Assessment of horizontal shifting errors in open-source DEMs and their impact on 1D hydraulic modeling of meandering river channel

IF 5 2区地球科学 Q1 WATER RESOURCES

Journal of Hydrology-Regional Studies Pub Date : 2025-08-16 DOI:10.1016/j.ejrh.2025.102707

Md. Ismail Firoz , Md. Latifur Rahman Sarker , Janet Nichol , Eko Siswanto

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引用次数: 0

Abstract

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.

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开源dem水平偏移误差评价及其对曲流河道一维水力模拟的影响

研究区域——孟加拉恒河——研究焦点开放获取gdem中的水平偏移误差在检测和评估其对水力建模的影响方面受到的关注很少。通过对比DEM河流中心线和实时河流中心线、测量河道动态和分析水位高程剖面，采用3种综合技术检测ASTER和SRTM DEM的水平偏移误差。研究人员采用了四种策略来评估影响：评估dem生成的河道，创建用于洪水测绘的一维水力模型，评估洪水准确性，以及可视化水平变化。研究结果揭示了几个重要问题。首先，两种dem均存在显著的水平偏移误差，最大、平均和最小误差分别为3200 m、1800 m和680 m，但误差强度存在时空差异。其次,最大河床效力(≥73.38 %)在2000年被观察到,但随后下降到≤41.25  %,≤ 47.94 %≤46.75  %,和≤54.08  % 2006年,2010年,2015年和2020年,分别。③水平位移误差严重影响了一维淹没制图精度。最后，河道动态与DEM河道有效性呈显著负相关（r ≥ -0.963）。结果表明，这两种dem都存在水平偏移误差，这将在水力和洪水模拟中产生严重的不准确结果，特别是在动态地形地区。

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来源期刊

Journal of Hydrology-Regional Studies Earth and Planetary Sciences-Earth and Planetary Sciences (miscellaneous)

CiteScore

6.70

自引率

8.50%

发文量

284

审稿时长

60 days

期刊介绍： Journal of Hydrology: Regional Studies publishes original research papers enhancing the science of hydrology and aiming at region-specific problems, past and future conditions, analysis, review and solutions. The journal particularly welcomes research papers that deliver new insights into region-specific hydrological processes and responses to changing conditions, as well as contributions that incorporate interdisciplinarity and translational science.