Precipitation Changes in the Three Gorges Reservoir Area and the Relationship with Water Level Change.
Precipitation Changes in the Three Gorges Reservoir Area and the Relationship with Water Level Change.
复制标题
三峡库区降水变化及其与水位变化的关系。
DOI：
10.3390/s21186110
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发表时间：
2021-09-12
期刊：
影响因子：
--
通讯作者：
Shi M
中科院分区：
文献类型：
--
作者：
Li Q;Liu X;Zhong Y;Wang M;Shi M
三峡大坝作为世界上最大的水电工程，以往的研究表明，三峡大坝蓄水排水引起的水文循环变化对当地气候产生了影响。然而，以往的研究没有分析蓄水前后的长期降水变化，局地降水的变化特征仍然难以捉摸。本文利用1988年至2017年CN05.1降水资料集提取的降水异常资料，对三峡库区修建三峡库区前后(即1988-2002年和2003-2017年)的降水变化进行了跟踪分析。结果表明，三峡库区年、枯季降水异常呈增加趋势，汛期降水异常略有减少。三峡库区蓄水后，三峡库区降水集中程度降低，降水趋于均匀，降水集中时段增加不明显。2011年后，三峡库区月平均水位与降水异常出现共振现象，且呈正相关关系。我们的研究结果揭示了TGD蓄水前后当地降水特征的变化，并有力地证明了这种变化与水位的密切关系。
As the largest hydroelectric project worldwide, previous studies indicate that the Three Gorges Dam (TGD) affects the local climate because of the changes of hydrological cycle caused by the impounding and draining of the TGD. However, previous studies do not analyze the long-term precipitation changes before and after the impoundment, and the variation characteristics of local precipitation remain elusive. In this study, we use precipitation anomaly data derived from the CN05.1 precipitation dataset between 1988 and 2017 to trace the changes of precipitation before and after the construction of the TGD (i.e., 1988–2002 and 2003–2017), in the Three Gorges Reservoir Area (TGRA). Results showed that the annual and dry season precipitation anomaly in the TGRA presented an increasing trend, and the precipitation anomaly showed a slight decrease during the flood season. After the impoundment of TGD, the precipitation concentration degree in the TGRA decreased, indicating that the precipitation became increasingly uniform, and the precipitation concentration period insignificantly increased. A resonance phenomenon between the monthly average water level and precipitation anomaly occurred in the TGRA after 2011 and showed a positive correlation. Our findings revealed the change of local precipitation characteristics before and after the impoundment of TGD and showed strong evidence that this change had a close relationship with the water level.
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