摘要
新沂河海口控制工程深泓闸闸下泓道长约１．３ｋｍ，河床由淤积历时较长的淤泥质粘性土组成。试验中首先取原状土土样，通过水槽试验确定起动流速，据此选择模型沙和进行模型设计。试验表明，下游河道冲刷主要由过闸水流及河口跌水造成，其中，前者形成的冲刷坑为设计的控制条件。根据试验结果认为，对于新沂河海口控制工程这样流量大、河口潮位低的闸下泓道，冲刷是不可避免的，建议放弃海漫防冲的方法，改设板桩截墙。试验中采用的某些观点和方法，对于淤泥质粘土海岸地区河口段闸下冲刷研究具有一定的参考价值。
The river reach downstream of tidal barrage at Xin Yi He River Mouth is about 1 3km long. The river bed is made up of cohesive soil. In the experiment, soil samples were taken from the construction side at first, and incipient velocity was then determined in a flume, which was used to design the scour model and to select sand material. The experiment has shown that the river scour is unavoidable due to larger discharge and lower tidal level at Xin Yi He River Mouth. The Scour is caused by the flow passing through the structure and the water drop near the river mouth, and the scour close to the structure is more critical for the tidal barrage design. It is suggested that the antiscour wall should be used instead of riprap. Ideas and methods adopted in the experiment can afford some experiences for study on river scour under similar conditions.
出处
《海洋工程》
CSCD
1999年第2期60-70,共11页
The Ocean Engineering
关键词
动床模型
冲刷坑
粘性土
起动流速
movable bed model scour cohesive soil incipient velocity
