期刊
JOURNAL OF HYDRAULIC ENGINEERING
卷 137, 期 5, 页码 504-516出版社
ASCE-AMER SOC CIVIL ENGINEERS
DOI: 10.1061/(ASCE)HY.1943-7900.0000326
关键词
Groynes; Groyne fields; Rivers; Turbulence; Structures; Mixing layers; Flume experiments; Fixed beds
资金
- Road and Hydraulic Engineering Division (DWW) of the Ministry of Transport, Public Works and Water Management
Experiments have been carried out in a fixed-bed flume for a schematized straight river reach with groynes on one side to study the dynamics of the flow near groynes. The flume had a geometrical scale of 1:40, based on typical dimensions of the Dutch River Waal. Both emergent and submerged groynes were studied. The measurements demonstrate the differences in the nature of the turbulence between submerged and emerged groynes stages; and provide insight into the flow pattern in the vicinity of groynes, the shape and the extent of the mixing layer at different flow stages, and the dynamic behavior of the velocity along the mixing layer between the main channel and the groyne fields. A parameterization of the turbulence characteristics of the flow near groynes is presented. Large-scale velocity fluctuations are found in all test cases, with timescales that vary with the flow stage. The large-scale u and v velocity fluctuations are in phase in the center of the mixing layer and out of phase for the points on the boundaries of the mixing layer. DOI: 10.1061/(ASCE)HY.1943-7900.0000326. (C) 2011 American Society of Civil Engineers.
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