摘要:
基于遥感和地理信息系统技术,利用MODIS全球地表反射数据,结合浮游藻类指数(floating algae index,FAI)方法,以山东省日照市近海为研究对象,进行浒苔信息识别与提取,分析2012年和2013年浒苔的时空分布特征与发展趋势,并结合海水表面温度(sea surface temperature,SST)和热带测雨卫星(tropical rainfall measuring mission satellite,TRMM)提供的逐月降水资料,揭示气象因子与浒苔之间的关联机制,为控制和治理浒苔提供信息支持.结果表明:运用FAI指数方法能够较好地反演出日照市近海2012年及2013年5-7月海面浒苔分布面积及时空特征;提取的浒苔信息表明,2013年浒苔强度与面积总体上均大于2012年;海水表面温度与月降水量对浒苔的生长爆发有重要影响,浒苔在20℃~21℃之间最易繁殖,降水量的增加为浒苔生长提供了更加有利的条件,2013年5-7月的水文气象条件相对2012年更加有利于浒苔的生长.
Abstract:
Rizhao offshore was selected as the study area in monitoring the Enteromorpha Prolifera.Using the floating algae index (FAI) which is based on the remote sensing technology and geographic information system with MODIS global surface reflectance data,the authors interpreted and extracted the Enteromorpha prolifera information in Rizhao offshore.Temporal and spatial evolution characteristics of 2012 and 2013 were studied through these methods.Combined with the sea surface temperature data and the precipitation provided by TRMM satellite,the relationship between Enteromorpha prolifera and the meteorological factors were revealed.The results can provide information about controlling and alleviating the harm of Enteromorpha prolifera.Some conclusions have been reached:The intensity and distribution areas of Enteromorpha prolifera could be well revealed by using FAI index from May to July in 2012 and 2013.The information about Enteromorpha prolifera by using threshold indicates that the intensity and the areas of Enteromorpha prolifera in 2013 was stronger than that in 2013.Temperature and precipitation have great influence on the thriving of Enteromorpha prolifera.The temperature between 20℃ and 21℃ is the best interval for the growth of Enteromorpha prolifera,and the increasing of precipitation is also important for the increasing of Enteromorpha prolifera.In short,hydrographic and meteorological condition in 2013 was more suitable for thriving of Enteromorpha prolifera than that in 2012.
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