Study of the transverse distribution of suspended sediment concentration in compound channel with emergent vegetation on floodplain

Journal of Hydrology, Journal Year: 2025, Volume and Issue: unknown, P. 133444 - 133444

Published: May 1, 2025

Language: Английский

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Advancement of Non-Newtonian Fluid with Hybrid Nanoparticles in a Convective Channel and Prabhakar’s Fractional Derivative—Analytical Solution

Fractal and Fractional, Journal Year: 2021, Volume and Issue: 5(3), P. 99 - 99

Published: Aug. 17, 2021

The present paper deals with the advancement of non-Newtonian fluid containing some nanoparticles between two parallel plates. A novel fractional operator is used to model memory effects, and analytical solutions are obtained for temperature velocity fields by method Laplace transform. Moreover, a parametric study elaborated show impact flow parameters presented in graphical form. As result, dual predicted increasing values short long times. Furthermore, nanoparticle concentration, can be raised along decreasing velocity. approach provide new insight which makes interpretation results easier enable way testing possible approximate solutions.

Language: Английский

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Flood inundation and risk mapping under climate change scenarios in the lower Bilate catchment, Ethiopia

Natural Hazards, Journal Year: 2023, Volume and Issue: 118(3), P. 2199 - 2226

Published: July 25, 2023

Language: Английский

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Effect of submerged vegetation on hydraulic resistance of ice-covered flows

International Journal of Sediment Research, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 1, 2024

Language: Английский

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Modelling Water Flow and Soil Erosion in Mediterranean Headwaters (with or without Check Dams) under Land-Use and Climate Change Scenarios Using SWAT

Water, Journal Year: 2022, Volume and Issue: 14(15), P. 2338 - 2338

Published: July 28, 2022

The use of check dams is a common strategy to reduce soil erosion in the Mediterranean headwaters. However, effects these control works on water flow rates and sediment yields have been scarcely investigated under possible scenarios climate land-use changes. On this regard, hydrological models, such as SWAT, provide reliable predictions variable environmental conditions. To fill gap, study has evaluated effectiveness response forest headwater Calabria (Southern Italy) comparison with an unregulated subcatchment very similar In different combined change (through three GCMs two RCPs applied time period next 80 years) land (forest, pasture, cropland) headwaters were analysed using SWAT model. model was first calibrated third climatic, soil, conditions, verification showed satisfactory prediction capacity rate. rate (coefficients determination efficiency Nash Sutcliffe equal 0.71 0.67, respectively, percent bias 14.9%). No significant differences detected for between subcatchments (with or without dams) among scenarios. This linked low both forcing actions, which influenced works. estimated higher values mean maximum RCP2.6 compared RCP8.5. Both predicted be all regulated always produce more runoff dams. increases up 60% 30–35% yield RCP2.6. Although there limitation due lack validation data (due unavailable records yield), demonstrated how catchments may not effective conservation purposes several decades after their installation semiarid areas, where are limited.

Language: Английский

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Flood inundation mapping under climate change scenarios in the Boyo watershed of Southern Ethiopia

Journal of Water and Climate Change, Journal Year: 2022, Volume and Issue: 13(8), P. 3170 - 3188

Published: Aug. 1, 2022

Abstract This research aims to map flood inundated areas under changing climate in the Boyo watershed of Southern Ethiopia. A semi-distributed physically based Hydrologic Engineering Center-Hydrologic Modeling System (HEC-HMS) and Center-River Analysis (HEC-RAS) were used simulate events maps, respectively, for scenarios. The bias-corrected data four models baseline (1976–2005), mid-term (2041–2070) long-term (2071–2100) cycles RCP4.5 RCP8.5 50- 100-year return period generated from future streamflow data. HEC-RAS model was inundation depths events. result exhibited that average annual rainfall maximum minimum temperatures catchment will increase with an runoff. severity floods would Approximately, 193 ha study may be flooded having a 100 years scenario period, which is extreme case. benchmark reduce risk management floodplains this watershed.

Language: Английский

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Bedload transport through emergent vegetation: current status and its future prospect

Environmental Fluid Mechanics, Journal Year: 2023, Volume and Issue: 23(3), P. 711 - 733

Published: March 26, 2023

Abstract Vegetation present in the water streams, on banks and floodplain areas largely affects river hydraulics. Indeed, vegetation significantly influences hydrodynamics, sediment transport, bedforms, pollutant transport. Environmental management of rivers requires an understanding various processes predictive capabilities models. In past, many studies were conducted, especially laboratory settings, order to quantify flow resistance due vegetation. It is only recently that effects transport came attention researchers. particular, both suspended bedload considered. This paper reviews recent works conducted effect incipient motion With regard motion, methods based critical velocity, turbulence, drag, velocity bed roughness boundary layer have been discussed. For shear stress, turbulent kinetic energy, a revisiting classical formulas for estimating non-vegetated channels, estimation from erosion around single stem are analyzed. Finally, indications further research new development provided.

Language: Английский

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An efficient isogeometric/finite-difference immersed boundary method for the fluid–structure interactions of slender flexible structures

Computer Methods in Applied Mechanics and Engineering, Journal Year: 2023, Volume and Issue: 418, P. 116495 - 116495

Published: Oct. 17, 2023

In this contribution, we present a robust and efficient computational framework capable of accurately capturing the dynamic motion large deformation/deflection responses highly-flexible rods interacting with an incompressible viscous flow. Within partitioned approach, adopt separate field solvers to compute dynamics immersed structures evolution flow over time, considering finite Reynolds numbers. We employ geometrically exact, nonlinear Cosserat rod formulation in context isogeometric analysis (IGA) technique model elastic each three dimensions (3D). The Navier–Stokes equations are resolved using pressure projection method on standard staggered Cartesian grid. direct-forcing boundary is utilized for coupling IGA-based structural solver finite-difference fluid solver. order fully exploit accuracy IGA FSI simulations, proposed introduces new procedure that decouples resolution domain from Uniformly distributed Lagrangian markers density relative Eulerian grid generated communicate between grids consistently IGA. successfully validate against two- three-dimensional benchmarks involving flexible filaments undergoing deflections/motions show six times coarser mesh than delivers accurate results classic benchmarks, leading major gain efficiency. simultaneous spatial temporal convergence studies demonstrate consistent performance framework, showing it conserves convergence, which same as

Language: Английский

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Characteristics of Turbulence in the Downstream Region of a Vegetation Patch

Water, Journal Year: 2021, Volume and Issue: 13(23), P. 3468 - 3468

Published: Dec. 6, 2021

In presence of vegetation patches in a channel bed, different flow–morphology interactions the river will result. The investigation nature and intensity these structures is crucial part research works engineering. this experimental study, characteristics turbulence non-developed region downstream patch suffering from gradual fade have been investigated. changes turbulent structure were tracked sequential patterns by reducing size. model was selected carefully to simulate aquatic natural rivers. Velocity profile, TKE (Turbulent Kinetic Energy), power spectra quadrant analysis used investigate behavior structures. results velocity profile indicate that there are three flow layers patch, including wake layer, mixing layer shear layer. When wide enough (Dv/Dc > 0.5, termed as width ratio, where Dv Dc channel), highly intermittent anisotropic events appear at depth z/Hv = 0.7~1.1 distance x/Hv 8~12 (where x streamwise edge, z vertical bed Hv height patch). show associated with dominance outward (Q1). Moreover, accompany large coherent Reynolds stresses, anomalies velocity, increases standard deviation Turbulent Energy (TKEi). extents decrease size patch. On other hand, decreases, von Karman vortexes form dominant

Language: Английский

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Triggering of Rain-Induced Landslides, with Applications in Southern Italy

Water, Journal Year: 2023, Volume and Issue: 15(2), P. 277 - 277

Published: Jan. 9, 2023

Landslides cause fatalities, widespread damages and economic losses. Quite frequently, they are triggered by rainfall. Many studies have investigated the relationships between rainfall characteristics landslide events. This paper reviews two main approaches, physical hydrological, for modelling such relationships. In approach, influence of on slope stability is commonly analysed in terms groundwater infiltration, pore pressure changes balance shear stresses resistances, therefore a considerable amount hydrogeological, morphological geotechnical data required. hydrological statistical-probabilistic study series dates occurrence movements instead carried out. Both types methods briefly presented, with examples from real applications to cases Southern Italy. particular, recent reactivations large rockslide Northern Calabria been modelled means approaches. addition, shallow landslides Calabria, Campania Sicily employing Strengths weaknesses adopted discussed, together causes that may hindered better results considered cases. For illustrated through application cases, research perspectives as well their possible use early warning systems.

Language: Английский

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