雷州半岛南部海滩对1720号台风(卡努)的响应研究

doi:10.11978/2018024

Abstract

Abstract:

Observations and research on beach responses to storms help deepen our understanding of beach processes. Typhoon Khanun (No. 1720) made landfall in Xuwen, Guangdong on October 16, 2017. The typhoon caused significant impacts on the beaches along the southern Leizhou Peninsula. Based on the field profile survey and sediment sampling before and after the typhoon landfall, beach response characteristics are investigated in this study. The main results show the following. (1) Under extreme wave conditions, the surface sediment became coarser and the sorting was worse. Beach states transformed toward more dispersed states to buffer and adapt to the high intensity wave energy. (2) Beaches and different segments in the same beach had different responses. These differences were influenced by the headlands, bays’ orientations and sizes. Submarine bar or beach berm may occur on the beach profile. Attention should be paid to the roles of geological and geomorphologic factors when studying beach responses to storms. (3) Changes of the Dengloujiao Beach were influenced by the reef flat and the huge sandy headland. The beach response of beach-coral reef flat system to storm needs further study. More detailed observations and studies of beach responses to storms are needed in the future.

Key words: Leizhou Peninsula, typhoon, beach response, beach profile, morphodynamic state

Shibing ZHU, Zhiqiang LI. Study on beach response to Typhoon Khanun (No. 1720) along southern Leizhou Peninsula[J].Journal of Tropical Oceanography, 2019, 38(1): 96-104.

Figures/Tables 6

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References 37

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时刻	中心位置	最大风速/(m·s^-1)	中心气压/hPa	移动速度/(km·h^-1)	移动方向	7级风圈半径/km
2017-10-15T22:00	111.6°E, 20.6°N	38	965	20	W	280
2017-10-15T23:00	111.4°E, 20.6°N	35	970	20	WWS	200
2017-10-16T00:00	111.1°E, 20.6°N	33	975	20	WWS	180
2017-10-16T01:00	110.9°E, 20.7°N	30	980	20	WWS	180
2017-10-16T02:00	110.7°E, 20.7°N	28	985	20	W	180
2017-10-16T03:00	110.5°E, 20.6°N	28	985	20	W	180
2017-10-16T04:00	110.3°E, 20.6°N	25	990	15	WWS

	北部湾	琼州海峡	雷州半岛东部
2017-10-13	1.8~2.3	1.8~2.3	2.5~3.5
2017-10-14	2.0~2.5	2.0~2.5	3.0~4.0
2017-10-15	2.0~2.8	2.0~2.8	7.0~10.0
2017-10-16	5.0~7.0	5.0~7.0	7.0~10.0
2017-10-17	2.0~3.0	1.8~2.3	1.8~2.3

剖面	M_d			Q_D			S_K			M_O
剖面	前	后	ΔM_d	前	后	ΔQ_D	前	后	ΔS_K	前	后	ΔM_O
T1	2.11	1.96	-0.15	3.84	5.03	+1.19	-0.04	-0.15	-0.11	0.07	0.08	+0.01
T2	1.99	2.18	+0.19	2.55	6.30	+3.75	-0.12	-0.37	-0.25	0.08	0.25	+0.17
T3	2.50	2.52	+0.02	2.69	2.55	-0.13	-0.28	-0.12	+0.16	0.25	0.17	-0.07
T4	2.51	2.52	+0.01	2.37	2.41	+0.04	-0.14	-0.06	+0.08	0.21	0.12	-0.09
T5	2.46	2.51	+0.05	1.98	2.40	+0.42	-0.18	-0.19	-0.01	0.15	0.22	+0.07
T6	2.52	2.57	+0.05	4.30	2.39	-1.91	-0.34	-0.20	+0.13	0.26	0.17	-0.09
T7	2.51	2.54	+0.03	3.20	2.74	-0.46	-0.15	-0.21	-0.06	0.13	0.21	+0.08
T8	2.58	2.50	-0.07	3.44	3.00	-0.44	-0.18	-0.09	+0.09	0.18	0.11	-0.07
T9	2.31	2.98	+0.68	3.98	6.20	+2.22	-0.03	-0.16	-0.13	0.09	0.04	-0.05
T10	2.71	3.02	+0.31	3.31	7.25	+3.94	-0.24	-0.15	+0.09	0.19	0.06	-0.12

						剖面
		T1	T2	T3	T4	T5	T6	T7	T8	T9	T10
台风前	Ω	1.53	0.39	3.78	4.78	6.24	25.41	25.42	20.26	11.76	22.38
台风前	海滩状态	过渡	反射	过渡	过渡	消散	消散	消散	消散	消散	消散
台风后	Ω	2.3	3.43	19.46	20.68	20.36	34.93	27.24	27.04	28.64	32.69
台风后	海滩状态	过渡	过渡	消散	消散	消散	消散	消散	消散	消散	消散

Study on beach response to Typhoon Khanun (No. 1720) along southern Leizhou Peninsula

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