【摘要】 该文利用明渠水流的水工模型实验手段探究单圆墩阻水效应空间分布规律及其阻水系数取值新方法。利用高精度超声水位测量系统,采集了墩柱附近特定影响区域内水位过程线,通过分析墩柱周围壅高幅值,验证了阻水效应特性与流态因子之间的新关系。定量分析了墩柱阻水效应的空间影响范围及水位变化的空间分布特征,推求墩柱阻水系数计算的新公式。研究结果可为大尺度河流水动力模拟中桥梁墩柱的概化提供一定参考依据。更多还原

【Abstract】 This paper investigates the spatial distribution characteristics of the backwater effect, and proposes a newway to determine the corresponding backwater coefficient based on series hydraulics tests in an open channel. The high-precision ultrasonic water depth measurement system is used to obtain the water surface elevation of the interest areas near the cylinder pier. Based on the measured data, the backwater amplitude is systematically analyzed, and a newrelationship characterizing the backwater effect and various flowconditions is verified. Quantitative analyses further clarify the influence scope of the backwater effect and the water depth variation characteristics, leading to a newempirical formula for calculating backwater degree. These results can be regarded as numerical simulation standards for generalizing bridge piers in the large-scale research of hydrodynamics in the future.更多还原