Characteristics of the Total Suspended Matter Concentration in the Hongze Lake during 1984–2019 Based on Landsat Data

The Hongze Lake is the fourth largest freshwater lake in China and an important lake for the East Route of the South-to-North Water Diversion Project. The water quality of the lake affects social development and the lives of residents. To assess the impacts of environmental changes and human activit...

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Bibliographic Details
Published inRemote sensing (Basel, Switzerland) Vol. 14; no. 12; p. 2919
Main Authors Du, Chenggong, Li, Yunmei, Lyu, Heng, Shi, Kun, Liu, Naisen, Yan, Chen, Pan, Jinheng, Guo, Yulong, Li, Yuan
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 18.06.2022
Subjects
Algorithms
Annual variations
Climate change
driving factors
Environmental changes
Environmental impact
Eutrophication
Flooding
Freshwater lakes
GDP
Gross Domestic Product
Hongze Lake
In situ measurement
Landsat
Precipitation
Remote sensing
Rivers
Satellite imagery
Suspended matter
total suspended matter
Trends
Water diversion
Water pollution
Water quality
Wind
Wind speed
Jiangsu China
China
Huai River
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Summary:The Hongze Lake is the fourth largest freshwater lake in China and an important lake for the East Route of the South-to-North Water Diversion Project. The water quality of the lake affects social development and the lives of residents. To assess the impacts of environmental changes and human activities on the distribution of the total suspended matter (TSM) in the Hongze Lake, we developed an algorithm that utilizes the near-infrared (NIR) band to estimate TSM based on in situ measurements. The algorithm was applied to Landsat images to derive TSM distribution maps from 1984 to 2019, revealing significant inter-annual, seasonal, and spatial variability. The relationship between TSM, precipitation, and wind speed was analyzed, and we found that: (1) The estimation model of TSM concentration in the Hongze Lake constructed for TM and OLI has a high accuracy, and it can be used to jointly monitor TSM concentration in the Hongze Lake for long-term series; (2) From 1984 to 2019, the concentration of TSM in the Hongze Lake showed a trend of first rising and then falling, with the maximum value in 2010 at 100.18 mg/L mainly caused by sand mining activities. Precipitation and wind speed weakly influence the inter-annual variation of TSM concentration; (3) The concentration of TSM in the Hongze Lake in summer is easily affected by flooding in the Huai River, and the concentration of TSM in other seasons is significantly negatively correlated with precipitation; (4) TSM is highest in the Huaihe Bay, followed by the Lihe Bay and Chengzi Bay. The main reason for this is that the input of the Huaihe Bay flows directly into this lake area and is also the main navigation channel. The results of this study are of great significance for the protection and management of the water environment of the Hongze Lake.
ISSN:2072-4292
2072-4292
DOI:10.3390/rs14122919