钦州湾人工海滩剖面变化过程

doi:10.11978/2021096

Abstract

Abstract:

The dynamic process of beach profile changes under the actions of waves and tides is the key to understanding coastal evolution, coastal defence design and tourism resource planning. Taking an artificial beach in the Shajing Peninsula of the Qinzhou Bay in Guangxi province as the study area, the study aims to explore the dynamic process of beach profile changes by analyzing the erosion and single-width volume of beach profile, as well as using EOF (Empirical Orthogonal Function) to reveal its model, based on the monthly surveyed profile elevation data from January 2018 to December 2019 using by GPS-RTK, The main results were shown as followed: (1) during the observation period, the artificial beach profile showed a regular variation characterized by accretion in winter and spring and erosion in summer and autumn; (2) due to the transverse sediment transport over the artificial beach, the single-width volumes of beach profile displayed opposite variation trends in adjacent transversal zones, which was manifested by a alternation between erosion and accretion; (3) the variation modes of artificial beach profiles could be divided into three parts that include the main model that beach profile elevations decreased significantly due to heavy rainfall and typhoon, the secondary model that the beach profile recovered gradually after heavy rainfall and typhoon under the influences of tides and normal waves, and the third model that beach profile changes resulted from wave breaking-induced currents under the action of normal waves.

Key words: beach profile changes, wave and tide actions, Empirical Orthogonal Function, transversal zones, artificial beach

CLC Number:

P737.13

FENG Bingbin, WANG Riming, LI Shushi, HUANG Hu, HU Baoqing. Changes of the artificial beach profile in the Qinzhou Bay[J].Journal of Tropical Oceanography, 2022, 41(4): 51-60.

Figures/Tables 11

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模态	特征值	模态贡献率/%	累计贡献率/%
第一模态	3.53	56.78	56.78
第二模态	0.98	17.13	73.91
第三模态	0.40	7.21	81.12

Changes of the artificial beach profile in the Qinzhou Bay

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