Integrative Study on Flow Characteristics and Impact of Non-Submerged Double Spur Dikes on the River System

Zhenghua Gu, Xiaomeng Cao, Minxiong Cao and Weizhen Lu ()
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Zhenghua Gu: College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China
Xiaomeng Cao: Teaching Center, Zhejiang Open University, Hangzhou 310012, China
Minxiong Cao: Key Laboratory of Port, Waterway & Sedimentation Engineering, Ministry of Communications, Nanjing 210029, China
Weizhen Lu: Department of Architecture and Civil Engineering, City University of Hong Kong, Hong Kong, China

IJERPH, 2023, vol. 20, issue 5, 1-13

Abstract: The flow characteristics around non-submerged spur dikes continuously placed in the channel on the same side with orthogonal angle to the wall were investigated by numerical simulations and experimental measurements. Three-dimensional (3D) numerical simulations with the standard k − ε Model for incompressible viscous flow based on finite volume method and the rigid lid assumption for free surface treatment were conducted. A laboratory experiment was applied to verify the numerical simulation. The experimental data indicated that the developed mathematical model can effectively predict 3D flow around non-submerged double spur dikes (NDSDs). The flow structure and turbulent characteristics around them were analyzed and it was found that a distinct cumulative effect of turbulence exists between the dikes. By examining the interaction rules of NDSDs, the judgment criterion of spacing threshold was generalized as whether velocity distributions at the cross-sections of NDSDs along the main flow approximately coincided or not. It can be used to investigate the impact scale of the spur dike groups on the straight and prismatic channels and it is of great significance for artificial scientific river improvement and the assessment of river system health under human activities.

Keywords: spur dike group; dike spacing; river system; CFD; flume experiment (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2023
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