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选取黄海、东海海域为研究区域,以MODIS遥感影像数据为数据源,计算了研究区的比值植被指数,利用动态阈值分割和ArcGIS空间分析方法获取了2008~2015年浒苔发生初期空间分布特点、漂移路径、空间分布和聚集度变化特征等信息。结果表明:1)浒苔最初于五月中旬到六月上旬期间出现在江苏盐城市北部和长江口附近海域。2)随着浒苔的生长和爆发,浒苔均会先向西北漂移至苏北外海海域,然后再进入黄海。其漂移路径具有明显的年际变化特征。3)在生长过程中,浒苔斑块空间分布状态整体由南向北生长、汇聚和扩张,少部分年份会出现整体漂移现象。4)进入治理期后,覆盖密度不断减小直至浒苔完全消失。通过该研究可以更好地了解浒苔灾害发生和发展规律,为其有效治理提供技术支持。
Taking the Yellow Sea and the East China Sea as the study area, the MODIS remote sensing image data was used as a data source to calculate the ratio vegetation index in the study area. Dynamic threshold segmentation and ArcGIS spatial analysis method were used to obtain the spatial distribution characteristics of the Enteromorpha species during the early period from 2008 to 2015, Drift path, spatial distribution and changes in the degree of aggregation and other information. The results showed that: 1) Enteromorpha first appeared in the northern part of Yancheng City and the vicinity of the Changjiang River estuary during mid-May to early June. 2) With the growth and outbreak of Enteromorpha, Enteromorpha will first drift to the northwestern North China Sea offshore waters before entering the Yellow Sea. Its drift path has obvious interannual variation characteristics. 3) In the process of growth, the overall spatial distribution of the plaque in the Enteromorpha species grows from south to north and converges and expands, with the overall drift occurring in a few years. 4) After entering the management period, the coverage density continues to decrease until Enteromorpha disappears completely. The research can better understand the occurrence and development of Enteromorpha disasters and provide technical support for its effective management.