GSTDTAP  > 资源环境科学
DOI10.1029/2019WR024873
MERIT Hydro: A High-Resolution Global Hydrography Map Based on Latest Topography Dataset
Yamazaki, Dai1,2; Ikeshima, Daiki2; Sosa, Jeison3; Bates, Paul D.3; Allen, George H.4; Pavelsky, Tamlin M.5
2019-06-01
发表期刊WATER RESOURCES RESEARCH
ISSN0043-1397
EISSN1944-7973
出版年2019
卷号55期号:6页码:5053-5073
文章类型Article
语种英语
国家Japan; England; USA
英文摘要

High-resolution raster hydrography maps are a fundamental data source for many geoscience applications. Here we introduce MERIT Hydro, a new global flow direction map at 3-arc sec resolution (similar to 90 m at the equator) derived from the latest elevation data (MERIT DEM) and water body data sets (G1WBM, Global Surface Water Occurrence, and OpenStreetMap). We developed a new algorithm to extract river networks near automatically by separating actual inland basins from dummy depressions caused by the errors in input elevation data. After a minimum amount of hand editing, the constructed hydrography map shows good agreement with existing quality-controlled river network data sets in terms of flow accumulation area and river basin shape. The location of river streamlines was realistically aligned with existing satellite-based global river channel data. Relative error in the drainage area was <0.05 for 90% of Global Runoff Data Center (GRDC) gauges, confirming the accuracy of the delineated global river networks. Discrepancies in flow accumulation area were found mostly in arid river basins containing depressions that are occasionally connected at high water levels and thus resulting in uncertain watershed boundaries. MERIT Hydro improves on existing global hydrography data sets in terms of spatial coverage (between N90 and S60) and representation of small streams, mainly due to increased availability of high-quality baseline geospatial data sets. The new flow direction and flow accumulation maps, along with accompanying supplementary layers on hydrologically adjusted elevation and channel width, will advance geoscience studies related to river hydrology at both global and local scales.


Plain Language Summary Rivers play important roles in global hydrological and biogeochemical cycles, and many socioeconomic activities also depend on water resources in river basins. Global-scale frontier studies of river networks and surface waters require that all rivers on the Earth are precisely mapped at high resolution, but until now, no such map has been produced. Here we present MERIT Hydro, the first high-resolution, global map of river networks developed by combining the latest global map of land surface elevation with the latest maps of water bodies that were built using satellites and open databases. Surface flow direction of each 3-arc sec pixel (similar to 90-m size at the equator) is mapped across the entire globe except Antarctica, and many supplemental maps (such as flow accumulation area, river width, and a vectorized river network) are generated. MERIT Hydro thus represents a major advance in our ability to represent the global river network and is a data set that is anticipated to enhance a wide range of geoscience applications including flood risk assessment, aquatic carbon emissions, and climate modeling.


英文关键词global hydrology hydrography river network topography
领域资源环境
收录类别SCI-E
WOS记录号WOS:000477616900031
WOS关键词DRAINAGE ; WATER ; RIVER ; MODEL
WOS类目Environmental Sciences ; Limnology ; Water Resources
WOS研究方向Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources
引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/183985
专题资源环境科学
作者单位1.Univ Tokyo, Inst Ind Sci, Tokyo, Japan;
2.Tokyo Inst Technol, Dept Civil & Environm Engn, Tokyo, Japan;
3.Univ Bristol, Sch Geog Sci, Bristol, Avon, England;
4.Texas A&M Univ, Dept Geog, College Stn, TX USA;
5.Univ N Carolina, Dept Geol Sci, Chapel Hill, NC 27515 USA
推荐引用方式
GB/T 7714
Yamazaki, Dai,Ikeshima, Daiki,Sosa, Jeison,et al. MERIT Hydro: A High-Resolution Global Hydrography Map Based on Latest Topography Dataset[J]. WATER RESOURCES RESEARCH,2019,55(6):5053-5073.
APA Yamazaki, Dai,Ikeshima, Daiki,Sosa, Jeison,Bates, Paul D.,Allen, George H.,&Pavelsky, Tamlin M..(2019).MERIT Hydro: A High-Resolution Global Hydrography Map Based on Latest Topography Dataset.WATER RESOURCES RESEARCH,55(6),5053-5073.
MLA Yamazaki, Dai,et al."MERIT Hydro: A High-Resolution Global Hydrography Map Based on Latest Topography Dataset".WATER RESOURCES RESEARCH 55.6(2019):5053-5073.
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