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.