建立了适用于具有复杂内边界的、长距离调水明满流交替的一维非恒定流水力学系统, 并基于明渠和管道连 接的长距离输水工程, 设计了既有明渠流又有压力流的耦合流动模型。为了精确模拟流动的水力特性, 分析明满交 替流对工程运行的安全性和稳定性带来复杂的影响, 采用圣维南方程组和Pr eissmann 窄缝法计算了有压管流和自 由表面流以及这两种状态的过渡流等问题, 并加入水库、泵站、分水口、暗涵及闸堰等水工建筑物。利用该模型较好 地解决了南水北调中线工程北京段遇到明满流耦合计算的问题。

One2dimensio na l unsteady fr ee2surface2pressur e flow hydrodynamic system is developed which is suit able fo r the long2 distance water diversio n pr oject w ith complex inner boundar ies. Based on the long2distance water div ersio n pro ject w ith open channels and pipes, t he coupled flow sy stem w ith bo th o pen channel flow and pr essure flow is desig ned. In or der to simulate the hy dr aulic characterist ics accurately and analyze t he effects o f fr ee2surface2pressur e flow on t he stability and safet y o f the pro2 ject , Saint Venant equatio ns and Preissmann slit method w ere used to calculat e the pressure flow , fr ee2surf ace flow, and the tran2 sit ion flow, and r eser voirs, pump statio ns, diver sions, culverts, sluices, and other hydraulic structur es w ere added int o t he sys2 tem. The system can so lv e the pr oblems caused by the f ree2sur face2pressure flow in Beijing sect ion of the South2to2No rth Water Diver sion Pr oject.