The variation characteristics and causes analysis of salt tide intrusion in the Changjiang River Estuary

Li Wenshan; Wang Hui; Zuo Changsheng; Dong Junxing; Xu Hao; Pan Song; Jin Bowen; Gao Tong

doi:10.3969/j.issn.0253-4193.2020.07.003

Volume 42 Issue 7

Nov. 2020

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Li Wenshan，Wang Hui，Zuo Changsheng, et al. The variation characteristics and causes analysis of salt tide intrusion in the Changjiang River Estuary[J]. Haiyang Xuebao，2020, 42(7)：32–40 doi: 10.3969/j.issn.0253-4193.2020.07.003

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The variation characteristics and causes analysis of salt tide intrusion in the Changjiang River Estuary

doi: 10.3969/j.issn.0253-4193.2020.07.003

National Marine Data and Information Service, Tianjin 300171, China

Received Date: 2019-06-02
Rev Recd Date: 2019-08-08

Available Online: 2020-11-18

Publish Date: 2020-07-25

Abstract

Abstract

Based on tide gauge observation data, sea level change impact investigation information and runoff observation data, the changing characteristics and causes of salt tide intrusions at Changjiang River Estuary during 2009−2018 were emphatically analyzed. Results show that: (1) Seasonal variations of salt tide intrusions at Changjiang River Estuary are obvious, which usually begin from September to October, and end in April or May of the following year. The most frequent occurrence is in March, reaching 12 times. The occurrence and duration of salt tide intrusions marked downward trend as a whole during 2009−2018. The intrusion occurrence was the most in 2009, reaching 13 times, all appeared during October to April of the following year. Annual variation of salt tide intrusion duration was obvious, which was the longest in 2011, reaching 55 days. The occurrence and duration of salt tide intrusions all decreased obviously during 2015−2018, and there was no salt tide intrusion in 2018. (2) From January to April, the seasonal sea level is low, and runoff is small in the Changjiang River Estuary. As influenced by the East-Asian Monsoon, the surge-runoff impact index is high, valued 1.5, 1.9 and 1.6 for January, February and March respectively during 2009−2018. Salt tide intrusion is mainly influenced by surge during this period. For the time of May to July, the runoff increases significantly and becomes dominant, and the sea-level-runoff impact indexes are less than zero. In August, the runoff of the Changjiang River begins to decrease. Seasonal sea level is high, but there is continuous negative surge during this time. Correspondingly, the sea level-runoff impact index is 0.1, and the surge-runoff impact index is −1.6. And salt tide intrusion hardly happens. In September, the seasonal sea level is high, and surge is obvious. The sea level-runoff as well as surge-runoff impact indexes is 1.2 and 1.0 respectively, and salt tide intrusion is very likely to happen. For the time of October and November, the sea-level-runoff impact indexes are 1.5 and 0.8 respectively, and the Changjiang River Estuary is prone to salt tide intrusions. (3) Two-thirds of the 48 salt tide intrusions in the past 10 years occurred in the period of astronomical high tide. The basic sea level is high in some years in the Changjiang River Estuary. In the cases of continuous surge and astronomical high tide, the impacts of the saltwater intrusion will be aggravated.
- sea level,
- runoff,
- astronomical high tide,
- storm surge,
- salt tide

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References(34)

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