摘要
以大通站为例,用回归分析的方法研究了长江入海悬移质泥沙的粒度特征。结果表明,无论是各年年内变化、多年平均的年内变化、还是历年变化,入海悬移质泥沙粒度均随流量增加而变粗,表明水动力条件对长江入海悬移质泥沙粒度特性具有明显的控制作用。入海悬移质泥沙粒度随含沙量的变化多数年份随含沙量增加而先增后减,少数年份随含沙量增加而增大,年内变化的总趋势是随含沙量增加而先增后减;历年变化则随含沙量增加而先减后增,这些变化行为与水动力条件和泥沙供应有关。
Based on the data from Datong gauging station of Yangtze River,the grain-size characteristics of suspended sediment has been studied by using regression analysis. All the plots of suspended sediment grain-size against water discharge indicates the same trend that grain-size value increases with the rising of water discharge,which shows an obvious influence of the hydro-dynamic element on the suspended sediment grain-size features.The grain-size change with concentration is more complicated:for most years,with the increase of the mean monthly concentration,the corresponding grain-size increases to a maximum and then decreases; for other years,the mean monthly grain-size rises with the rising of the mean monthly concentration.The plot of the mean multi-year monthly grain-size against the corresponding concentration exhibits the parabola-shaped curve with the mouth open downwards,which is contrary to that of the mean yearly grain-size against the mean yearly concentration.All these relations between grain size and sediment comcentration are related to hydro-dynamics and sediment supplies.
出处
《泥沙研究》
CSCD
北大核心
2005年第1期26-32,共7页
Journal of Sediment Research
关键词
悬移质泥沙
粒度特征
回归分析
大通站
长江
suspended sediment
grain-size
regression analysis
Datong gauging station
Yangtze River
