海南岛峨蔓五彩湾内海蚀平台对海蚀崖侵蚀的影响研究

doi:10.11978/2023169

Abstract

Abstract:

The intensification of extreme wave marine hazard induced by global ocean change is very likely to accelerate the geo-hazard risk of cliff erosion in Hainan Island. Shore platforms are expected to effectively attenuate wave energy approaching the shore and consequently reduce the erosive impact of extreme waves on cliff. Shore platforms are commonly observed in volcanic rocky coasts on NW Hainan Island, providing an ideal natural laboratory to evaluate the effect of shore platform morphology on cliff erosion. This study employs the Wucaiwan Bay rocky coastline in the E’man Town, Danzhou City, Hainan Island as the study area. Time-lapsed marine remote sensing images revealed the cliff erosion rate is about 0.26 m·a^-1 in the last decade in the area. Physical oceanography analysis suggested a maximum significant wave height of 7.8 m could be expected visiting the area in a 100-years return level. The geomorphological characteristics of the sloping shore platform and the rock strength of cliffs were further surveyed via coastal geomorphological approaches. Numerical computation outputs suggest the shore platforms is capable of reducing the wave erosional forces on cliff by over 80% under future extreme wave conditions. This study further discusses the natural coastal protection from sediment beaches, vegetations and in situ deposition of eroded boulders at rock cliff foot.

Key words: shore platform, cliff erosion, basalt coast, numerical computation, Hainan Island

ZHAO Zhongwei, WU Lingyun, GAO Weijian, LI Wei. A study of the effect of shore platform morphology on coastal erosion of rocky cliffs in the Wucaiwan Bay, E’man, Hainan Island[J].Journal of Tropical Oceanography, 2024, 43(5): 106-115.

Figures/Tables 10

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测试点编号	施密特锤平均反弹参数/mm	海岸岩石的单轴抗压强度/Mpa	测试点位置
SP1	12	3.36	海蚀崖表面
SP2	11	3.13	海蚀崖表面
SP3	15	4.14	海蚀崖表面
SP4	33	14.61	海蚀崖表面
SP5	43	29.42	海蚀崖表面
SP6	46	36.29	海蚀崖底部侵蚀滑塌堆积物
SP7	14	3.86	古海蚀平台迎浪面
SP8	46	36.29	古海蚀平台迎浪面

波高工况	输入波高/m	海蚀平台衰减后最大波高/m		海蚀平台衰减后平均波高/m	最大海蚀崖侵蚀速率/(m·a^-1)	最小海蚀崖侵蚀速率/(m·a^-1)	平均海蚀崖侵蚀速率/(m·a^-1)	海蚀平台平均衰减效果/%
近破波浪
年平均有效	0.61	0.37	0.24	0.26	0	0	0	57.38
年平均最大	3.56	1.95	0.34	0.70	14.49	0.26	3.60	80.33
10年回归周期最大	4.98	2.71	0.37	0.90	20.10	0.30	4.64	81.92
50年回归周期最大	6.92	3.74	0.40	1.16	27.77	0.35	6.04	83.23
100年回归周期最大	7.80	4.21	0.42	1.27	31.25	0.37	6.67	83.72
已破波浪
年平均有效	0.61	0.37	0.24	0.26	0	0	0	57.38
年平均最大	3.56	1.95	0.34	0.70	5.24	0.10	1.30	80.33
10年回归周期最大	4.98	2.71	0.37	0.90	19.39	0.29	4.47	81.92
50年回归周期最大	6.92	3.74	1.16	0.40	26.79	0.34	5.83	83.23
100年回归周期最大	7.80	4.21	0.41	1.27	30.15	0.36	6.44	83.72

A study of the effect of shore platform morphology on coastal erosion of rocky cliffs in the Wucaiwan Bay, E’man, Hainan Island

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