东平湖CDOM的光谱吸收特征及环境指示意义

发布时间：2018-05-23 22:50

本文选题：东平湖 + CDOM　；参考：《光谱学与光谱分析》2016年10期

【摘要】：随着南水北调东线工程的开通,东平湖作为山东段的两大调蓄湖泊之一,其水质的有效监测和污染预警显得尤为重要。根据东平湖夏季有色可溶性有机物(CDOM)吸收系数的空间分布特征和CDOM光学参数,探讨了CDOM吸收系数与溶解性有机碳(DOC)、叶绿素(Chla)等水质指标之间的关系,以期为今后建立水源水质突变的实时监控和污染事件预警系统提供依据。结果表明,东平湖属于中-富营养型湖泊,CDOM吸收系数(a(280),a(350),a(440))均值分别为(12.90±1.17),(3.11±0.40)和(0.65±0.09)m-1,在一定程度上反映了湖泊的营养状况。东平湖内CDOM浓度整体呈现出从东岸河口区向湖心区、西南岸递减的趋势,体现了河流陆源输入对东平湖CDOM的重要贡献。东平湖水体的CDOM浓度(如a(440))可以用来估算反演常规水质参数,但仍需要进一步对不同季节不同水域CDOM的物质构成进行深入分析和研究。由吸收特征值S值、E3/E4、M值得出,东平湖河口区输入的陆源CDOM进入湖泊后,随着陆源输入的比例下降CDOM腐殖化程度降低,富里酸的相对含量升高,且相对分子质量也逐渐减小。
[Abstract]:With the opening of the East Route of South-to-North Water transfer Project, Dongping Lake, as one of the two major regulating lakes in Shandong, is particularly important for its effective water quality monitoring and pollution warning. Based on the spatial distribution and CDOM optical parameters of color soluble organic matter (CDOM) absorption coefficient in Dongping Lake in summer, the relationship between CDOM absorption coefficient and water quality indexes, such as dissolved organic carbon (DOC), chlorophyll Chla, etc., was discussed. It is expected to provide basis for the establishment of real-time monitoring and pollution incident early warning system for water quality catastrophe in the future. The results show that the average values of CDOM absorption coefficient of Dongping Lake are 12.90 卤1.17 (3.11 卤0.40) and 0.65 卤0.09m ~ (-1), respectively, reflecting the nutrient status of the lake to some extent. The concentration of CDOM in Dongping Lake shows a decreasing trend from the estuary to the center of the lake and the southwest coast, which reflects the important contribution of the terrestrial input of the river to the CDOM of the Dongping Lake. The CDOM concentration in Dongping Lake can be used to estimate and retrieve the conventional water quality parameters, but it is still necessary to further analyze and study the material composition of CDOM in different seasons and different waters. According to the absorption eigenvalue S / E _ 3 / E _ 4N _ M, it is concluded that when the input CDOM from the Dongping Lake estuary enters the lake, the degree of CDOM humification decreases, the relative content of fulvic acid increases, and the relative molecular weight decreases with the proportion of the terrestrial source input decreasing.
【作者单位】：聊城大学环境与规划学院;中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室;太湖流域水文水资源监测中心水利部太湖流域管理局;
【基金】：国家自然科学基金项目(41301544;41230744) 中国博士后科研基金项目(2015M571831) 山东省自然科学基金项目(ZR2012DQ003,ZR2013DL003) 国家大学生创新创业训练计划项目(201510447015)资助
【分类号】：X524

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