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首页> 外文期刊>Australian journal of water resources >The relative efficiency of water supply catchments and rainwater tanks in cities subject to variable climate and the potential for climate change
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The relative efficiency of water supply catchments and rainwater tanks in cities subject to variable climate and the potential for climate change

机译：气候变化和气候变化潜能的城市供水集水区和雨水箱的相对效率

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This study has analysed the relative efficiencies of runoff into dams supplying Brisbane, Melbourne, Perth and Sydney, and of rainwater harvesting in those cities. It is shown that both respond differently to drought and climate change forcing, with decentralised rainwater harvesting systems in cities exhibiting a more uniform performance across these stressors. The impact of natural variations in climate is considerable, with the inland catchments that supply cities exhibiting a disproportionate decrease in yield in response to rainfall reductions, as compared to rainwater tanks in the cities. A 50% decrease in median rainfall at each location results in a 60% to 85% reduction in runoff to dams and a 15% to 30% reduction in yield from 3 kL rainwater tanks. Rainwater yields from 3 kL tanks in the cities were more resilient to the potential for climate change than runoff into dams supplying the cities. Reductions in runoff from the worst case climate change scenario ranged from 19% to 53%, while reductions in yields from rainwater tanks were 5% to 8%. Yields from rainwater tanks in cities were also more resilient to droughts than runoff into dams. This study highlights the potential for rainwater tanks in cities to supplement water supply from dams during droughts and to buffer the expected impacts of climate change.
机译：这项研究分析了流入布里斯班，墨尔本，珀斯和悉尼的大坝的径流以及这些城市收集雨水的相对效率。结果表明，两者对干旱和气候变化强迫的反应不同，城市中分散的雨水收集系统在这些压力源上表现出更加统一的表现。气候自然变化的影响是巨大的，与城市中的雨水储罐相比，内陆流域的补给城市由于降雨减少而单产下降得不成比例。每个位置的降雨中位数减少50％，导致大坝的径流减少60％至85％，而3 kL雨水箱的产量减少15％至30％。与流入城市的水坝的径流相比，城市中3 kL储水池的雨水对气候变化的潜力更具抵抗力。在最坏的情况下，气候变化情景下的径流减少幅度在19％至53％之间，而雨水箱的产量减少幅度在5％至8％之间。城市的雨水储罐的收益对干旱的抵抗力也要比大坝的径流高。这项研究强调了城市雨水罐在干旱期间补充大坝供水并缓冲气候变化预期影响的潜力。

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