联合多源光学和雷达遥感的巢湖水华长时序时空变化分析

以巢湖水华爆发现象为研究对象,利用多源光学遥感和全极化SAR遥感作为数据源,对研究区域2008—2017年的水华进行识别提取,定量和定性分析水华面积及区域位置的时空变化。结果表明:在时间上,每年二、三季度巢湖水华面积普遍高于一、四季度,总体上呈现年平均水华面积逐渐减小趋势,前五年的水华面积比后五年高。在空间上,巢湖西北部水华发生频率最高,西部水华比东部水华发生频率高,沿岸比湖中心发生频率高。巢湖水华整体呈现改善趋势。

Long Time Sequence Temporal and Spatial Variation Analysis of Algal Blooms in Chaohu Lake Based on Multi source Optical and Radar Remote Sensing

The algal blooms in Chaohu Lake was identified and extracted using multi source optical remote sensing and full polarization SAR remote sensing as the data source from 2008 to 2017. The temporal and spatial variation of the algal blooms area and location were quantitatively and qualitatively analyzed. Results showed that, in time, the algal blooms area in the second and third quarters each year was generally larger than that in the first and fourth quarters. The annual average of algal blooms area had a general trend of decreasing, the algal blooms area in the first five years was larger than that in the last five years. In space, the frequency of algal blooms in the northwest of Chaohu Lake was the highest, it was higher in the west that in the east, and was higher along the lakeshore than in the center. The algal blooms in Chaohu Lake showed an overall improvement.