中文摘要：

为探究进口闸门开启时间和无压引水隧洞长度对无压输水系统水流过渡时间的影响,基于一维明渠非恒定流特征线法,并结合隐式差分法,建立“水库＋无压引水隧洞＋沉沙池”数值仿真分析模型,对含有沉沙池的无压输水系统的瞬变流过程进行了数值模拟.结果表明,进口闸门开启时间与无压引水隧洞长度均为影响系统水流过渡时间的敏感性因素.

英文摘要：

In order to study the influence of the entrance gate opening time and the length of the water diver- sion tunnel on the flow transition time in the free flow water delivery system, a model of transient flow of ＂reservoir ＋ free flow tunnel q- sand basin＂ is established by combining the characteristic lines with implicit difference method to do numerical simulation about transient process of the free-flow water delivery system with desilting basin. The results indicate that both the entrance gate opening time and the length of the water- diversion tunnel are sensitive factors of flow transition time.