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ORIGINAL RESEARCH
Abnormal Changes Diagnosis and its Control
Factors of Water and Sediment Discharge
in the Lower Reaches of the Three Largest
Rivers in China from 1960 to 2020
1
College of Marine Geosciences, Ocean University of China, Qingdao, Shandong, 266100, China
2
People’s Liberation Army of China Unit 93617, Beijing, 101400, China
Submission date: 2024-02-28
Acceptance date: 2024-04-27
Online publication date: 2024-08-05
Publication date: 2025-01-09
Corresponding author
Huiling Zheng
College of Marine Geosciences, Ocean University of China, Qingdao, 266100, Shandong, China, China
College of Marine Geosciences, Ocean University of China, Qingdao, 266100, Shandong, China, China
Pol. J. Environ. Stud. 2025;34(2):1957-1971
KEYWORDS
water and sediment dischargesabnormal changeMann-Kendall trend analysisPettitt testthe three largest rivers in China
TOPICS
ABSTRACT
There are general trends and significant and abnormal changes in water and sediment discharge in
rivers and estuaries, and the abnormal changes have been diagnosed frequently. Here we clarified the
time node and mechanism of abnormal changes in water and sediment discharges in the lower reaches of
the three largest rivers in China, which occurred with the increase of strong human activities and climate
change. Using the Mann-Kendall test, Pettitt test, and double cumulative curve methods, we analyzed
the data change characteristics of 5 hydrological stations: Lijin (Yellow River), Datong (Yangtze River),
Gaoyao, Shijiao, and Boluo (Pearl River) from 1960 to 2020. The results showed that the Yellow River
had significant and abnormal changes in water discharge in 1976 and 1986 separately, while the Yangtze
River and Pearl River didn’t show abnormal changes due to being located in different climatic zones. In
addition, the Yellow and Yangtze Rivers had abnormal changes in sediment discharge in 1997 and 1992,
separately, the West and East branch rivers of the Pearl River showed abnormal changes in 2000 and 1989,
separately, and the North branch rivers of the Pearl River only showed significant changes in 1999. Most
sediment abnormal changes for the three rivers occurred in 10 years, from 1990-2000, when there were
strong human activities, including water and soil conservation, sand mining, and dam construction. Dam
construction plays the most important role in sediment abnormal changes. The intensity after the sediment
abnormal change is around 5 times that before the abnormal change in the Yellow River, but the intensity
is only 2-3 times in the Yangtze River and Pearl River. The Yellow River shows a higher vulnerability to
water and sediment changes than the other two rivers under the influence of strong human activities and
thus needs to be carefully protected for sustainable use.
CONFLICT OF INTEREST
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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| eISSN: | 2083-5906 |
| ISSN: | 1230-1485 |
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