Model Segmentation General Rules. Watershed & Water Quality Modeling Technical Support Center Considerations for Segmentation Spatial scale of the problemSpatial.

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Presentation transcript:

Model Segmentation General Rules

Watershed & Water Quality Modeling Technical Support Center Considerations for Segmentation Spatial scale of the problemSpatial 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 segmentsDimensionality 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 componentsPhysical components –Water column (epilimnion, hypolimnion) –Benthic sediments (surface, subsurface) Model limitationsModel limitations –Maximum # of Segments 3000 –Maximum # of Time Pairs 4000

Watershed & Water Quality Modeling Technical Support Center Considerations for Segmentation

Watershed & Water Quality Modeling Technical Support Center Considerations for Segmentation Spatial PrecisionSpatial Precision –Model assumption: –Network scale determines how precisely the model will be able to reproduce observed gradients. Instant mixing throughout segment

Watershed & Water Quality Modeling Technical Support Center Sampling Stations Point & Nonpoint Sources Sampling Station Water Intake Rivers Lakes & Reservoirs

Watershed & Water Quality Modeling Technical Support Center Map of Brandywine Study Area

Watershed & Water Quality Modeling Technical Support Center Segmentation of Brandywine River Reaches: 1.Annuminas 2.Upper Plains 3.Hobbiton 4.Old Forest (monitoring) 5.South Downs 6.Tharbad Ferry 7.Middle Brandywine 8.The Crescent (monitoring) 9.Minhiriath 10.Lake Evendim epilimnion 11.Lake Evendim hypolimnion 12.Shirebourne Marsh

Watershed & Water Quality Modeling Technical Support Center Brandywine WASP Network 7.Middle Brandywine 8.The Crescent (monitoring) 9.Minhiriath 10.Lake Evendim epilimnion 11.Lake Evendim hypolimnion 12.Shirebourne Marsh 1.Annuminas 2.Upper Plains 3.Hobbiton 4.Old Forest (monitoring) 5.South Downs 6.Tharbad Ferry

Watershed & Water Quality Modeling Technical Support Center Brandywine Physical Geometry

Watershed & Water Quality Modeling Technical Support Center Brandywine Simulation Control

Watershed & Water Quality Modeling Technical Support Center Brandywine Time Step

Watershed & Water Quality Modeling Technical Support Center Brandywine Print Interval

Watershed & Water Quality Modeling Technical Support Center Brandywine Network (1) Open Segment tabOpen Segment tab Press Insert to create a segment rowPress Insert to create a segment row

Watershed & Water Quality Modeling Technical Support Center Brandywine Network (2) In the supporting spreadsheet:In the supporting spreadsheet: –Highlight river volumes –Copy to clipboard

Watershed & Water Quality Modeling Technical Support Center Brandywine Network (3) Highlight Volume fieldHighlight Volume field Paste clipboardPaste clipboard Nine segment rows will be opened with volumesNine segment rows will be opened with volumes

Watershed & Water Quality Modeling Technical Support Center Brandywine Network (4) Copy segment names from the spreadsheetCopy segment names from the spreadsheet Highlight first row.Highlight first row. Paste segment names in the Description field, and segment depths in the Depth Multiplier field.Paste segment names in the Description field, and segment depths in the Depth Multiplier field.