Comparative study of flow field and drag coefficient of model and small natural trees in a wind tunnel

Manickathan, Lento; Defraeye, Thijs; Allegrini, Jonas; Derome, Dominique; Carmeliet, Jan

doi:10.1016/j.ufug.2018.09.011

Cited by 55 publications

(34 citation statements)

References 49 publications

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“…Prior observations have shown a reduced growth in drag force on trees with increasing (Fraser, 1962;Kane & Smiley, 2006;Koizumi et al, 2010;de Langre et al, 2012;Manickathan et al, 2018;Mayhead, 1973). The drag reduction is attributed to reconfiguration of the tree crown which leads to streamlining as a result of the change in area (Harder et al, 2004;Rudnicki et al, 2004;Vollsinger et al, 2005;Manickathan et al, 2018). The effect of the changing area has often been taken into account through the use of a Vogel number (Vogel, 1989), , and the drag is assumed to grow as 2+ , where has a negative value to compensate for the streamlining effect.…”

Section: Modification For Tree Crown Deformationmentioning

confidence: 94%

Wind speed inference from environmental flow–structure interactions

Cardona

Bouman

Dabiri

2021

Flow

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Section: Modification For Tree Crown Deformationmentioning

confidence: 94%

Wind speed inference from environmental flow–structure interactions

Cardona

Bouman

Dabiri

2021

Flow

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“…To simulate intensive olive grove exploitations, models of equal sizes are used. In this work, and according to the aerodynamic porosity defined by Manickathan et al [35], a constant tree porosity value of approximately α = 0.22 is assumed.…”

Section: Methodsmentioning

confidence: 99%

A New Methodology for Assessing the Interaction between the Mediterranean Olive Agro-Forest and the Atmospheric Surface Boundary Layer

2021

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Historically, the olive grove has been one of the most emblematic ecosystems in Mediterranean countries. Currently, in Andalusia, Spain, the land under olive grove cultivation exceeds 1.5 million hectares, approximately 17% of the regional surface. Its exploitation has traditionally been based on the use of the available land and heterogeneous plantations, with different species adapted to southern Mediterranean climatic conditions, and to the management of the traditional olive cultivation culture. The objective of this work is to characterize the mechanical behavior of the atmospheric surface boundary layer (SBL) (under neutral stability) interacting with different olive grove configurations. Experimental tests were carried out in the Boundary Layer Wind Tunnel (BLWT) of the Andalusian Institute for Earth System Research (IISTA), University of Granada. Three representative configurations of olive groves under neutral atmospheric conditions were tested. The wind flow time series were recorded at several distances and heights downwind the olive plantation models with a cross hot wire anemometry system. Herein, this paper shows the airflow streamwise, including the mean flow and the turbulent characteristics. The spatial variability of these two mechanical magnitudes depends on, among others, the size, the agro-forest length, the layout of the tree rows, the porosity, the tree height, the crown shape and the surface vegetation cover. The aerodynamic diameter and Reynolds number for each agro-forest management unit are proposed as representative variables of the system response, as these could be related to olive grove management. The plantation, in turn, conforms to a windbreak, which affects the microclimate and benefits the elements of the ecosystem. Detailed knowledge of these variables and the interaction between the ecosystem and the atmosphere is relevant to optimize the resources management, land use and sustainability of the overall crop. Thus, this paper presents preliminary work to relate atmospheric variables to environmental variables, some of which could be humidity, erosion, evapotranspiration or pollen dispersion.

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“…City and district parks and squares, which are located within the built-up area of the city, play an extremely important role for residents. Trees, shrubs, water bodies, open green spaces and clean air embody the elements of the natural environment and create a sense of closeness to nature, contribute to the recovery of physical and moral strength [12]. Convenient location and accessibility of green areas are very important for all residents, and especially for the elderly and parents with young children [13].…”

Section: Introductionmentioning

confidence: 99%

The problems of forming a system of green areas as an ecological framework of a large city (on the example of Kyiv)

Pleshkanovska

2021

E3S Web Conf.

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Each large city is characterized by its own unique model of spatial organization of green areas, which form the ecological framework of the city and act as a condition for its balanced ecological development. The article presents results of an analysis of the actual state and preconditions for the formation of a system of green areas of public use of a large city on the example of the city of Kyiv. The model of the ecological framework of Kyiv, in comparison with the models of other European cities, is characterized. The specificity of the spatial organization of the landscaping system is marked by the presence of a powerful water-green diameter in the central part of the city, formed by the valley of the Dnipro River with islands, and a developed peripheral-ring forest park belt. The central and middle densely developed area of the city suffers from a significant lack of green areas for public use. The article formulates urban planning problems completion of the formation of an integrated ecological network of Kyiv, and outlined areas for improving the city's landscaping system.

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Comparative study of flow field and drag coefficient of model and small natural trees in a wind tunnel

Cited by 55 publications

References 49 publications

Wind speed inference from environmental flow–structure interactions

Wind speed inference from environmental flow–structure interactions

A New Methodology for Assessing the Interaction between the Mediterranean Olive Agro-Forest and the Atmospheric Surface Boundary Layer

The problems of forming a system of green areas as an ecological framework of a large city (on the example of Kyiv)

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