Response of hydrodynamics in tidal reach of the Yangtze River to variation in runoff

ZHANG Zhi-wei; JIANG Chen-juan; LI Shan-shan

doi:10.3969/j.issn.1001-909X.2017.01.003

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Journal of Marine Sciences ›› 2017, Vol. 35 ›› Issue (1) : 25-32. DOI: 10.3969/j.issn.1001-909X.2017.01.003

Response of hydrodynamics in tidal reach of the Yangtze River to variation in runoff

ZHANG Zhi-wei, JIANG Chen-juan^*, LI Shan-shan

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Abstract

The operation of Three Gorges Reservoir causes the variation of runoff in the middle and lower reaches of the Yangtze River, inevitably resulting in the changes in tidal dynamics. Based on the data of river discharge and tidal level in recent 20 years, the response of hydrodynamics in tidal reach of the Yangtze River to variation in runoff was investigated by statistical analysis and tidal harmonic analysis. The results show that the operation of Three Gorges Reservoir causes the significant change in interannual distribution of runoff, with river discharge increase by more than 20% percent in discharging period and decease during storage period. Besides, in river reach between Datong and Jiangyin, the tidal level with guarantee ratio of 10%~70% is significantly decreased, but the tidal level with guarantee ratio of 80%~100% is slightly increased. Furthermore, the tidal range and amplitude of M₂ tidal constitute is decreased during discharging period, indicating a decrease in tidal dynamics, while the tidal range and amplitude of M₂ tidal constitute is increased during storage period, indicating a increase in tidal dynamics.

Key words

Three Gorges Reservoir / tidal reach of the Yangtze River / river dynamics / tidal dynamics / variation in runoff

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ZHANG Zhi-wei, JIANG Chen-juan, LI Shan-shan. Response of hydrodynamics in tidal reach of the Yangtze River to variation in runoff[J]. Journal of Marine Sciences. 2017, 35(1): 25-32 https://doi.org/10.3969/j.issn.1001-909X.2017.01.003

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