南水北调中线工程渠道敏感性研究

Study on hydraulic response sensitivity of canal pools of the middle route of South-to-North Water Diversion Project

研究渠道非恒定流水力响应对节制闸调控作用的敏感性,对渠道的设计、运行控制方式的研究具有重要意义。本文以南水北调中线总干渠京石段为研究对象,通过构建中线工程的一维非恒定流仿真模型,分析了京石段各渠池下游水位波动对渠池上游节制闸运用的响应特性,并在此基础上定义了渠池的敏感性指标,该指标能很好地反映渠池首端的闸门调控对渠池下游水位的影响程度,中线渠池的敏感性指标与渠池的回水面积和渠池响应滞后时间成反比,并随输水流量的增大而增加。研究成果表明,中线干渠可以采用ID模型进行描述,同时,在设计流量工况下整定的控制器参数可以应用于小流量工况,采用这种方法可以节省控制器参数整定的工作量。

Study on the hydraulic response sensitivity of unsteady flow in a canal pool to its check gate operation is important to the design and control of water diversion project.This paper adopts unsteady 1-D flow simulation to analyze the sensitivity of fluctuating front depth to the canal head gate for the Jing-Shi channel of the middle route of south-to-north water diversion project.In this analysis,a sensitivity indictor is defined for the canal pool to well reflect the influence of gate operation on the pool.For this diversion project,such indictor is proportional to the canal flow rate,while it is inversely proportional to the canal＇s backwater area or the canal＇s delay time of hydraulic response.Results reveal that the canal can be simulated with an integration delay model and that the controller parameters tuned under design flow are applicable to the conditions of smaller flows,leading to a saving in the tuning work.