To enhance the prediction accuracy of waves in multi-island sea regions
this study uses the measured wave data of 57 typhoons in the Yangtze River Estuary and the coastal waters of Zhejiang Province from 1987 to 2022 to investigate the attenuation coefficients of wave height in various sea areas through data processing and analysis. The leef-sheltering coefficients is employed to quantify the influence of reef location
size and other factors on the average periods of mixed waves. Based on the measured wave height-period relationship of mixed waves
a method for determining the maximum and minimum periods of mixed waves is proposed. Finally
the friction coefficient of the wave bottom in the study area is calculated by using theoretical formulas. As shown in the results
the wave height gradually diminishes during the wave propagation towards the inshore
and the wave energy attenuates more rapidly in the areas with numerous islands than in open areas without islands. In a multi-island sea area
the period of mixed waves will gradually decrease under the effect of reef shielding
while the degree of period reduction increases with the increase of the reef shielding degree. For a certain wave height
the wave-period relationship of the strong wave direction at offshore stations can be regarded as the maximum possible period of the mixed wave
while the wave-period relationship of the wind waves can be taken as the minimum possible period of the mixed wave. As demonstrated in the calculation
in the Yangtze River Estuary and the near-shore regions of Zhejiang Province
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