浙江缙云县好溪河曲的几何描述

Morphometric Delineation of Meanders of Haoxi River in Jinyun, Zhejiang Province

以实测的河曲几何参数为基础,用多项式拟合法拟合了浙江省缙云县好溪的6个河曲,引入解析几何中描述空间曲线的曲率和挠率二个参数,计算出6个河曲曲率平均值介于0.001 4~0.077 8 km^-1之间;挠率平均值介于-0.000 2~0.131 8 km^-1之间.根据各河曲曲率和挠率曲线特征将6个河曲分别归类,并探讨了各个类型的影响因素,发现好溪河曲的几何特征主要与河床岩性、地质构造和沉积物特征相关,但人工扰动因素的影响十分显著.

Based on the measured geometric parameters of meanders,six meanders of Haoxi River in Jinyun County,Zhejiang Province were fitted by polynomial fitting method.By introducing two parameters of curvature and torsion to describe spatial curves in analytic geometry,the average curvature and torsion of six river meanders were calculated to be between 0.001 4~0.077 8 km^-1 and-0.000 2~0.131 8 km^-1 respectively.According to the characteristics of curvature and deflection curves of each river meander,six river meanders were classified and the influencing factors of each type were discussed.It is found that the geometric characteristics of Haoxi River meander are mainly related to the lithology,geological structure and sediment characteristics of the river bed,but the influence of artificial disturbance factors is very significant.