The initial space settings of suitable environments for plants strongly affect the mutual feedback evolution river landscape and terrestrial plants. Thus, based on morphological characteristics newly-defined systematic out-branching channels in nature, this study performs an effective simulation flow a designed moderately curved bend with single short branch. practice-based channel curvatures branch on–off conditions are controlled ANSYS FLUENT. results show that: (1) core zone...

The soil particle movement under seepage flow is one of the predominant mechanisms responsible for incidents and failures dams streambanks. However, little attention has been paid to critical hydraulic gradient two-dimensional (2-D) flow. In this study, a theoretical model was established 2-D predict gradients movement. model, sediment rolling theory used, while taking into account relative exposure degree grains direction. validated through qualitative analysis comparison with previous...

Asymmetric turbulent channel flow, such as ice-covered river is a century-old problem but still unsolved in hydraulics and fluid mechanics. This study finds exact solutions for its eddy (or turbulent) viscosity mean velocity distributions, which are independent of any assumption without fit parameter. Specifically, it first applies Guo's quartic complete log-law from high-Reynolds-number pipe flow to symmetric flow. It then formulates functional equation, involving both bottom top plane...

Studying the effects of different riparian vegetation densities on river channel evolution has practical significance for predicting process during flood periods and ecological engineering via artificial planting vegetation. In this study, we simulated formation processes channels under coverage rates in laboratory conditions. The were set as 0, 20, 40 80%, unilateral bilateral sides a bank. Given same flow sediment boundary conditions, experiments carried out 4 × 1.5 m tank. This paper...

Abstract Suffusion is a grave threat leading to accidents in embankment dams across the world. The process has been widely studied experimentally and numerically with gap‐grading cohesionless soil. One of direct observations studies finer particle loss However, movement particles numerical models commonly predicted an empirical law. This paper proposes theoretical model based on force balance soil probability distribution pores under one‐dimensional upward seepage flow. In proposed model,...

This study investigates the turbulent flows in simplified Dragon style river channels with a constant critical curvature and different single-short-branch characteristics, using an effective numerical method based on real geometry statistics. First, when branch outlet is closed, main channel, strong bed shear stresses are concentrated at inner bend apex downstream; as widens, more flow enters branch, reducing downstream velocities, increasing helical strength (I) kinetic energy (TKE);...

A depth-averaged linearized meander evolution model was used to numerically evaluate the spatiotemporal of meandering channel centerline in plane at various mean annual flows and width–depth ratios for capturing overall average trend planform. This analysis done better understand consistent responses river morphology possible future tectonic climatic changes. The computational cases included an idealized sine-generated with a moderate maximum deflection angle typical natural Jiyun River...

This study presents a novel approach for quantifying the dynamics of monthly hydraulic geometry relationships in Jingjiang reach Yangtze River by integrating leaf area index (LAI) data as an indicator riparian vegetation. A comprehensive system ordinary differential equations (ODEs) couples traditional power-law with LAI, capturing influence erosion control on channel morphology. The periodic delayed response theory and automatic differentiation techniques are employed to enhance modeling...

Laminar radial flow between two parallel disks is a fundamental nonlinear fluid mechanics problem described by the Navier-Stokes (NS) equation, but unsolved because (1) an exact solution not found even with extensive references, and (2) it unclear why remains laminar at high Reynolds numbers. This paper first presents velocity distribution solutions for developed inflows outflows, proving that both flows are brief Jacobi elliptic sine-squared functions different characteristics. For inflow,...

Sediment concentrations of Chinese rivers are among the highest worldwide. If sediment concentration exceeds a certain value, flow dramatically changes exhibiting properties different from low-concentration sediment-laden flows, both in movement and pattern transportation. The hyperconcentrated exhibits distinct phenomena, such as "instability flow", "clogging river", or "blast flow". Such phenomena related to formation, development break-up laminar layer, also reflect transition turbulent...

Core Ideas The existing theoretical model of the Hagen–Poiseuille law was modified to estimate hydraulic conductivity based on flow resistance a sphere. In model, capillary diameter calculated from porosity and soil particle size is recommended for average pore diameter. predictive results were analyzed with parameters other factors. an important parameter that required seepage calculations. Currently, many methods are available predict this parameter, but accuracy method not adequate....