近50a来福建海坛海峡动力地貌演变过程

doi:10.11978/2022036

Abstract

Abstract:

The Haitan Strait in Fujian province is an important channel for the southward transportation of material from the Minjiang River and the Zhejiang-Fujian Coastal Current to the Xinghua Bay and the south-central coast of Fujian. The topographic data of the Haitan Strait in the past 50 years was analyzed using GIS tools. The results indicate that strong siltation occurred in the Haitan Strait due to the influence of several catastrophic floods in the Minjiang River Basin during 1964~1975. The Haitan Strait experienced strong erosion during 1975~1990 which is caused by water and soil conservation and reservoir constructions in the Minjiang River Basin. After that, the erosion rate declined gradually and the strait maintained slight scouring. Large-scale artificial sand mining started since 2007 that caused severe erosion in the northern part of the Strait. Before 2007, sediment discharge from the Minjiang River was the main factor restricting the geomorphological evolution of the Haitan Strait. Flood, sand mining and reservoir construction had a direct impact on the geomorphologic evolution of the strait. However, after 2007, large-scale artificial sand mining activities and reclamation projects in the strait have gradually become the main factors to affect its geomorphologic evolution.

Key words: the Haitan Strait, geomorphologic evolution, the Minjiang River, sand excavation

CLC Number:

P737.2

WANG Weibin, YAO Hongyi, YU Guangxin, ZHENG Chengzhong. Dynamic geomorphologic evolution of the Haitan Strait, Fujian province, in the past 50 years[J].Journal of Tropical Oceanography, 2022, 41(4): 105-115.

Figures/Tables 10

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References 20

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序号	资料名称	图号	比例尺	投影	深度基准面	测量时间
1	海坛海峡峡部	10609	1:35000	墨卡托投影	当地理论最低潮位面	1964年
2	海坛海峡北部	14131	1:35000	墨卡托投影	当地理论最低潮位面	1975年
3	海坛海峡南部	14151	1:35000	墨卡托投影	当地理论最低潮位面	1975年
4	海坛海峡北部	14131	1:35000	墨卡托投影	当地理论最低潮位面	1990年
5	海坛海峡南部	14151	1:35000	墨卡托投影	当地理论最低潮位面	1990年
6	海坛海峡北部	14131	1:35000	墨卡托投影	当地理论最低潮位面	1999年
7	海坛海峡南部	14151	1:35000	墨卡托投影	当地理论最低潮位面	1999年
8	海坛海峡北部	14131	1:35000	墨卡托投影	当地理论最低潮位面	2007年
9	海坛海峡南部	14151	1:35000	墨卡托投影	当地理论最低潮位面	2007年
10	海坛海峡北部	14131	1:35000	墨卡托投影	当地理论最低潮位面	2015年
11	海坛海峡南部	14151	1:35000	墨卡托投影	当地理论最低潮位面	2015年

时间段	淤积面积/km²	冲刷面积/km²	净冲淤量/(×10⁸m³)	年均冲淤量/(×10⁷m³)	年均冲淤厚度/cm
1964—1975年	150	74	1.15	1.05	4.68
1975—1990年	89	135	-1.31	-0.88	-3.93
1990—1999年	102	122	-0.23	-0.25	-1.12
1999—2007年	111	113	-0.25	-0.31	-1.37
2007—2015年	93	131	-0.88	-1.10	-4.95
1964—2015年	90	134	-1.51	-0.30	-1.32

Dynamic geomorphologic evolution of the Haitan Strait, Fujian province, in the past 50 years

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