透水框架群促淤护滩效果Ⅰ:平面布置形式

Effect of deposition promotion and beach protection with penetrating frame groups Ⅰ:plain layouts

在长江航道整治工程实践中,透水框架群的促淤护滩效果得到了很好的证实。已有研究成果均集中在透水框架群及其周围水流特性和床面冲淤特征方面,而透水框架群护滩效果的衡量指标尚未见文献报导;此外,透水框架群不同平面布置形式对河床冲淤特征的影响远不清楚。通过概化水槽模型试验,研究了冲刷条件下透水框架群守护心滩的河床冲淤特性,提出了透水框架群护滩效果的衡量指标,并对比分析了透水框架群多种平面布置形式的冲淤特性和促淤保沙效果,提出了冲刷条件下,透水框架群护心滩的平面布置设计原则。

In the practice of the Yangtze River channel regulation engineering,the effects of deposition promotion and beach protection of penetrating frame groups have been proven.Previous studies focus on penetrating groups,current characteristics,and bed morphology characteristics.However,there is a lack of studies on the measurement index of the effects of beach protection of penetrating frame groups.Moreover,the effects of different plain layouts of frames on bed morphology characteristics have not been clarified.This paper concentrated on the bed morphology characteristics whose central bar was protected by the penetrating frame groups under the influence of river scouring through generalized flume experiments.The measurement indexes of effects of frame groups was proposed.The characteristics of erosion and deposition as well as the effects of deposition promotion and sand protection of different layout designs were compared and the layout design principles of the central bar under the influence of scouring were concluded accordingly.