Inversion and evaluation of water quality parameters based on UAV multispectral data: a case study of Yongzhuang Reservoir in Haikou
ZHANG Le1,2, LEI Jin-rui1,3, CHEN Yi-qing1,3, CHEN Zong-zhu1,3, ZHOU Peng2, HE Rong-xiao2, WU Ting-tian1,3, CHEN Xiao-hua1,3, LI Yuan-ling1,3, PAN Xiao-yan1,3
1. Hainan Academy of Forestry (Hainan Academy of Mangrove), Haikou 571100, China; 2. College of Forestry, Hainan University, Haikou 570228, China; 3. Haikou Wetland Protection Engineering Technology Research and Development Center, Haikou 571100, China
Abstract：The subject of this paper was Yongzhuang Reservoir, a water source reserve in Haikou. Unmanned aerial vehicles (UAVs) equipped with multi-spectral sensors were utilized to obtain spectral reflectance datasets of water bodies, and fitting modeling was performed with corresponding measured data. Based on this, this paper established optimal inversion models for four water quality parameters, namely total phosphorus (TP), total nitrogen (TN), turbidity (TUB), and Chlorophyll a (Chl-a), for the reservoir's dry and rainy seasons, and conducted spatial water quality evaluation. The results indicated that: the polynomial models all presented the highest accuracy for the TP, TN, and Chl-a inversion models of the water bodies in the Yongzhuang Reservoir's dry and rainy seasons, with an R2 greater than 0.5. The accuracy of the TUB inversion model with the polynomial function model was the highest during the dry season, while the accuracy of the linear regression model was the highest during the rainy season. There were notable variations in the spatial distribution of the four water quality parameters in Yongzhuang Reservoir's dry and rainy seasons. In general, the water quality on the west side of the reservoir was good during the dry season, while that on the east side was poor. Additionally, the water quality on the east side of the reservoir was good during the rainy season, while the water quality gradually deteriorated towards the west. It was recommended that sewage intercepting pipelines be strengthened at the urban-rural junction on the reservoir's east side to reduce the direct discharge of imported pollution sources. On the west side of the reservoir, an ecological buffer zone was recommended to be established to intercept agricultural non-point source pollution and reduce the danger of water eutrophication. The findings of this paper could serve as a scientific foundation for the effective monitoring and protection of urban water source reserves.
张乐, 雷金睿, 陈毅青, 陈宗铸, 周鹏, 何荣晓, 吴庭天, 陈小花, 李苑菱, 潘小艳. 基于无人机多光谱数据的水质参数反演与评价——以海口市永庄水库为例[J]. 中国环境科学, 2023, 43(S1): 258-267.
ZHANG Le, LEI Jin-rui, CHEN Yi-qing, CHEN Zong-zhu, ZHOU Peng, HE Rong-xiao, WU Ting-tian, CHEN Xiao-hua, LI Yuan-ling, PAN Xiao-yan. Inversion and evaluation of water quality parameters based on UAV multispectral data: a case study of Yongzhuang Reservoir in Haikou. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(S1): 258-267.
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