Address_Type: mailing and physical
Contact_Voice_Telephone: Unknown
Contact_Electronic_Mail_Address: fletcher@soest.hawaii.edu
Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
Generated by mp version 2.9.12 on Mon Dec 14 12:17:28 2020