Application research of laser-induced fluorescence technique for water quality monitoring
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摘要: 激光诱导荧光(LIF)遥测是针对大面积水域富营养化状况进行原位、实时、快速测量的一种先进的监测技术。利用自行研制的水体污染LIF遥测系统对太湖水域进行了一次较为全面的测量,以测得的溶解有机物(DOM)荧光因子、瑞利散射因子和叶绿素a荧光因子分别代表各测量点的DOM浓度、浊度和叶绿素a浓度。同时以Skalar三维荧光成像仪测量各点DOM浓度,多参数水质分析仪测量浊度和叶绿素a浓度。对比分析了LIF遥测系统测量DOM荧光因子、瑞利散射因子和叶绿素a荧光因子与DOM浓度、浊度和叶绿素a浓度关系。结果表明LIF系统测得的DOM因子与三维荧光成像仪测量的DOM浓度值一致性较好(R=0.88733),而瑞利散射因子和叶绿素a荧光因子与多参数水质测量仪测得浊度值和叶绿素a浓度值线性相关性较差,相关系数分别为-0.39185和0.4552。对上述差异产生的可能原因进行了讨论,并阐述了LIF遥测技术在水质监测中的应用前景和潜在的应用限制。Abstract: Technique of laser induced fluorescence(LIF)remote sensing can be used in water quality monitoring for large water area.A detail water quality investigation for Taihu lake is conducted with the LIF remote sensing system.According to the principle of LIF remote sensing for water quality,the dissolved organic matter(DOM)fluorescence factor,the Rayleigh scattering factor and the chlorophyll-a fluorescence factor correspond to DOM concentration,the turbidity and the chlorophyll-a concentration respectively.The concentrations of DOM are determined by three dimension fluorescence imager,and the turbidity and the chlorophyll-a concentrations are determined by YSI multi-parameter water quality meter.The results of LIF remote sensing system,three dimension fluorescence imager and multi-parameter water quality meter are compared,which indicates that DOM fluo-rescence factors determined by LIF remote sensing system and DOM concentrations determined by three dimension fluorescence agree very well(R=0.88733).However,the Rayleigh scattering factors and the chlorophyll-a fluorescence factors determined by LIF remote sensing system do not agree with the turbidity and the chlorophyll-a concentrations determined by YSI multi-parameter water quality meter,respectively.The linear relative coefficient are -0.39185 and 0.4552,and the causes are discussed.The application potential and the probable limits of LIF remote sensing in the water quality are expatiated further.
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Keywords:
- laser-induced fluorescence /
- DOM /
- Taihu lake /
- Turbidity /
- Chlorophyll-a /
- water quality monitoring
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