Global Estimates of River Flow Wave Travel Times and Implications for Low-Latency Satellite Data
Global Estimates of River Flow Wave Travel Times and Implications for Low-Latency Satellite Data
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DOI：
10.1029/2018gl077914
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发表时间：
2018-08-16
影响因子：
5.2
通讯作者：
Famiglietti, James S.
中科院分区：
文献类型：
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作者：
Allen, George H.;David, Cedric H.;Famiglietti, James S.
地球轨道卫星提供了对全世界上游河流状况的宝贵观测。这些观测结果可用于实时应用，如早期洪水预警系统和水库运营，前提是用户有足够的提前时间。然而，对于时间敏感的应用而言，获取基于卫星的河流数据的时间要求仍然不明确。在这里，我们提出了一个全球近似的流波旅行时间，以评估现有的和未来的低延迟/近实时卫星产品的效用，重点是即将到来的SWOT卫星使命。我们将运动波模型应用于全球水文数据集，发现以最大速度传播的全球水流波分别需要6天、4天和3天的中位传播时间才能到达其流域终点、下一个下游城市和下一个下游城市。下游水坝。我们的研究结果表明，最近提出的
Earth-orbiting satellites provide valuable observations of upstream river conditions worldwide. These observations can be used in real-time applications like early flood warning systems and reservoir operations, provided they are made available to users with sufficient lead time. Yet the temporal requirements for access to satellite-based river data remain uncharacterized for time-sensitive applications. Here we present a global approximation of flow wave travel time to assess the utility of existing and future low-latency/near-real-time satellite products, with an emphasis on the forthcoming SWOT satellite mission. We apply a kinematic wave model to a global hydrography data set and find that global flow waves traveling at their maximum speed take a median travel time of 6, 4, and 3 days to reach their basin terminus, the next downstream city, and the next downstream dam, respectively. Our findings suggest that a recently proposed