main channel

Deep dredging of Xinyihe River for a main ocean outfall waterway for flood discharge from Huaihe River and Yi-Shu-Si River;

浚深新沂河使其成为淮沂沭泗下游合流排洪入海主河道的规划设想

,the main channel of the lower reaches of Luanhe River has changed into the Jidong Plain in the past years.

自更新世以来,滦河下游主河道在气候、植被、人文及新构造运动等因素影响下几经变迁形成了冀东平原区。

Three dimensional numerical simulation of confluence of debris flow and main river;

泥石流与主河交汇区三维数值模拟

Such disaster usually takes place in the confluence, at which debris now run into the main river.

通过对现有文献资料的总结，探讨了泥石流入汇后随主河水流运动的几种可能形态和运动特点，分析了主河河床的演变情况，并提出按主支流水沙相互作用的大小，将主河河床演变分为弯曲、摆动和急流－深潭３种类型；对不同类型河流河床演变进行了分析，为进行泥石流入汇对主河水流运动与河床演变影响的研究奠定了基础。

The mechanism of confluence between debris flow and main river, which discuss reciprocity between different liquids, is a brand-new question for fluid mechanics study.

泥石流与主河交汇问题是流体运动研究领域的一个新课题。