摘要
由于溃坝失事后果的严重性,文章研究了溃坝过程中的水流特性,建立了二维矩形水柱在重力作用下瞬间全溃的数学模型,基于无量纲数分析,运用数值模拟的方法对比了深宽比在1：1~8：1时不同初始水位矩形水体坝前残余水深在溃坝过程中的变化规律。结果表明：矩形水柱在溃坝过程中上游残余水深的变化规律具有一致性,并推导得到了基于深宽比的坝前残余水深函数随时间变化的统一公式,该公式在特征时间小于6,深宽比1~8时具有较高的精度。
Because of the seriousness of the consequences of dam-break,this paper studies the flow characteristics during the process of dam-break,and establishes the mathematical model of dam-break in a two-dimensional rectangular water column under gravity.The rule of residual water depth during the process of dam-break in a rectangular water column is compared at the ratio of 1 ∶ 1 to 8∶ 1 with the method of numerical simulation based on dimensional analysis.The results shows that the rule of residual water depth during the process of dam-break in a rectangular water column is consistent,and a uniform formula of the residual water depth in the upstream depending on time was derived based on the aspect ratio.The formula has a high accuracy when characteristic time is less than6,and aspect ratio is 1~8.
出处
《江苏科技信息》
2016年第8期78-80,共3页
Jiangsu Science and Technology Information
关键词
溃坝
残余水深
无量纲数
数值模拟
统一公式
dam break
residual water depth
dimensionless number
numerical simulation
unified formula
