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[1]WANG Yonghong,PENG Jin,HUANG Chang,et al.Abnormal Changes Diagnosis and Its Control Factors of Water and Sediment Discharge in the Lower Reaches of Pearl River Basin from 1960 to 2019[J].Research of Soil and Water Conservation,2022,29(05):21-31.

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Abnormal Changes Diagnosis and Its Control Factors of Water and Sediment Discharge in the Lower Reaches of Pearl River Basin from 1960 to 2019

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 29 Number of periods: 2022 05 Page number: 21-31 Column: Public date: 2022-08-20

Title:: Abnormal Changes Diagnosis and Its Control Factors of Water and Sediment Discharge in the Lower Reaches of Pearl River Basin from 1960 to 2019

Author(s):: WANG Yonghong¹, PENG Jin¹, HUANG Chang¹, WU Hongxu², CAI Silong², LIU Feng³; (1.Key Lab of Submarine Geosciences and Prospecting Techniques, MOE, College of Marine Geosciences, Ocean University of China, Qingdao, Shandong 266100, China; 2.Guangdong Bureau of Hydrology, Guangzhou 510150, China; 3.School of Marine Engineering and Technology, Sun Yat-sen University, Zhuhai, Guangdong 519082, China)

Keywords:: Pearl River Basin; water and sediment variability; mechanism analysis; Mann-Kendall trend analysis; Pettitt test

CLC:: P333.4

DOI:: -

Abstract:: In order to clarify the time node and mechanism of water and sediment variability in the lower reaches of the Pearl River Basin under strong human activities, we diagnosed their variations using Mann-Kendall nonparametric rank correlation test, Pettitt test method and double cumulative curve methods based on the long-time series water and sediment discharge from 1960 to 2019 at Gaoyao, Shijiao, Boluo, Makou and Sanshui hydrological stations. The main control factors of the variation were also clarified. The results show that:(1)according to the three study methods, the variation of the water and sediment changes can be divided into two levels: abnormal and significant changes;(2)the water discharge of Makou station changed significantly in 1986, which was mainly controlled by climate change; it had the abnormal change in 1991 at the Sanshui station, which was caused by the rapid decline of its transect caused by human sand excavation, and the water discharge increased rapidly after the redistribution of diversion ratio of water discharges between Sanshui and Makou; there were no abnormal and significant changes of water discharge in other stations;(3)the sediment discharge only has significant change at the Shijiao station in 1999, which is controlled by the construction of the upstream reservoir. However, the sediments have the abnormal changes at the other four stations, and the change time and reason of each station are different. The sediment discharges of Gaoyao station and Makou station changed around 1999—2000, and the main control factor is the construction of upstream reservoirs and dams. The sediment discharges of Sanshui station in the main stream of the North River and Boluo station in the East River changed in 2003 and 1988 respectively, which is mainly caused by water and soil conservation in the upper reaches. In conclusion, the variation of water and sediment discharges in the lower reaches of the Pearl River Basin is mainly controlled by human activities. Understanding its variation mechanism is of great significance to the protection and sustainable utilization of the estuarine ecological environment.

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Last Update: 2022-08-20