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Effect of DEM sources on distributed hydrological model to results of runoff and inundation area


Physically based distributed hydrologic modeling, rainfall-runoff-inundation (RRI) model is used to evaluate runoff uncertainty on different topography data using five DEM products such as ASTER GDEM, SRTM, GMTED2010, HydroSHEDS, and GTOPO30. The five DEM products are input to the RRI model for the case study on the Nan River basin (13,000 km2 of the watershed area) in Thailand. The performance of the DEM products, on runoff and inundation area, was evaluated from storm event in 2011 using statistical and detection analysis, compared with observation data. Overall of the DEM products evaluated with both analyses, the SRTM performed the best to compare with average observed data. For the simulated runoff of GMTED2010 firstly closed to the observed runoff to provide the highest correlation and smallest Root Mean Square Error values. The inundation resulted from SRTM was the highest accuracy to compare with the RADARSAT-2 product from GISTDA Thailand. The study presents that uncertainty of DEM produced from satellite and their potential a sensor and system developers to create better products for improving runoff and improved flood analysis for disaster mitigation approach.

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Source: Sayama et al. (2012)

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Source: Pakoksung and Takagi (2016)

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The study cannot be conducted without the data provided from various agencies, e.g., the Royal Irrigation Department, Land Development Department, and GISTDA Thailand, etc. Kochi University of Technology has been supported in part with Takagi laboratory.

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Correspondence to Kwanchai Pakoksung.

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Pakoksung, K., Takagi, M. Effect of DEM sources on distributed hydrological model to results of runoff and inundation area. Model. Earth Syst. Environ. 7, 1891–1905 (2021).

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  • DEM
  • DEM sources
  • Runoff
  • Rainfall-runoff-inundation model