侵蚀浪条件下沉水植被对沙坝-潟湖海岸的冲淤影响研究

doi:10.11978/2021079

Abstract

Abstract:

Global coastal ecological system is being threatened by climate change and human activities. Based on a typical profile of sandbar-lagoon system and designed wave flume experiments with moving bed, we carried out a quantitative analysis on the effects of submerged vegetation on erosion and deposition under erosion wave conditions. The results show that the submerged vegetation obviously weakens the wave height that increaes in the margin of surf zone on the fore slope of sandbar, and wave attenuation occurs behind the sandbar. Wave reflection and transmission coefficients reduce and wave dissipation coefficient increases due to submerged vegetation. Under the action of erosion waves, the sandbar crest was eroded distinctly, the lagoon showed a deposition trend, and the coastal foredune was eroded in a scarp form. With the influence of vegetation, the maximum erosion thickness of sandbar and foredune zone decreases. In general, vegetation can reduce the net sandbar erosion, the deposition in the lagoon and the offshore sediment transport, which has a good protective effect on the coastal foredune.

Key words: erosion wave, submerged vegetation, sandbar-lagoon, erosion and deposition, wave attenuation

CLC Number:

P737.13

CONG Xin, KUANG Cuiping, WU Yunlong, XIA Zilong. Study of the erosion and deposition in a sandbar-lagoon system influenced by submerged vegetation under erosion wave conditions[J].Journal of Tropical Oceanography, 2022, 41(4): 31-37.

Figures/Tables 9

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References 22

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工况名称	入射波高IWH/m		波周期/s		有无植被
工况名称	模型	原型	模型	原型	有无植被
T1	0.13	1.30	1.68	5.30	无(光滩)
T2	0.13	1.30	1.68	5.30	有
T3	0.16	1.60	1.80	5.70	无(光滩)
T4	0.16	1.60	1.80	5.70	有

工况名称	反射系数K_r	透射系数K_t	耗散系数K_d
T1	0.28	0.46	0.84
T2	0.22	0.36	0.91
T3	0.36	0.48	0.80
T4	0.29	0.42	0.86

位置	最大淤积厚度/cm				最大侵蚀厚度/cm
	IWH=0.13m		IWH=0.16m		IWH=0.13m		IWH=0.16m
	T1	T2	T3	T4	T1	T2	T3	T4
沙坝	5.30	6.55	6.30	6.86	13.69	12.60	16.64	14.79
潟湖	7.20	5.49	6.42	6.58	0	0	0	0
前丘	7.20	5.49	6.35	6.58	14.80	13.18	15.28	13.88

单宽输沙量/(cm³·cm^-1)		IWH=0.13m			IWH=0.16m
单宽输沙量/(cm³·cm^-1)		沙坝	潟湖	前丘	沙坝	潟湖	前丘
光滩	淤积量	211.98	371.18	166.37	197.64	532.50	94.25
	侵蚀量	1393.77	0	392.93	1730.21	0	404.06
	净输沙量	-1181.79	371.18	-226.56	-1532.57	532.50	-309.81
	总输沙量	-1037.17			-1309.88
含植被	淤积量	195.55	314.03	140.06	204.32	402.28	137.44
	侵蚀量	1216.27	0	263.48	1564.21	0	329.55
	净输沙量	-1020.72	314.03	-123.42	-1359.88	402.28	-192.11
	总输沙量	-830.11			-1149.71

Study of the erosion and deposition in a sandbar-lagoon system influenced by submerged vegetation under erosion wave conditions

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