Two dimensional bed deformation model in turbulent streams

2019 ◽  
Vol 17 (2) ◽  
pp. 73-84
Author(s):  
Amin Gharehbaghi ◽  
Birol Kaya ◽  
Gökmen Tayfur
Keyword(s):  
Deformation Model ◽  
Two Dimensional ◽  
Bed Deformation

Morphological effects of a hydraulic lifting dam on the middle Fenhe River, China

2021 ◽  
Author(s):  
Yufang Ni ◽  
Zhixian Cao ◽  
Wenjun Qi ◽  
Xiangbin Chai ◽  
Aili Zhao
Keyword(s):  
Shallow Water ◽  
General Pattern ◽  
Water Storage ◽  
Main Channel ◽  
Environmental Restoration ◽  
Two Dimensional ◽  
Compound Channel ◽  
Computationally Efficient ◽  
Bed Deformation ◽  
Numerical Predictions

<p>Hydraulic lifting dams become increasingly popular in China for water storage, river landscaping and environmental restoration. Inevitably, dams influence riverine morphology. Unfortunately, current understanding of this topic has remained rather limited. Here, the morphological effects of a hydraulic lifting dam on the middle Fenhe River, China are investigated. This reach features a compound channel and floodplains, and the riverbed is mainly composed of silt that can be easily eroded, indicating potential significant bed deformation. A computationally efficient depth-averaged two-dimensional shallow water hydro-sediment-morphodynamic model is employed. Unstructured meshes are refined around dam structures to accurately present topography. The numerical predictions show discrepancies of morphological responses of the main channel and floodplains to different operation schemes of the hydraulic lifting dam. This work helps to support decisions on the management of hydraulic lifting dams on the middle Fenhe River and reveals a general pattern for the morphological impact of hydraulic lifting dam.</p>

Nonlinear Analysis of the In-Plane Young’s Moduli of Two-Dimensional Cellular Materials with Negative Poisson’s Ratios

2007 ◽  
Vol 334-335 ◽  
pp. 157-160
Author(s):  
Hui Wan ◽  
Zhen Yu Hu ◽  
Wu Jun Bao ◽  
Guo Ming Hu
Keyword(s):  
Large Deflection ◽  
Small Deformation ◽  
Small Strain ◽  
Cellular Materials ◽  
Deformation Model ◽  
Two Dimensional ◽  
Young’S Moduli ◽  
Incomplete Elliptic Integrals ◽  
Poisson's Ratios ◽  
Poisson’S Ratios

This study deals with the in-plane Young’s moduli of two-dimensional auxetic cellular materials with negative Poisson’s ratios. The in-plane Young’s moduli of these cellular materials are theoretically analyzed, and calculated from the cell member bending with large deflection. Expressions for the in-plane Young’s moduli of the above-mentioned cellular materials are given by incomplete elliptic integrals. It is found that the in-plane Young’s moduli of two-dimensional cellular materials with negative Poisson’s ratios depend both on the geometry of the cell, and on the induced strain of these cellular materials. The in-plane Young’s moduli are no longer constants at large deformation. But at the limit of small strain, they converge to the results predicted by the small deformation model of flexure.

Prediction of Overtopping Dike Failure: Sediment Transport and Dynamic Granular Bed Deformation Model

2019 ◽  
Vol 145 (6) ◽  
pp. 04019021 ◽  
Author(s):  
Francisco Nicolás Cantero-Chinchilla ◽  
Oscar Castro-Orgaz ◽  
Subhasish Dey
Keyword(s):  
Sediment Transport ◽  
Deformation Model ◽  
Granular Bed ◽  
Bed Deformation ◽  
Dike Failure
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