摘要
以鄱阳湖及出入河流组成的复合水系统为研究对象,系统分析了湖泊关键水情要素的演变特征及其影响因素。基于近60年鄱阳湖水位、长江干流径流以及鄱阳湖主要入湖河流径流等综合数据集,采用Mann-Kendall检验和Sen’s slope法分析了鄱阳湖水情演变趋势与程度。结果表明,鄱阳湖水位、五河径流和长江径流在洪水期和枯水期呈现不同的变化趋势。鄱阳湖各站点特征水位(除康山站外)、流域五河各站点特征径流(除李家渡站外)、长江干流各站点特征径流(除宜昌站外),其他站点变化趋势基本一致,个别站点变化不一致是由于各支流在降水、人类活动等诸多方面具有差异性。就趋势变化而言,1970年以前鄱阳湖水位、流域五河(赣江、抚河、信江、饶河和修水)来水和长江径流均呈下降趋势,1970―1990年三者均处于不稳定的波动变化阶段,而1991―2004年三者均呈上升趋势,但2005年以后河流最大径流和湖泊水位呈明显下降趋势。
In the recent decades, the hydrological regimes of Poyang Lake clearly changed, the persistent dryness and rapid shrinkage of the Poyang Lake seriously threatened the security of the local human life and the stability of wetland ecosystem. Poyang Lake suffers from frequent droughts and floods in the Yangtze River basin, which greatly altered the river, lake, and wetland hydrological processes accompanied by the degeneration of the ecosystem, also affects the local industrial and agricultural production as well as the regional social and economic development. This paper analyzes the evolution of hydrological regimes in the Poyang Lake region and associated casual influencing factors. We focus on the integrated lake-catchment-Yangtze River system. The data of the 62-year lake water levels, the runoff of the Yangtze River and catchment discharges were used to explore the hydrological evolution under the changing environment. Additionally, the Mann-Kendall testing and Sen＇s slope methods were adopted in this study. Statistical results show that the Mann-Kendall testing and Sen＇s slope methods have similar results in terms of the trend analysis, while lake water level, the catchment river inflow and the Yangtze River discharge exhibit different variation trends in the flood and dry seasons. In addition, the extreme regimes for the droughts and floods are affected by the five major rivers and the stem stream of the Yangtze River. Generally, the characteristic values of lake water level （except for the Kangshan station）, catchment discharge （except for the Lijiadu station）, and the Yangtze River discharge （except for Yichang station） have the same decreasing trends before the 1970s, while they exhibit distinctly fluctuation between the 1970s and 1980s;however, the characteristic values have obviously increasing trends during the period from 1990 to 2000. A significantly decreasing variation trend is also observed after 2005. The finding in this paper would be helpful to the regulation and management of f
作者
王然丰
李志萍
赵贵章
谭志强
李云良
WANG Ranfeng LI Zhiping ZHAO Guizhang TAN Zhiqiang LI Yunliang(North China University of Water Resources and Electric Power, Zhengzhou 450000, China Key Laboratory of Watershed Geographic Sciences Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China)
出处
《热带地理》
2017年第4期512-521,共10页
Tropical Geography
基金
国家自然科学基金项目(41372260)
中国科学院流域地理学重点实验室开放基金(WSG2015004)
