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Maryland Shoreline Changes - Harford 30 Years Shoreline Erosion Level [Maryland]

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Title
Maryland Shoreline Changes - Harford 30 Years Shoreline Erosion Level [Maryland]
Description
To quantify shoreline rates of change (erosion or accretion), Maryland Geological Survey (MGS) used historical and recent shorelines spanning 1972-2007 as input into the Digital Shoreline Analysis System (DSAS) Version 4.3. DSAS, a computer program developed by the U.S. Geological Survey (USGS), determines linear rates of shoreline change along closely spaced, shore-normal transects. Based on DSAS output, MGS assigned generalized rate of change categories as attributes to a recent shoreline for Harford County. This recent shoreline consisted of the National Oceanic and Atmospheric Administration (NOAA) Continually Updated Shoreline Product (CUSP) digital shoreline currently available for Harford County. Based on the results of an End Point Rate (EPR) analysis on the ca. 1970s NOAA National Shoreline data sets and the ca. 2000 NOAA CUSP shoreline (recent shoreline), MGS grouped the rate results into the following general categories: (a) No change (-0.01 to 0.01 feet/year), (b) Accretion (greater than 0.01 feet/year), (c) Slight erosion rate (0 to -2 feet/year), (d) Low erosion rate (-2 to -4 feet/year), (e) Moderate erosion rate (-4 to -8 ft/yr), (f) High erosion rate (greater than -8 feet/year), (g) Protected, (h) No data (insufficient shorelines to calculate 30-year EPR rate), (i) No data (no transects cast; unprotected or unknown shoreline condition), and (j) Rates not delivered (calculated rates suspect). The CUSP shoreline represents the shoreline position in Harford County between the years 2005-2007. Negative rate of change values indicate erosion, and positive values indicate accretion. In general, MGS tried to attribute lengths of shoreline of at least 80 meters in length sharing similar rates of change.Funding for this data set was provided by Project CZM # 14-16-2146 CZM 136, funded by a National Oceanic and Atmospheric Administration (NOAA) grant (NA13NOS4190136) and made available to MGS through the Department of Natural Resources (MD DNR) Chesapeake and Coastal Service (CCS). MGS wishes to thank the following entities/individuals: 1) MD DNR CCS, Contact: Ms. Catherine McCall, Role: CCS Project Manager; 2) NOAA, Contact: Mr. Doug Graham, NOAA National Geodetic Survey, Role: Guidance on NOAA shoreline data sets; and 3) Ms. Lamere Hennesse, MGS Geologist, retired, Role: Project guidance & technical support.This is a MD iMAP hosted service. Find more information onhttps://imap.maryland.gov.Map Service Link:https://geodata.md.gov/imap/rest/services/Hydrology/MD_ShorelineChanges/MapServer/11
Creator
DNR
Temporal Coverage
Last modified 2019-08-27
Date Issued
2017-06-23
Rights
The Spatial Data, and the information therein, (collectively the "Data") is provided "as is" without warranty of any kind, either expressed, implied, or statutory. The user assumes the entire risk as to quality and performance of the Data. No guarantee of accuracy is granted, nor is any responsibility for reliance thereon assumed. In no event shall the State of Maryland be liable for direct, indirect, incidental, consequential or special damages of any kind. The State of Maryland does not accept liability for any damages or misrepresentation caused by inaccuracies in the Data or as a result to changes to the Data, nor is there responsibility assumed to maintain the Data in any manner or form. The Data can be freely distributed as long as the metadata entry is not modified or deleted. Any data derived from the Data must acknowledge the State of Maryland in the metadata.
Access Rights
Public
Format
Shapefile
Language
English
Date Added
March 08, 2023

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  • Citation
    DNR (2017). Maryland Shoreline Changes - Harford 30 Years Shoreline Erosion Level [Maryland]. . https://data.imap.maryland.gov/datasets/maryland::maryland-shoreline-changes-harford-30-years-shoreline-erosion-level (dataset)
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