南水北调工程保水堰水力特性研究

南水北调天津干线采用分段低压输水方式后，保水堰作为有压管道中的衔接性水工建筑物，结构独特，流态复杂，在输水系统中起着关键作用。本文通过保水堰的水工模型试验和数值模拟，得到了保水堰的水力特性，即保水堰的局部水头损失系数、流量系数和水流流态随着水位而变化的规律，其成果对长距离调水水力计算和工程设计有重要的意义。

Study on Hydraulic Characteristics of Water Conservation Weir in the South-to-North Water Transfer Project

Water conservation weir,a new kind of linkage hydraulic structure for low-pressure subsection conduits in the Tianjin section of the South-to-North Water Transfer Project,plays an important role in the water conveyance system because the structure of water conservation weir is unique and its flow pattern is complicated.This paper derives the hydraulic characteristics of water conservation weir through hydraulic model test and numeric simulation of water conservation weir.The rule that is the local head loss coefficient, flow coefficient and flow pattern varies with the water level.It has significance for hydraulic calculation and design of long-distance water transfer project.