Analysis of measured wave characteristics in the coastal waters of Cangnan, Zhejiang Province

doi:10.3969/j.issn.1001-909X.2023.03.005

Abstract

Abstract:

Based on the one-year measured wave data in the coastal area of Cangnan, Zhejiang Province, the characteristics of wave parameters were statistically analyzed, the correlation between wave parameters was analyzed by using the least square method, the relationship between the average wave duration and wave height was studied, the wave energy was estimated, and the characteristics of typical typhoon waves during typhoon “Lekima” were analyzed.The results show that the study area is mainly composed of light waves with spectral peak period of 5-9 s, the annual average significant wave height of 1.22 m, the normal wave direction is E, the strong wave direction is ENE.There is a significant linear relationship between the characteristic wave heights, which conforms to the typical Rayleigh Distribution.In typhoon free period and cold wave free period with significant wave height below 2.7 m and typhoon period with significant wave height above 4.1 m, the average duration of wave decreases exponential decays with the increase of wave height, and the attenuation rate of typhoon period with significant wave height above 4.1 m is higher than that of typhoon free period and cold wave free period with significant wave height below 2.7 m.During the impact of typhoon “Lekima”, the maximum wave height, spectral peak period, and spectral peak density show a basically synchronous process of first increasing and then decreasing, with a maximum spectral peak density of 55.10 m²/Hz;the typhoon wave spectrum before and after the impact of the typhoon show a bimodal spectrum, while the wave spectrum during the most significant period of typhoon impact show a unimodal spectrum.

Key words: wave parameters, average wave duration, wave energy, wave spectrum

CLC Number:

P731.22

ZHOU Yiming, YANG Lihua, HUAN Caiyun, LIU Rong. Analysis of measured wave characteristics in the coastal waters of Cangnan, Zhejiang Province[J]. Journal of Marine Sciences, 2023, 41(3): 43-55.

Figures/Tables 21

References 18

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年	月	月平均周期/s	月最大平均周期/s	月均有效波高/m	月最大有效波高/m	月均十分之一波高/m	月最大十分之一波高/m	月均最大波高/m	月最大波高/m
2019年	7月	4.2	6.5	1.14	2.53	1.43	3.19	1.90	4.39
	8月	4.7	8.4	1.55	7.09	1.93	9.12	2.49	10.80
	9月	4.5	7.5	1.43	3.82	1.79	5.05	2.33	7.33
	10月	4.8	8.1	1.20	5.83	1.47	7.67	1.80	8.89
	11月	5.1	9.2	1.47	4.16	2.01	5.96	2.65	7.88
	12月	4.9	8.9	1.33	3.60	1.74	5.06	2.41	6.68
2020年	1月	4.4	6.3	0.98	2.57	1.24	3.15	1.62	4.32
	2月	4.5	6.0	1.28	3.40	1.60	4.35	2.10	5.60
	3月	4.1	5.9	1.26	3.62	1.58	4.54	2.07	5.75
	4月	4.1	5.8	1.06	2.76	1.33	3.39	1.75	4.41
	5月	4.4	6.7	1.04	2.38	1.30	3.02	1.72	4.05
	6月	3.8	5.0	1.24	2.40	1.55	3.08	2.05	4.19

年	月	月平均周期/s	月最大平均周期/s	月均有效波高/m	月最大有效波高/m	月均十分之一波高/m	月最大十分之一波高/m	月均最大波高/m	月最大波高/m
2019年	7月	4.2	6.5	1.14	2.53	1.43	3.19	1.90	4.39
	8月	4.7	8.4	1.55	7.09	1.93	9.12	2.49	10.80
	9月	4.5	7.5	1.43	3.82	1.79	5.05	2.33	7.33
	10月	4.8	8.1	1.20	5.83	1.47	7.67	1.80	8.89
	11月	5.1	9.2	1.47	4.16	2.01	5.96	2.65	7.88
	12月	4.9	8.9	1.33	3.60	1.74	5.06	2.41	6.68
2020年	1月	4.4	6.3	0.98	2.57	1.24	3.15	1.62	4.32
	2月	4.5	6.0	1.28	3.40	1.60	4.35	2.10	5.60
	3月	4.1	5.9	1.26	3.62	1.58	4.54	2.07	5.75
	4月	4.1	5.8	1.06	2.76	1.33	3.39	1.75	4.41
	5月	4.4	6.7	1.04	2.38	1.30	3.02	1.72	4.05
	6月	3.8	5.0	1.24	2.40	1.55	3.08	2.05	4.19

波级	有效波高/m	出现频率/%
波级	有效波高/m	观测期间	春季	夏季	秋季	冬季
小浪	[0.1,0.5)	2.98	0.23	0.80	0.81	1.14
轻浪	[0.5,1.25)	57.46	17.62	13.52	12.35	13.97
中浪	[1.25,2.5)	35.90	6.94	9.80	9.99	9.17
大浪	[2.5,4.0)	3.16	0.30	0.64	1.68	0.54
巨浪	[4.0,6.0)	0.42	0	0.34	0.08	0
狂浪	[6.0,9.0)	0.08	0	0.08	0	0

波级	有效波高/m	出现频率/%
波级	有效波高/m	观测期间	春季	夏季	秋季	冬季
小浪	[0.1,0.5)	2.98	0.23	0.80	0.81	1.14
轻浪	[0.5,1.25)	57.46	17.62	13.52	12.35	13.97
中浪	[1.25,2.5)	35.90	6.94	9.80	9.99	9.17
大浪	[2.5,4.0)	3.16	0.30	0.64	1.68	0.54
巨浪	[4.0,6.0)	0.42	0	0.34	0.08	0
狂浪	[6.0,9.0)	0.08	0	0.08	0	0

波向	出现频率/%
波向	小浪	轻浪	中浪	大浪	巨浪	狂浪	合计
N	0	0.05	0.02	0	0.01	0	0.08
NNE	0	0.07	0.26	0.03	0.03	0	0.39
NE	0.42	3.70	10.68	1.69	0.03	0	16.52
ENE	0.31	8.37	6.12	0.35	0.01	0.02	15.18
E	0.66	14.6	6.87	0.28	0.01	0.06	22.48
ESE	0.77	12.38	2.35	0.21	0.08	0	15.79
SE	0.47	8.15	1.53	0.14	0	0	10.29
SSE	0.17	3.54	1.24	0.19	0.07	0	5.21
S	0.09	3.25	1.76	0.13	0.07	0	5.30
SSW	0.07	2.55	4.99	0.13	0.10	0	7.84
SW	0	0.34	0.08	0.01	0	0	0.43
WSW	0.01	0.25	0	0	0	0	0.26
W	0.01	0.11	0	0	0	0	0.12
WNW	0	0.03	0	0	0	0	0.03
NW	0	0.06	0	0	0.01	0	0.07
NNW	0	0.01	0	0	0	0	0.01
合计	2.98	57.46	35.90	3.16	0.42	0.08	100