测绘通报 ›› 2025, Vol. 0 ›› Issue (6): 24-29,72.doi: 10.13474/j.cnki.11-2246.2025.0605

• 学术研究 • 上一篇    

北江流域叶绿素a浓度反演及富营养化评价

谷钰泽1, 邓孺孺1,2,3, 李嘉怡1, 郭昱1, 华振群1, 旷志渊1, 黄迪1   

  1. 1. 中山大学地理科学与规划学院, 广东 广州 510006;
    2. 广东省水环境遥感监测工程技术研究中心, 广东 广州 510006;
    3. 南方海洋科学与工程广东省试验室(珠海), 广东 珠海 519082
  • 收稿日期:2024-10-25 发布日期:2025-07-04
  • 通讯作者: 邓孺孺。E-mail:eesdrr@mail.sysu.edu.cn
  • 作者简介:谷钰泽(1998—),男,硕士生,主要研究方向为水质遥感。E-mail:guyz@mail2.sysu.edu.cn
  • 基金资助:
    国家自然科学基金(41901352;41071230);广东省省级科技计划(2017B020216001);广东省基础与应用基础研究基金(2020A1515010780);广州市科技计划(202102020454);广东省基础与应用基础研究基金(2022B1515130001)

Chlorophyll-a concentration inversion and eutrophication assessment in the Beijiang River Basin

GU Yuze1, DENG Ruru1,2,3, LI Jiayi1, GUO Yu1, HUA Zhenqun1, KUANG Zhiyuan1, HUANG Di1   

  1. 1. School of Geography and Planning, Sun Yat-sen University, Guangzhou 510006, China;
    2. Guangdong Engineering Research Center of Water Environment Remote Sensing Monitoring, Guangzhou 510006, China;
    3. Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519082, China
  • Received:2024-10-25 Published:2025-07-04

摘要: 叶绿素a一定程度上可以直接表征浮游植物的生物量,因此水体富营养化的遥感监测关键在于对叶绿素a浓度的反演。本文基于辐射传输机理,构建遥感反演模型,以2022年7—8月北江流域的Sentinel-2数据为例,进行了叶绿素a浓度反演,减小其他组分的影响。反演结果精度较高,决定系数达0.84,平均相对误差为0.22μg/L、均方根误差为1.58μg/L。同时进行了富营养化评价、叶绿素a浓度空间分布特征分析,并针对5处明显存在富营养化的河段进行了成因分析。研究区整体富营养化情况较轻,主要为中营养状态,部分水体存在富营养化情况,主要分布在一些支流、库湾,其中长湖水库情况最严重,综合营养状态指数TLI达到了65.22,处于中度富营养化状态。

关键词: 富营养化, 叶绿素a, 辐射传输, Sentinel-2, 北江流域

Abstract: Chlorophyll-a can directly characterize phytoplankton biomass to a certain extent, so the key to remote sensing monitoring of water body eutrophication lies in the inversion of chlorophyll-a concentration. In this paper, we constructed a remote sensing inversion model based on the radiative transfer mechanism, and took the Sentinel-2 data from the Beijiang River Basin in July-August 2022 as an example of chlorophyll-a concentration inversion, which reduced the influence of other components. The results show a high degree of accuracy, with a coefficient of determination of 0.84 and an average relative error of 0.22 μg/L, and a root mean square error of 1.58 μg/L. Evaluation of eutrophication, characterization of the spatial distribution of chlorophyll-a concentration, and analysis of the causes of eutrophication were also carried out for five obvious eutrophic river sections. The overall eutrophication in the study area was mild, mainly in the middle trophic state, and eutrophication existed in some water bodies, mainly distributed in some tributaries and reservoirs and bays, among which the situation in the Changhu Reservoir was the most serious, with the integrated trophic state index TLI reaching 65.22, which was in the middle eutrophication state.

Key words: eutrophication, chlorophyll-a, radiative transfer, Sentinel-2, Beijiang River Basin

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