Role of channel and floodplain cross‐section geometry in the basin response

Mejía, Alfonso; Reed, Seann

doi:10.1029/2010wr010375

Cited by 20 publications

(7 citation statements)

References 65 publications

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“…Extensive analysis has been carried out to understand and characterize dispersion mechanisms in natural catchments based on the theory of transport by travel times [1,7,17,26,27,33,35,36]. For stream networks, the approach was pioneered by [26] with the notion of geomorphological dispersion.…”

Section: Introductionmentioning

confidence: 99%

Spatial characterization of catchment dispersion mechanisms in an urban context

Rossel

Gironás

Mejía

et al. 2014

Advances in Water Resources

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Section: Introductionmentioning

confidence: 99%

Spatial characterization of catchment dispersion mechanisms in an urban context

Rossel

Gironás

Mejía

et al. 2014

Advances in Water Resources

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“…The value of the scaling exponent for 〈 L 〉 is 0.85 (Figure c). In natural stream networks, with pronounced dendritic patterns, the scaling exponent for 〈 L 〉 tends to be closer to 0.60 (Mejia & Reed, ). However, for elongated (parallel) natural networks, typical of dryland regions, the scaling exponent tends to be greater than 0.6 (Jung & Ouarda, ).…”

Section: Resultsmentioning

confidence: 99%

Hydrological Functioning of an Evolving Urban Stormwater Network

Jovanovic

Hale

Gironás

et al. 2019

Water Resources Research

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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.

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“…Initial studies were based on the hypothesis of constant wave celerity both in space and in time [ Gupta et al ., ; Rinaldo et al ., ], and subsequent efforts included flow speed variation in space, according to the river reach physical characteristics such as the slope and the cross‐section shape, but not in time [ Saco and Kumar , ; Grimaldi et al ., ; White et al ., ; Olivera and Koka , ; Li and Sivapalan , ]. It was only recently that the influence of river hydraulics, including floodplains, on the shape of the resulting hydrograph started to be considered [ Snell et al ., ; Mejia and Reed , ; Äkesson et al ., ].…”

Section: Introductionmentioning

confidence: 99%

On river-floodplain interaction and hydrograph skewness

et al. 2016

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Understanding hydrological processes occurring within a basin by looking at its outlet hydrograph can improve and foster comprehension of ungauged regions. In this context, we present an extensive examination of the roles that floodplains play on driving hydrograph shapes. Observations of many river hydrographs with large floodplain influence are carried out and indicate that a negative skewness of the hydrographs is present among many of them. Through a series of numerical experiments and analytical reasoning, we show how the relationship between flood wave celerity and discharge in such systems is responsible for determining the hydrograph shapes. The more water inundates the floodplains upstream of the observed point, the more negatively skewed is the observed hydrograph. A case study is performed in the Amazon River Basin, where major rivers with large floodplain attenuation (e.g., Purus, Madeira, and Juruá) are identified with higher negative skewness in the respective hydrographs. Finally, different wetland types could be distinguished by using this feature, e.g., wetlands maintained by endogenous processes, from wetlands governed by overbank flow (along river floodplains). A metric of hydrograph skewness was developed to quantify this effect, based on the time derivative of discharge. Together with the skewness concept, it may be used in other studies concerning the relevance of floodplain attenuation in large, ungauged rivers, where remote sensing data (e.g., satellite altimetry) can be very useful.

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Role of channel and floodplain cross‐section geometry in the basin response

Cited by 20 publications

References 65 publications

Spatial characterization of catchment dispersion mechanisms in an urban context

Spatial characterization of catchment dispersion mechanisms in an urban context

Hydrological Functioning of an Evolving Urban Stormwater Network

On river-floodplain interaction and hydrograph skewness

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