model segmentation geographical

7/29/2019 Model Segmentation Geographical

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Model SegmentationModel Segmentation

General RulesGeneral Rules


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Watershed & Water Quality Modeling Technical Support CenterWatershed & Water Quality Modeling Technical Support Center

Considerations for SegmentationConsiderations 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


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Considerations forConsiderations for

SegmentationSegmentation


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Considerations forConsiderations for

SegmentationSegmentation Spatial PrecisionSpatial Precision

Model assumption:

Network scaledetermines howprecisely the modelwill be able toreproduce observedgradients.

Instant

mixing throughout

segment


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Sampling StationsSampling Stations

Point & NonpointPoint & Nonpoint

SourcesSources

Sampling StationSampling StationWater IntakeWater Intake

RiversRivers

Lakes & ReservoirsLakes & Reservoirs


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Map ofMap of

BrandywineBrandywineStudy AreaStudy Area


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SegmentationSegmentation

of Brandywine Riverof Brandywine River

3

1

4

2

5

8

7

6

12

10

11

9

Reaches:

1.1. AnnuminasAnnuminas

2.2. Upper PlainsUpper Plains3.3. HobbitonHobbiton

4.4. Old Forest (monitoring)Old Forest (monitoring)

5.5. South DownsSouth Downs

6.6. Tharbad FerryTharbad Ferry

7.7. Middle BrandywineMiddle Brandywine8.8. The Crescent (monitoring)The Crescent (monitoring)

9.9. MinhiriathMinhiriath

10.10. Lake Evendim epilimnionLake Evendim epilimnion

11.11. Lake Evendim hypolimnionLake Evendim hypolimnion

12.12. Shirebourne MarshShirebourne Marsh


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Brandywine WASP NetworkBrandywine WASP Network

7.7. Middle BrandywineMiddle Brandywine

8.8. The Crescent (monitoring)The Crescent (monitoring)

9.9. MinhiriathMinhiriath10.10. Lake Evendim epilimnionLake Evendim epilimnion

11.11. Lake Evendim hypolimnionLake Evendim hypolimnion

12.12. Shirebourne MarshShirebourne Marsh

1.1. AnnuminasAnnuminas

2.2. Upper PlainsUpper Plains

3.3. HobbitonHobbiton4.4. Old Forest (monitoring)Old Forest (monitoring)

5.5. South DownsSouth Downs

6.6. Tharbad FerryTharbad Ferry


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Brandywine Physical GeometryBrandywine Physical Geometry


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Brandywine Simulation ControlBrandywine Simulation Control


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Brandywine Time StepBrandywine Time Step


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Brandywine Print IntervalBrandywine Print Interval

h d li d li h i lW h d & W Q li M d li T h i l S C


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Brandywine Network (1)Brandywine Network (1)

OpenOpen

Segment tabSegment tab Press InsertPress Insert

to create ato create a

segment rowsegment row

W h d & W Q li M d li T h i l S CW t h d & W t Q lit M d li T h i l S t C t


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In the supporting spreadsheet:In the supporting spreadsheet: Highlight river volumes

Copy to clipboard

W t h d & W t Q lit M d li T h i l S t C tW t h d & W t Q lit M d li T h i l S t C t


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HighlightHighlight

Volume fieldVolume field

PastePaste

clipboardclipboard

NineNine

segmentsegment

rows will berows will beopened withopened with

volumesvolumes

W t h d & W t Q lit M d li T h i l S t C tW t h d & W t Q lit M d li T h i l S t C t


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Copy segmentCopy segment

names fromnames from

thethe

spreadsheetspreadsheet

Highlight firstHighlight first

row.row.

Paste segmentPaste segment

names in thenames in the

DescriptionDescription

field, andfield, and

segmentsegment

depths in thedepths in the

DepthDepth

Multiplier field.Multiplier field.

model segmentation geographical

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