Characterizing the capability of public DEMs for mapping global floodplain bathymetry

IF 5.9 1区地球科学 Q1 ENGINEERING, CIVIL

Journal of Hydrology Pub Date : 2025-03-28 DOI:10.1016/j.jhydrol.2025.133205

Yaling Lin , Chenyu Fan , Kai Liu , Lingyang Liu , Xinyuan Deng , Pengju Xu , Pengfei Zhan , Xuefei Fu , Chunqiao Song

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引用次数: 0

Abstract

Digital elevation models (DEMs) play a significant role in floodplain management, including water inundation boundary delineation, flood modeling and forecasting, and risk assessment. The impact of spatio-temporal resolution and vertical accuracy of DEMs on flood modeling has been widely concerned in previous studies. However, due to variations in data acquisition season and geographical coverage of each DEM, it still remains unclear how much variation exists in the extent of exposed topography provided by different DEMs over the global floodplains. Furthermore, how to select and jointly use the various DEM data sources for achieving the maximum level of exposed topography coverage also requires to be further explored. This study selected three DEMs (SRTM DEM, ASTER DEM, and FABDEM) to evaluate their capability of offering the topographic exposure extent within global floodplains by proposing the topographic exposure index (TEI). The results show that the global average TEI is highest for SRTM DEM, followed by ASTER DEM, while FABDEM has the lowest average TEI. The difference in TEI distribution between FABDEM and the other two DEMs is the most significant. Moreover, the TEI of these three DEMs has remarkably inconsistent performances in spatial sub-zones. In regions such as southern China, central India, and Brazil, the TEI of SRTM DEM and ASTER DEM is significantly higher compared to FABDEM, largely influenced by human activities such as dam-induced reservoir water impoundment areas and aquacultures. In contrast, FABDEM shows significantly higher TEI than the other two DEMs in Canada and central Siberia, as well as in regions with saline lakes (e.g., the Great Salt Lake, Lake Razzaza), predominantly influenced by climatic and hydrologic features. The joint use of these three DEM datasets with appropriate fusing strategy may expand the exposed topographic area of global floodplains, at an equivalent magnitude of the Nile floodplain area (2.67 × 10⁵ km²).

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来源期刊

Journal of Hydrology 地学-地球科学综合

CiteScore

11.00

自引率

12.50%

发文量

1309

审稿时长

7.5 months

期刊介绍： The Journal of Hydrology publishes original research papers and comprehensive reviews in all the subfields of the hydrological sciences including water based management and policy issues that impact on economics and society. These comprise, but are not limited to the physical, chemical, biogeochemical, stochastic and systems aspects of surface and groundwater hydrology, hydrometeorology and hydrogeology. Relevant topics incorporating the insights and methodologies of disciplines such as climatology, water resource systems, hydraulics, agrohydrology, geomorphology, soil science, instrumentation and remote sensing, civil and environmental engineering are included. Social science perspectives on hydrological problems such as resource and ecological economics, environmental sociology, psychology and behavioural science, management and policy analysis are also invited. Multi-and interdisciplinary analyses of hydrological problems are within scope. The science published in the Journal of Hydrology is relevant to catchment scales rather than exclusively to a local scale or site.