应用数字图象技术研究卵石的几何形态

Application of Image Processing to the Analysis of Gravel Shape in Jialing River

通过数字图像处理技术 ,可以得到卵石的特征直径、扁平指标、三轴形状参数和圆度系数等几何参数 ,为研究河床卵石的几何形态提供了新手段。应用该技术对嘉陵江卵石形态的研究表明 ,卵石扁平指标沿程减小 ,球度系数沿程增大。根据c/b和b/a对卵石进行了分类 ,卵石在上游以盘形和棱形为主 ,在下游则以球形为主。研究成果有利于深入了解卵石推移质的运动机理。

The application of digital image processing technique to gravel shape analysis was introduced. The characteristics of shape factors(such as the maximum, intermediate & minimum diameters, the sphericity, and the degree of oblateness etc. ) of gravel in the Jialing River was obtained using the image processing system. The variation of shape factors along the river channel was analyzed. It was found that the degree of oblateness decreases while the sphericity incerases from upstream to downstream. Classification based on c/b and b/a shows that the gravel tends to be disc or blade edge in the upstream and spheroid in the downstream.