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Remote Sensing for Natural Resources    2023, Vol. 35 Issue (2) : 34-41     DOI: 10.6046/zrzyyg.2022296
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Satellite remote sensing-assisted comparative monitoring of dynamic characteristics of macroalgae aquaculture in Weihai City, Shandong Province, China
HOU Yingzhuo1,2,3(), JI Ling4, XING Qianguo1,2,3(), SHENG Dezhi1,2,3
1. CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China
2. Shandong Key Laboratory of Coastal Environmental Processes, Yantai 264003, China
3. University of Chinese Academy of Sciences, Beijing 100049, China
4. Yantai Marine Environment Monitoring Center, Yantai 264006, China
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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.
Keywords Sentinel-2      macroalgae      Porphyra      kelp      Shandong Peninsula      Yellow Sea     
ZTFLH:  TP79  
Issue Date: 07 July 2023
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Yingzhuo HOU
Ling JI
Qianguo XING
Dezhi SHENG
Cite this article:   
Yingzhuo HOU,Ling JI,Qianguo XING, et al. Satellite remote sensing-assisted comparative monitoring of dynamic characteristics of macroalgae aquaculture in Weihai City, Shandong Province, China[J]. Remote Sensing for Natural Resources, 2023, 35(2): 34-41.
URL:  
https://www.gtzyyg.com/EN/10.6046/zrzyyg.2022296     OR     https://www.gtzyyg.com/EN/Y2023/V35/I2/34
Fig.1  Geographical location of the study area and distribution of macroalgae cultivation areas
年份 影像日期
2016年 01-25,03-25,04-24,05-04,07-13,08-22,
09-11,11-20,12-10
2017年 01-09,03-10,04-19,05-19,08-02,09-11,
09-21,10-21,11-15,12-05
2018年 01-09,02-13,03-25,04-19,05-04,06-03,
08-02,10-21,11-10,11-30
2019年 01-24,02-23,03-25,04-14,06-23,08-17,
09-26,10-31,11-20,12-20
2020年 01-14,02-23,03-24,04-03,06-22,07-02,
09-20,10-25,11-09,12-19
2021年 01-18,02-02,03-24,04-18,05-18,07-22
Tab.1  Introduction of images
Fig.2  Technical route
Fig.3  Distribution and corresponding spectral curve of samples and frequency distribution of NDVI
Fig.4  Remote sensing monitoring results of Porphyra aquaculture during 2017—2021
Fig.5  Remote sensing monitoring results of kelp farming areas on February 23, 2020
Fig.6  Changes of the area of Porphyra aquaculture and the number of cultivation squares monitored by remote sensing
指标 紫菜养殖区 海带养殖区
2019-01-24 2019-04-14 2019-06-23 2019-10-31 2019-01-24 2019-04-14 2019-06-23 2019-10-31
OA/% 99 99 92 95 94 94 95 84
Kappa 0.99 0.97 0.84 0.89 0.87 0.88 0.90 0.68
Tab.2  Results of the accuracy evaluation
Fig.7  Seasonal changes of Porphyra culture monitoring area by remote sensing
Fig.8  Changes of the monitoring area of Porphyra and kelp culture from 2019 to 2020
Fig.9  Changes of the cultivation area of Porphyra and kelp in statistical yearbook during 2015—2020
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