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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >The Chennai Water Crisis: Insufficient rainwater or suboptimal harnessing of runoff?
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The Chennai Water Crisis: Insufficient rainwater or suboptimal harnessing of runoff?

机译：钦奈水危机：雨水不足或径流的径流？

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摘要

Chennai experienced acute water shortage during 2019 summer, and four years prior, an early-winter deluge. Analysis of 116 years (1901-2016) of rainfall in Chennai Sub-basin shows a weak climate change signal: Winter monsoon rainfall, has slightly increased, especially in December. The much larger Cauvery basin to the south also exhibits a nondescript climate change signal in winter rainfall. Late summer (September) rainfall in the Cauvery Basin has, however, precipitously declined in recent years (1987-2016). We show that this decline, as well as the mid-20th century increase, are attributable to natural multidecadal climate variability (Atlantic Multidecadal Oscillation) - cautioning against cavalier attributions of recent-period trends and the Chennai Water Crisis to climate change. Analysis of runoff - the rainwater leftover after its hydrologic and atmospheric processing - shows that harnessing even half of the winter monsoon runoff in the Chennai Sub-basin can satiate the city's water demand for about seven months; and without needing new reservoir facilities. The present analysis suggests that Chennai's water woes arise not from insufficient rainwater, but from the suboptimal harnessing of related runoff.
机译：2019年夏天，金奈经历了严重的缺水，四年前，一场初冬的洪水。对钦奈子流域116年（1901-2016）的降雨分析显示，气候变化信号较弱：冬季季风降雨略有增加，尤其是在12月。南部更大的Cauvery盆地在冬季降雨中也显示出一种难以描述的气候变化信号。然而，近几年（1987-2016），考维盆地的夏末（9月）降雨量急剧下降。我们表明，这种下降，以及20世纪中期的增长，可归因于自然的几十年气候变化（大西洋几十年振荡）——提醒不要轻率地将近期趋势和钦奈水危机归因于气候变化。径流分析（经过水文和大气处理后留下的雨水）表明，利用钦奈子流域冬季季风径流的一半，就可以满足该市约七个月的用水需求；而且不需要新的水库设施。目前的分析表明，钦奈的水资源问题不是因为雨水不足，而是因为对相关径流的不当利用。

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