南水北调调蓄湖泊水质参数遥感反演及其影响因素

基于Landsat与HJ1A/1B多源遥感数据、实测水质数据、光谱数据，利用悬浮颗粒物(SPM)、叶绿素a(Chl-a)质量浓度与水体光学特性之间的关系构建反演模型，模拟SPM、Chl-a质量浓度的时空演变规律及其影响因素。结果表明:1985—2015年，随着南水北调工程的实施，东平湖春季SPM与Chl-a质量浓度变化呈现3个阶段显著变化的特点，且SPM与Chl-a质量浓度总体上呈现负相关趋势，SPM质量浓度较高区域的负相关趋势尤为显著，相关系数最高达-0.86；调水过程中，径流导致的底质再悬浮使得SPM质量浓度增高，而调水注入的稀释作用使得Chl-a质量浓度降低；第一、二阶段SPM与Chl-a质量浓度分布规律主要受大汶河流域污染、围网养殖等综合因素影响，第三阶段主要受水体流速、流向等调水期水动力因素影响。

Remote sensing inversion of water quality parameters and its influencing factors in a storage lake of South-to-North Water Diversion Project

Based on Landsat and HJ1A /1B remote sensing data, measured water quality data, and spectral data, using the relationship between suspended particulate materials(SPM), chlorophyll-a(Chl-a)concentrations and optical properties of water, an inversion model was established. The spatiotemporal evolution of SPM and Chl-a mass concentrations and their influencing factors were simulated. The results showed that with the implementation of the south to North Water Diversion Project, the changes of SPM and Chl-a mass concentrations in Dongping Lake in spring showed three significant stages from 1985 to 2015. The correlation between SPM and Chl-a mass concentrations was negative in general, especially in the high SPM concentration area, with the highest correlation coefficient of -0.86. In the process of water diversion, the sediment resuspension caused by runoff increases the mass concentration of SPM, while the dilution effect of water diversion injection decreases the mass concentration of Chl-a. The distribution of SPM and Chl-a mass concentrations in the first and second stages was mainly affected by pollution and purse seine culture in the Dawen River Basin. The third stage was mainly affected by the flow velocity, flow direction and other hydrodynamic factors.