摘要
针对南水北调中线输水渠道缺少调节水库的现实情况,采用一维非恒定流数学模型,模拟了渠道中某一节制闸出流量以不同速率关闭而导致上游渠道中出现的水流漫溢现象。结果显示,水流漫溢现象最先发生在被关闭节制闸前。闸下出流量的变化速率越快,出现漫溢的时间也越短,闸门关闭期间的闸前水位上涨速度与闸下出流量的变化速率呈线性变化关系。实际条件下,为尽量避免出现漫溢事故,应尽量缓慢关闭闸门,延长渠道出现漫溢的时间,以留出更多的时间去启动退水闸或其他分流设施。
In consideration of the fact of being lack of regulation reservoirs on the middle route of South-to-North Water Transfer Project, the overflowing phenomenon occurring in the upstream channel induced by closing down of a regulation gate at different flux change velocities was simulated by use of 1- D unsteady flow mathematical model. The results showed that the overflowing phenomenon occurred in front of the closed gate at first. With the increase of the flux change velocity of the flow passing the gate, the overflowing phenomenon occurred earlier, and the rise of water level in front of the gate during its closing period was of a linear relationship with the flux change velocity of the flow passing the gate. Therefore, under the real condition, it is necessary to close the gate as slowly as possible so that overflowing accidents could be avoided, and more time could be obtained to startup escape gates and other diversion facilities.
出处
《水利水电科技进展》
CSCD
北大核心
2007年第4期11-14,共4页
Advances in Science and Technology of Water Resources
基金
国家自然科学创新研究群体科学基金(50221903)
关键词
南水北调中线工程
节制闸
非恒定流
流量变化速率
漫溢
South-to-North Water Transfer Middle Route Project
regulation gate
unsteady flow
flux change velocity
overflowing
