条带型加糙体尺寸及加糙量对矩形明渠糙率的影响  

Influence of geometric size and roughened amount of strip roughened element on roughness of rectangular open channels

作　　者：邹俊 ZOU Jun(Jiangxi Academy of Water Science and Engineering,Nanchang 330029,China)

机构地区：[1]江西省水利科学院,江西南昌330029

出　　处：《水利水电快报》2024年第2期88-93,共6页Express Water Resources & Hydropower Information

基　　金：江西省水利厅科技项目“全湿周与底板加糙在水力学模型中的差异及关联性研究”(202022YBKT09)。

摘　　要：为研究条带型加糙体的尺寸及加糙量对矩形明渠糙率的影响,利用水工模型试验方法,设计了7种加糙体几何尺寸及3种加糙量工况,定量分析了加糙体参数与糙率之间的关系。结果表明:间距与高度比一定时,加糙体尺寸越大糙率越大,且系列数据表明加糙体尺寸与糙率呈线性规律,其斜率受加糙量影响,该线性规律可被用于反推加糙体的尺寸。加糙量与糙率呈现正相关性,但断面加糙量变化导致的糙率变化并不与加糙量变化呈等比例变化。随着加糙体尺寸的增加,糙率比值呈现增加趋势,加糙体尺寸的变化可放大断面加糙量变化带来的糙率变化。研究成果可为水力学模型以及实际工程的加糙提供参考。To study the effects of geometric size and roughened amount of strip roughened element on the roughness of rectangular open channels,a physical model test method was used,involving seven types of geometric size and three types of roughened amount.The relationship between the roughness and the parameters of the roughness elements was quantitatively analyzed.The results indicated that when the ratio of the spacing to the height of the roughened element was constant,the larger the size of the roughened elements,the greater the roughness.The series of data showed that the size of the strip roughened element exhibited a certain linear relationship with roughness,and the slope of this linear relationship was influenced by the roughened amount.This linear rule can be used to infer the size of the roughened element required for roughening.There was a positive correlation between roughened amount and roughness,but the change in roughness caused by the change in roughened amount was not proportional to the change in roughened amount.As the geometric size of the roughened element increased,the ratio of roughness showed an increasing trend.The change in the geometric size of the roughened element can amplify the change of roughness caused by the change in roughened amount.The research results can provide a references for roughening work of hydraulic models and actual projects.

关 键 词：糙率 条带型加糙 加糙量 水工模型试验 

分 类 号：TV131[水利工程—水力学及河流动力学]