| 引用本文: | 徐纬凡,李云梅,王桥,吕恒,刘忠华,徐昕,檀静,郭宇龙,吴传庆.三峡水库水体漫衰减系数光学特性及其遥感反演.湖泊科学,2011,23(1):95-103. DOI:10.18307/2011.0115 |
| XU Yifan,LI Yunmei,WANG Qiao,LV Heng,LIU Zhonghua,XU Xin,TAN Jing,GUO Yulong,WU Chuanqing.Optical properties and retrieving of diffuse attenuation coefficient of the Three Gorges Reservoir by remote sensing. J. Lake Sci.2011,23(1):95-103. DOI:10.18307/2011.0115 |
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| 三峡水库水体漫衰减系数光学特性及其遥感反演 |
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徐纬凡1, 李云梅1, 王桥2, 吕恒1, 刘忠华1, 徐昕1, 檀静1, 郭宇龙1, 吴传庆2
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1.南京师范大学虚拟地理环境教育部重点实验室, 南京 210046;2.环境保护部卫星环境应用中心, 北京 100029
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| 摘要: |
| 根据2009年8月22-24日实测的三峡水库水体的光谱数据以及水质参数, 对三峡水库漫衰减系数的光学特性及影响因子进行分析研究, 构建了490nm处漫衰减系数的Kd(490)反演模型, 并利用环境一号卫星CCD数据对2009年7月21日的三峡水库Kd(490)进行反演.结果表明:由于水体中非色素颗粒物的含量较高, 使得研究区大部分点位的Kd值在440nm和675nm处的衰减峰值不明显, 对Kd占主导地位的影响因子是颗粒物的吸收作用以及水体的总散射作用, 在所选的四个特征波段(440、550、613和675nm)处, 其贡献率的均值分别为45.48%和38.21%;在400-700nm波段范围, Kd与非色素颗粒物浓度具有很好的幂函数关系.利用地面实测遥感反射率模拟环境卫星第三波段构建Kd(490)反演模型, 其平均相对误差为17.89%, 直接利用卫星数据反演的相对误差为28.38%;研究区中Kd(490)主要集中在6-7m-1, 占研究区域面积的83.60%, 相比而言, 入库支流的Kd(490)较干流要低, 表明支流颗粒物含量相对较低。 |
| 关键词: 漫衰减系数 三峡水库 环境一号卫星 遥感反射率 |
| DOI：10.18307/2011.0115 |
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| 基金项目:国家科技重大专项项目(2009ZX07527-006)、国家自然科学基金顼目(40971215)、江苏省普通高校研究生科研创新计划项目(CX09B-301Z)、南京师范大学优秀博士论文培养计划项目(12432116011036)、江苏省普通高校研究生科研创新计划项目(CX10B_392Z)和南京师范大学优秀博士论文培育计划项目(2010bs0036)联合资助 |
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| Optical properties and retrieving of diffuse attenuation coefficient of the Three Gorges Reservoir by remote sensing |
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XU Yifan1, LI Yunmei1, WANG Qiao2, LV Heng1, LIU Zhonghua1, XU Xin1, TAN Jing1, GUO Yulong1, WU Chuanqing2
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1.Key Laboratory of Virtual Geographic Environment, Ministry of Education, Nanjing Normal University, Nanjing 210046, P.R.China;2.Satellite Environment Application Center, Ministry of Environmental Protection, Beijing 100029, P.R.China
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| Abstract: |
| By using the in situ measured data of spectral reflectance and water quality parameters in Aug.22-24, 2009, this study analyzed the spectral characteristics and affecting factors of diffuse attenuation coefficient(Kd) of the Three Gorges Reservoir, and built a retrieving model of Kd(490)at band 490nm.In addition, Kd(490)was inversed by using CCD image of HJ-1 satellite in July 21, 2009.The results showed that the attenuation peaks were not distinct at bands 440nm and 675nm owing to the high content of non-pigment particulates in the water.The dominant affecting factors were absorption of particulates and total scattering water body, while average contributions of the four bands(i.e.440, 550, 613 and 675nm) were 45.48% and 38.21%, respectively;Kd strongly power correlated with the concentration of non-pigment particles between 400 to 700nm.Besides, the average relative error of inversed vs.measured Kd(490) was 17.89% for ground-measured Rts, whereas the relative error for images data was 28.38%;Kd(490)of the study area was concentrated from 6 to 7m-1, which accounted for 83.60% of the study area.Additionally, Kd(490)of the tributaries of the reservoir was lower than the main stream, which indicated that the content of particulates in tributaries was relatively low. |
| Key words: Diffuse attenuation coefficient Three Gorges Reservoir HJ-1 satellite remote sensing reflectance |
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