长江流域资源与环境 >> 2023, Vol. 32 >> Issue (10): 2124-2136.doi: 10.11870/cjlyzyyhj202310011

• 自然资源 • 上一篇    下一篇

湖南省四水流域近60 a输沙变化特征及其归因分析

谢红霞1,刘雨洁1, 隋兵2, 周清1, 段良霞1*, 朱星龙1   

  1. (1. 湖南农业大学资源环境学院,湖南 长沙 410128; 2. 气象防灾减灾湖南省重点实验室,湖南 长沙 410118)
  • 出版日期:2023-10-20 发布日期:2023-10-26

Characteristics and Attribution Analysis of Sediment Transport in the  Four River Basins of Hunan Province Over the Past 60 Years

XIE Hong-xia1, LIU Yu-jie1, SUI Bing2, ZHOU Qing1, DUAN Liang-xia1, ZHU Xing-long1   

  1. (1.College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China; 2.Hunan Key Laboratory for Meteorological Disaster Prevention and Reduction, Changsha 410118, China)
  • Online:2023-10-20 Published:2023-10-26

摘要: 为了解湖南省湘、资、沅、澧四水流域近60 a输沙变化特征及其对降雨、径流和人类活动变化的响应,对四个流域降雨量、径流量和输沙量进行了趋势、突变及周期性分析,并量化了气候变化和人类活动对输沙量变化的相对贡献率。结果表明:(1)4个流域年降雨量、暴雨量及径流量(澧水除外)均呈上升趋势,而输沙量均呈显著下降趋势;(2)各流域内降雨量、径流量和输沙量年代间的变化趋势较为一致,但变化幅度不相同;(3)4个流域降雨量和径流量均未发生显著突变,但湘江和资江流域、沅江和澧水流域输沙量分别在1998与1994年发生减少的显著突变;(4)湘江流域降雨量和输沙量的第1主周期与径流量的第2主周期一致,为53~55 a;资江和沅江流域径流量和输沙量的第1主周期为35~36 a,与降雨量的第2主周期43 a接近;澧水流域降雨量和径流量的第1主周期与输沙量的第3主周期一致,为53~55 a;(5)在基准期,4个流域的降雨量、径流量和输沙量存在协同趋势,而在变化期,降雨、径流和人类活动的共同作用下输沙量较基准期显著减少,趋势协同性逐渐异化,人类活动是四水流域输沙减少的主要因素。大坝建设和水土保持措施的配置能在一定程度上调节流域输沙量,人类通过合理调控能在一定程度上开发利用自然资源、发展社会经济及改善生态环境。


Abstract: In order to understand the characteristics of sediment transport and its response to rainfall change, runoff change and human activities in the Xiang River, Zi River, Yuan River and Li River Basins of Hunan Province in the past 60 years, the trend analysis, abrupt change analysis, periodicity analysis of rainfall and sediment transport were conducted. Results indicated: (1)The annual rainfall and storm in all four basins and the annual runoff in the Xiang River, Zi River and Yuan River Basins appeared an increasing trend, while the annual runoff in the Li River Basin appeared a decreasing trend. However, the annual sediment transport in all the four basins decreased significantly. (2) There was a consistency in the interdecadal variation trend of rainfall, runoff and sediment transport in each river basin, but the variation ranges were different in different decades. (3) There were no significant abrupt changes in rainfall and runoff, while the sediment transport indicated a significant abrupt decrease in 1998 for Xiang River and Zi River Basins, and in 1994 for Yuan River and Li River Basins. (4) The first main cycle of rainfall and sediment transport in the Xiang River Basin was consistent with the second main cycle of runoff, which were around 53-55 years; The first main cycle of runoff and sediment transport in the Zi River and Yuan River Basins were 35-36 years, which was close to the second main cycle of 43 years for rainfall;The first main cycle of rainfall and runoff and the third main cycle of sediment transport in the Li River Basin was the same, which was 53-55 years. (5) For the base period,the trend was synergistic between rainfall, runoff and sediment transport in the four river basins. While in the changed period affected by the combined action of rainfall, runoff and human activities, sediment transport demonstrated a significant decrease and the trend synergy showed a gradual divergent. This implied that human activities were the main factors causing the reduction of sediment transport. In summary, sediment transport may be regulated through the construction of dams and the configuration of soil and water conservation measures. Through reasonable regulation, we may balance the utilization of natural resources, development of social economy and the improvement in ecological environment. 

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