TOPMODEL

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TOPMODEL

• Venkatesh Merwade

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Overview

• Little Background
• Some changes previous plans
• Data
• Methodology
• Results
• Conclusions

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Background

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

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Change in Plan

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

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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)

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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.
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Calibration Window
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Calibration Sensitivity Analysis
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Calibration Results
Not very good
Also not too bad!
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Effect Of Grid Size
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Effect of Slope
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Topographic Index Fun (TIF)
O
5
10
50
20
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TIF contd
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TIF contd
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TIF End
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Slapton Catchment (UK)
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Houston
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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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