Spatio-temporal evolution and driving factors analysis of the coastline in Nan’ao Island from 1976 to 2021

doi:10.3969/j.issn.1001-909X.2023.02.006

Abstract

Abstract:

Coastline is one of the important geographical elements to describe the boundary between land and sea. Under the dual influence of natural factors and socio-economic factors, coastline dynamic evolution of different intensities continues to occur. Based on Landsat series satellite remote sensing images, the spatial and temporal evolution of the coastline of Nan’ao Island from 1976 to 2021 was analyzed by RS and GIS technology combined with field investigation, and the driving factors were analyzed by grey correlation analysis. The results show that : (1)In the past 45 years, the coastline of Nan’ao Island has changed significantly. The coastline length has increased by 11.06 km, and the fractal dimension have generally increased.(2)During the study period, the type of coastline changed from natural coastline dominated by bedrock to artificial coastline, the comprehensive index of coastline utilization show an increasing trend, and the main structure of coastline development and utilization show a form of single to multiple.(3)The evolution of the coastline of Nan’ao Island has obvious regional differences. That of Houzhai Town is greatly affected by human factors, and its evolution is more significant. The coastlines of Yun’ao and Shen’ao Towns are mainly affected by natural factors, and their evolutions are relatively slow.(4)Typhoon(natural disasters) and population are the main driving factors of the coastline evolution of Nan’ao Island.

Key words: Nan’ao Island, coastline, remote sensing, change analysis

CLC Number:

P737.1

NING Zihao, JIANG Changbo, LONG Yuannan, WU Zhiyuan, MA Yuan. Spatio-temporal evolution and driving factors analysis of the coastline in Nan’ao Island from 1976 to 2021[J]. Journal of Marine Sciences, 2023, 41(2): 71-82.

Figures/Tables 16

References 30

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序号	遥感数据类型	成像时间	轨道号	空间分辨率/m
1	Landsat2 MSS	1976-11-10	129-44	60
2	Landsat5 TM	1986-12-23	120-44	30
3	Landsat5 TM	1996-10-31	120-44	30
4	Landsat7 ETM	2001-11-22	120-44	30
5	Landsat7 ETM	2008-12-11	120-44	30
6	Landsat8 OLI_TIRS	2013-12-01	120-44	30
7	Landsat8 OLI_TIRS	2017-11-10	120-44	30
8	Landsat8 OLI_TIRS	2021-12-07	120-44	30

序号	遥感数据类型	成像时间	轨道号	空间分辨率/m
1	Landsat2 MSS	1976-11-10	129-44	60
2	Landsat5 TM	1986-12-23	120-44	30
3	Landsat5 TM	1996-10-31	120-44	30
4	Landsat7 ETM	2001-11-22	120-44	30
5	Landsat7 ETM	2008-12-11	120-44	30
6	Landsat8 OLI_TIRS	2013-12-01	120-44	30
7	Landsat8 OLI_TIRS	2017-11-10	120-44	30
8	Landsat8 OLI_TIRS	2021-12-07	120-44	30

类型		海岸线特征
自然岸线	基岩岸线	岸线较曲折,明暗界限明显,色调深或呈灰白色。
自然岸线	砂质岸线	海域和陆域分界非常明显,岸线平直,常形成一条与海岸平行的滩脊。
人工岸线	港口码头岸线	海陆分界明显,一般呈现规则长条状,可见突堤。
	建设岸线	海陆分界明显,形状规则,有人工痕迹,呈亮白色。
	渔业岸线	颜色近于海水,呈蓝色至深蓝色;岸线比较规则且密集,多分布在基岩岸段和砂质岸段周边。

类型		海岸线特征
自然岸线	基岩岸线	岸线较曲折,明暗界限明显,色调深或呈灰白色。
自然岸线	砂质岸线	海域和陆域分界非常明显,岸线平直,常形成一条与海岸平行的滩脊。
人工岸线	港口码头岸线	海陆分界明显,一般呈现规则长条状,可见突堤。
	建设岸线	海陆分界明显,形状规则,有人工痕迹,呈亮白色。
	渔业岸线	颜色近于海水,呈蓝色至深蓝色;岸线比较规则且密集,多分布在基岩岸段和砂质岸段周边。

岸线结构	说明
单一	每1类岸线比例超过70%
二元	每1类岸线比例不超过70%,但存在2类岸线比例超过10%
三元	每1类型岸线比例不超过70%,但存在3类岸线比例超过10%
多元	每1类型岸线比例不超过70%,但存在4类岸线比例超过10%
无主体	每1类型岸线比例不超过15%