Abstract
Engineered soils play an important role in urban hydrology e.g. in the functioning of green roofs and storm water bioretention beds. Water infiltration, colloid transport and heat transport are affected by changes in pore system geometry particularly due to development of macropores and clogging by particles. The rate of pedogenesis is often faster than in natural soils due to higher loads of particles as well as by extreme water regimes. In the presented project we assess the temporal changes of hydraulic properties of engineered soils in typical bioretention beds and green roofs by conducting field scale experiments. The aim is to elucidate changes in hydraulic properties by studying the structural changes of soils at the microscale by invasive and noninvasive methods. The outcomes of the research will lead to improved design and management procedures for green roofs and bioretention beds.
Highlights
IntroductionAs urbanization increases the imperviousness of watersheds, the volume of storm water reaching municipal storm sewers, and eventually streams, has increased dramatically
Intense urban population growth is associated with negative environmental effects
Low Impact Development (LID) or Water Sensitive Urban Design (WSUD) approaches [2] contribute to mitigation of these adverse effects of urbanization, by improving the retention of storm water close to its source, removing contaminants from storm water, and enhancing groundwater recharge and evapotranspiration
Summary
As urbanization increases the imperviousness of watersheds, the volume of storm water reaching municipal storm sewers, and eventually streams, has increased dramatically. As a consequence of rapid water drainage from urban areas, ground water levels drop, and the resulting lack of water available for evapotranspiration, in combination with the high proportion of impervious surfaces contributes to the development of urban heat islands [1]. Low Impact Development (LID) or Water Sensitive Urban Design (WSUD) approaches [2] contribute to mitigation of these adverse effects of urbanization, by improving the retention of storm water close to its source, removing contaminants from storm water, and enhancing groundwater recharge and evapotranspiration. Bioretention cells and green roofs are typical examples of LID approaches. The properties of the soils and substrates used in the bioretention and green roof construction are the key to the optimal LID function
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