Three-Dimensional Hole Size (3DHS) Approach for Water Flow Turbulence Analysis over Emerging Sand Bars: Flume-Scale Experiments

Water

卷:14

Nayan Sharma¹  Murtaza Hasan²  Raied Saad Alharbi³  Mohammad Amir Khan⁴  Rishav Garg⁴  Giuseppe Francesco Cesare Lama⁵  Gianluigi Busico⁶ 

[1] Center for Environmental Sciences & Engineering (CESE), Shiv Nadar University, Greater Noida 201314, India;

[2] Department of Civil Engineering, Chandigarh University, Mohali 40413, India;

[3] Department of Civil Engineering, College of Engineering, King Saud University, P.O. Box 800, Riyadh 11421, Saudi Arabia;

[4] Department of Civil Engineering, Galgotia College of Engineering, Knowledge Park I, Greater Noida 201310, India;

[5] Department of Civil, Architectural and Environmental Engineering (DICEA), University of Naples, Federico II, 80125 Napoli, Italy;

[6] Department of Environmental, Biological and Pharmaceutical Sciences and Technologies, Campania University Luigi Vanvitelli, 81100 Caserta, Italy;

关键词: flume-scale analysis;    ADV;    flow-bar interaction;    3D turbulence;    TKE;    octagonal bursting events;   

DOI  :  10.3390/w14121889

来源: DOAJ

【 摘 要 】

The many hydrodynamic implications associated with the geomorphological evolution of braided rivers are still not profoundly examined in both experimental and numerical analyses, due to the generation of three-dimensional turbulence structures around sediment bars. In this experimental research, the 3D velocity fields were measured through an acoustic Doppler velocimeter during flume-scale laboratory experimental runs over an emerging sand bar model, to reproduce the hydrodynamic conditions of real braided rivers, and the 3D Turbulent Kinetic Energy (TKE) components were analyzed and discussed here in detail. Given the three-dimensionality of the examined water flow in the proximity of the experimental bar, the statistical analysis of the octagonal bursting events was applied to analyze and discuss the different flume-scale 3D turbulence structures. The main novelty of this study is the proposal of the 3D Hole Size (3DHS) analysis, used for separating the extreme events observed in the experimental runs from the low-intensity events.

【 授权许可】

Unknown