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Impact of the Three Gorges Dam Overruled by an Extreme Climate Hazard

机译：极端气候危害推翻了三峡大坝的影响

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摘要

While it is generally difficult to separate the impact of extreme climate events on river catchment conditions from that of human activities, there are unique data available to document this for the catchment area of the Yangtze in the years that the Three Gorges Dam (TGD) started to have an impact. During the second impoundment phase in 2006, the suspended sediment discharge (SSD) and water stored behind the TGD was 23 × 10~6 t and 11 × 10~9 m~3, respectively, which is only 18% of the total SSD reduction and about 1% of the water discharge (901 × 10~9 m~3) in 2005 at Datong. The total SSD and water discharge into the Yangtze Estuary in 2006 was 60 and 24% less than those in 2005, respectively. It can be quantified that the contribution of the extreme climate (drought) on discharge and SSD reduction was 95 and 82% of the total in 2006, respectively. In addition, it was found that the periods of high salinity (>250 and 400 mg/L) at Haimen that happened during the second impoundment phase accounted for 25 and 23% of the total occurrences in 2006, respectively. This analysis shows that the impact of extreme climate conditions can overrule the human interference, even for the largest dam, the TGD.
机译：尽管通常很难将极端气候事件对河流集水条件的影响与人类活动的影响区分开，但在三峡大坝（TGD）启动的年份中，有大量数据可用于记录长江集水区的情况。产生影响。在2006年的第二个蓄水阶段，悬浮沉积物排放（SSD）和TGD后面存储的水分别为23×10〜6 t和11×10〜9 m〜3，仅占SSD减少总量的18％ 2005年大同市的排水量（901×10〜9 m〜3）约占1％。 2006年，长江口的SSD总量和排水量分别比2005年减少60％和24％。可以量化的是，2006年极端气候（干旱）对排放量和SSD减少的贡献分别为95％和82％。此外，还发现第二个蓄水阶段海门高盐度时期（> 250和400 mg / L）分别占2006年总发生率的25％和23％。该分析表明，即使对于最大的三峡大坝（TGD），极端气候条件的影响也可以推翻人为干扰。

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