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Watersheds may not recover from drought
Science ( IF 44.7 ) Pub Date : 2021-05-14 , DOI: 10.1126/science.abd5085
Tim J. Peterson 1, 2 , M. Saft 2 , M. C. Peel 2 , A. John 2
Affiliation  

The Millennium Drought (southeastern Australia) provided a natural experiment to challenge the assumption that watershed streamflow always recovers from drought. Seven years after the drought, the runoff (as a fraction of precipitation) had not recovered in 37% of watersheds, and the number of recovered watersheds was not increasing. When recovery did occur, it was not explained by watershed wetness. For those watersheds not recovered, ~80% showed no evidence of recovering soon, suggesting persistence within a low-runoff state. The post-drought precipitation not going to runoff was found to be likely going to increased evapotranspiration per unit of precipitation. These findings show that watersheds can have a finite resilience to disturbances and suggest that hydrological droughts can persist indefinitely after meteorological droughts.



中文翻译:

流域可能无法从干旱中恢复

千年干旱(澳大利亚东南部地区)提供了自然实验,以挑战流域水流总是从干旱中恢复的假设。干旱七年后,流域(占降水的一部分)没有恢复到37%的流域,恢复的流域数量也没有增加。当恢复确实发生时,分水岭的湿润并不能解释这一点。对于那些尚未恢复的流域,约80%的流域没有迹象表明很快会恢复,这表明低径流状态持续存在。发现干旱后的降水不会径流,这很可能会增加每单位降水量的蒸散量。这些发现表明,分水岭对干扰具有一定的抵抗力,表明水文干旱可以在气象干旱后无限期地持续下去。

更新日期:2021-05-14
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