期刊
HYDROLOGICAL SCIENCES JOURNAL-JOURNAL DES SCIENCES HYDROLOGIQUES
卷 56, 期 7, 页码 1280-1288出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/02626667.2011.585136
关键词
suspended sediment discharge (SSD); Yangtze (Changjiang) Estuary; China; Three Gorges Dam (TGD); extreme drought
资金
- National Science Key Foundation in China [50939003]
- National Great Science Project of China [2010CB951202]
- Programme Strategic Scientific Alliances between China and The Netherlands [2008DFB90240]
- National Science Foundation in China [41076050]
In 2006, the suspended sediment discharge (SSD) into the Yangtze (Changjiang) Estuary, China, reached the historical low value of 85 x 10(6) t. One hypothesis is that this was caused by the second impoundment, i.e. the second stage of the water-level increase behind the Three Gorges Dam (TGD). However, coincidentally, a significant drought occurred in the same year. From our analysis of long-term data on discharge and SSD, we conclude that the SSD decrease in the upstream catchment area resulting from the extreme drought is primarily responsible for the historical low SSD into the Yangtze Estuary. We quantified the contributions of the extreme drought and the second impoundment to the reduction of SSD into the Yangtze Estuary in 2006 as 82% and 18%, respectively. Even though the TGD is the largest dam in the world, the results indicate that the extreme drought conditions had a greater impact than such a manmade river regulation.
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