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CEE 795 Water Resources Modeling and GIS

CEE 795 Water Resources Modeling and GIS. Lecture 6: Flow Networks in GIS (ArcHydro) (some material from Dr. David Maidment, University of Texas, Dr. David Tarboton, Utah State University, and Dr. Franciso Olivera) February 22, 2006. Learning Objectives: Describe a Network model

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CEE 795 Water Resources Modeling and GIS

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  1. CEE 795Water Resources Modeling and GIS Lecture 6: Flow Networks in GIS (ArcHydro) (some material from Dr. David Maidment, University of Texas, Dr. David Tarboton, Utah State University, and Dr. Franciso Olivera) February 22, 2006 Learning Objectives: • Describe a Network model • Identify Flow in a network model • Develop a hydrologic network • Perform linear referencing on networks Assignments: Exercise #5 Handouts:

  2. Hydro Networks in GIS • Network model • Flow on Networks • Hydrologic networks • Linear referencing on networks Some slides in this presentation were prepared by Dr Francisco Olivera

  3. National Hydrography Dataset Key feature classes Five feature classes with NHDFLowline built into A geometric network NHDPoint, NHDLine, NHDArea are point, line and area water features on map apart from flowlines and waterbodies

  4. National Hydrography Dataset

  5. NHD Waterbody

  6. NHD Geometric Network

  7. Arc Hydro Framework Input Data Watersheds Waterbody Streams Hydro Points

  8. Arc Hydro Framework Data Model

  9. Arc Hydro Framework For South Florida Basins Waterbody (NHD) Hydro Points Hydro Network (NHD)

  10. Network Definition • A network is a set of edges and junctions that are topologically connected to each other.

  11. Network Model in GIS • Three components • Geometric model: (x,y,z,m) coordinates of edges and junctions • Logical model: which edges are connected to what junctions • Addressing model: location on the network using measure

  12. Edges and Junctions • Simple feature classes: points and lines • Network feature classes: junctions and edges • Edges can be • Simple: one attribute record for a single edge • Complex: one attribute record for several edges in a linear sequence • A single edge cannot be branched No!!

  13. Polylines and Edges

  14. Junctions • Junctions exist at all points where edges join • If necessary they are added during network building (generic junctions) • Junctions can be placed on the interior of an edge e.g. stream gage • Any number of point feature classes can be built into junctions on a single network

  15. Connectivity Table p. 132 of Modeling our World J125 Junction Adjacent Junction and Edge E2 J124 E3 E1 J123 J126 This is the “Logical Network”

  16. Build Network Tables • Establishes connectivity of Edge and Junction features • Enables tracing • Generates Generic Junctions Geometric Network Wizard in ArcCatalog

  17. Snapping Features

  18. Network Sources and Sinks Each junction feature class in a network can have junctions which are sources or sinks for flow

  19. Flow to a sink

  20. Flags

  21. Trace Solvers

  22. Upstream Trace Solvers

  23. Flow Line Traces movement of water in a one-dimensional flow system

  24. Location of the Flowline

  25. Introduction to the Hydro Network • Hydro Edge – think of Arc • HydroJunction – think of Node • Waterbody – think of Polygon

  26. Edge Junction Flow Network A connected set of flow edges

  27. Hydro Network for Holland

  28. Guadalupe Basin Framework Dataset

  29. Network Tracing on the Guadalupe Basin

  30. Schematic Network

  31. Connecting Waterbodies using Relationships

  32. Hydro Network through Canyon Lake

  33. Linking Canyon Lake to the Network

  34. Connecting Drainage Areas using Relationships

  35. Connecting Drainage Areas to the Network Area goes to point on line

  36. Linear Referencing Where are we on a line?

  37. My Streams are really long… Use ReachID to link many Hydro Edges together into one River

  38. Addressing

  39. Coordinates of a 2-D Polyline

  40. Coordinates of a 2-D Polyline M

  41. Setting Line Measure

  42. Proportional Aliasing Distance is measured Relative to the length of the line as a percentage 0% – 100%

  43. Setting Percent Measure pMSeg.SetAndInterpolate MsBetween 0, 100 pMSeg.SetAndInterpolate MsBetween 100, 0 0 – 100 going downstream 0 – 100 going upstream

  44. Distances from Upper End in Meters

  45. 0% Percent distance from bottom end of reach 100%

  46. Measure in kilometers Measure in km from bottom end of line (like river miles or Kilometers) pMSeg.SetAndInterpolateMsBetween 0, ([Shape_Length] /1000)

  47. Point and Line Events

  48. Displaying Events

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