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Missouri University of Science and Technology (2020)

Soil-water-energy nexus of green roofs

Bartels, Katherine Ann

Titre : Soil-water-energy nexus of green roofs

Auteur : Bartels, Katherine Ann

Université de soutenance : Missouri University of Science and Technology

Grade : M.S. in Environmental Engineering 2020

Résumé
As the urban landscape continues to sprawl into previously undeveloped land to accommodate population growth, the need to design cities that effectively manage urban stormwater is imperative for a sustainable future. Green roofs use rain-harvesting techniques to reduce urban stormwater discharge while simultaneously providing traditional roof services as well as several ecosystem services. However, green roof media design varies greatly among commercial applications, and little guidance is available to engineers when selecting the media for prospective green roofs. Efforts to maximize stormwater retention and enhance urban heat island mitigation capabilities of green roofs while concurrently reducing nutrient loading were examined in this research by investigating the soil-water-energy nexus of green roof media design. Two commercially available green roof media, Arkalyte and GAF, were investigated with hydrogel amended and non-amended conditions to compare the thermal and hydraulic properties of green roof media in field and lab applications to determine performance under different climatic conditions. Concentrations of total nitrogen, total organic carbon, and total phosphorous in green roof leachate decreased due to the addition of hydrogel amendments to green roof media in the in-vitro investigation. The hydrogel amendment increased field capacity green roof media by 4% to 26% in the field application of this research ; however, hydrogel did not substantially impact the rate at which water was evapotranspired, indicating greater evapotranspiration can be achieved while concurrently decreasing stormwater runoff, through media amendment approaches

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