应用CDOM光学特性估算水体COD--以辽宁省盘锦市双台子河和辽东湾为例

黄妙芬; 宋庆君; 毛志华; 邢旭峰; 白贞爱; 古平; 赵祖龙

应用CDOM光学特性估算水体COD--以辽宁省盘锦市双台子河和辽东湾为例

1.
大连海洋大学海洋工程学院,辽宁大连 116023
2.
国家海洋局国家卫星海洋应用中心,北京 100081
3.
国家海洋局第二海洋研究所,浙江杭州 310012
4.
辽河油田安全环保处,辽宁盘锦 124010

基金项目: 国家海洋局公益项目"海水有机污染物测量仪试验方法研究"(201005025-04);国家自然科学基金项目"水体石油类污染遥感探测机理和识别模型研究"(40771196);"十一五"科技支撑项目"基于环境一号等国产卫星的环境遥感监测关键技术及软件研究"(2008BAC34B05-5)。

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出版历程
- 收稿日期: 2010-09-12

The retrieval model for COD in waters using optical absorption properties of CDOM a case study at the Shuangtaizi River and the Liaodong Gulf

1.
School of Marine Engineering, Dalian Ocean University, Dalian 116023, China
2.
National Satellite Ocean Application Service,State Oceanic Administration, Beijing 100081,China
3.
Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012,China
4.
Department of Quality and Security and Environmental Protection,Liaohe Oil Field, Panjin 124010, China

摘要

摘要: 有色可溶性有机物(chromophoric dissolved organic matter,CDOM)是水体中一类重要的光吸收物质,在水色遥感中,其光学特性主要以440 nm处的吸收系数和光谱斜率来表征,利用这些光学特性进行水环境要素遥感反演具有较广泛的应用前景。化学需氧量(chemical oxygen demand,COD)是指以化学方法(锰法和铬法)测量水样中需被氧化的还原性物质的量,而水体中的还原性物质主要以有机物为主,因此COD是反映水体中有机污染程度的一个重要参数。根据2008年5月和2009年8月在辽宁省盘锦市境内双台子河和入海口获取的CDOM吸收系数和水体表观光谱数据,结合现场COD分析数据,首先对COD与水体CDOM吸收系数进行相关性分析,结果表明有机污染物对水体吸收系数的影响主要体现在黄色物质吸收系数的光谱特性上;其次,确定表征有机污染水体CDOM吸收光谱特性指数模型的光谱斜率S;第三,针对环境一号卫星(HJ-1)/CCD传感器,建立利用其第一波段和第三波段遥感反射比反演表征CDOM浓度在440 nm处的CDOM光吸收系数a_g(440)的模式;第四,建立应用CDOM光学特性估算水体COD的遥感模式;最后将模式应用于辽东湾,获取河流和近岸水体COD空间分布专题图。
- CDOM /
- 光学特性 /
- HJ-1/CCD /
- 化学需氧量COD /
- 遥感模式
Abstract: Chromophoric dissolved organic matter(CDOM) is the pool of absorbing substance for light in water. In the fields of water colour remote sensing, its optical absorption properties are mainly described with an absorption coefficient and a spectral slope. It will be widely used to retrieve water quality parameters with the spectral characteristicl of absorption by yellow substances. Chemical oxygen demand(COD) is an importment parameter to reflect the degree of organic pollution, which is used to show the quantity of oxidant in measuring water samples. The experimental data in-situ including the absorption coefficient of CDOM, apparent optical properties and COD are obtained in the regions of Panjin, Liaoning Province in May 2008 and August 2009. With the measurement data, first, it has showed by correlative coefficients that the influence of COD in water on the spectral absorption coefficient is mainly represented on absorption spectral features of CDOM. Second, the exponential spectral slope was determinged. Thirdly, the model of retrieval a_g(440) based on the HJ-1 satellite is created, which can be as the concentration of CDOM. Then, a remote sensing model was establish based on the exponential spectral slope and the absorption coefficient at 440 nm .Finally, the model for water COD retrieval from HJ-1 satellite was applied in the region of the Liaodong Gulf and the spatial distribution of COD was obtained.
- CDOM /
- optical properties /
- HJ-1/CCD /
- COD /
- retrieval model

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参考文献(23)

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