Journal of Tropical Oceanography >
Analysis of short-term temporal and spatial changes and sedimentary dynamics at the middle section of Haikou Bay Beach *
Copy editor: YIN Bo
Received date: 2018-11-14
Request revised date: 2019-03-24
Online published: 2019-10-09
Supported by
National Natural Science Foundation of China(41676079)
Project of Enhancing School with Innovation of Guangdong Ocean University(Q18307)
Copyright
Beach evolution is an important topic in beach morphodynamic research. Based on beach profile data and surface sediment data observed for consecutive 33 days at the middle section of Haikou Bay Beach, characteristics of beach profile changes and sediment dynamics were analyzed. The empirical orthogonal function (EOF) analysis results showed that the profile variation contains four modes during the observation period, which corresponded to the beach construction process by swells, the beach erosion process by seas induced by local wind, the erosion process by typhoons, and the adjustment of characteristic topography, respectively. Influences of swells and seas on the beach profile were modulated by tide level. The analysis of beach profile variation and the geological background showed that Haikou Bay Beach has the characteristics of sheltered beach. Results also showed that grain size parameters of sediment were sensitive to beach changes, and can provide more abundant information on beach evolution.
ZHU Shibing , HU Danni , ZHANG Huiling , ZENG Chunhua , LI Zhehua , LI Zhiqiang . Analysis of short-term temporal and spatial changes and sedimentary dynamics at the middle section of Haikou Bay Beach *[J]. Journal of Tropical Oceanography, 2019 , 38(5) : 77 -85 . DOI: 10.11978/2018120
表2 台风“塔拉斯”前后研究区海滩沉积物特征空间分布表Tab. 2 Spatial distribution of beach sediments in the study area before and after the typhoon |
Mz/Φ | σi | Sk | Kφ | 砂砾/% | 极粗砂/% | 粗砂/% | 中砂/% | 细砂/% | 极细砂/% | ||
---|---|---|---|---|---|---|---|---|---|---|---|
台 风 前 | 潮上带 | 2.45 | 0.45 | -2.31 | 6.81 | 0.00 | 0.07 | 1.71 | 16.23 | 78.46 | 3.53 |
潮间带 | 2.34 | 0.80 | -1.21 | 9.28 | 1.07 | 2.52 | 3.79 | 15.43 | 73.65 | 3.55 | |
潮下带 | 1.80 | 0.91 | -0.79 | 3.34 | 0.83 | 0.77 | 21.67 | 33.38 | 39.65 | 1.40 | |
平均值 | 2.20 | 0.72 | -1.00 | 6.48 | 0.95 | 1.12 | 9.06 | 21.68 | 63.92 | 2.83 | |
台 风 后 | 潮上带 | 1.98 | 0.66 | -0.64 | 2.69 | 2.43 | 15.49 | 15.45 | 35.03 | 31.25 | 0.35 |
潮间带 | 1.38 | 1.12 | -0.69 | 2.31 | 0.00 | 2.35 | 13.31 | 33.50 | 50.32 | 0.52 | |
潮下带 | 1.94 | 0.76 | -1.08 | 3.69 | 0.00 | 0.04 | 12.83 | 37.36 | 48.99 | 0.78 | |
平均值 | 1.77 | 0.84 | -0.80 | 2.90 | 0.75 | 3.19 | 11.12 | 27.52 | 55.18 | 1.85 |
注: Mz: 平均粒径; σi: 分选系数; Sk: 偏态; Kφ: 峰态系数 |
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