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- Title
Hydrological Functioning of an Evolving Urban Stormwater Network.
- Authors
Jovanovic, Tijana; Hale, Rebecca L.; Gironás, Jorge; Mejia, Alfonso
- Abstract
As complex systems, urban stormwater networks (USNs) may reveal emergent features (e.g., scaling) and sudden changes in behavior, which can lead to unanticipated impacts. We explored this through the USN properties of connectivity, heterogeneity, and scaling, which were quantified using outputs from a hydrological model and network dispersion mechanisms. The network properties were determined retrospectively in space and time by reconstructing the contemporary history of urban development and stormwater infrastructure in an arid, urban catchment in the City of Scottsdale, Arizona, USA. We found that the relative importance to USN functioning of both network structure (geomorphology) and dynamics (spatial celerity pattern) changed with the spatial scale, with network geomorphology being more dominant at larger spatial scales. The importance of network geomorphology suggested that the structure of the USN itself could potentially serve as a stormwater control measure, for example, by enhancing flow dispersion. The temporal evolution of the USN revealed a sudden change in the hydrological functioning of the network, which seemed to be a consequence of the combined effects of patchy urban development and changes in network connectivity. The interactions between the urban spatial pattern, stormwater infrastructure, and surface runoff may result in threshold‐like behavior. A spatial multiscale approach to stormwater management may be beneficial to ensure that hydrological benefits at one scale do not cause unintended consequences at another. Overall, the retrospective modeling and network analysis approach used in this study may be useful for understanding emergent urban stormwater impacts. Key Points: The dendritic structure of the urban stormwater network could serve as a stormwater control measure, for example, by enhancing flow dispersionThe temporal evolution of the urban stormwater network reveals a relatively sudden change in the hydrological functioning of the networkMultiscale approach to stormwater could prevent beneficial hydrological changes at one scale causing negative impacts at another
- Subjects
SCOTTSDALE (Ariz.); DENDRITIC crystals; URBAN planning; GEOMORPHOLOGY; SPACETIME; URBAN history
- Publication
Water Resources Research, 2019, Vol 55, Issue 8, p6517
- ISSN
0043-1397
- Publication type
Article
- DOI
10.1029/2019WR025236