The Role of Intensifying Precipitation on Coastal River Flooding and Compound River-Storm Surge Events, Northeast Gulf of Mexico.
The Role of Intensifying Precipitation on Coastal River Flooding and Compound River-Storm Surge Events, Northeast Gulf of Mexico.
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DOI：
10.1029/2020wr029363
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发表时间：
2021-11
影响因子：
5.4
通讯作者：
Dzwonkowski, B.
中科院分区：
文献类型：
--
作者：
Dykstra, S. L.;Dzwonkowski, B.
破坏性的沿海洪水通常越来越频繁，可能是全球降水加剧造成的。通过气候，流域和河流过程的这种联系知之甚少，因为在过渡的河流-海洋环境中，洪水是由河流，海洋风暴潮，或两者在复合事件中引起的复杂的相互作用。为了更好地了解河流洪水沿着河流-海洋过渡，我们研究了墨西哥湾东北部的流域使用长期观测。结果表明，降水增强减少了降水-排放滞后时间，增加了河流洪水频率和河流-海洋过渡中复合事件的可能性。滞后时间的减少发生在大西洋多年代际振荡和厄尔尼诺南方涛动开始通过湿空气的平流强烈影响河流流量，加强降水。沿着河流-海洋过渡带，内陆河段的复合事件最多。然而，对于内陆河段，复合事件水位没有超过仅由河流洪水造成的洪水，这是这些系统中最大的洪水危害。我们的研究结果表明，降水和河流流量在沿海洪水中起着至关重要的作用，随着气候继续变暖和降水加剧，洪水可能会加剧。长期观测表明，气候引起的降水增强缩短了降水和沿海排放之间的时间，ENSO排放相关性产生了正和负的ENSO排放相关性，这些相关性以60年为周期缓慢振荡。
Destructive coastal floods are commonly increasing in frequency and may be caused by global precipitation intensification. Such connections through climate, watershed, and river processes are poorly understood because of complex interactions in transitional fluvial‐marine environments where flooding is caused by rivers, marine storm surge, or both in compound events. To better understand river floods along the fluvial‐marine transition, we study watersheds of the northeastern Gulf of Mexico using long‐term observations. Results show intensifying precipitation decreased precipitation‐discharge lag times, increasing river‐flood frequency and the likelihood of compound events in fluvial‐marine transitions. This reduction in lag time occurred when the Atlantic Multidecadal Oscillation and El Niño Southern Oscillation began strongly affecting river discharge through the advection of moist air, intensifying precipitation. Along the fluvial‐marine transition, compound events were largest in inland reaches. However, for inland reaches, compound event water levels did not exceed the floods caused solely by river flooding, the largest flood hazard in these systems. Our results demonstrate precipitation and river discharge play critical roles in coastal flooding and will likely escalate flooding as the climate continues to warm and intensify precipitation. Long‐term observations show a climate induced precipitation intensification shortened the time between precipitation and coastal discharge Teleconnections produced positive and negative ENSO‐discharge correlations, which oscillated slowly at a 60‐year period Results from the Gulf of Mexico watersheds suggest global warming is increasing the frequency of compound river‐marine flooding