摘要
在同步历史实测数据较为缺乏的条件下,基于波谱特征的比值法可以有效进行水体叶绿素a(Chla)和悬浮颗粒物(Tss)浓度的反演。利用不同时期的Landsat遥感卫星影像对九龙江下游河段的叶绿素a和悬浮颗粒物浓度进行了年际变化分析及季节变化分析发现:较高的叶绿素a浓度主要出现在北溪浦南段(北8北9)以及石龟头至北11段,叶绿素a在枯水期呈现浓度增大的趋势;高悬浮颗粒物浓度较易出现在龙津溪入口(北9郭坑公路桥)河段,高悬浮颗粒物浓度季节主要发生在丰水季节。
The ratio method based on image spectrum can be used to reveal the spatial and temporal variations of water quality efficiently, especially for Chlorophyll-a (Chla) and total suspended sediment (Tss) when lack of historical concurrent in situ data. In this study, the spatiotemporal variations during a long period of time and different seasons were detected by Landsat TM. The results indicate that high Chla concentration often appears in Punan reach (station N8-N9), Shiguitou and Jiangdong reservoir. The concentrations of Chla are higher in low water season. In the same way, the concentrations of Tss are analyzed. The result also indicate that high Tss concentrations often appear in Longjin entrance(Station N9-Guokeng)and in flood seasons.
出处
《地理空间信息》
2012年第4期36-39,180,共4页
Geospatial Information
基金
国家自然科学基金资助项目(40810069004)
关键词
遥感
叶绿素A
悬浮颗粒物
水质
九龙江
Remote Sensing,Chlorophyll-a,total suspended sediment,water quality,Jiulong River
