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The term Urban Greening tend to indicate a fundamental element of the built environment in relation to the landscape. It is a connective element of the urban, with structural and functional role, including the green spaces that describe a composite network formed by parks, gardens, paths and walking trails, areas for sport and play, urban gardens, areas of policy constraints and not feasible. A network is not always constant, which stands in close connection with the built, or it can enter into a relationship with the landscape natural to identify specific areas of respect or protection. The presence of an open green space is a constant in the history of urbanization in all cultures, East and West, although through successive centuries have considerable differences in accordance ee have profoundly modified some uses.Related to the concept of sacred antiquity, a place of contemplation and meditation in the Middle Ages, but also a place of marvels reserved for the exclusive pleasure of aristocratic owners, the green spaces have become a component in the nineteenth century urban decor and toilet, open with the public use for recreational purposes, up to now accommodate more and more extended use, but still faces the collective well-being guided by a vision of aesthetics. The expansion of the functions assigned to them highlights a diversity of approaches and intent where: -living ecological sensitivity-enhancement needs; -the opportunity to recover or reuse the abandoned predominates on the creation of new land; -the rediscovery of the species is accompanied by local experiments of new technologies applied to artificial materials. In modern urban plans and projects, the materials of spazioverde have played multiple roles. In systems of parks designed by the great American cities Olmestead, Parisian Haussmann's projects, projects of the '30s and The Wright Corbusier, project for the Amsterdam Van Eesteren, a vast apparatus of green materials has contributed to the formation of the modern city. Isolated or forming continuous systems have been used with medical duties and decorum, they measured and ordered a new city and the existing organizing new geometries of central places, constituting the backbone infrastructure networks for cities growing and changing. The green materials also contributed to costruzionedell'immagine of the modern metropolis. -In the contemporary-design green spaces can take a wide variety of interscalari size, from small interstitial areas extended to include portions of territory. They tend to be integrated with other facilities and public spaces, linked by pedestrian and cycle paths, large boulevards, street-park, and can be described by categories of use that reference to the dwelling, the neighborhood, the neighborhood, the urban and territorial dimension. In Anglo-Saxon countries the discipline that is concerned with the urban green spaces is known as urban forestry, (literally: "urban forest"), almost indicate how the green spaces can act as a rural oasis within the urban areas, with a focus on green wilderness areas included in a "dry" built. The Function of Urban Greening:
1) funzione ecologico-ambientale:the green, even within urban areas, there is a fundamental element of ecological and environmental, that contribute substantially to mitigate the effects and impacts of degradation products from the presence of buildings and by human activities. Among other things, the presence of green helps to regulate the effects of microclimate by increasing citizen evapotranspiration, the peak summer thermal regime as a kind of effect of "conditioning" natural air. 2) funzione sanitaria:in certain urban areas, particularly near hospitals, the presence of green contributes to the creation of a environment that can facilitate the recovery of patients, both in the presence of aromatic and balsamic, both for the effect of mitigation of the microclimate, and also for the psychological effect produced by the sight of a green relaxing well maintained. 3) funzione protettiva: green can make a significant protective effect and protection of degraded land areas or sensitive (levees rivers, slopes, landslide hazard areas, etc.), and conversely its removal in certain cases can produce appreciable effects of decay and collapse Territorial. 4) funzione sociale e ricreativa: the presence of parks, gardens, tree-lined avenues and squares with or otherwise furnishing Green can meet an important recreational and social needs and provide a vital service to the community, making it more livable and size of the men and families in a city. In addition, the management of green may allow the formation of specific skills and foster the creation of jobs. 5) funzione igienica: green areas play an important psychological function and humoral immunity to people who actually receive it, contributing to the psychological well-being and mental balance. 6) funzione culturale e didattica: the presence of the green is a matter of great importance from the cultural point of view, both because it can promote the knowledge of botany and natural sciences in general and the environment among citizens, is also an important educational function (in particular the green school) for the new generations. In addition, historic parks and gardens, as well as specimens of plant age or size, are the true monuments natural, whose conservation and protection are among the cultural objectives of our social forum. 7) funzione estetico-architettonica: also feature architectural aesthetic is relevant, given that the presence of the green greatly improves the urban landscape and makes it more pleasant to stay in town, so it becomes crucial promote integration between architectural elements and green in the design of furniture urban environment.