珠江口河网水体非光学活性水质参数高光谱反演

doi:10.11978/2020013

热带海洋学报 ›› 2021, Vol. 40 ›› Issue (1): 58-64.doi: 10.11978/2020013CSTR: 32234.14.2020013

珠江口河网水体非光学活性水质参数高光谱反演

蔡建楠^1,²(), 刘海龙³, 姜波³, 陈吟晖^1,², 李杰鸿^1,², 吴思晓², 梁建霞², 黄华⁴, 邢前国³()

1.中山市环境监测站, 广东中山 528403
2.中山市生态环境局, 广东中山 528403
3.中国科学院烟台海岸带研究所, 中国科学院海岸带环境过程与生态修复重点实验室, 山东烟台 264003
4.广东环境保护工程职业学院, 广东省无人机环保应用工程技术研究中心, 广东佛山 528216

收稿日期:2020-02-03 修回日期:2020-04-18 出版日期:2021-01-10 发布日期:2020-04-24
通讯作者: 邢前国
作者简介:蔡建楠(1982—), 男, 广东省潮州市人, 硕士, 高级工程师, 主要从事环境监测遥感应用研究。email: jncai@foxmail.com
基金资助:
中国科学院科研装备研制项目(YJKYYQ20170048);国家自然科学基金项目(41676171);广东省科技创新战略专项(PDJH2020b1091)

Retrieval of non-optically active water quality parameters by hyperspectra for river network waters in the Pearl River estuary

CAI Jiannan^1,²(), LIU Hailong³, JIANG Bo³, CHEN Yinhui^1,², LI Jiehong^1,², WU Sixiao², LIANG Jianxia², HUANG Hua⁴, XING Qianguo³()

1. Zhongshan Environmental Monitoring Station, Zhongshan 528403, China
2. Zhongshan Environmental Protection Agency, Zhongshan 528403, China
3. Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China
4. Guangdong Polytechnic of Environmental Protection Engineering, Guangdong Engineering Technology Research Center for UAV Environmental Application, Foshan 528216, China

Received:2020-02-03 Revised:2020-04-18 Online:2021-01-10 Published:2020-04-24
Contact: XING Qianguo
Supported by:
Instrument Developing Project of the Chinese Academy of Sciences(YJKYYQ20170048);National Natural Science Foundation of China(41676171);Science and Technology Innovation Strategy Project of Guangdong Province(PDJH2020b1091)

摘要/Abstract

摘要：

以粤港澳大湾区中山市及其邻近水域河网水体为试验区, 同步采集现场光谱及水质数据, 研究受测水体的高光谱反射率特征, 并分析非光学活性参数中化学需氧量(COD_Cr)、总磷(TP)浓度与高光谱反射率的相关性。结果显示, 各河流水体光谱反射率主要受悬浮颗粒物和叶绿素a的影响; 在500~680nm波段范围内, 水体光谱反射率大小与COD_Cr、TP浓度呈负相关关系; 与单波段相比, 特定波段的反射率比值与COD_Cr、TP浓度值的相关性较高, 与COD_Cr、TP浓度值相关性最高的反射率比值波段组合分别为R₆₇₅/R₇₉₄、R₆₉₀/R₈₁₅。选择上述波段组合建立的水质反演模型具有良好的估算精度, 模型估算平均相对误差分别为27.2%、32.1%, 表明高光谱技术在珠江口河网水体非光学活性参数COD_Cr、TP浓度反演上具有较大的应用潜景。

关键词: 珠江口河网, 非光学活性参数, 高光谱, 水质反演, 波段比值

Abstract:

Field spectra and water quality measurements were performed in Zhongshan City and its adjacent river network in the Guangdong-Hong Kong-Macao Greater Bay Area. The hyperspectral reflectance characteristic of the river network and its correlation with the concentration of two non-optical activity parameters Chemical Oxygen Demand (COD_Cr) and Total Phosphorus (TP) were analyzed. The results showed that the spectral reflectance of the river network was mainly affected by suspended particulate matter and chlorophyll-a. In the range of 500~680 nm, the spectral reflectance of the water had negative correlations with the concentrations of COD_Cr and TP. Compared with the single band, the reflectance ratio of the specific band had higher correlations with COD_Cr and TP concentrations. The reflectance ratio band combinations with the highest correlations with COD_Cr and TP concentrations are R₆₇₅/R₇₉₄ and R₆₉₀/R₈₁₅, respectively. The water quality retrieval models that depend on the band combination show good estimation accuracy, with 27.2% and 32.1% of the average relative errors, indicating that the hyperspectral technology has good potential application for non-optical activity parameters (COD_Cr and TP) retrieval in the river network of the Pearl River estuary.

Key words: river network of Pearl River estuary, non-optically active water quality parameter, hyperspectra, water quality retrieval, band ratio

中图分类号:

P733.31

蔡建楠, 刘海龙, 姜波, 陈吟晖, 李杰鸿, 吴思晓, 梁建霞, 黄华, 邢前国. 珠江口河网水体非光学活性水质参数高光谱反演[J]. 热带海洋学报, 2021, 40(1): 58-64.

CAI Jiannan, LIU Hailong, JIANG Bo, CHEN Yinhui, LI Jiehong, WU Sixiao, LIANG Jianxia, HUANG Hua, XING Qianguo. Retrieval of non-optically active water quality parameters by hyperspectra for river network waters in the Pearl River estuary[J]. Journal of Tropical Oceanography, 2021, 40(1): 58-64.

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水质指标	最小浓度值/(mg·L^-1)	最大浓度值/(mg·L^-1)	平均浓度值/(mg·L^-1)	标准差/(mg·L^-1)
COD_Cr	5	72	15	9
TP	0.04	0.95	0.18	0.12

水质指标	波段组合	拟合方式	回归模型方程	R²	RMSE
COD_Cr	R₆₇₅/ R₇₉₄	线性拟合	y=-10.4x+33.85	0.332	8.641
		指数拟合	y=104.6e^-1.239^x	0.563	6.991
		幂函数拟合	y=23.59x^-1.135	0.661	6.159
TP	R₆₉₀/ R₈₁₅	线性拟合	y=-0.143x+0.4331	0.301	0.109
		指数拟合	y=1.353e^-1.227^x	0.467	0.096
		幂函数拟合	y=0.3629x^-1.596	0.569	0.086

水质指标	绝对误差最大值/(mg·L^-1)	绝对误差最小值/(mg·L^-1)	平均相对误差/%
COD_Cr	8.607	0.435	27.2
TP	0.121	0.002	32.1

珠江口河网水体非光学活性水质参数高光谱反演

Retrieval of non-optically active water quality parameters by hyperspectra for river network waters in the Pearl River estuary

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