北江千吨级航道整治研究:Ⅰ一维数学模型与枢纽调节下非恒定流传播特性

Study on the Beijiang River 1 000twaterway regulation: Ⅰone-dimensional numerical model development and propagation characteristics of unsteady flow under hydraulic projects regulation

基于圣维南方程,建立了北江白石窑枢纽坝下至飞来峡枢纽坝下约75km河段的一维非恒定流数学模型.对白石窑枢纽下游航道的非恒定流特性进行了研究,为水库调度方案和河道通航方案的设计提供了依据.模型验证结果表明,计算值与实测值符合情况较好,所建模型合理可靠.运用验证后模型模拟白石窑枢纽的两种不同日调节下泄过程,分析了该河段的非恒定流传播特性.针对飞来峡枢纽运行调度中无预泄、预泄12h和预泄24h三种方案,分析了不同运行调度措施下飞来峡反调节作用对白石窑下游水流特性及通航条件的影响.通过分析各方案下研究河段的最大时水位变幅,得知该河段时水位变幅能满足船舶安全通航要求.

One-dimensional numerical model of 75 km reach between Baishiyao complex and Feilaixia complex is established based on Saint Venant equations to study the un- steady flow characteristics of Baishiyao complex＇ downstream waterway. This research can be provided as the basis for the design of the complex dispatching and navigation scheme. Model validation results show that the calculated values agree well with the measured values, the model is reasonable and reliable. After verifying the model, two dif- ferent daily discharge processes of Baishiyao complex are simulated to analyze the propa- gation characteristics of unsteady flow for this 75 km reach. Three dispatching alterna-tives of Feilaixia complex without pre-discharge, or with pre-discharge for 12 hours and 24 hours are calculated to study the effect of Feilaixia complexes reverse regulation on the downstream flow characteristics and navigation condition of Baishiyao complex. In addition, the result of maximum water level change per hour indicates that the flow con- dition of this reach can satisfy the safety navigation requirements of water level change per hour.