Layer: Post-Dorian Outwash Features (ID:0)

View In: Map Viewer

Name: Post-Dorian Outwash Features

Display Field: Shape_Leng

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: Along North Core Banks, from Old Drum Inlet in the south to the Portsmouth Flats in the north, there were about 86 distinct outwash channels that breached the dune during Hurricane Dorian. We examined these channels individually to determine their shape and volume. Sand loss was calculated from the SfM maps by subtracting the post-Dorian DEM from the pre-Dorian DEM to create a difference map. For each channel, the perimeter (P), area (A), length (L), width (W), and throat width (T) were measured in a GIS program. We also calculated the average depth (D avg ) of the channels. Those depths, multiplied by the areas, were used to calculate the volume of sediment behind the dune lost by each channel during Hurricane Dorian. The maximum and average depths across the throat (D t-max and D t-avg ) were also extracted to estimate the velocity of the water flowing through the channel during the hurricane.

Copyright Text: U.S. Geological Survey, Woods Hole Coastal and Marine Science Center

Min. Scale: 0

Max. Scale: 0

Default Visibility: true

Max Record Count: 2000

Supported query Formats: JSON, geoJSON, PBF

Use Standardized Queries: True

Extent:

Drawing Info:

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HasZ: false

HasM: false

Has Attachments: false

Has Geometry Properties: true

HTML Popup Type: esriServerHTMLPopupTypeAsHTMLText

Object ID Field: FID

Unique ID Field:

Global ID Field:

Type ID Field:

Fields:

FID (type: esriFieldTypeOID, alias: FID, SQL Type: sqlTypeOther, length: 0, nullable: false, editable: false)
Shape_Leng (type: esriFieldTypeDouble, alias: Perimeter (m), SQL Type: sqlTypeOther, nullable: true, editable: true)
Volume (type: esriFieldTypeInteger, alias: Volume (m3), SQL Type: sqlTypeOther, nullable: true, editable: true)
Length (type: esriFieldTypeInteger, alias: Length (m), SQL Type: sqlTypeOther, nullable: true, editable: true)
Width (type: esriFieldTypeInteger, alias: Width (m), SQL Type: sqlTypeOther, nullable: true, editable: true)
Throat (type: esriFieldTypeInteger, alias: Throat Width (m), SQL Type: sqlTypeOther, nullable: true, editable: true)
thr_de_avg (type: esriFieldTypeSingle, alias: Throat Depth (avg. m), SQL Type: sqlTypeOther, nullable: true, editable: true)
Shape__Area (type: esriFieldTypeDouble, alias: Shape__Area, SQL Type: sqlTypeDouble, nullable: true, editable: false)
Shape__Length (type: esriFieldTypeDouble, alias: Shape__Length, SQL Type: sqlTypeDouble, nullable: true, editable: false)
Area (type: esriFieldTypeInteger, alias: Area (m2), SQL Type: sqlTypeOther, nullable: true, editable: true)

Templates:

Is Data Versioned: false

Has Contingent Values: false

Supports Rollback On Failure Parameter: true

Last Edit Date: 7/27/2023 6:19:27 PM

Schema Last Edit Date: 3/1/2023 5:54:33 PM

Data Last Edit Date: 3/1/2023 6:01:58 PM

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