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Tide- and wind-driven variability of water level in Sansha Bay, Fujian, China |
Hongyang LIN2, Jianyu HU1, Jia ZHU1(), Peng CHENG1, Zhaozhang CHEN1, Zhenyu SUN1, Dewen CHEN3 |
1. State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China 2. College of the Environment and Ecology, Xiamen University, Xiamen 361102, China 3. Marine Forecast Station of Xiamen, State Oceanic Administration, Xiamen 361012, China |
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Abstract This study analyzes water-level variability in Sansha Bay and its adjacent waters near Fujian, China, using water-level data observed from seven stations along the coast and wind data observed from a moored buoy near Mazu Island. At super- to near-inertial frequencies, tides dominated the water-level variations, mainly characterized by semi-diurnal (primarily M2, S2, and N2) and diurnal tides (primarily K1, O1). The correlation coefficients between residual (non-tidal) water-level time series and the observed wind-stress time series exceeded 0.78 at all stations, hinting that the wind acting on the study region was another factor modulating the water-level variability. A cross-wavelet and wavelet-coherence analysis further indicated that (i) the residual water level at each station was more coherent and out-of-phase with the alongshore winds mostly at sub-inertial time scales associated with synoptic weather changes; and (ii) the residual water-level difference between the outer and inner bay was more coherent with the cross-shore winds at discrete narrow frequency bands, with the wind leading by a certain phase. The analysis also implied that the monsoon relaxation period was more favorable for the formation of the land-sea breeze, modulating the residual water-level difference.
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Keywords
residual water level
tide
wind
Sansha Bay
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Corresponding Author(s):
Jia ZHU
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Online First Date: 28 September 2016
Issue Date: 19 May 2017
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