1. Title, Journal and Authors

Title: Impact of DEM mesh size and soil map scale on SWAT runoff, sediment, and NO3–N loads predictions

Journal: Hydrology

Authors: V. Chaplot

 

2. Summary

This paper use Digital elevation model(DEM) (20m, 30m, 40m, 50m, 60m, 70m, 80m, 90m, 100m, 150m, 200m, 500m) and Soil map (scale 1/25,000, 1/250,000, 1/500,000) to compare each prediction accuracy.

In that site (Lower Walnut Creek), the DEM required an upper limit of 50 m. If the DEM exceeds 50m, it did not have a significant impact on the flow calculation, but errors were generated in predicting nitrogen and sediment. The Soil map needed detailed guidance for accurate prediction of sediment regardless of DEM.

Comparing mean differences, mean absolute differences, and root mean squared error values at that site, we found that using 60–90m DEM was better accuracy.

 

3. Originality and Creativity

 

 

4. Application to research

It should be considered that the results may vary from site to site. However, it is expected that it can be used as reference material. We will use data ranging from 50m to 80m.

 

5. Contact

Kyoungrim Ma/ M.S. program

 

Environmental Systems Engineering Lab.

School of Earth Sciences and Environmental Engineering

Gwangju Institute of Science and Technology

1 Oryong-dong Buk-gu Gwangju, 500-712, Korea

 

Phone : +82 10-5058-6832

E-mail : dkvmfhelxp34@gm.gist.ac.kr