NCSU GIS/MEA582:
Geospatial Modeling and Analysis

7. Flow modeling

7.A Flow routing, watershed analysis

Outline:
  • cumulative terrain parameters based on flow tracing: definitions and general approach (flow path length, flow accumulation, stream networks, watershed boundaries, ridge lines)
  • methods for computing flow direction (D8, Dinf), flow tracing (SFD, MFD, uniform, weighted)
  • methods for flow tracing through depressions and flat areas (filling, carving, hybrid, least cost path)
  • principle of stream extraction from a DEM and watershed delineation

Lecture

Lecture slides: Flow routing and watershed analysis

Supplemental materials:

Assignment A

7.B Hydrologic and Erosion modeling

Outline:
  • geospatial aspects of models: spatially averaged and distributed models
  • spatial hydrologic modeling
  • spatial modeling of erosion and sediment transport
  • deriving input parameters, analysis and visualization of modeling results
  • modeling impact of landuse change

Lecture

Lecture slides: Hydrologic and Erosion Modeling,

Supplemental materials:

Assignment B:

Homework 7 A and B:

Prepare a paper where you compare different methods for flowrouting and watershed analysis, compute flooded area, and explain and discuss impact of model parameters and land use scenarios on spatial pattern and magnitude of erosion as simulated by simple GIS-based models.