Assessment of horizontal shifting errors in open-source DEMs and their impact on 1D hydraulic modeling of meandering river channel
Study Region: The Ganges River, Bangladesh Study Focus: Horizontal shifting error in open-access GDEMs has received very little attention for detecting and assessing its impact on hydraulic modeling. This study uses three integrated techniques to detect horizontal shifting errors in ASTER and SRTM D...
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Elsevier
2025-10-01
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| Series: | Journal of Hydrology: Regional Studies |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214581825005361 |
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| author | Md. Ismail Firoz Md. Latifur Rahman Sarker Janet Nichol Eko Siswanto |
| author_facet | Md. Ismail Firoz Md. Latifur Rahman Sarker Janet Nichol Eko Siswanto |
| author_sort | Md. Ismail Firoz |
| collection | DOAJ |
| description | Study Region: The Ganges River, Bangladesh Study Focus: Horizontal shifting error in open-access GDEMs has received very little attention for detecting and assessing its impact on hydraulic modeling. This study uses three integrated techniques to detect horizontal shifting errors in ASTER and SRTM DEMs by comparing DEM river centerlines and real-time river centerlines, measuring river channel dynamics, and analyzing water level elevation profiles. Four strategies were applied to assess the impacts: evaluating DEM-generated river channels, creating a 1D hydraulic model for inundation mapping, assessing inundation accuracy, and visualizing the horizontal shifts. New Hydrological Insights for the Region: The results reveal several significant issues. Firstly, both DEMs exhibited notable horizontal shifting errors, with observed maximum, average, and minimum errors of 3200 m, 1800 m, and 680 m, respectively, though the intensity of these errors varied spatiotemporally. Secondly, the maximum riverbed effectiveness (≥73.38 %) was observed in 2000, but subsequently decreased to ≤ 41.25 %, ≤ 47.94 %, ≤ 46.75 %, and ≤ 54.08 % in 2006, 2010, 2015, and 2020, respectively. Thirdly, the horizontal shifting error was found to have severe implications for 1D inundation mapping accuracy. Lastly, strong negative correlation was observed between river channel dynamics and DEM river channel effectiveness (r ≥ -0.963). The results indicate that both DEMs have horizontal shifting errors, which are expected to produce severe inaccurate results in hydraulic and flood modeling, especially in areas with dynamic topography. |
| format | Article |
| id | doaj-art-a729298990a84b7cbef641dfdcd11e41 |
| institution | Kabale University |
| issn | 2214-5818 |
| language | English |
| publishDate | 2025-10-01 |
| publisher | Elsevier |
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| series | Journal of Hydrology: Regional Studies |
| spelling | doaj-art-a729298990a84b7cbef641dfdcd11e412025-08-20T04:02:51ZengElsevierJournal of Hydrology: Regional Studies2214-58182025-10-016110270710.1016/j.ejrh.2025.102707Assessment of horizontal shifting errors in open-source DEMs and their impact on 1D hydraulic modeling of meandering river channelMd. Ismail Firoz0Md. Latifur Rahman Sarker1Janet Nichol2Eko Siswanto3Department of Geography and Environmental Studies, University of Rajshahi, Rajshahi 6205, BangladeshDepartment of Geography and Environmental Studies, University of Rajshahi, Rajshahi 6205, Bangladesh; Corresponding author.School of the Environment and Life Sciences, University of Portsmouth, PO12UP, UKEarth Surface System Research Center, Japan Agency for Marine-Earth Science and Technology, Yokohama, JapanStudy Region: The Ganges River, Bangladesh Study Focus: Horizontal shifting error in open-access GDEMs has received very little attention for detecting and assessing its impact on hydraulic modeling. This study uses three integrated techniques to detect horizontal shifting errors in ASTER and SRTM DEMs by comparing DEM river centerlines and real-time river centerlines, measuring river channel dynamics, and analyzing water level elevation profiles. Four strategies were applied to assess the impacts: evaluating DEM-generated river channels, creating a 1D hydraulic model for inundation mapping, assessing inundation accuracy, and visualizing the horizontal shifts. New Hydrological Insights for the Region: The results reveal several significant issues. Firstly, both DEMs exhibited notable horizontal shifting errors, with observed maximum, average, and minimum errors of 3200 m, 1800 m, and 680 m, respectively, though the intensity of these errors varied spatiotemporally. Secondly, the maximum riverbed effectiveness (≥73.38 %) was observed in 2000, but subsequently decreased to ≤ 41.25 %, ≤ 47.94 %, ≤ 46.75 %, and ≤ 54.08 % in 2006, 2010, 2015, and 2020, respectively. Thirdly, the horizontal shifting error was found to have severe implications for 1D inundation mapping accuracy. Lastly, strong negative correlation was observed between river channel dynamics and DEM river channel effectiveness (r ≥ -0.963). The results indicate that both DEMs have horizontal shifting errors, which are expected to produce severe inaccurate results in hydraulic and flood modeling, especially in areas with dynamic topography.http://www.sciencedirect.com/science/article/pii/S2214581825005361Open-source DEMHorizontal shifting error1D hydraulic modelImpact assessmentRiver channel dynamics1D inundation mapping error |
| spellingShingle | Md. Ismail Firoz Md. Latifur Rahman Sarker Janet Nichol Eko Siswanto Assessment of horizontal shifting errors in open-source DEMs and their impact on 1D hydraulic modeling of meandering river channel Journal of Hydrology: Regional Studies Open-source DEM Horizontal shifting error 1D hydraulic model Impact assessment River channel dynamics 1D inundation mapping error |
| title | Assessment of horizontal shifting errors in open-source DEMs and their impact on 1D hydraulic modeling of meandering river channel |
| title_full | Assessment of horizontal shifting errors in open-source DEMs and their impact on 1D hydraulic modeling of meandering river channel |
| title_fullStr | Assessment of horizontal shifting errors in open-source DEMs and their impact on 1D hydraulic modeling of meandering river channel |
| title_full_unstemmed | Assessment of horizontal shifting errors in open-source DEMs and their impact on 1D hydraulic modeling of meandering river channel |
| title_short | Assessment of horizontal shifting errors in open-source DEMs and their impact on 1D hydraulic modeling of meandering river channel |
| title_sort | assessment of horizontal shifting errors in open source dems and their impact on 1d hydraulic modeling of meandering river channel |
| topic | Open-source DEM Horizontal shifting error 1D hydraulic model Impact assessment River channel dynamics 1D inundation mapping error |
| url | http://www.sciencedirect.com/science/article/pii/S2214581825005361 |
| work_keys_str_mv | AT mdismailfiroz assessmentofhorizontalshiftingerrorsinopensourcedemsandtheirimpacton1dhydraulicmodelingofmeanderingriverchannel AT mdlatifurrahmansarker assessmentofhorizontalshiftingerrorsinopensourcedemsandtheirimpacton1dhydraulicmodelingofmeanderingriverchannel AT janetnichol assessmentofhorizontalshiftingerrorsinopensourcedemsandtheirimpacton1dhydraulicmodelingofmeanderingriverchannel AT ekosiswanto assessmentofhorizontalshiftingerrorsinopensourcedemsandtheirimpacton1dhydraulicmodelingofmeanderingriverchannel |