Environmental Fluid Mechanics
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Effects of a sharp change of emergent vegetation distributions on thermally driven flow over a slope
Environmental Fluid Mechanics - Tập 15 - Trang 771-791 - 2014
In this study, thermally driven flow within a sharp change of rooted emergent vegetation distributions is discussed. A conceptual and linear model is developed to study the interferences and competitions between two forcing mechanisms (vegetation shading and sloping bottom effects) on circulation patterns. The two forcing mechanisms can counteract or reinforce each other according to the presence ......
Evolution and decay of gravity wavefields in weak-rotating environments: a laboratory study
Environmental Fluid Mechanics - Tập 18 - Trang 1509-1531 - 2018
Gravity waves are prominent physical features that play a fundamental role in transport processes of stratified aquatic ecosystems. In a two-layer stratified basin, the equations of motion for the first vertical mode are equivalent to the linearised shallow water equations for a homogeneous fluid. We adopted this framework to examine the spatiotemporal structure of gravity wavefields weakly affect......
Buoyancy-Driven Two-Layer Exchange Flows Across a Slowly Submerging Barrier
Environmental Fluid Mechanics - Tập 6 - Trang 133-151 - 2006
Results are presented from a combined analytical and laboratory study of unsteady, two-layer, density-driven, sub-maximal exchange over a slowly-descending estuarine barrier located very close to the junction of the river mouth and the near-shore coastal zone. As in the precursor study (Cuthbertson et al. 2004, Environ. Fluid Mech. 4, 127–155) that the present investigation extends, the rate of de......
Tối ưu hóa thiết kế cấu trúc trong dòng chảy dựa trên mô phỏng: Các ván đá Dịch bởi AI
Environmental Fluid Mechanics - - 2018
Chúng tôi áp dụng mô hình động lực học thủy lực kết hợp ba chiều, Mô phỏng Dòng chảy Ảo (VFS-Geophysics) ở chế độ Navier–Stokes trung bình Reynolds không ổn định, đóng với mô hình $$k-\omega$$ để mô phỏng dòng chảy hỗn loạn và vận chuyển sediment trong các dòng nước có đáy cát và sỏi quy mô lớn dưới các điều kiện mô hình và đáy sống. Kết quả mô phỏng được sử dụng để thực hiện các thí nghiệm số hệ ......
#mô phỏng dòng chảy #cấu trúc trong dòng chảy #ván đá #vận chuyển sediment #mô hình thủy động lực học
Characterization of turbulence statistics on the non-aerated skimming flow over stepped spillways: a numerical study
Environmental Fluid Mechanics - Tập 16 - Trang 1195-1221 - 2016
In this work we address the mean flow and turbulence statistics in the non-aerated region of a stepped spillway by using two different numerical strategies in two dimensions. First, we present results regarding the flow in a large portion of the spillway, simulated with a volume of fluid (VoF) method to capture the position of the free surface (case A). Numerically-obtained data are in very good a......
Effect of atmospheric boundary layer stability on the inclination angle of turbulence coherent structures
Environmental Fluid Mechanics - Tập 18 - Trang 637-659 - 2017
Coherent structures in the atmospheric boundary layer are fundamental to the transport of momentum and heat as well as to the production of turbulence. The present work attempts to investigate the behavior of the inclination angle of the vortex packet structures (
$$\gamma$$
......
Experimental study on growth and spread of dispersed particle-laden plume in a linearly stratified environment
Environmental Fluid Mechanics - Tập 15 - Trang 1241-1262 - 2015
We present results of laboratory experiments conducted to study the evolution, growth, and spreading rate of a dispersed particle-laden plume produced by a constant inflow into a density varying environment. Particles having mean size,
$$d_p=100\ \upmu $$
......
Modeling ice cover effect on river channel bank stability
Environmental Fluid Mechanics - Tập 22 - Trang 1121-1133 - 2022
This paper presents a numerical model study on the ice cover effect on bank stability in non-cohesive alluvial channels. The model consists of a coupled two-dimensional finite element unsteady hydrodynamic model with bank erosion and mass failure processes for open water and ice-covered conditions. The associated morphological change is modeled with non-equilibrium sediment transport, including th......
Flow through layered vegetation in open channel flows: effect on velocity and discharge distribution
Environmental Fluid Mechanics - - Trang 1-19 - 2023
In natural river systems, layered vegetation like grass, shrubs, and tall bushes greatly affects the biodiversity, morphological process, and distribution of nutrients and pollutants. Previously, the effects of uniform one-layered vegetation on the flow structure and hydrodynamics have been extensively studied. However, due to the complexity of flow dynamics in the vegetated channel, multiple-laye......
Comments on “Development of an empirical equation for the transverse dispersion coefficient in natural streams” by Tae Myoung Jeon, Kyong Oh Baek and Il Won Seo
Environmental Fluid Mechanics - Tập 8 - Trang 97-100 - 2007
In a recent paper published in this journal, Jeon et al. ((2007), Environ Fluid Mech 7(4): 317–329) have presented a new empirical equation for the transverse dispersion coefficient in natural streams that was developed based on the hydraulic and geometric parameters using a regression technique. A total of 32 data sets collected in 32 streams was used. Among them, 16 data sets were used for deriv......
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