平陆运河建设前极端降水对广西北部湾钦江输沙量影响OA
Impact of extreme precipitation on sediment discharge in Qinjiang River of Beibu Gulf in Guangxi before construction of Pinglu Canal
[目的]探究极端降水对广西北部湾钦江输沙量影响,为平陆运河工程建设和该区域河流管理提供重要科学依据.[方法]采用RClimDex模型、Pettitt突变检验和双累积曲线等方法分析工程建设前(1961-2021年)钦江流域极端降水和输沙量变化特征,量化极端降水对输沙量变化影响.[结果](1)钦江流域R1day,R5day,R99p和PRCPTOT极端降水指数呈下降趋势,其他指数(R10 mm,R25 mm,R95p,CWD和SDII)呈上升趋势,且所有趋势均不显著.(2)1961-2021年输沙量呈显著减少趋势(-0.445万t/a),并在1998年发生突变.[结论]极端降水指数与输沙量均呈显著相关性,R95p与输沙量相关性最强,双累计曲线计算其对输沙量减少的贡献为-25.7%.
[Objective]This study aims to investigate the impact of extreme precipitation on sediment discharge in the Qinjiang River of the Beibu Gulf in Guangxi,thereby providing important scientific support for the construction of the Pinglu Canal project and river management in this region.[Methods]The RClimDex model,Pettitt test,and double mass curve method were used to analyze the variation characteristics of extreme precipitation and sediment discharge in the Qinjiang River Basin before the project construction during 1961-2021,and to quantify the impact of extreme precipitation on sediment discharge.[Results](1)The extreme precipitation indices R1day,R5day,R99p,and PRCPTOT in the Qinjiang River Basin showed decreasing trends,while other indices(R10 mm,R25 mm,R95p,CWD,and SDII)showed increasing trends.All these trends were statistically insignificant.(2)The sediment discharge exhibited a significant decreasing trend(4.45×103 t/a)from 1961 to 2021,with an abrupt change occurring in 1998.[Conclusion]The extreme precipitation indices are significantly correlated with sediment discharge,with the strongest correlation observed between R95p and sediment discharge.The contribution of R95p to the reduction in sediment discharge is calculated to be-25.7%using the double mass curve.
Tong Kai;Zhao Yinjun;Hu Baoqing;Huang Xiakun;Deng Jianming;Pan Jiajia;Liu Huiwen;Xiao Dayuan
Key Laboratory of Environment Change and Resources Use in Beibu Gulf,Ministry of Education,Nanning Normal University,Nanning 530001,China||Guangxi Key Laboratory of Earth Surface Processes and Intelligent Simulation,Nanning Normal University,Nanning 530001,China||State Key Laboratory of Water Disaster Prevention,Hohai University,Nanjing 210098,ChinaKey Laboratory of Environment Change and Resources Use in Beibu Gulf,Ministry of Education,Nanning Normal University,Nanning 530001,China||Guangxi Key Laboratory of Earth Surface Processes and Intelligent Simulation,Nanning Normal University,Nanning 530001,ChinaKey Laboratory of Environment Change and Resources Use in Beibu Gulf,Ministry of Education,Nanning Normal University,Nanning 530001,China||Guangxi Key Laboratory of Earth Surface Processes and Intelligent Simulation,Nanning Normal University,Nanning 530001,ChinaHydrology Center of Guangxi Zhuang Autonomous Region,Nanning 530023,ChinaHydrology Center of Guangxi Zhuang Autonomous Region,Nanning 530023,ChinaGuangxi Coastal Hydrology Centre,Qinzhou,Guangxi 535000,ChinaGuangxi Coastal Hydrology Centre,Qinzhou,Guangxi 535000,ChinaGuangxi Coastal Hydrology Centre,Qinzhou,Guangxi 535000,China
天文与地球科学
输沙量极端降水钦江平陆运河
sediment dischargeextreme precipitationQinjiang RiverPinglu Canal
《水土保持研究》 2026 (1)
39-45,7
广西自然科学基金(2025GXNSFAA069302)国家自然科学基金项目(42161005,52469003)资助河海大学水灾害防御全国重点实验室"一带一路"水与可持续发展科技基金资助项目(2023491511)
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