一、数学模型的建立和优化设计近年来,为了解决我国许多城市严重缺水的问题,各地相继建成了多条跨地域的长距离大口径输水管线工程,设计参数普遍朝着高压、大流量、大管径方向发展。笔者通过自己的设计实践,深感到对于长距离大口径输水管线这样使命重大、可靠性、安全性要求高,投资规模巨大、少则几千万、多则几 First, the establishment of mathematical models and optimization of design In recent years, in order to solve the problem of serious water shortage in many cities in our country, a number of large-scale long-distance water supply pipeline projects have been built around the country. The design parameters are generally toward high pressure, large flow The development of large diameter pipe. Through my own design practice, I deeply feel that such a mission as long-distance large-caliber water pipeline is of great importance, high reliability and safety requirements, huge investment scale, ranging from tens of millions to as many as several