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Maryland Shoreline Inventory: Shoreline Structures 2020
2020-06-11T00:00:00
Comprehensive Coastal Inventory, Center for Coastal Resources Management
Virginia Insitute of Marine Science (VIMS)
1375 Greate Road, P.O. Box 1346
Gloucester Point
Virginia
23062
US
1
-76.711937
-75.819543
39.221246
38.219885
Ground condition at time of imagery
To inventory Maryland's tidal shoreline conditions.
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN /></P><P><SPAN>The shoreline inventory files have been generated to support the application of the Living Shoreline Suitability Model (LSSM), developed by the Center for Coastal Resources Management (CCRM), Virginia Institute of Marine Science (VIMS), to enhance and streamline regulatory decision making in Maryland. This shoreline inventory includes the features needed as inputs to run the LSSM. </SPAN></P><P><SPAN>The data developed for the Shoreline Inventory is based on a three-tiered shoreline assessment approach. This assessment characterizes conditions by using observations made remotely at the desktop using high resolution imagery (MD Six Inch Imagery 2016/2017) . The three-tiered shoreline assessment approach divides the shorezone into three regions: 1) the immediate riparian zone, evaluated for land use; 2) the bank, evaluated for height, and natural protection (i.e., marshes and beaches); and 3) the shoreline, describing the presence of shoreline structures for shore protection and recreational purposes.</SPAN></P></DIV></DIV></DIV>
Shoreline Condition
Shoreline Structures
Riparian
Shoreline Inventory
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>These data should not be used for jurisdictional permit determinations beyond providing general shoreline condition or status information. These data have not been surveyed to property boundaries.</SPAN></P><P><SPAN /></P><P><SPAN>The Center for Coastal Resources Management (CCRM) at VIMS performs a service by distributing data generated by either CCRM or public agencies, which offer data without restriction or charge. CCCRM assumes no responsibility for data accuracy or precision, metadata completeness or correctness for digital information. CCRM assumes no liability for misuse of any data which may arise as a result of any alteration, conversion, or combination with other data sources. As well, the timeliness and scale of these products must be considered when evaluating appropriate use. </SPAN></P><P><SPAN /></P><P><SPAN>The contents of this dataset do not necessarily reflect the views and policies of the Environmental Protection Agency, nor does the EPA endorse trade names or recommend the use of commercial products mentioned in this document. </SPAN></P><P><SPAN /></P></DIV></DIV></DIV>
Land use. Land cover, Shoreline conditions, Shoreline structures, Hardened structures, Accesss structures, Riparian land use, Shoreline inventory
Choptank River, La Trappe Creek, Island Creek, Tred Avon River, Miles River, Tuckahoe Creek, Wye River, Little Choptank River, Chesapeake Bay, Anne Arundel County, Calvert County, Dorchester County, Talbot County
This project has been funded wholly or in part by the United States Environmental Protection Agency under assistance agreement CD-963623-01-1 to the Maryland Department of the Environment.
Karinna Nunez
Comprehensive Coastal Inventory, Center for Coastal Resources Management, Virginia Insitute of Marine Science (VIMS)
GIS Analyst
1375 Greate Road, P.O. Box 1346
Virginia
23062
karinna@vims.edu
US
804-684-7273
There are three shapefiles associated with the Maryland shoreline inventory database: MD_lubc (land use and bank cover), MD_astru (access points), and MD_sstru (shoreline structures). MD_lubc is a linear shapefile containing data about land use, tree fringe, bank height, bank cover, and spit along the shoreline. MD_astru is a point shapefile with locations of docks, dilapidated docks, boathouses, and private and public boat ramps. MD_sstru is a linear shapefile delineating hard structures in place at the shoreline (bulkhead, dilapidated bulkhead, riprap, wharf, unconventional, debris, marina < 50 slips, marina > 50 slips, jetty, marsh toe revetment, groinfield and breakwaters).
File Geodatabase Feature Class
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Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
Shape
Shape
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0
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Feature geometry.
Esri
Coordinates defining the features.
Structure
Structure
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0
0
Erosion control conditions at the shoreline: breakwater, bulkhead, dilapidated bulkhead, debris, groinfield, jetty, marina >50 slips, marina <50 slips, marsh toe revetment, riprap, unconventional, and wharf.
Glossary of Shoreline Features Defined, Center for Coastal Resources Management, VIMS
Bulkhead
Bulkheads, traditionally, are treated wood or steel “walls” constructed to offer protection from wave attack. More recently, plastics are being used in construction. Bulkheads are vertical structures built slightly seaward of the problem area and backfilled with suitable fill material. They function like a retaining wall, as they are designed to retain upland soil and prevent erosion of the bank from impinging waves.
Glossary of Shoreline Features Defined, Center for Coastal Resources Management, VIMS
Dilapidated Bulkhead
A bulkhead which has failed due to deterioration from age or storm damage is called a dilapidated bulkhead. In many cases the structure may not be able to perform erosion control functions any longer.
Glossary of Shoreline Features Defined, Center for Coastal Resources Management, VIMS
Breakwater
Breakwaters are structures that sit offshore and generally occur in a parallel series along the shore. Some breakwaters are attached to the land, referred to as headland breakwaters. Their purpose is to attenuate and deflect incoming wave energy, protecting the fastland behind and between the structures.
Glossary of Shoreline Features Defined, Center for Coastal Resources Management, VIMS
Debris
Debris represents nonconforming materials and rubble dumped along the shoreline in a haphazard manner. Debris can include tires, bricks, broken concrete rubble, and railroad ties. The inventory maps Unconventional instead of Debris when the material is deliberately placed for shoreline protection in a manner similar to riprap, bulkhead, and other shoreline protection structures.
Glossary of Shoreline Features Defined, Center for Coastal Resources Management, VIMS
Groinfield
Groins are low profile structures that sit perpendicular to the shore. They can be constructed of rock, timber, or concrete. They are frequently set in a series known as a groinfield, which may extend along a stretch of shoreline for some distance. Unless only a single groin can be detected, this inventory does not delineate individual groins in a groinfield. The groinfield is mapped as one linear feature parallel to the shoreline running along the length of the groin series. When effective, groins will trap sediment moving alongshore.
Glossary of Shoreline Features Defined, Center for Coastal Resources Management, VIMS
Jetty
A jetty is a structure, generally constructed of stone, which is perpendicular to the shoreline and generally located at the entrance of tidal creeks, tributaries, and marina boat basins. The function of a jetty is to prevent sediment transported alongshore from accumulating in the inlet.
Glossary of Shoreline Features Defined, Center for Coastal Resources Management, VIMS
Marinas: < 50 slips and > 50 slips
Marinas are denoted as line features in this survey. The infrastructure associated with the marina (e.g. bulkheading, docks, wharfs, etc) are not digitized individually; however, if a boat ramp is present, it will be surveyed separately and coded as a private ramp. Marinas are generally commercial operations; however, smaller scale community docks offering slips and launches for residences are becoming more popular. To distinguish these facilities from commercial marinas, the user could check the riparian land use delineation. If “residential”, the marina is most likely a community facility. The survey estimates the number of slips within the marina and classifies marinas as those with less than 50 slips and those with more than 50 slips
Glossary of Shoreline Features Defined, Center for Coastal Resources Management, VIMS
Marsh Toe Revetment
aka Marsh sill) – A low revetment placed offshore from an existing marsh or new planted marsh is classified as marsh toe revetment. The structure may include tidal openings to allow for the easy exchange of free swimming organisms during tidal cycles. Marsh toe revetments are mapped as offshore linear features running along the length of the structure. Marsh toe revetments are distinguished from breakwaters by the linear placement and presence of a tidal marsh instead of a sand beach landward from the structure. The classification can include best professional judgment.
Glossary of Shoreline Features Defined, Center for Coastal Resources Management, VIMS
Riprap
aka Revetments) - Sloped structures constructed with large, heavy stone or other materials placed against the upland bank for erosion protection. Riprap is mapped as a linear feature along the shoreline. Riprap is also used next to failing bulkheads (bulkhead toe revetments). The inventory maps only riprap when this type of structure is co-located with bulkheads. A similar structure is used to protect the edge of eroding marshes, which is mapped as marsh toe revetment, not riprap.
Glossary of Shoreline Features Defined, Center for Coastal Resources Management, VIMS
Unconventional
Unconventional features represent segments along the shore where alternative material has been deliberately placed for shoreline protection. Unconventional features may include unique materials placed in a similar manner as riprap or bulkheads, such as engineered pre-cast concrete products. It may also include unique placement or arrangement of conventional materials like riprap that does not fit other structure definitions. The inventory maps "debris" instead of "unconventional" when the material is haphazardly scattered and not providing any shoreline protection.
Glossary of Shoreline Features Defined, Center for Coastal Resources Management, VIMS
Wharf
A wharf is typically described a shore parallel structure where boats are tied. In this inventory, wharfs are generally associated with large industrial, public or commercial facilities.
Glossary of Shoreline Features Defined, Center for Coastal Resources Management, VIMS
Inventory
Inventory
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200
0
0
County
County
String
50
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Structures
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50
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Imagery
Imagery
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220
0
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Year
Year_Created
SmallInteger
2
0
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miles
miles_utm18
Double
8
0
0
Shape_Length
Shape_Length
Double
8
0
0
Length of feature in internal units.
Esri
Positive real numbers that are automatically generated.
SPStructures
Shoreline_Protection_Structures
String
255
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Jessica Hendricks
Comprehensive Coastal Inventory, Center for Coastal Resources Management, Virginia Insitute of Marine Science (VIMS)
Scientist
1375 Greate Road, P.O. Box 1346
Gloucester Point
Virginia
23062
US
804-684-7140
The shoreline used to create the shapefiles for Maryland is the dataset created in conjunction with the Chesapeake Bay Critical Area remapping project) This shoreline was published in 2016.
2016-10-12T00:00:00
All processing steps for the shoreline inventory were generated using ArcGIS - ArcMap v10.6.1 while viewing conditions observed on MD_SixInchImagery and Google Earth Pro (checking dates from 1994 to 2018). For the land use/bank cover shapefile, arcs were split and coded for land use, bank height, bank cover, tree fringe, and presence or absence of spit , marsh and beach. For the access structure shapefile, points were placed where structures (dock, dilapidated dock, boathouse, public ramp, and private ramp) are located on the shoreline. For the shoreline structure shapefile, arcs were coded for bulkhead, delapidated bulkhead, riprap, unconventional, debris, wharf, breakwater, groinfield, jetty, marsh toe revetment, and marina >50 slips and <50 slips.
2019-08-19T00:00:00
QAQC was done by a different Scientist and the entire shoreline was reviewed.
2020-01-31T00:00:00
As the Shoreline Inventory for a Maryland locality is completed, it is added to this composite feature layer. This Shoreline Inventory represents data processed beginning in 2020.
2021-06-01T00:00:00