基于GOCI数据的浙江沿海赤潮监测  

Red Tide Monitoring along the Coast of Zhejiang Province Based on GOCI Data

作　　者：李阳东[1,2,3,4] 李仁虎 常亮 LI Yangdong;LI Renhu;CHANG Liang(College of Marine Science,Shanghai Ocean University,Shanghai 201306,China;Key Laboratory of Oceanic Fisheries Exploration,Ministry of Agriculture and Rural Affaires,Shanghai 201306,China;Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources,Ministry of Education,Shanghai 201306,China;Shanghai Engineering Research Center of Estuarine and Oceanographic Mapping,Shanghai 201306,China)

机构地区：[1]上海海洋大学海洋科学学院,上海201306 [2]农业农村部大洋渔业开发重点实验室,上海201306 [3]大洋渔业资源可持续开发教育部重点实验室,上海201306 [4]上海市河口海洋测绘工程技术研究中心,上海201306

出　　处：《生态环境学报》2020年第8期1617-1624,共8页Ecology and Environmental Sciences

基　　金：国家自然科学基金项目(41506211);国家重点研发计划(2019YFD0901404)。

摘　　要：浙江是一个拥有丰富海洋资源的海洋大省,同时浙江沿海也是赤潮高发区,开展浙江海域赤潮监测的研究对于浙江省海洋生态保护和海洋经济发展具有重要的意义。遥感技术可以实现赤潮的高效监测,在赤潮监测研究中被广泛应用。文章基于高时空分辨率GOCI影像研究浙江沿海的赤潮监测。首先使用紫外波段大气校正方法获得GOCI的遥感反射率数据,进而基于遥感反射率数据反演得到浙江沿海的总悬浮物浓度(Total Suspended Particulate Matter,TPM)和赤潮指数(Red Tide Index,RI),最后在通过实验获得用于浙江沿海赤潮信息提取的TPM和RI的最佳阈值后进行赤潮监测。统计分析结果表明TPM和RI的最佳阈值分别为17 mg·L^−1和0.23,即当水体TPM不大于17 mg·L^−1且RI不小于0.23时判断为赤潮水体。使用TPM和RI最佳组合阈值提取2011—2016年间5次较为典型的赤潮事件的面积误差范围为20.45%—127.34%,平均面积误差为64.86%,表明本文赤潮提取结果的误差是可接受的;同时提取到的赤潮分布及位置信息亦与海洋公报中的记录基本吻合。赤潮提取结果所具有的位置准确性和较小的面积误差说明该文的方法可用于浙江沿海赤潮监测的参考。最后,又以2011年5月29日温州海域和2014年5月23日舟山海域的赤潮事件为例进行了浙江海域赤潮的日变化规律研究。结果表明浙江海域的赤潮发生面积存在明显的先增后减的日变化规律,并且在正午时刻左右达到最大值,这种赤潮面积的日变化可能与浮游植物昼夜垂直迁移有关。Zhejiang is a big province which owns rich marine resources.However,red tide occurs frequently along the coast of Zhejiang.Therefore,the study of coastal red tide monitoring in Zhejiang is of great significance to the protection of marine ecology and the development of marine economy in Zhejiang Province.Remote sensing technology can realize the efficient monitoring of red tide,which is widely used in the research of red tide monitoring.This study focuses on red tide monitoring along the coast of Zhejiang based on GOCI imagery with high spatial and temporal resolution.Firstly,the ultraviolet atmospheric correction method(UV-AC)was used to obtain the remote sensing reflectance data of GOCI,and then the total suspended particulate matter concentration(TPM)and red tide index(RI)of Zhejiang coast were retrieved based on the remote sensing reflectance data.Finally,red tide monitoring was carried out after obtaining the optimal thresholds of TPM and RI for the extraction of red tide information along the coast of Zhejiang through experiments.The statistical analysis results showed that the optimal thresholds of TPM and RI were 17 mg·L^−1 and 0.23,respectively.When the TPM is not more than 17 mg·L^−1 and the RI is not less than 0.23,it can be regarded as red tide water.Using the optimal combination threshold of TPM and RI,the area error range of five typical red tide events from 2011 to 2016 was 20.45%–127.34%,and the average area error was 64.86%,indicating that the error of the red tide extraction results in this paper was acceptable.At the same time,the extracted red tide distributions and locations of the red tides were also consistent with the records in the ocean bulletin.The location accuracy and small area error of the red tide extraction results indicated that the proposed approach could be used as a reference for red tide monitoring in the coastal areas of Zhejiang.Finally,the diurnal variations of red tides in the waters of Zhejiang province were investigated by taking the events of red tides in the w

关 键 词：浙江沿海 赤潮监测 总悬浮物浓度 赤潮指数 GOCI 

分 类 号：X55[环境科学与工程—环境工程]