河西内陆河现代沉积物粒径与流域高程关系研究

应用数量统计学方法研究河西内陆河流域地貌对河流水沙过程的响应,研究证明河西各河流沉积物粒径与流域高差具有非常好的相关性,主峰-样点高差和参数P(即沉积物平均粒径(D)×水平长度(X)/多年平均流量(Q))值的直线、三次曲线相关决定系数分别为R2=0.917和0.949,高原面-样点高差和参数P值的直线、三次曲线相关决定系数分别是R2=0.966和0.976;经过运用直线和曲线相关模拟结果对比,结果表明三次方程曲线拟合具有相对好的拟合效果.这些结论为深入讨论古流域地形地貌演化具有重要的理论意义.

Modeling the relationship between Hexi inner continental river sediment grain-sizes and drainage basin height differences

In this paper, quantitative statistics are employed to evaluate the landform response to fluvial process in Hexi inner continental drainage. The study indicates that the grain sizes from various rivers sediments are well related to their height differences. The linear relative coefficient of the height difference between main peak and sampling site and parameter P (i.e. P=DX/Q, here D=mean granularity of sediments, X=horizontal length, Q=mean runoff) is 0.917, but their cubic relative coefficient is 0.949. The linear and cubic relative coefficients of the height differences between plateau surface and parameter P are 0.966 and 0.976, respectively. The comparison indicates that the cubic equation fitting is better that linear fitting. These conclusions have important significance for further research into drainage landscape evolution.