基于HY-1C/D卫星数据的2021年黄海海域大型藻类时空分布特征分析

Spatial and temporal distribution characteristics of macroalgae in the Yellow Sea in 2021 based on HY-1C/D satellite data

基于HY-1C/D(CZI)卫星遥感影像数据,利用归一化植被指数阈值判别方法提取大型藻类(浒苔绿潮)的分布和覆盖信息;结合实地考察,分析大型藻类的藻类构成与光谱信息特征;获取大型藻类灾害暴发时间、空间分布、密集度、漂移路径并对其分析。结果表明:2021年黄海海域大型藻类灾害最早发生于5月上旬,5月中旬-6月上旬进入发展期,6月中旬-7月上旬进入暴发期,7月中旬—8月下旬进入消亡期。从大型藻类的持续时间、时空分布、密集度变化等指标看,2021年黄海大型藻类分布面积和覆盖面积较大,发生时间较长,结束时间较晚。

Based on HY-1C/D(CZI)satellite remote sensing data,normalized vegetation index threshold iscrimination method is used to extract the distribution and coverage information of macroalgae(Enteromorpha prolifera).The composition and spectral information characteristics of macroalgae are analyzed combined with field investigation.The occurrence time,spatial distribution,density and drift path of large algae disaster are obtained and analyzed.The results show that large-scale algae disaster in the Yellow Sea area in 2021 occurs in early May,develops between middle May and early June,blooms between middle June and early July,and perishes between middle July and late August.According to the duration,spatial and temporal distribution,and concentration changes of macroalgae,the distribution and coverage areas of macroalgae in the Yellow Sea in 2021 are relatively larger,the occurrence time is relatively longer,and the end time is relatively later.