Extraction method for diffuse attenuation coefficient based on airborne LiDAR bathymetric water column waveform

Qi Chao; Zhou Fengnian; Wu Jingwen; Su Dianpeng; Wang Xiankun; Yang Fanlin

doi:10.12284/hyxb2021005

Volume 43 Issue 1

Feb. 2021

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Qi Chao，Zhou Fengnian，Wu Jingwen, et al. Extraction method for diffuse attenuation coefficient based on airborne LiDAR bathymetric water column waveform [J]. Haiyang Xuebao，2021, 43(1)：147–154 doi: 10.12284/hyxb2021005

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Extraction method for diffuse attenuation coefficient based on airborne LiDAR bathymetric water column waveform

doi: 10.12284/hyxb2021005

Qi Chao^{1, 2
,},
Zhou Fengnian³,
Wu Jingwen³,
Su Dianpeng^{1, 2},
Wang Xiankun^{1, 2},
Yang Fanlin^{1, 2
,
,}

1.
College of Geodesy and Geomatics, Shandong University of Science and Technology, Qingdao 266590, China
2.
Key Laboratory of Oceanic Surveying and Mapping, Ministry of Natural Resources, Qingdao 266590, China
3.
The Survey Bureau of the Hydrology and Water Resources of Changjiang Estuary, Changjiang Water Resources Commission, Shanghai 200136, China

Received Date: 2019-10-14
Rev Recd Date: 2020-06-28

Available Online: 2020-12-30

Publish Date: 2021-01-25

Abstract

Abstract

The diffuse attenuation coefficient (K_d) is an important marine optical parameter, which can provide the basic data for the water environment change, the water quality analysis and the aquaculture. There are some limitations of the traditional methods, such as the low efficiency and resolution of the traditional shipborne field measurement and the rough inversion accuracy and spatial resolution of the satellite remote sensing. Therefore, an extraction method for diffuse attenuation coefficient based on airborne LiDAR bathymetric water column waveform is proposed in this paper. Firstly, the water column contribution is decomposed by the waveform decomposition algorithm for airborne LiDAR bathymetry based on the layered heterogeneous model. Then, according to the attenuation characteristics of laser in water, the diffuse attenuation coefficient extraction model is constructed. Finally, the diffuse attenuation coefficient spatial distribution in a large area of water is obtained. The performance of the proposed method was verified by the measured data from the Ganquan Island in the Xisha Archipelago and the Lianyungang’s seacoast. The experimental results demonstrated that the proposed method could obtain the diffuse attenuation coefficient without the water bottom contribution intensity and depth information for each bathymetric point. And the good results were also achieved in turbid waters. Meanwhile, the proposed method showed the feasibility of employing the ALB system to obtain the high-precision diffuse attenuation coefficient in China coastal waters.
- airborne LiDAR bathymetry,
- waveform decomposition,
- diffuse attenuation coefficient,
- water column contribution

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References(25)

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