Hydraulic geometry of New Zealand rivers and its use as a preliminary method of habitat assessment

Jowett, Ian G.

doi:10.1002/(sici)1099-1646(1998090)14:5<451::aid-rrr512>3.0.co;2-1

Cited by 109 publications

(103 citation statements)

References 21 publications

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“…Bollin-Dean (Knighton, 1975) 0.12 0.12 0.40 0.10 3.33 12 Midwest, USA (Leopold and Maddock, 1953) 0.26 0.16 0.40 0.17 1.54 20 Brandywine Creek (Wolman, 1955) 0.04 0.03 0.41 0.05 10.25 7 Ephemeral streams, USA (Leopold and Miller, 1956) 0.25 0.10 0.41 0.14 1.65 10 White River (Fahnestock, 1963) 0.38 0.33 0.87 112 channels Rio Manati (Lewis, 1969) 0.17 0.11 0.33 0.10 1.94 10 New Zealand (Jowett, 1998) 0.18 73 reaches France (Lamouroux and Capra, 2002) 0.13 0.05 58 reaches France (Lamouroux and Souchon, 2002) 0.13 0.05 28 reaches Australia/England (Stewardson, 2005) 0 The ratio δ/ω is the exponent of the corresponding power law cross section (Eq. (7)).…”

Section: Hydraulic Geometry Of Taiwanese Riversmentioning

confidence: 99%

Hydraulic geometry, river sediment and the definition of bedrock channels

et al. 2008

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Section: Hydraulic Geometry Of Taiwanese Riversmentioning

confidence: 99%

Hydraulic geometry, river sediment and the definition of bedrock channels

et al. 2008

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“…River width and depth play a vital role in CO 2 and nutrient exchange (Butman and Raymond, 2011;Alexander et al, 2000;Wollheim et al, 2006;Peterson et al, 2001). Aquatic habitat distribution is partially dependent on channel geometry, which both influences the spatial extent of habitats and acts as a barrier to terrestrial species migration (Jowett, 1998;Newson and Newson, 2000;Ayres and Clutton-Brock, 1992;Hayes and Sewlal, 2004). Humans depend on accurate assessments of river form for understanding flooding hazards, transportation planning, and fisheries management (Hobley et al, 2012;Apel et al, 2009;McCartney, 1986;Troitsky, 1994;Prevost et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Quantifying river form variations in the Mississippi Basin using remotely sensed imagery

Miller

Pavelsky

Allen

2014

Hydrol. Earth Syst. Sci.

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Abstract. Geographic variations in river form are often estimated using the framework of downstream hydraulic geometry (DHG), which links spatial changes in discharge to channel width, depth, and velocity through power-law models. These empirical relationships are developed from limited in situ data and do not capture the full variability in channel form. Here, we present a data set of 1.2 × 10 6 river widths in the Mississippi Basin measured from the Landsat-derived National Land Cover Dataset that characterizes width variability observationally. We construct DHG for the Mississippi drainage by linking digital elevation model (DEM)-estimated discharge values to each width measurement. Welldeveloped DHG exists over the entire Mississippi Basin, though individual sub-basins vary substantially from existing width-discharge scaling. Comparison of depth predictions from traditional depth-discharge relationships with a new model incorporating width into the DHG framework shows that including width improves depth estimates by, on average, 24 %. Results suggest that channel geometry derived from remotely sensed imagery better characterizes variability in river form than do estimates based on DHG.

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“…Leopold and Maddock (1953) present two interpretations of HG including at-a-station hydraulic geometry (AHG) which describes how channel form adjusts to changes in the instantaneous discharge at a channel cross-section, and downstream hydraulic geometry (DHG) which describes how channel form varies in the along-stream direction with discharge of a common frequency such as the mean annual discharge. Gleason (2015) provides a review of HG studies and notes that several "Non-Leopoldian" HG relationships have also been developed including At-Many-Station HG (AMHG) introduced by Gleason and Smith (2014) which characterizes the longitudinal variability in AHG exponents and coefficients, and reach-average hydraulic geometry (RHG) first introduced by Jowett (1998) which uses reach-averaged flow attributes instead of cross-sectional data. For this study, Platte hydraulic model outputs are utilized to study the relationship between BR channel form with a changing hydrograph of the September 2013 highflow event.…”

Section: Hydraulic Geometry Analysismentioning

confidence: 99%

Metric-Resolution 2D River Modeling at the Macroscale: Computational Methods and Applications in a Braided River

2015

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Metric resolution digital terrain models (DTMs) of rivers now make it possible for multi-dimensional fluid mechanics models to be applied to characterize flow at fine scales that are relevant to studies of river hydraulic geometry (HG) and ecological habitat, or microscales. These developments are important for managing rivers because of the potential to better understand system dynamics, anthropogenic impacts, and the consequences of proposed interventions. However, the data volumes and computational demands of microscale river modeling have largely constrained applications to small multiples of the channel width, or the mesoscale. This report presents computational methods to extend a microscale river model beyond the mesoscale to the macroscale, defined as large multiples of the channel width. A method of automated unstructured grid generation is presented that automatically clusters fine resolution cells in areas of curvature (e.g., channel banks), and places relatively coarse cells in areas lacking topographic variability. This overcomes the need to manually generate breaklines to constrain the grid, which is painstaking at the mesoscale and virtually impossible at the macroscale. The method is applied to a braided river (BR) and shown to yield an efficient fine resolution model. The sensitivity of model output to grid design and resistance parameters is also examined based on analysis of hydrology, HG, and river hydraulic habitats and the findings reiterate the importance of model calibration and validation.

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Hydraulic geometry of New Zealand rivers and its use as a preliminary method of habitat assessment

Cited by 109 publications

References 21 publications

Hydraulic geometry, river sediment and the definition of bedrock channels

Hydraulic geometry, river sediment and the definition of bedrock channels

Quantifying river form variations in the Mississippi Basin using remotely sensed imagery

Metric-Resolution 2D River Modeling at the Macroscale: Computational Methods and Applications in a Braided River

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