20世纪40年代初以来中国大陆沿海主要海湾形态变化

doi:10.11821/dlxb201601009

Abstract

Abstract:

Impacted by climate changes and human activities, the coastal zone of China has undergone various dramatic changes, among which, shape change of major gulfs (including bays and estuaries) is one of the most important aspects. In this paper, spatial dataset of gulf shoreline and gulf shape in seven phases since the early 1940s was delineated based on topographic maps and remote sensing imageries, and a group of indices including the ratio of natural shoreline, the shoreline utilization degree, shoreline swing direction, gulf area, gulf shape index and gulf centroid were used to analyze the spatial-temporal characteristics of gulfs in detail. It turned out that: in general, shape changes of major gulfs in the mainland of China were significant and complicated during the past 70 years, specifically, visible changes of shoreline structure, especially the decreases in both length and ratio of natural shoreline took place; the shoreline utilization degree increased remarkably because more and more natural shoreline had been artificalized; the fact that shoreline seaward shift caused by sea reclamation occurred in the majority of gulfs; spatial size (area) decreased in most of gulfs due to the fast and extensive sea reclamation; the geometric shape of most gulfs had become more complicated while the discrepancies among all the gulfs were narrowed; the centroid of most gulfs moved toward the sea; gulf-shape variations exhibited remarkable spatio-temporal differences. It is obvious that human activities, especially sea reclamation, have become the key driving force of gulf shape change since 1990. Based on the above-mentioned findings, classification management strategy based on dominant-function oriented gulf classification is strongly recommended, and gulf-based management should be strengthen in order to improve the abilities of Integrated Coastal Zone Management (ICZM) practices in China.

Key words: gulf, shoreline structure, shoreline change, gulf area, gulf shape index, gulf centroid, sea reclamation, China

HOU Xiyong,HOU Wan,WU Ting. Shape changes of major gulfs along the mainland of Chinasince the early 1940s[J].Acta Geographica Sinica, 2016, 71(1): 118-129.

Figures/Tables 10

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References 17

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海区	海湾名称	数量
渤海	营城子湾,金州湾,普兰店湾,董家口湾,葫芦山湾,复州湾,太平湾,锦州湾,渤海湾,莱州湾	10
黄海	青堆子湾,常江澳,窑湾,大连湾,套子湾,芝罘湾,四十里湾,双岛港,威海湾,朝阳港,荣成湾--俚岛湾,爱连湾,桑沟湾,石岛湾,靖海湾--五垒岛湾,险岛湾,乳山湾,丁字湾,横门湾,北湾(鳌山湾),崂山湾,沙子口湾,胶州湾,灵山湾,崔家潞,琅琊湾,海州湾	27
东海	长江口,杭州湾,象牙港,三门湾,浦坝港,涂茨--爵溪湾,门前涂湾,高湾--昌国湾,台州湾,隘顽湾,漩门湾,乐清湾,温州湾,大渔--鱼寮湾,沿浦湾,沙埕湾,福宁湾,三沙湾,罗源湾,福清湾,兴化湾,湄洲湾,泉州湾,围头湾--厦门港,佛昙湾,旧镇湾,东山湾,诏安湾,宫口湾	29
南海	汕头湾,海门湾,碣石湾,红海湾,大亚湾,大鹏湾,珠江口,广海湾,镇海湾,海陵湾--北津港,水东港,湛江港--雷州湾,安铺港,铁山港,廉州湾,大风江口,钦州湾,防城港,珍珠港	19

代码	利用方式分类	说明
1	丁坝与突堤岸线	丁坝:与海岸成一定角度向外伸出,具有保滩和挑流作用的护岸建筑物;突堤:一端与岸连接,一端伸入海中的实体防浪建筑物.
2	港口码头岸线	港池与航运码头形成的岸线
3	围垦(中)岸线	正在建设中的围海堤坝
4	养殖围堤岸线	用于养殖的人工修筑堤坝
5	盐田围堤岸线	用于盐碱晒制而围垦的堤坝
6	交通围堤岸线	用于交通运输的人工修筑堤坝
7	防潮堤岸线	分隔陆域和水域的其他海堤护岸工程(非养殖区,非盐田区,且交通功能不显著的海堤/海塘工程)
8	自然岸线	未利用的岸线

	海区	1940s	1960s	1970s	1990	2000	2010	2014	1940s-2014年变化	1990-2014年变化
平均值	黄海	1.94	2.15	1.87	1.89	1.93	2.12	2.19	0.26	0.30
	渤海	2.01	2.03	1.85	1.91	2.01	2.49	2.51	0.51	0.60
	东海	2.62	2.72	2.52	2.55	2.56	2.71	2.78	0.16	0.24
	南海	3.09	3.35	2.90	2.91	2.96	2.96	3.01	-0.08	0.11
	所有	2.44	2.60	2.32	2.35	2.38	2.55	2.62	0.18	0.27
最大值	黄海	2.95	3.40	2.98	3.13	3.13	3.37	4.24	1.84	1.77
	渤海	2.97	3.06	2.62	2.70	3.01	4.24	4.00	1.21	1.30
	东海	5.27	5.65	5.50	5.46	5.63	5.76	5.75	3.14	2.58
	南海	6.31	7.24	4.81	4.84	4.89	4.89	4.90	0.82	0.89
最小值	黄海	1.18	1.40	1.06	1.07	1.07	1.40	1.34	-0.89	-0.12
	渤海	1.37	1.38	1.38	1.46	1.49	1.53	1.40	-0.03	-0.26
	东海	1.59	1.72	1.66	1.64	1.61	1.65	1.63	-0.81	-0.11
	南海	1.49	1.64	1.55	1.51	1.55	1.55	1.53	-1.48	-1.61

位移距离(km)	1940s-1990年	1990s-2014年	1940s-2014年
< 0.5	29	53	19
0.5~1	21	10	22
1~2	17	17	21
2~3	7	1	10
3~4	9	1	5
4~5	2	2	4
> 5	0	1	4
最大值(km)	4.57	13.14	14.30
最小值(km)	0.00	0.00	0.06
平均值(km)	1.20	0.77	1.70
位移速度(m/a)	26.68	31.98	24.27

Shape changes of major gulfs along the mainland of Chinasince the early 1940s

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