中文摘要：

浒苔是我国近海一种新型的海洋生态灾害，自2008年以来，每年5-8月份在黄海海域周期性暴发与消亡，给沿海地区造成不同的环境影响和经济损失。基于2008年-2012年五年的M ODIS数据，计算了山东半岛海域长时间序列NDVI ，利用阈值分割法提取浒苔信息，并进一步获得爆发的时间、面积、相对聚集密度、影响范围及浒苔漂浮路径。结果表明：2008年以来各年浒苔最早发生在5月中旬至6月上旬，6月中旬至7上旬进入爆发期，浒苔面积、影响范围及浒苔密度达到最大值，其相对聚集密度峰值一般早于或晚于爆发期一个生长阶段，最终于7月下旬或8月上旬进入消亡期，平均持续时间约为71天。浒苔漂浮路径整体为从东南外海逐渐开始向西北近海海域靠近。从浒苔面积、影响范围、相对聚集密度等多项指标综合看，2008年和2009年两年浒苔爆发较为严重。

英文摘要：

In the present study ,the MODIS data were used to monitor the situation of Ulva .proliferain the Shandong Peninsu-la waters during the period of 2008-2012 .Those studies mainly calculate the area of NDVI ,and get the information of the time , area ,scope ,floating path of Ulva .prolifera by using threshold segmentation method .The feasibility of monitoring Ulva .pro-lifera information based on MODIS data and the macroscopic regularity of the outburst of Ulva .proliferawas elementally stud-ied .The results showed that Ulva .proliferafirst generated in the middle of May or early June ,the time ,area ,scope of Ulva . prolifera reached a maximum ,but the relative crowding density was earlier or later when Ulva .proliferadeveloped into a out-burst .Finally ,Ulva .prolifera died away after existing for 71 days in the late July or the early August .Wholly ,the floating path moved to the northwest from off the coast to offshore .Based on those aspects above ,the outburst of Ulva .prolifera in 2008 and 2009 was more serious than others .