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Journal of Tropical Oceanography

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variations of suspended sediment concentration in the Qinjiang River in recent 60 years based on human activities and climate change

WANG Mengzhu1, XU Shanshan2, LI Shushi3, 4, 5, LI Jianming1, YANG Xialing6, HUANG Sheng7   

  1. 1. College of Marine Sciences, Beibu Gulf University, Qinzhou, 535011, China;

    2. Tiantao Experimental School of Nanning, Guangxi, Nanning, 530000, China;

    3. Guangxi Key Laboratory of Marine Environmental Disaster Processes and Ecological Protection Technology, Qinzhou, Guangxi, 535011, China;

    4. Guangxi Field Scientific Observation and Research Station of Pinglu Canal Mouth Bay Ecosystem, Qinzhou, Guangxi, 535011, China;

    5. Beibu Gulf Ocean Development Research Center(Beibu Gulf University), Qinzhou, Guangxi, 535011, China;

    6. Affiliated Middle School of Guangxi Yinghua International Vocational College, Qinzhou, Guangxi, 535000, China;

    7. No. 47 Middle School of Nanning, Nanning, Guangxi, 530000, China

  • Received:2025-06-26 Revised:2025-08-06 Accepted:2025-08-25
  • Supported by:
    National Natural Science Foundation of China (42366008); Guangxi Natural Science Foundation (2025GXNSFHA069274); Key Research Base of Humanities and Social Sciences of Universities in Guangxi Zhuang Autonomous Region “Beibu Gulf Ocean Development Research Center”

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Abstract: suspended sediment in the Qinjiang River and its influencing factors helps to reveal the evolution of the estuary delta and provide a scientific basis for canal engineering construction.Based on the suspended sediment and discharge data of Qinjiang River Luwu Hydrological Station, the change of suspended sediment concentration (SSC) in Qinjiang River and its driving factors are analyzed by means such as percentage method, Accumulative anomalies method and regression analysis.The results show that (1)The average SSC in the Qinjiang River has shown a "medium-high-low" change trend in the past 60 years. The period 1965–1980 was in the medium concentration stage, with an average suspension concentration of 0.24kg·m-3; 1981–1993 was a high concentration stage with an average suspension concentration of 0.33kg·m-3; 1994–2021 was a low concentration stage with an average suspension concentration of 0.16kg·m-3. (2) The monthly average maximum suspended sediment concentration of the three stages showed the characteristics of "high flood and low dry", and the monthly variation amplitude of the high concentration stage was the largest. The sediment concentration difference in the flood and dry seasons was significant, reflecting the seasonal response. (3) The frequency distribution of daily suspended sediment concentration shows significant stage characteristics. In the high concentration stage, the frequency of events with concentration greater than kg·m-3 reached 5.2%; In the low concentration stage, the frequency peaks were distributed in the range of 0.01~0.02kg·m-3. (4) Climate change and high-intensity human activities are important factors for the change of suspended sediment concentration in the Qinjiang River. The research results will provide a scientific basis for disaster prevention and mitigation of small and medium-sized rivers entering the sea and the construction of land canal in Southwest China.

Key words: Suspended sediment concentration, human activities, climate change, Pinglu Canal, Qinjiang River