基于Forel-Ule指数的鄱阳湖水色时空变化研究

Spatial and Temporal Variation of Water Colour in Poyang Lake based on Forel-Ule Index

基于多光谱传感器数据计算的FUI水体颜色指数模型可用于监测水体颜色变化,从而得知水体水质状况。基于水体颜色指数模型,分析了鄱阳湖2013—2021年水色时空变化特征,并探讨其变化原因。结果表明:鄱阳湖水色指数呈现出逐步降低的趋势,且丰水期鄱阳湖的水色指数均低于枯水期。丰水期和枯水期的水色指数变化趋势均是显著增加转变为显著减小。空间上,南部和西部湖区水色指数较高,东部、北部湖区较低。另外,输沙量对鄱阳湖水色指数有一定的影响。

The FUI water colour index model calculated based on multispectral sensor data can be used to monitor the colour change of water bodies to know the water quality condition.Therefore,this study analysed the spatial and temporal characteristics of water colour changes in Poyang Lake from 2013 to 2021 based on the water body colour index model,and explored the reasons for the changes.The resulted show that the water colour index of Poyang Lake showed a gradually decreasing trend,and the water colour index of Poyang Lake in the abundant water period was lower than that in the dry water period.The trend of the water colour index changed from significantly increasing to significantly decreasing in both abundant and dry water periods.Spatially,the water colour index was higher in the southern and western lakes and lower in the eastern and northern lakes.In addition,