Model Segmentation

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Model Segmentation

• General Rules

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Considerations for Segmentation

• Spatial scale of the problem
• Segment of a water body (e.g., reach, embayment)
• Whole water body (e.g., main river, lake,
  estuary)
• Whole river basin network
• Dimensionality and spatial discretization of
  segments
• Box, 1-, 2-, 3-dimensions
• Horizontal tens of meters to tens of kilometers
• Vertical whole water column to tens of
  centimeters
• Physical components
• Water column (epilimnion, hypolimnion)
• Benthic sediments (surface, subsurface)
• Model limitations
• Maximum of Segments 3000
• Maximum of Time Pairs 4000

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Considerations for Segmentation
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Considerations for Segmentation

• Spatial Precision
• Model assumption
• Network scale determines how precisely the model
  will be able to reproduce observed gradients.

Instant mixing throughout segment
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Sampling Stations
Rivers
Sampling Station Water Intake
Point Nonpoint Sources
Lakes Reservoirs
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Map of Brandywine Study Area
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Segmentationof Brandywine River
10 11
1
2
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Reaches
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• Annuminas
• Upper Plains
• Hobbiton
• Old Forest (monitoring)
• South Downs
• Tharbad Ferry
• Middle Brandywine
• The Crescent (monitoring)
• Minhiriath
• Lake Evendim epilimnion
• Lake Evendim hypolimnion
• Shirebourne Marsh

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5
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Brandywine WASP Network

• Annuminas
• Upper Plains
• Hobbiton
• Old Forest (monitoring)
• South Downs
• Tharbad Ferry

• Middle Brandywine
• The Crescent (monitoring)
• Minhiriath
• Lake Evendim epilimnion
• Lake Evendim hypolimnion
• Shirebourne Marsh

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Brandywine Physical Geometry
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Brandywine Simulation Control
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Brandywine Time Step
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Brandywine Print Interval
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Brandywine Network (1)

• Open Segment tab
• Press Insert to create a segment row

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Brandywine Network (2)

• In the supporting spreadsheet
• Highlight river volumes
• Copy to clipboard

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Brandywine Network (3)

• Highlight Volume field
• Paste clipboard
• Nine segment rows will be opened with volumes

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Brandywine Network (4)

• Copy segment names from the spreadsheet
• Highlight first row.
• Paste segment names in the Description field, and
  segment depths in the Depth Multiplier field.