Numerical and experimental study of the flow through a geometrically accurate porous wind barrier model

Telenta, Marijo; Duhovnik, Jože; Kosel, Franc; Šajn, Viktor

doi:10.1016/j.jweia.2013.11.010

Cited by 35 publications

(11 citation statements)

References 15 publications

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“…The reason for this kind of phenomenon is that the spatial structure of forest belt affecting the microclimate would change the PM mass concentration inside the shelterbelt. In general, airflow through the forest belt can be divided into two parts: when lower air flow encounters the shelterbelt, owing to a blocking effect by the shelterbelt, part of the airflow moves directly through the shelterbelt gap; the friction between the airflow and the tree consumes more energy of the flow and causes the kinetic energy of the airflow to drop, which leads to the wind speed reducing [66][67][68][69]. The reduction in wind in the shelterbelt, not conducive to the spread of PM, which is prone to settlement, eventually leads to an increase in PM mass concentration.…”

Section: Particulate Mass Concentration Variation In Different Locatimentioning

confidence: 99%

The Concentrations and Reduction of Airborne Particulate Matter (PM10, PM2.5, PM1) at Shelterbelt Site in Beijing

Chen

Sun

et al. 2015

Atmosphere

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Particulate matter is a serious source of air pollution in urban areas, where it exerts adverse effects on human health. This article focuses on the study of subduction of shelterbelts for atmospheric particulates. The results suggest that (1) the PM mass concentration is higher in the morning or both morning and noon inside the shelterbelts and lower mass concentrations at other times; (2) the particle mass concentration inside shelterbelt is higher than outside; (3) the particle interception efficiency of the two forest belts over the three months in descending order was PM10 > PM1 > PM2.5; and (4) the two shelterbelts captured air pollutants at rates of 1496.285 and 909.075 kg/month and the major atmospheric pollutant in Beijing city is PM10. Future research directions are to study PM mass concentration variation of shelterbelt with different tree species and different configuration.

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Section: Particulate Mass Concentration Variation In Different Locatimentioning

confidence: 99%

The Concentrations and Reduction of Airborne Particulate Matter (PM10, PM2.5, PM1) at Shelterbelt Site in Beijing

Chen

Sun

et al. 2015

Atmosphere

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“…Wind-sand flow is supersaturated when it encounters the sand barrier. Decreased flow at base of the slope leads to deposition of medium to coarse sand [36][37][38][39] . The Straw/1.…”

Section: Effect Of Mechanical Sand Barrier On the Range Of Eroded Parmentioning

confidence: 99%

Using sediment grain size characteristics to assess effectiveness of mechanical sand barriers in reducing erosion

Xie

Dang

Yu-juan

et al. 2020

Sci Rep

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Wind and sand control features are important tools for limiting desertification. Sand barriers are one of the oldest engineering measures used to reduce wind-sand hazards. Their efficacy and exact mechanism by which they work has remained a topic of scientific debate however. Sediment grainsize distributions can help constrain their utility and function. This research analyzed sediment grain size distributions in samples collected from areas around six different types of sand barriers installed along the southeastern margin of the Tengger Desert. Results were compared with sediment from a bare dune area (no barriers) used as a control. The barrier area samples contained high proportions of coarse sand and relatively low proportions of silty sand and very fine sand. Fine and medium sand were present but clay was not. The lower proportions of fine sand and higher proportions of coarse sand relative to bare dunes documented an effective reduction in aeolian transport by the barriers. Samples from the barrier areas also showed poorer sorting relative to bare dune areas. This appeared as lower kurtosis values and wider frequency distribution curves relative to those measured from bare dunes samples. The wider cumulative frequency curves for samples from the barrier areas likely reflects the higher proportion of coarse-grained material. The Straw/1.5 and PLA/1 barrier types hosted greater sediment accumulation than that observed for the other barrier types (Straw/1, PLA/1.5, Mixed/1 and Mixed/1.5). Sediment grain size distributions showed that the base and middle slope areas of the dune experienced deposition, while the top of the dunes experienced erosion. The Straw/1 barrier (straw installed as a 1 × 1 m grid) performed best in terms of installation costs and protective effects for the study area. This study demonstrates how sediment grain size distributions can be used as quantitative proxies for sand barrier performance in reducing desertification. Desertification is a major environmental problem that disrupts industrial activity, agriculture, transportation, mining and residential life. Economic and social impacts have led to various measures aimed at preventing desertification 1-4. Mechanical sand barriers typically used to combat desertification 5-7 can effectively control the movement of sand particles by increasing the surface aerodynamic roughness and by reducing wind speed near the surface. Mechanical sand barriers disrupt wind-sand flow and also reduce the ability of wind to carry sand leading to reduced erosion and transport and greater accumulation in different areas. Deposition of fine particles through this process leads to higher proportions of fine grained sediment within and around the sand barrier, which in turn supports soil development and vegetation 8. Grain-size distributions in surface sediments can therefore serve as a spatial proxy for aeolian processes. Underlying surface factors can also influence wind erosion 9,10 , which represents a first order driving mechanism in desertification. As th...

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“…The required boundary condition for BHT mass transport on the limit of water body (border between water body and pipe material) was assumed as first type, time varying Dirichlet condition described as a specific BHT mass fraction. The value of BHT mass fraction applied as the boundary condition, reflecting the concentration of BHT migrating from plastic pipe to a thin layer covering pipe wall was determined by a trial and error method [56,57]. Calculations were performed for the constant length of time step equal to 60 s. Results of our calculations covered spatial, 3D distributions of, inter alia, flow velocity magnitude, axial and radial velocity, turbulence energy and intensity as well as BHT mass fraction.…”

Section: Modelling Studymentioning

confidence: 99%

Application Of Numerical Modeling In Quantitative Assessment Of BHT Dispersion In PE-HD Pipes

Musz

Kowalska

2015

Ecological Chemistry and Engineering S

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PE-HD water pipes are exposed to adverse environmental conditions, both during production and their subsequent use in the civil engineering. Several organic compounds migrating into water may lead to deterioration of water quality, especially its taste and odour. Commonly used antioxidant BHT and its products of degradation are leached into water as a result of degradation of the PE-HD pipes material. This paper presents the results of laboratory tests of BHT concentration changes in water circulating in the PE-HD close loop pipe of 30 m length as well as of numerical studies based on data obtained by the laboratory measurements. Numerical calculations were performed using the commercial software Fluent, Ansys Inc., based on the computational fluid dynamics (CFD) principles. The analysis of water samples confirmed the migration of the antioxidant from the pipe material into the water. The results of numerical analysis gave good agreement with the measured values.

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Numerical and experimental study of the flow through a geometrically accurate porous wind barrier model

Cited by 35 publications

References 15 publications

The Concentrations and Reduction of Airborne Particulate Matter (PM10, PM2.5, PM1) at Shelterbelt Site in Beijing

The Concentrations and Reduction of Airborne Particulate Matter (PM10, PM2.5, PM1) at Shelterbelt Site in Beijing

Using sediment grain size characteristics to assess effectiveness of mechanical sand barriers in reducing erosion

Application Of Numerical Modeling In Quantitative Assessment Of BHT Dispersion In PE-HD Pipes

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