Development of the Global Width Database for Large Rivers
Development of the Global Width Database for Large Rivers
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DOI：
10.1002/2013wr014664
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发表时间：
2014-04
影响因子：
5.4
通讯作者：
Dai Yamazaki;F. O'Loughlin;M. Trigg;Z. Miller;T. Pavelsky;P. Bates
中科院分区：
文献类型：
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作者：
Dai Yamazaki;F. O'Loughlin;M. Trigg;Z. Miller;T. Pavelsky;P. Bates
河流宽度是河流水动力模拟的一个基本参数，但目前尚未建立基于观测水体的全球尺度河流宽度数据库。在这里，我们提出了一种新的算法，可以自动计算基于卫星的水掩模和流向图的河流宽度。将该算法应用于SRTM水体数据库和流域流向图，开发了全球大河宽度数据库（GWD‐LR）。两岸之间的河流宽度和不包括岛屿的有效河流宽度都计算在60S和60N之间的河道。GWD‐LR的有效河流宽度与刚果河和密西西比河现有的河流宽度数据库进行了比较。与现有数据库相比，GWD‐LR的有效河流宽度略窄，但大多数河道的相对差异在±20%以内。由于GWD‐LR的河流宽度是沿着水文流域流向图的河道计算的，因此将GWD‐LR应用于全球和大陆尺度的河流建模相对简单。
River width is a fundamental parameter of river hydrodynamic simulations, but no global‐scale river width database based on observed water bodies has yet been developed. Here we present a new algorithm that automatically calculates river width from satellite‐based water masks and flow direction maps. The Global Width Database for Large Rivers (GWD‐LR) is developed by applying the algorithm to the SRTM Water Body Database and the HydroSHEDS flow direction map. Both bank‐to‐bank river width and effective river width excluding islands are calculated for river channels between 60S and 60N. The effective river width of GWD‐LR is compared with existing river width databases for the Congo and Mississippi Rivers. The effective river width of the GWD‐LR is slightly narrower compared to the existing databases, but the relative difference is within ±20% for most river channels. As the river width of the GWD‐LR is calculated along the river channels of the HydroSHEDS flow direction map, it is relatively straightforward to apply the GWD‐LR to global and continental‐scale river modeling.