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

HUANG Miao-fen; SONG Qing-jun; MAO Zhi-hua; XING Xu-feng; BAI Zhen-ai; GU Ping; ZHAO Zu-long

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Article Navigation > Haiyang Xuebao > 2011 > 33(3): 47-54

HUANG Miao-fen, SONG Qing-jun, MAO Zhi-hua, XING Xu-feng, BAI Zhen-ai, GU Ping, ZHAO Zu-long. The retrieval model for COD in waters using optical absorption properties of CDOM a case study at the Shuangtaizi River and the Liaodong Gulf[J]. Haiyang Xuebao, 2011, 33(3): 47-54.

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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

Received Date: 2010-09-12

Abstract

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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References(23)

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