海口湾中间岸段海滩剖面短期时空变化及沉积动态分析 *

doi:10.11978/2018120

Abstract

Abstract:

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.

Key words: beach profile, temporal and spatial variation, empirical orthogonal function, sediment, typhoon

CLC Number:

P737.13

Shibing ZHU,Danni HU,Huiling ZHANG,Chunhua ZENG,Zhehua LI,Zhiqiang LI. 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.

Figures/Tables 9

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References 22

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	第一特征函数	第二特征函数	第三特征函数	第四特征函数
特征值	0.041	0.028	0.014	0.008
所占方差/%	38.73	26.01	13.36	7.73
累计方差/%	38.73	64.74	78.10	85.83

		M_z/Φ	σ_i	S_k	K_φ	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

Analysis of short-term temporal and spatial changes and sedimentary dynamics at the middle section of Haikou Bay Beach ^*

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Analysis of short-term temporal and spatial changes and sedimentary dynamics at the middle section of Haikou Bay Beach *

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Analysis of short-term temporal and spatial changes and sedimentary dynamics at the middle section of Haikou Bay Beach ^*