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

Abstract

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

CLC Number:

P733.31

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

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

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