太湖水体散射特性及其空间分异-湖泊科学.PDF

J. Lake Sci.(湖泊科学), 2008, 20(3): 389-395 . E-mail: jlakes@ ©2008 by Journal of Lake Sciences 太湖水体散射特性及其空间分异* 孙德勇, 李云梅, 王 桥, 乐成峰, 黄昌春, 伍 蓝 (南京师范大学教育部虚拟地理环境重点实验室, 南京 210046) 摘 要: 利用 Wetlabs 公司研制的 AC-S 和 BB9 于 2006 年 10 月 24 日至 11 月 2 日对太湖水体的散射系数和后向散射系数进 行了测量, 在此基础上建立了太湖水体散射系数与后向散射系数之间的关系模型. 用 2 种曲线函数模拟, 即在蓝光波段使用 S 形曲线模型, 在绿光和红光波段使用逆函数模型, 各模型的 MAPE 和 RMSE 变化范围分别为 0.027-0.156m-1 、0.005-0.050m-1, 模型整体预测精度都较高 . 研究发现后向散射系数与散射系数的空间分异现象明显, 北部梅梁湾、湖心区、西部及西南部水 域散射较强, 而东太湖、胥口湾等东部水域的散射相对较弱. 关键词: 后向散射系数; 散射系数; 空间分异; 太湖 The scattering characteristics of Lake Taihu waters SUN Deyong, LI Yunmei, WANG Qiao, LE Chengfeng, HUANG Changchun WU Lan (Key Laboratory of Virtual Geographic Environment , Ministry of Education, Nanjing Normal University , Nanjing 210046, P.R.China) Abstract : Based on water inherent optical properties using AC-S and BB9, which were developed by WETlabs Inc, the backscattering and scattering coefficients of Lake Taihu waters had been obtained from Oct. 24th to Nov. 2rd, 2006. Based on data analysis, the models between backscattering coefficients and scattering coefficients had been established. Two kinds of curve functions had been used to simulate, i.e. S curve at blue waveband and inverse function at green and red wavebands. And the change ranges of MAPE and RMSE are 0.027-0.156 m-1 and 0.005-0.050m-1, which indicated higher accuracy. Meanwhile, marked spatial distribution differences of the backscattering and scattering coefficients were found in Lake Taihu. As far as the entire lake was concerned, the scattering and backscattering coefficients in wester lake regions were higher than those in eastern lake regions. Strong scattering and backscattering were found in Meiliang Bay, center region of lake, western and