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1 丁坝在弯道护岸中的应用原理丁坝是弯道横向整治建筑物的主要形式。大多在河道凹岸修建,一端与河岸相接,另一端伸向河槽,与水流方向成斜交(60。左右),常采用非淹没式丁坝。弯道水流经过丁坝时,改变了水流方向,控制水流从坝头经过后会出现扩散,但扩散后的水流又经过下一条丁坝,使水流继续受到约束,最大流速区水流沿坝头形成设计的弯道,使螺旋流避开了凹岸。在丁坝控制区域内引起流速重新分布,水深和泥沙运移发生变化。通过合理布置丁坝群系统完全可以起到约束水流、保护河岸、控制泥沙
1 dams dam in the revetment principle of application dam groin is the main form of horizontal curb construction. Mostly built in the bank of the river bank, one end is connected with the river bank, the other end is extended to the river channel, obliquely intersecting with the flow direction (about 60.), non-submerged dikes are often used. When the water flow in the bend passes through the Dingba dam, it changes the direction of the water flow to control the water flow to diffuse from the dam head. However, the diffused water flow passes through the next dam and the water flow continues to be restrained. The water flow at the maximum flow rate zone is designed along the dam head Curved, spiral flow to avoid the concave shore. In the area dominated by the dam, the flow velocity is redistributed and the water depth and sediment transport change. By reasonably arranging the system of the Dingba Group, it can completely restrain the water flow, protect the river bank and control the sediment