三峡小江回水区水体光学特征及分析  

Optical properties of water body in Xiaojiang River backwater area,Three Gorges Reservoir

作　　者：方芳[1] 周红[1] 李哲[1] 郭劲松[1] 陈永柏[2] 孙志禹[2] 

机构地区：[1]重庆大学城市建设与环境工程学院,重庆400045 [2]中国长江三峡工程开发总公司,湖北宜昌443002

出　　处：《重庆大学学报（自然科学版）》2011年第9期102-108,共7页Journal of Chongqing University

基　　金：国家水专项资助项目(2009ZX07104-002:2009ZX07104-003);国家科技支撑计划资助项目(2008BAD98B04)

摘　　要：为探讨三峡水库运行初期小江回水区水体的光学特性,研究了2008年1月至12月期间小江回水区5个断面可见光衰减系数Kd(PAR)与透明度的时空分布特征及二者的相关性,进一步分析了可见光衰减系数与透明度、悬浮物浓度、溶解性有机物及叶绿素等水质指标的相关关系。研究区域可见光衰减系数和透明度空间分布差异不明显,但季节变化显著。可见光衰减系数在0.23～4.82m-1之间变化,均值为(1.03±0.07)m-1,冬季最高,夏季最低。统计分析表明,可见光衰减系数与透明度有显著的相关性(R2=0.7791),表明两者可相互反演。与总颗粒态物质浓度,总无机颗粒态物质浓度的相关性显著(R2=0.728 5,R2=0.763 7),与溶解性有机碳有一定的相关性(R2=0.128 9),与叶绿素a相关性不明显(R2=0.006),分析表明总无机颗粒态物质是小江回水区水体光学特征的最主要影响因素。To discuss the optical properties of water body in Xiaojiang river backwater area for the early impounding stage of the Three Gorges Reservoir（TGR）,the spatiotemporal variations of visible light attenuation coefficients（Kd） and Secchi Disc transparency（SD） are investigated during the period from January,2008 to December,2008.The correlations between Kd and SD,total particulate matters（TPM）,dissolved organic carbon（DOC） and chlorophyll-a（Chla） are also analyzed according to the monitoring data.In the study area,there are no significant spatial variations in the mean Kd at five sampling stations,but the seasonal variations are obvious with the highest value of Kd in the winter and the lowest value in the summer.The range of Kd is 0.23～4.82 m-1,and the mean value is（1.03±0.07） m-1.Statistics analysis suggests that there are remarkable correlations between Kd and SD,TPM,TIM as revealed by the coefficient of determination R2=0.779 1,R2 =0.728 5 and R2=0.763 7,respectively.The relationship between Kd and DOC is less significant as shown by the low value of R2=0.128 9.However,the correlation between Kd and Chla is weak which can be seen from the value of R2=0.006.The analysis suggests that total inorganic particulate matters largely influenced the optical properties of water body in Xiaojiang river backwater area.

关 键 词：三峡水库 小江回水区 可见光衰减系数 透明度 总颗粒态物质 

分 类 号：X143[环境科学与工程—环境科学]