1. General Model Information

Name: TOPOG

Acronym: TOPOG

Contact:

Author(s):

Abstract:

• describe the topographic attributes of complex three dimensional landscapes
• predict the spatial distribution of steady state waterlogging, erosion hazard and landslide risk indices
• simulate the transient hydrologic behaviour of catchments, and how this is affected by changing catchment vegetation
• model the growth of vegetation and how this impacts on the water balance
• model solute movement through the soil
• model sediment movement over the soil surface

TOPOG describes how water moves through landscapes; over the land surface, into the soil, through the soil and groundwater and back to the atmosphere via evaporation. Conservative solute movement and sediment transport are also simulated.
The primary strength of TOPOG is that it is based on a sophisticated digital terrain analysis model, which accurately describes the topographic attributes of three-dimensional landscapes. It is intended for application to small catchments (up to 10 km2, and generally smaller than 1 km2).
We refer to TOPOG as a "deterministic", "distributed-parameter" hydrologic modelling package. The term "deterministic" is used to emphasise the fact that the various water balance models within TOPOG use physical reasoning to explain how the hydrologic system behaves. The term "distributed-parameter" means that the model can account for spatial variability inherent in input parameters such as soil type, vegetation and climate.

II. Technical Information

II.1 Executables:

II.2 Source-code:

II.3 Manuals:

II.4 Data:

III. Mathematical Information

III.1 Mathematics

III.2 Quantities

III.2.1 Input

III.2.2 Output

IV. References

V. Further information in the World-Wide-Web

• TOPOG Online

VI. Additional remarks

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