Special Issue "Hydrological Performance of Green Roofs"
Deadline for manuscript submissions: closed (1 June 2018).
Interests: ecohydrology; soil physics; urban hydrometeorology; water quantity; water quality
Interests: urban hydrology and ecology; urban climate change adaptation; sustainable urban drainage systems; stormwater management; nature-based solutions to climate change in urban areas; urban green infrastructures
Urban hydrology is characterized by short lag times, low peak reduction, and low evapotranspirative losses. Whereas the hydrological problems arising in cities were initially and easily transported toward the city boundaries, there is an increasing need to formulate persistent solutions "on-site", which challenges creativity in terms of efficient use of space, but also in terms of governance. Given that climate change is expected to lead to heavier and more frequent rainstorms, the process of city densification requires strenghtening the adaptive capacity of the built environment and stimulating the search for new means of closing water cycles and increasing retention times. One such solution in temperate climates is green roofs. It now seems generally accepted that green roofs successfully retain small rainfall events, but that for the less well-studied large rainfall events green roofs need to be designed for use in combination with other measures, or to be redesigned to allow for more storage of water (so-called blue-green roofs). At the same time, green roof design criteria, such as the substrate conductivity and retention need to be reconsidered to accomodate the objective of retaining and slowly releasing water. An open question is the effect of the type of roof vegetation on the storage emptying time and water quality. Roof water management may influence vegetation and the potential of roofs to contribute to biodiversity. Slowing down the urban water cycle may have consequences on the water quality of the urban open water ecosystems. Up-scaling of blue-green roofs for a synergistic impact on the scale of cities is a challenge in terms of technology as well as—again—governance. This Special Issue aims to present to what extent knowledge on blue-green roofs is available; to what extent model and/or engineering approaches are available, and to what extent experimental evidence supports and illustrates these changing requirements.
Dr. Ir. Klaas Metselaar
Dipl. Geoecol. Michael Richter
Dr. Ir. Petra van den Berg
Manuscript Submission Information
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(decentralised) stormwater management
flow modeling, urban development
water sensitive urban design