水利建设中的输水工程,如供、排水渠道,渡槽,涵洞、隧洞等,常采用梯形和矩形断面,这些工程往往数量很大,投资很多。所以,如何选择最优水力断面,使这些工程以较小的工程量和投资,而能通过较多的水量是设计工作中值得研究的课题之一。 Water transfer projects in water conservancy construction, such as water supply and drainage channels, aqueducts, culverts and tunnels, often use trapezoidal and rectangular sections. These projects often involve large quantities and large investments. Therefore, how to choose the optimal hydraulic section, make these projects with a smaller amount of engineering and investment, and can pass more water is one of the topics worthy of study in the design work.