Dynamic evolution analysis of Dongsha shoal of the radial sand ridgds in South Yellow Sea from 1973 to 2016
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摘要:
以江苏岸外辐射沙洲地区的东沙为例,基于1973—2016年长周期遥感影像,引入形态学中最小外接矩形与质心的概念,对沙洲整体运动趋势进行研究。通过ArcGIS10.2软件提取各时相的东沙滩最小外接矩形质心,对不同时期的质心进行比较,以确定东沙滩在不同时期的整体运动趋势,同时通过热带气旋与东沙滩紫菜养殖资料进一步分析东沙滩运动的影响因素。研究发现:东沙滩在43a间的总体运动方向为北东北,具体分为5个阶段,各阶段运动方向与速度有所不同; 东沙滩运动对热带气旋的响应有越来越强的趋势; 近期快速扩张的东沙滩紫菜养殖对东沙的泥沙沉积的影响还有待进一步研究。
Abstract:The Dongsha Shoal, a part of the radial sand ridges off the Jiangsu coast, is selected as a case in this paper to study the dynamic evolution of the ridge system. Based on the remote sensing images from 1973 to 2016, the concepts of minimum enclosing rectangle and centroid in morphology are introduced to reveal the general moving trend of the shoal. The centroids of minimum enclosing rectangles of each phase are extracted by means of ArcGIS10.2. The general moving trend of the Dongsha Shoal is specified by comparison of the centroids in different stages. The factors affecting the movement of Dongsha shoal is further studied with the data of nori-planting and records of tropical cyclones. The results suggest that the Dongsha Shoal has been moving toward north and northeast in the past 43 years. It can be further divided into five specific phases. The moving directions and speeds in each phases are different. Data shows that the impact of tropic cyclones is increasing in the Dongshan Shoal. The nori-planting in Dongsha Shoal expands currently, of which the impacts on the sand sediment at the Dongsha Shoal requires further researches.
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Key words:
- minimum external rectangle /
- centroid /
- dynamic /
- dynamic mechanism /
- Dongsha Shoal
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表 1 研究区影像数据和海洋环境参数
Table 1. Collection of images and marine environmental parameters
序号 成像时间 传感器 潮位/cm 1 1973-11-16 MSS 139 2 1976-3-20 MSS 144 3 1977-10-17 MSS 140 4 1979-9-10 MSS 149 5 1983-4-4 MSS 151 6 1984-3-21 MSS 147 7 1985-1-11 TM 160 8 1986-3-3 TM 151 9 1988-3-8 TM 161 10 1989-10-21 TM 146 11 1991-4-2 MSS 136 12 1992-6-7 TM 130 13 1994-12-6 TM 125 14 1995-1-7 TM 128 15 1996-1-10 TM 139 16 1997-2-13 TM 146 17 1998-1-31 MSS 151 18 1999-2-19 TM 148 19 2000-4-10 TM 139 20 2001-3-12 TM 155 21 2002-3-31 TM 153 22 2003-1-21 ETM+ 152 23 2004-5-23 TM 143 24 2005-3-31 ETM+ 144 25 2006-4-3 ETM+ 149 26 2007-1-24 TM 136 27 2008-2-28 TM 154 28 2009-6-14 ETM+ 146 29 2011-4-25 TM 199 30 2013-8-12 ETM+ 131 31 2014-2-20 ETM+ 140 32 2015-12-16 OLI 131 33 2016-1-1 OLI 138 表 2 东沙最小外接矩形质心运动趋势
Table 2. The movement trend of minimum external rectangle centroid in Dognsha Shoal
序号 时间间隔 移动距离/km 速率/(km/a) 移动方向 1 1973—1979 0.8494 0.2831 N 2 1983—1989 2.9630 0.5926 N 3 1991—1999 1.5088 0.2156 EEN 4 2000—2009 1.4402 0.1600 S 5 2011—2016 1.6718 0.4180 SES 总体 1973—2016 3.1713 0.0991 NNE -
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