新丰江水库CODMn多时相遥感监测
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旷志渊(2000-),男,硕士研究生,主要研究方向为水质遥感。Email:kuangzhy5@mail2.sysu.edu.cn。 |
Copy editor: 陈昊旻
收稿日期: 2024-09-14
修回日期: 2025-05-20
网络出版日期: 2026-06-03
基金资助
南方海洋科学与工程广东省实验室(珠海)资助项目(311024015)
国家自然科学基金项目“水中典型重金属:铜、铁和镉浓度遥感反演机理及其敏感性研究”(41901352)
“大气复杂颗粒物的散射特征及遥感反演模型”(41071230)
广东省省级科技计划项目“珠江三角洲大气污染高分遥感监测及预警”(2017B020216001)
广东省基础与应用基础研究基金项目“基于辐射传输理论的水体重金属水面光谱反演模型构建——以广东省北江流域为例”(2020A1515010780)
“面向广东海岸线和海域海岛的海洋及环境数据立体感知与监测共享方法研究”(2022B1515130001)
广州市科技计划项目“广州市土壤重金属遥感探测机理研究——以铜和镉为例”(202102020454)
Multi-temporal remote sensing monitoring of chemical oxygen demand in Xinfengjiang Reservoir
Received date: 2024-09-14
Revised date: 2025-05-20
Online published: 2026-06-03
为了保护新丰江水库水质,监测分析库区富营养化风险,该文基于水下辐射传输过程,综合考虑影响水下光场的叶绿素a、总悬浮物和高锰酸钾指数(chemical oxygen demand,CODMn)3种水质要素,建立了一种遥感反演CODMn的分析模型,并对水库及周边河流的富营养化现象进行多时像监测。精度验证结果显示,该模型的均方根误差(root mean square error,RMSE)为0.682 5 mg/L,平均绝对百分比误差(mean absolute percentage error,MAPE)为25.219 7%,证明该模型在复杂水域的准确性。对新丰江水库水质的时空分析则表明,水库主体水质状况长期保持良好,但由于存在大量的渔场养殖和人为排放,忠信河的水质状况存在较为频繁的富营养化现象,这可能对整个水库的水质构成潜在威胁。对忠信河重点监测,及时处理违规排放行为,并在流域建设植被排水沟等一系列生态工程,可有效减少农业面源污染输入,从而促进新丰江水库生态环境的恢复和改善。
旷志渊 , 邓孺孺 . 新丰江水库CODMn多时相遥感监测[J]. 自然资源遥感, 2025 , 37(5) : 44 -52 . DOI: 10.6046/zrzyyg.2024301
To protect the water quality of the Xinfengjiang Reservoir and monitor the eutrophication risk,this study developed an analytical model for remote sensing inversion of chemical oxygen demand (CODMn) based on the underwater radiative transfer process. This model comprehensively takes into account three water quality parameters that influence the underwater light field:chlorophyll a,total suspended matter,and CODMn. The model was applied to conduct multi-temporal monitoring of eutrophication in the reservoir and its surrounding rivers. Through accuracy verification,the model achieved a root mean square error of 0.68 and a mean absolute percentage error of 25.22%,demonstrating its reliability in complex water environments. The spatiotemporal analysis of the water quality in Xinfengjiang Reservoir revealed the consistent good quality of the main body over the long term. However,due to extensive aquaculture and anthropogenic discharges,the Zhongxin River exhibited frequent eutrophication,which may pose a potential threat to the overall water quality of the reservoir. It is recommended to enhance monitoring of the Zhongxin River,promptly address illegal discharges,and implement ecological engineering measures such as vegetative drainage ditches in the watershed. These efforts can effectively reduce agricultural non-point source pollution,contributing to the restoration and improvement of the ecological environment of Xinfengjiang Reservoir.
表1 回归精度评价结果Tab.1 Regression accuracy evaluation results |
| 样本 | 斜率 | 截距 | R2 | RMSE/ (mg·L-1) | MAPE/% |
|---|---|---|---|---|---|
| E1 | 0.801 2 | 0.411 9 | 0.355 8 | 0.682 5 | 25.219 7 |
| E2 | 1.222 1 | -0.116 3 | 0.618 4 | 0.235 6 | 13.697 7 |
| E3 | 1.145 7 | -0.056 6 | 0.466 8 | 0.475 6 | 16.468 1 |
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