Analysis of Relative Water Level Variations in Hong Kong, China from 1962 to 2017

LIU Ju; BAO Jingyang; XU Jun; ZHOU Wei

doi:10.13203/j.whugis20180325

Volume 45 Issue 7

Jul. 2020

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Geomatics and Information Science of Wuhan University > 2020 > 45(7): 1065-1072. > DOI: 10.13203/j.whugis20180325

LIU Ju, BAO Jingyang, XU Jun, ZHOU Wei. Analysis of Relative Water Level Variations in Hong Kong, China from 1962 to 2017[J]. Geomatics and Information Science of Wuhan University, 2020, 45(7): 1065-1072. DOI: 10.13203/j.whugis20180325

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Analysis of Relative Water Level Variations in Hong Kong, China from 1962 to 2017

1.
Operational Software and Simulation Research Institute, Dalian Naval Academy, Dalian 116018, China
2.
School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China
3.
Departmentof Hydrography and Cartography, Dalian Naval Academy, Dalian 116018, China
4.
91550 Troops, Dalian 116023, China

Funds:

The National Natural Science Foundation of China 41074002

The National Natural Science Foundation of China 41501500

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Author Bio:
LIU Ju, PhD candidate, specializes in the theory and applications of water level control in hydrographic survey and marine en-vironmeat simulation. E-mail: liuju9752@163.com
Received Date: May 29, 2019
Published Date: July 29, 2020

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Abstract

Abstract

Utilizing the data of water level, observed by tide gauges in Hong Kong, China from 1962? 2017, the variation of sea level, tidal harmonic constants and other character values of water level in the sea area are determined and analyzed in this paper. The results show that the average changing rate of mean sea level is 1.06mm/a, however, both the trend and scale of each tide gauge's mean sea level changing rate are different. For example, the rate of Chi Ma Wan is (-3.85 ± 0.61) mm/a, while the rate of Waglan Island is (4.12 ± 0.76) mm/a and the the rate of Tsim Bei Tsui is (0.32 ± 0.32) mm/a. From 1962 to 2017, S_a and S_sa of Quarry Bay, calculated annually, have poor stability, and the changing trends of harmonic constants of shallow water constituents are obvious relatively. Diurnal and semidiurnal constituents are nearly stable, but in 2004―2008 the amplitudes of M₂, O₁ and K₁ vary from other years. The level of lowest normal low water and lowest astronomical tide increase in the rate of 0.18 mm/a and 0.27 mm/a respectively.
- sea level change,
- harmonic constants,
- chart datum,
- relative change of water level,
- tidal gauges of Hong Kong

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References

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