CEE 6440 GIS in WATER RESOURCES

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Hydrology Rainfall - Runoff Modeling (I)

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Presentation transcript:

CEE 6440 GIS in WATER RESOURCES Program to Generate Stream Network Width Function By Anurag Nayak

Channel Network Width Function x x The number of channels at a distance x from the outlet Source: http://www.engineering.usu.edu/cee/faculty/dtarb/hydrogis/italy4.ppt

Use of width function in hydrology: Width function based instantaneous unit hydrograph generation RIGON et al.:Getting the Rescaled Width Function and the Derived WGIUH To model the response of stream network.

CALCULATION OF NETWORK RESPONSE FUNCTION FROM NWF NRF is calculated from the NWF and a routing function using velocity (A m/s) and diffusion (D m2/s) coefficients Routing Function (parameters A and D) LINKS RESPONSE = * DISTANCE TIME NWF NRF http://www.geog.ucl.ac.uk/~plewis/b1002/hydro/RSandHYDROLOGY.ppt#12 University college London, Department of Geomatic Engineering

CALCULATION OF PREDICTED RIVER FLOWS Hydrological model used to produce ‘generated runoff’ from precipitation, where ‘generated runoff’ is that portion of precipitation which enters the channel network * FLOW = RESPONSE RUNOFF TIME TIME TIME PREDICTED FLOW NRF RUNOFF

Stream Network of Logan River

Input Files: 1: Link Number 2: Start Point Number 3: End Point Number 4: DSLink Number 5&6: USLink Number 7: Order of Link 8: Monitoring Point Identifier 1: X Coordinate 2: Y Coordinate 3: Distance along channels to DS Termial link 4: Elevation 5: Contributing Area

Programming Logic Read input files tree.dat and coord.dat. Calculate the stream length of each link. Calculate downstream distance to the outlet. DSLength(Link) = Length(DSLink)+ DSLength(DSLink) Width Function at any distance x is defined as the number of links for which DSLength(Link) < x < DSLength(Link) + Length(Link)

Generated Width Function for Logan River

Stream Network of Bear River

Generated Width Function for Bear River WaterShed

Future Possibilities Can be added as a tool in TauDEM to analyze stream network response.

QUESTIONS