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Model Segmentation

Model Segmentation. General Rules. 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

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Model Segmentation

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  1. Model Segmentation General Rules

  2. 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

  3. Considerations for Segmentation

  4. 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

  5. Sampling Stations Rivers Sampling Station Water Intake Point & Nonpoint Sources Lakes & Reservoirs

  6. Map of Brandywine Study Area

  7. Segmentationof Brandywine River 10 11 1 • 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 2 3 Reaches: 4 12 5 6 7 8 9

  8. Middle Brandywine The Crescent (monitoring) Minhiriath Lake Evendim epilimnion Lake Evendim hypolimnion Shirebourne Marsh Brandywine WASP Network • Annuminas • Upper Plains • Hobbiton • Old Forest (monitoring) • South Downs • Tharbad Ferry

  9. Brandywine Physical Geometry

  10. Brandywine Simulation Control

  11. Brandywine Time Step

  12. Brandywine Print Interval

  13. Brandywine Network (1) • Open Segment tab • Press Insert to create a segment row

  14. Brandywine Network (2) • In the supporting spreadsheet: • Highlight river volumes • Copy to clipboard

  15. Brandywine Network (3) • Highlight Volume field • Paste clipboard • Nine segment rows will be opened with volumes

  16. 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.

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