人类活动和气候变化影响下钦江近60年悬浮泥沙浓度变化

doi:10.11978/2025089

Abstract

Abstract:

Understanding suspended sediment dynamics in the Qinjiang River and its influencing factors is essential for revealing the evolutionary mechanisms of estuarine delta and providing a scientific basis for canal engineering planning and construction. Based on the suspended sediment and discharge data from the Luwu Hydrological Station in the Qinjiang River, changes in suspended sediment concentration (SSC) and their driving factors were analyzed using methods such as the percentage method, accumulative anomaly analysis, and regression analysis. The results show that: (1) The average SSC in the Qinjiang River has followed a “medium-high-low” trend in the past 60 years. The period 1965-1980 was the medium concentration stage, with an average SSC of 0.24 kg·m⁻³; 1981-1993 was the high concentration stage with an average SSC of 0.33 kg·m⁻³; and 1994-2021 was the low concentration stage with an average SSC of 0.16 kg·m⁻³. (2) The monthly average maximum SSC in each of the stages exhibited the characteristics of “high in flood season and low in dry season”, with the largest monthly variation occurring during the high concentration stage. The significant difference in SSC between flood and dry seasons reflects a seasonal response. (3) The frequency distribution of daily SSC also showed distinct stage characteristics. During the high concentration stage, the frequency of SSC events exceeding 0.4 kg·m⁻³ reached 5.2%. In the low concentration stage, the frequency peaks were mainly distributed in the range of 0.01-0.02 kg·m⁻³. (4) Climate change and high-intensity human activities are important factors for the change of SSC in the Qinjiang River. These research results provide a scientific basis for disaster prevention and mitigation in small and medium-sized rivers flowing into the sea, as well as for the construction of the Pinglu Canal, a major land-sea channel in Southwest China.

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

CLC Number:

TV11

WANG Mengzhu, XU Shanshan, LI Shushi, LI Jianming, YANG Xialing, HUANG Sheng. Variations of suspended sediment concentration in the Qinjiang River in the past 60 years under the influence of human activities and climate change[J].Journal of Tropical Oceanography, 2026, 45(4): 126-139.

Figures/Tables 14

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Variations of suspended sediment concentration in the Qinjiang River in the past 60 years under the influence of human activities and climate change

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