摘要
平滩水位是判定涨水漫滩及退水归槽的重要指标,为研究鄱阳湖平滩水位及退滩时间变化规律,将湖区自湖口起分别以星子、褚溪河口、棠荫、康山、瑞洪和吴城为界划分为Ⅰ~Ⅵ区。依据1998年和2010年实测地形数据,将各区基于几何标准判断的断面平滩水位对间距进行对数变换的加权平均,得出河段尺度的平滩水位,并据此分析退滩时间的变化,结果表明:各区平滩水位均呈下降趋势,其中Ⅴ区(瑞洪—康山)降幅最显著,下降1.18 m;平滩河槽形态变化以棠荫为界,棠荫以北水道向纵深方向发展,棠荫以南水道基本维持稳定;河相天数除Ⅴ区锐减外,其余各区均呈增加趋势,其中V区平滩水位下降对河相天数的锐减影响显著;Ⅴ区的退滩时间略有推迟,其余各区的退滩时间均有所提前,Ⅰ区(湖口—星子)和Ⅴ区的退滩间隔缩减近30 d。
Abstact:The bankfull stage is an important index to determine the flooding overplain and the retreat of water to the channel.In order to study the variation of bankfull stage and retreat time in Poyang Lake,the lake was divided into reachesⅠ~Ⅵstarting from the lake mouth,with Xingzi,Chuxi Hekou,Tangyin,Kangshan,Ruihong and Wucheng as boundaries.According to the measured data of cross sections in 1998 and 2010,after performing the logarithmic transformation weighted average on spacing of bankfull stage at each section,the bankfull stage at the reach scale obtained and used to analyze the channel evolution and the variation of beach retreat time of water.The results show that the bankfull stage in all reaches is showing a downward trend,among which the reach from Ruihong to Kangshan has the most significant decrease with a decrease of 1.18 m.The morphological changes of the river channel are bounded by Tangyin.The channel north of Tangyin develops in the deeper direction,while the channel south of Tangyin maintains basical stability.Except for reach V.The duration in river phase in all other reaches shows an increasing trend and the date of bench retreat of water is advanced.In reach V,number of days in the river phase decreases sharply and the date of bench retreat is delayed with the significantly decrease of bankfull stage,which resulting the shortening of retreating interval between the regionⅠ(Hukou—Xingzi)and the regionⅤof nearly 30 d.
作者
陆阿坤
屈一晗
徐辉荣
林青炜
唐立模
LU A-kun;QU Yi-han;XU Hui-rong;LIN Qing-wei;TANG Li-mo(College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China;Guangdong Provincial Design Institute of Water Conservancy and Electric Power,Guangzhou 510000,China)
出处
《泥沙研究》
CAS
CSCD
北大核心
2024年第5期58-65,共8页
Journal of Sediment Research
基金
江西省水利厅科技项目(202325ZDKT04)。
关键词
潘阳湖
平滩水位
平滩河槽形态
河相天数
退滩时间
Poyang Lake
bankfull stage
bankfull channel morphology
duration in river phase
beach retreat date
