透水丁坝挑角对河床保护区域影响的试验研究

Experimental study on effect of oriented angle of permeable groin on protection area of river-bed

透水丁坝具有挑流效果明显、造价低廉、维护容易等优点,广泛应用于我国诸多大小河流中。通过动床水槽试验,采用不同挑角的透水丁坝,对其附近的水流结构、形态以及坝后的保护宽度、淤积长度等因素进行了初步的分析和研究。通过试验分析可知:当丁坝透水率一定时,淤积长度和保护宽度均随着挑角的增大而减小,但保护宽度的变化很小。

As permeable groin has the merits of obvious flow oriented effect, lower construction cost and easy maintenance etc., it is widely used in the rivers in China. The preliminary analysis and study on the flow structures and patterns near groin and the protection width and sedimentation length behind it are made with the groins with various oriented angles through the flume experi- ment with movable bed model. The experimental analysis shows that at a constant permeability of the groin, the sedimentation length and protection width mentioned above are decreased along with the increase of the oriented angle of the groin, but the change of the protection width is a less.