Satellite-Based Water Quality Assessment of the Beijing Section of the Grand Canal: Implications for SDG11.4 Evaluation

Author:

Xie Ya12,Zhou Qing34,Xiao Xiao34,Chen Fulong25ORCID,Huang Yingchun34,Kang Jinlong6,Wang Shenglei25,Zhang Fangfang25ORCID,Gao Min12,Du Yichen257,Shen Wei1,Li Junsheng258ORCID

Affiliation:

1. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China

2. Key Laboratory of Digital Earth Science, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China

3. Beijing Institute of Surveying and Mapping, Beijing 100038, China

4. Beijing Key Laboratory of Urban Spatial Information Engineering, Beijing 100038, China

5. International Research Center of Big Data for Sustainable Development Goals, Beijing 100094, China

6. Shaanxi Institute of Surveying and Mapping of Land Ltd., Xi’an 710054, China

7. College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China

8. School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

Abstract

The Beijing-Hangzhou Grand Canal in China became a World Cultural Heritage Site in 2014, and the water quality of this ancient man-made canal has increasingly attracted societal attention. This study focuses on monitoring the water quality of the Beijing section of the Grand Canal (BGC) using remote sensing technology. Analysis of the comprehensive trophic level index (TLI) indicates that the water in the Canal was predominantly light eutrophic from 2016 to 2022. The annual average results of the TLI reveal that the water quality in the Kunming Lake and North Canal of BGC is generally good, characterized by some mesotrophic waters, and others are in light eutrophication. The TLI for the entire BGC water body decreased from 64.7 in 2016 to 60.3 in 2022, indicating an improvement trend in water quality. Notably, the proportion of good water with TLI less than 60 increased from 50% in 2016 to 83% in 2022. This improvement of water quality may be attributed to the reduced use of fertilizers and pesticides and the implementation of various environmental policies by Beijing Municipal government. These findings offer valuable insights for the management and protection of the water resources of the BGC, and further contribute to the evaluation of the United Nations Sustainable Development Goal (SDG) 11.4.

Funder

National Key Research and Development Program of China

Publisher

MDPI AG

Reference84 articles.

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