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Effects of Digital Elevation Model Resolution on Watershed-Based Hydrologic Simulation

Author

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  • Maryam Roostaee

    (Ardurra Group, Inc.)

  • Zhiqiang Deng

    (Louisiana State University)

Abstract

This paper investigated effects of Digital Elevation Model (DEM) resolution on flow simulation by applying the HSPF watershed model to three U.S. watersheds with different topographic conditions. Each watershed was delineated automatically and manually with four DEMs of the resolution ranging from 3.5 to 100 m. Results indicated that the simulated flow decreased with lowering DEM resolutions due to the reduction in the delineated drainage area particularly in low gradient watersheds. The DEM resolution impact was minimal when the manual method for watershed delineation was applied. The parameter uncertainty was found to be substantially greater than the resolution uncertainty in two out of three tested watersheds, indicating that the calibration of water balance parameters can alleviate the adverse effects of coarse DEM resolution for watersheds with high to moderate gradients. The findings are important to reducing the uncertainty, caused by DEM resolutions, in watershed modelling results, serving as guidelines for watershed modelling-based water resources management.

Suggested Citation

  • Maryam Roostaee & Zhiqiang Deng, 2020. "Effects of Digital Elevation Model Resolution on Watershed-Based Hydrologic Simulation," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 34(8), pages 2433-2447, June.
    • Handle: RePEc:spr:waterr:v:34:y:2020:i:8:d:10.1007_s11269-020-02561-0
    DOI: 10.1007/s11269-020-02561-0
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    Cited by:

    1. Shizhou Ma & Karen F. Beazley & Patrick Nussey & Christopher S. Greene, 2021. "Assessing Optimal Digital Elevation Model Selection for Active River Area Delineation Across Broad Regions," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 35(14), pages 4825-4840, November.
    2. Xue Chen & Guokun Chen & Junxin Feng & Jingjing Zhao & Yiwen Wang, 2023. "Slope Scaling Effect and Slope-Conversion-Atlas for Typical Water Erosion Regions in China," Sustainability, MDPI, vol. 15(4), pages 1-17, February.

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