长江镇江段河道采砂的影响及其控制利用的试验研究

Experimental study on the effects of sand mining on the riverbed deformation in Zhenjiang reach and its application

运用微尺度模型和基于普通相机的近景摄影测量三维图像解析技术针对河道采砂对长江镇江段河床演变的影响进行了试验研究 ,分析了镇江段河床演变的趋势 ,指出在征润洲北滩和五峰山附近科学合理地采砂有利于镇江段河床稳定。考虑到镇江段较长时期的河势稳定除改善征润洲 焦山一带态势还应遏制和畅洲南北汊逆转的趋势 ,必须采用包括河道采砂在内的综合治理措施。结果还表明微尺度模型可以用于河工动床模型研究 ,特别适用于多方案的定性分析与比较 。

The effects of sand mining on the riverbed deformation have been studied experimentally by using micro scale models and close-range photogrammetry. Based on the analyses about the general trend of riverbed deformation in Zhenjiang stretch, it has been pointed out that the sand mining scientifically on the northern Zhengrun-shoal and near Wufengshan area is beneficial to the riverbed steady of Zhenjiang stretch. However,to maintain the long term stabilization of the Zhenjiang stretch,it is neccessany to improve the situation nearby Zhengrun-shoal and Jiaoshan, the trend of reversion between the north branch and the south branch of Hechang-shoal,and more active synthetic measures should be taken too. It has been demonstrated that the microscale models could be used in the experimental study of riverbed deformation, especially for the qualitative analyses and comparisons of different schemes. On the other hand, close-range photogrammetry will have broad prospects in the digital experimental studies.