时间变态对模型水流运动相似影响试验研究

Experimental Investigation into Flow Movement Similarity of Time Distorted Physical Model

利用长江防洪模型上荆江河段,以不同时间变率作为控制方式对上荆江2003年9月1日至9月30日实测水文过程进行模拟,测量了模型入流、尾水、沿程水位、断面平均流速变化过程等。研究了上荆江模型在不同时间变率下沿程水位、流量、平均流速与原型相似的程度并对偏差产生的原因进行分析,在此基础上对尾门滞后控制方式如何提高试验精度进行了研究。

The real hydrologic measuring process of the upper Jingjiang River was simulated using the Changjiang River flood-control physical model for the upper Jingjiang River with different time distortion rates in Sept.1~30,2003.Also,the varying process of model in-flow,tail water,water level and average flow velocity in the cross sections along the course were measured.The similarity of water level,flow,average flow velocity along the course of the upper Jingjiang River model with different time distortion rates to the prototype was studied,and the cause generating deviations was analyzed,on the basis of which how to improve the accuracy of controlling patterns of tail gate delay is studied.