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TOPMODEL

TOPMODEL. Venkatesh Merwade. Overview. Little Background Some changes previous plans Data Methodology Results Conclusions. Background. Development Physically Based Model Important Components Soil Water Balance Topographic Index. Change in Plan. Size of the catchment

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TOPMODEL

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  1. TOPMODEL Venkatesh Merwade

  2. Overview • Little Background • Some changes previous plans • Data • Methodology • Results • Conclusions

  3. Background • Development • Physically Based Model • Important Components • Soil Water Balance • Topographic Index

  4. Change in Plan • Size of the catchment • 325 miles2 to 3 Km2 !! • DTM Analysis • Objective • Calibration • Effect of Grid Size • Change in Slope

  5. Data • Discharge (on the web) • Rainfall (on the web) • DEM (Victoria Samuels) • Potential Evapotranspiration (?) • Temperature (max,min,average) • Penman Monteith (??) • Empirical (Hargreaves, 4.2.44 & 4.4.4)

  6. Methodology • Run DTM and TOPMODEL and get myself familiar. • Errors • Calibration with original data. • Have fun with different grid size. • Have fun with different slopes. one, two, three.

  7. Calibration Window

  8. Calibration Sensitivity Analysis

  9. Calibration Results Not very good Also not too bad!

  10. Effect Of Grid Size

  11. Effect of Slope

  12. Topographic Index Fun (TIF) O 5 10 50 20

  13. TIF cont’d

  14. TIF cont’d

  15. TIF End

  16. Slapton Catchment (UK)

  17. Houston

  18. Conclusions • Easy to calibrate (need to be careful with the text files). • Insensitive to two parameters (SRint and Chvel). • Grid size has some effect but not very significant. • Slope has very little effect on the overall performance of the model. • The show will continue……….

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