基于MODIS的2000～2013年巢湖蓝藻水华暴发时空分布特征
Characteristics of Spatial and Temporal Distribution of Blue-green Algae Blooms Outbreak in Chaohu Lake Based on MODIS in 2000-2013
顾长梅 1张运 1钱贞兵 2徐升 2黄晨1
作者信息
- 1. 安徽师范大学国土资源与旅游学院,安徽芜湖 241000;安徽省自然灾害过程与防控研究重点实验室,安徽芜湖 241000
- 2. 安徽省环境监测中心站,安徽合肥 230000
- 折叠
摘要
[目的]研究2000 ～2013年巢湖蓝藻水华暴发时空分布特征,为巢湖流域水环境的综合治理提供决策支持.[方法]利用2000～2013年长时间序列MODIS遥感影像数据计算归一化植被指数,着重分析巢湖蓝藻水华时空分布特征.[结果]巢湖蓝藻水华总体暴发频率较高,以小面积水华为主,大面积水华暴发具有偶然性.2010年起,蓝藻水华暴发频次和程度有增加趋势,其中2010年水华暴发程度最严重.2000 ～2013年巢湖蓝藻水华发生区域呈扩大趋势,发生时间呈延长趋势.4月就开始出现且伴有大面积水华暴发,7、8、10月是蓝藻暴发主要月份,9月份次之,11月明显减少;蓝藻水华先在西北湖区产生,逐渐向东部和中部蔓延,在高峰期覆盖至整个湖心区域,其中湖区南部、东南和东北沿岸是最后新增的水华区域.[结论]2000 ～2013年巢湖蓝藻水华总体暴发频率较高,发生时间呈延长趋势,发生面积呈扩大趋势.
Abstract
[Objective] To research the characteristics of spatial and temporal distribution of blue-green algae blooms outbreak in Chaohu Lake,and to provide policy decision support for the comprehensive control of water environment in Chaohu basin.[Method] A set of MODIS images from 2000 and 2013 were used to calculate the NDVI (Normalized Difference Vegetation Index),in order to figure out the time and spatial distribution of the blue-green algae blooms.[Result] The overall outbreak frequency of blue-green algae blooms was relatively high with a small area of algae bloom as the main factor,and the large area of algae bloom as accidental factor.The frequency and scale of the blooms became higher and lager since 2010,which was the most serious in 2010.From 2000 to 2013,the occurrence of algae bloom was increasing,and the occurrence time was prolonged.The algae bloom began to appear in April within a large area.July,August and October were the major months for outbreak of blue-green algae,followed with September;and November reduced significantly.Blue-green algae blooms always showed up in northwest part of the lake,and spread to eastern and central part of the lake.It could reach the middle of the lake when the blue-green algae was the maximum in quantity.The south,southeast and northeast coasts were finally added to the bloom region.[Conclusion] Blue-green algae blooms outbreak has high frequency in Chaohu Lake in 2000-2013,the occurrence time is prolonged,and the occurrence area showed an enlarging trend.
关键词
巢湖/蓝藻/归一化植被指数/时空分布特征Key words
Chaohu Lake/Blue-green algae/NDVI/Temporal and spatial distribution characteristics引用本文复制引用
基金项目
安徽省环境保护厅科研项目(2012-008)
出版年
2016
国家科技期刊平台
NSTL
维普
万方数据