Satellite remote sensing-assisted comparative monitoring of dynamic characteristics of macroalgae aquaculture in Weihai City, Shandong Province, China
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摘要: 大型海藻养殖的时空动态变化监测对其环境管理至关重要,目前关于不同品种的大型海藻养殖的对比监测鲜有研究报道。文章基于Sentinel-2卫星影像,利用归一化植被指数(normalized difference vegetation index,NDVI)与支持向量机(support vector machine,SVM),对山东省威海市文登区南部海域紫菜养殖区与荣成市南部海域海带养殖区的动态特征进行了监测。研究结果表明: ①威海市文登区的紫菜养殖在2016年遥感影像上首次出现,与该市历史上首次出现紫菜养殖的年份相符; 基于文章方法提取的紫菜养殖区与海带养殖区的整体提取效果较好,总体精度可达84%以上; ②2017—2021年度紫菜养殖区的遥感监测面积整体呈逐年增加趋势,空间上养殖区呈现远离岸边的分布趋势; ③紫菜与海带养殖区监测面积总体呈冬高、夏低的冷水型藻类养殖季节变化特征,但紫菜养殖区监测面积最小值与最大值出现时间较海带养殖区早1~2个月。卫星遥感较统计年鉴能提供更精确的时间与空间信息,研究可为中国北方海岸带大型海藻养殖管理提供监测技术与数据上的参考与借鉴。Abstract: Monitoring the spatio-temporal dynamic changes in macroalgae aquaculture is crucial to its environmental management. However, few studies have been reported on the comparative monitoring of different macroalgae species. Based on images of the Sentinel-2 satellite and using the normalized difference vegetation index (NDVI) and the support vector machine (SVM), this study monitored the dynamic characteristics of both the Porphyra aquaculture area in the sea area of southern Wendeng District, Weihai City, Shandong Province and the kelp aquaculture area in the sea area of southern Rongcheng City, Weihai City. The results show that: ① The Porphyra aquaculture in Wendeng District was first captured in the satellite images of 2016, which is the same as the first year of Porphyra aquaculture in this city; the extraction method used in this study performed well in extracting the information about both the Porphyra and the kelp aquaculture areas overall, with the overall accuracy of 84% and above; ② During 2017—2021, the Porphyra aquaculture area monitored through remote sensing increased year by year and showed a trend far away from the shore; ③ The Porphyra and kelp aquaculture areas monitored both showed seasonal variations (high in winter and low in summer) of cold-water macroalgae aquaculture, but the minimum and maximum values of the Porphyra aquaculture area appeared 1~2 months earlier than those of the kelp aquaculture area. Compared with statistical yearbooks, satellite remote sensing can provide more accurate spatio-temporal information on macroalgae aquaculture. This study can be used as a reference in terms of monitoring technology and data for the management of macroalgae aquaculture in coastal areas of northern China.
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Key words:
- Sentinel-2 /
- macroalgae /
- Porphyra /
- kelp /
- Shandong Peninsula /
- Yellow Sea
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