黄、东海海域浒苔时空分布变化特征研究

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。

Research on the Characteristics of Ulva. Prolifera in Yellow Sea and East Sea

Based on the calculation of MODIS data RVI in areas of the Yellow Sea and the East China Sea during the period of 2008~2015, the information about spatial distribution characteristics in the initial stage of Ulva. Prolifera, drift paths, spatial distribution and aggregation degree of variation were obtained using threshold segmentation method and ArcGIS spatial analysis technology.The results showed that:1) Ulva. Prolifera generated firstly in the mid May and the early June and mainly located in the sea areas near north of Yancheng (Jiangsu Province) and the Yangtze river estuary. 2) With the growth and outbreak of Ulva. Prolifera, it drifted to the northwest till the offshore waters of north Jiangsu, and then into the Yellow Sea. The drift paths had obvious interannual variation characteristics. 3) During the growth, the spatial distribution characteristics of Ulva. Prolifera usually displayed a growing tendency from south to north with aggregating and expanding, while wholly drifting phenomenon occurs at times. 4) Entering the period of treatment, the coverage density of Ulva. Prolifera began to decrease until it disappeared completely. This research is contributed to the understanding of occurrence and development characteristics of Ulva. Prolifera disaster and provide technical support for the further effective management.