Remote-sensing inversion model of surface water suspended sediment concentration based on in situ measured spectrum in Hangzhou Bay, China
Remote-sensing inversion model of surface water suspended sediment concentration based on in situ measured spectrum in Hangzhou Bay, China
复制标题
基于实测光谱的杭州湾地表水悬浮沙浓度遥感反演模型
DOI：
10.1007/s12665-012-1608-0
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发表时间：
2012-02
影响因子：
2.8
通讯作者：
Zhao, Keli3
中科院分区：
文献类型：
--
作者：
Wang, Fan1;Zhou, Bin1;Liu, Xingmei2;Zhou, Gendi1;Zhao, Keli3
悬浮泥沙浓度（SSC）是监测近岸水质的重要参数。悬浮颗粒也是海洋颜色遥感的主要光学活性物质。研究近岸浑水表面反射光谱特征具有重要意义，可以为建立更精确的遥感反演模型奠定基础。本研究选择中国杭州湾作为研究区域。在流入杭州湾的钱塘江河口分别设立了2个原位测量采样站。采用美国宇航局推荐的水面光谱观测方法来测量浑浊水域的反射光谱。同时采集地表水样品以获得相应的SSC数据。结果表明，杭州湾总悬浮颗粒浓度普遍较高，其中无机悬浮颗粒浓度远大于浮游植物浓度，平均值分别为705 mg/L和1.16 mg/m3。两个采样站的SSC均表现出显着的时间变化，特别是伴随潮汐周期出现短周期快速波动。测得的地表水反射率光谱均呈现出典型的高浊度水体曲线特征，并且随着SSC的增加，地表水相应的反射率也随之增加。不同波长下的增量是变化的，两个反射峰分别出现在光谱曲线的650-700 nm和800 nm波长附近。光谱曲线的一阶导数表明，随着SSC的增加，第一反射峰位置出现“红移”现象。地表水的SSC与中分辨率成像光谱辐射计（MODIS）通道中心波长的遥感反射率之间的相关系数存在显着差异，MODIS长波长通道（>650 nm）的相关系数较大，MODIS短波长通道（400-550 nm）的相关系数较小。选择MODIS波段2与波段1的反射率比作为SSC敏感波段组合并进行指数回归分析时，判定系数R2值为0.82。因此，可以采用MODIS波段2与波段1的反射率比作为建立杭州湾地表水SSC遥感反演模型的主要波段组合。
Suspended sediment concentration (SSC) is an important parameter for monitoring coastal water quality. Suspended particles are also the main optically active substances for ocean color remote sensing. It is important to study the surface reflectance spectra features of coastal turbid water, as it can be the basis for establishing more accurate remote-sensing inversion models. In this study, Hangzhou Bay, China, was selected as the study area. Two in situ measurement and sampling stations in the estuary of the Qiantang River which flows into Hangzhou Bay were set up separately. Above-water spectrum observation method, which the NASA recommended, was adopted to measure the reflection spectrum of turbid waters. Surface water samples were simultaneously collected to obtain the corresponding SSC data. The results showed that the total suspended particle concentrations in the Hangzhou Bay were typically high, and the inorganic suspended particle concentrations were far greater than the phytoplankton concentrations, which averages 705 mg/L and 1.16 mg/m3. The SSC at two sampling stations both showed significant temporal variability, particularly appearing short-period rapid fluctuations accompanying the tidal cycle. The measured surface water reflectance spectra all showed typical curve characteristics of high turbid water, and as the SSC increased, the corresponding reflectivity of surface water also increased. The increments at different wavelengths were variational, with two reflectance peaks appearing at 650–700-nm and near the 800-nm wavelength of spectral curves, respectively. The first derivative of spectral curves showed that the first reflectance peak location appeared to be a “red shift” phenomenon with the SSC increasing. The correlation coefficients between the SSC of surface water and the remote-sensing reflectance according to moderate resolution imaging spectra-radiometer (MODIS) channels’ central wavelength were different significantly, which were larger at MODIS long-wavelength channels (>650 nm) and smaller at MODIS short-wavelength channels (400–550 nm). The value of determination coefficientR2was 0.82 when the reflectance ratio of MODIS band 2 to band 1 was selected as the SSC sensitive bands combination and exponential regression analysis was employed. Therefore, the reflectance ratio of MODIS band 2 to band 1 can be adopted as the main band combination for establishing surface water SSC remote-sensing inversion model in the Hangzhou Bay.
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影响因子：
--
作者：
P. Curran;E. Novo
通讯作者：
P. Curran;E. Novo
影响因子：
3.4
作者：
J. Warrick;L. Mertes;D. Siegel;C. Mackenzie
通讯作者：
J. Warrick;L. Mertes;D. Siegel;C. Mackenzie
DOI：
--
发表时间：
2000
期刊：
--
影响因子：
--
作者：
G. Fargion;J. Mueller
通讯作者：
G. Fargion;J. Mueller
DOI：
10.1016/s0278-4343(97)00074-5
发表时间：
1998-05
期刊：
--
影响因子：
--
作者：
Yan Li;Wei Huang;Ming Fang
通讯作者：
Yan Li;Wei Huang;Ming Fang
影响因子：
1.9
作者：
Mobley, CD
通讯作者：
Mobley, CD