台风季节朱家尖岛砂、砾质岬湾海滩的不同沉积地貌动态变化

doi:10.11978/2021091

Abstract

Abstract:

The embayed sandy and gravel beaches are important tourism resources in the coastal zone of islands, with high socio-economic and ecological values and having received study attention for years. This study focuses on five representative embayed beaches on the east coast of the Zhujiajian Island in Zhejiang Province. The beach topography and sediment data were obtained from three field campaigns in the early, middle and late stages of the 2019 typhoon season, and the nearshore hydrodynamic data were also collected and analyzed. Then, the dynamic changes of topography and sediment characteristics of five different embayed beaches were detected. The results show that the five beaches experienced different volume changes during the typhoon season, i.e., 11.93 m³·m^-1(Dashali), -54.41 m³·m^-1(Dongsha), -19.75 m³·m^-1(Qiansha), 2.19 m³·m^-1(Wushitang) and -1.96 m³·m^-1(Xiaowushitang), respectively. The gravel beaches were more stable than the sandy beaches, and the sandy beach without human activity is less eroded during the typhoon season. The mean grain size of surficial sediments on Dashali, Dongsha, Qiansha, Wushitang and Xiaowushitang during the typhoon season are 2.47 Փ, 2.24 Փ, 2.64 Փ, -5.96 Փ and -6.03 Փ, respectively, with coarsening and onshore transport being the main performances of their changes. The change of sediment grain size on sandy beaches is more significant than that on the gravel beaches. The sediment grain size, the energy level of typhoon, and the angle between the main wave direction during the typhoon and the beach orientation, and coastal engineering can have impacts on beach morphological variation during typhoon seasons. This research can provide reference for the beach management during typhoon seasons.

Key words: embayed beaches, profile morphology, grain size characteristics, human activities, typhoon season

CLC Number:

P737.13

GUO Junli, SHI Lianqiang, CHEN Shenliang, ZHANG Min, CHANG Yang, ZHANG Daheng. Dynamic variations of different sedimentary geomorphology of sandy and gravel embayed beaches on the Zhujiajian Island during typhoon season[J].Journal of Tropical Oceanography, 2022, 41(4): 82-96.

Figures/Tables 13

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台风名称	最强等级	生成时间	消亡时间	影响研究区域的时间范围
丹娜丝(Danas)	强热带风暴	7月15日17时	7月21日20时	7月19日7时—7月19日17时
利奇马(Lekima)	超强台风	8月4日14时	8月13日11时	8月9日16时—8月10日1时
玲玲(Lingling)	超强台风	9月1日20时	9月8日10时	9月6日13时—9月6日17时
塔巴(Tapah)	台风	9月18日23时	9月23日8时	9月21日11时—9月22日5时

剖面		单宽体积变化量/(m³·m^-1)
剖面		台风季节前期	台风季节后期	整个台风季节
大沙里	YA02	-10.72	27.29	16.58
	YA04	2.67	8.39	11.06
	YA06	30.98	13.30	44.28
	YA08	2.26	11.55	13.81
	YA10	-2.32	-23.79	-26.10
	平均值	4.57	7.35	11.93
东沙	DS05	3.49	-57.03	-53.54
	DS11	-77.77	-46.40	-124.17
	DS17	-80.73	-2.65	-83.39
	DS22	-9.22	-32.45	-41.67
	DS26	-1.67	-5.66	-7.33
	DS30	-9.03	-6.95	-15.97
	平均值	-35.68	-18.82	-54.51
千沙	QS01	5.40	-13.97	-8.57
	QS05	18.82	-41.74	-22.92
	QS09	27.22	-9.72	-9.72
	QS13	-43.02	-66.08	-10.91
	QS17	-4.91	-41.73	-46.63
	平均值	0.70	-34.65	-19.75

剖面		单宽体积变化量/(m³·m^-1)
剖面		台风季节前期	台风季节后期	整个台风季节
乌石塘	WST01	2.67	-0.07	2.59
	WST02	5.31	-3.63	1.68
	WST03	4.88	0.16	5.04
	WST04	2.32	-2.90	-0.58
	平均值	3.80	-1.61	2.18
小乌石塘	XWST01	1.80	1.16	2.96
	XWST02	0.21	-6.47	-6.27
	XWST03	6.05	0.28	6.33
	XWST04	2.57	-13.42	-10.85
	平均值	2.66	-4.61	-1.96

剖面		2019年7月18日			2019年8月31日			2019年9月24日
剖面		MPS	OPI	DRI	MPS	OPI	DRI	MPS	OPI	DRI
乌石塘	WST01	0.26	-1.94	0.46	0.20	-2.90	0.41	0.23	-2.22	0.42
	WST02	0.23	-2.31	0.42	0.20	-2.87	0.39	0.24	-2.04	0.42
	WST03	0.25	-1.34	0.46	0.23	-2.28	0.41	0.26	-2.47	0.40
	WST04	0.30	-1.89	0.43	0.22	-1.84	0.44	0.22	-2.08	0.43
	平均值	0.26	-1.87	0.44	0.21	-2.47	0.41	0.23	-2.20	0.42
小乌石塘	XWST01	0.23	-2.43	0.41	0.23	-0.12	0.50	0.22	-1.82	0.44
	XWST02	0.29	-0.71	0.47	0.27	-0.74	0.48	0.31	-1.09	0.46
	XWST03	0.28	-1.74	0.43	0.27	-0.59	0.47	0.34	-0.37	0.48
	XWST04	0.37	-0.03	0.51	0.21	-2.07	0.43	0.33	0.06	0.51
	平均值	0.29	-1.23	0.46	0.25	-0.88	0.47	0.30	-0.80	0.47

海滩	样方位置	2019年7月18日			2019年8月31			2019年9月24日
海滩	样方位置	MPS	OPI	DRI	MPS	OPI	DRI	MPS	OPI	DRI
乌石塘	剖面起点	0.25	-1.82	0.45	0.21	-2.87	0.41	0.22	-2.59	0.40
	砾石堤顶	0.26	-2.90	0.40	0.22	-2.21	0.42	0.24	-2.12	0.42
	潮间带	0.28	-0.89	0.47	0.21	-2.33	0.42	0.25	-1.90	0.43
小乌石塘	剖面起点	0.28	-1.61	0.44	0.25	-0.65	0.48	0.30	-1.07	0.47
	砾石堤顶	0.28	-1.61	0.44	0.22	-0.58	0.48	0.28	-1.10	0.46
	潮间带	0.33	-0.46	0.49	0.26	-1.41	0.45	0.33	-0.24	0.50

Dynamic variations of different sedimentary geomorphology of sandy and gravel embayed beaches on the Zhujiajian Island during typhoon season

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