A comparison of morphometric measures of bankfull

Riley, S. J.

doi:10.1016/0022-1694(72)90064-9

Cited by 78 publications

(38 citation statements)

References 6 publications

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“…A first category of definitions is based on recognition of the geomorphic features in the field, such as a break in the channel bank's slope (Leopold et al, 1964;Harrelson et al, 1994;Castro and Jackson, 2001;Dury, 1961;Andrews, 1980;Hupp and Osterkamp, 1996). A second category requires surveyed cross-sections and consists in applying a geometric criterion to identify the bankfull elevation (Wolman, 1955;Harvey, 1969;Pickup and Warner, 1976;Richards, 1982;Carling, 1988;Riley, 1972;Williams, 1978). Definitions based on a change in sediment or vegetation composition (Speight, 1965;Woodyer, 1968;Radecki-Pawlik, 2002) also exist, but are quite removed from morphological characteristics, and have been criticized for their lack of consistency within the same reach and between reaches (Riley, 1972).…”

Section: Determination Of Bankfull Discharge Magnitudementioning

confidence: 98%

“…A second category requires surveyed cross-sections and consists in applying a geometric criterion to identify the bankfull elevation (Wolman, 1955;Harvey, 1969;Pickup and Warner, 1976;Richards, 1982;Carling, 1988;Riley, 1972;Williams, 1978). Definitions based on a change in sediment or vegetation composition (Speight, 1965;Woodyer, 1968;Radecki-Pawlik, 2002) also exist, but are quite removed from morphological characteristics, and have been criticized for their lack of consistency within the same reach and between reaches (Riley, 1972). Williams (1978) showed that different morphologically based definitions applied to the same reach lead to highly variable bankfull discharge estimations and associated recurrence interval.…”

Section: Determination Of Bankfull Discharge Magnitudementioning

confidence: 99%

“…All study reaches were Williams (1978) Significant change in the relation between the wetted area and the top channel width. RIL Riley (1972) First maximum local bank slope (Riley Bench Index Ri), from upper to lower elevation. self-formed single-thread channel reaches with mobile gravel beds, stable banks and well-defined floodplains along at least one side of the channel.…”

Section: Study Reachesmentioning

confidence: 99%

“…The bankfull discharge corresponds to the river level just before it starts to flow out of its main channel and over its floodplain (Wolman and Leopold, 1957;Kilpatrick and Barnes, 1964;Riley, 1972;Pickup and Reiger, 1979;Williams, 1978;Harrelson et al, 1994;McCandless and Everett, 2002).…”

Section: Introductionmentioning

confidence: 98%

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Determination of bankfull discharge magnitude and frequency: comparison of methods on 16 gravel‐bed river reaches

Navrátil¹,

Albert²,

Herouin³

et al. 2006

Earth Surf Processes Landf

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International audienceBankfull discharge is identified as an important parameter for studying river morphology, sediment motion, flood dynamics and their ecological impacts. In practice, the determination of this discharge and its hydrological characteristics is not easy, and a choice has to be made between several existing methods. To evaluate the impact of the choice of methods, five bankfull elevation definitions and four hydrological characterizations (determination of duration and frequency of exceedance applied to instantaneous or mean daily data) were compared on 16 gravel-bed river reaches located in France (the catchment sizes vary from 10 km2 to 1700 km2). The consistency of bankfull discharge estimated at reach scale and the hydraulic significance of the five elevation definitions were examined. The morphological definitions (Bank Inflection, Top of Bank) were found more relevant than the definitions based on a geometric criterion. The duration of exceedance was preferred to recurrence intervals (partial duration series approach) because it is not limited by the independency of flood events, especially for low discharges like those associated with the Bank Inflection definition. On average, the impacts of the choice of methods were very important for the bankfull discharge magnitude (factor of 1·6 between Bank Inflection and Top of Bank) and duration of exceedance or frequency (respectively a factor 1·8 and 1·9 between mean daily and instantaneous discharge data). The choice of one combination of methods rather than another can significantly modify the conclusions of a comparative analysis in terms of bankfull discharge magnitude and its hydrological characteristics, so that one must be cautious when comparing results from different studies that use different methods

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Section: Determination Of Bankfull Discharge Magnitudementioning

confidence: 98%

Section: Determination Of Bankfull Discharge Magnitudementioning

confidence: 99%

Section: Study Reachesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

See 2 more Smart Citations

Determination of bankfull discharge magnitude and frequency: comparison of methods on 16 gravel‐bed river reaches

Navrátil¹,

Albert²,

Herouin³

et al. 2006

Earth Surf Processes Landf

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show abstract

“…width/depth ratio [Wolman 1955], the first maximum of the bench index [Riley 1972], crosssectional area and channel width relationship [Williams 1978], bank sediment parameters [Leopold and Skibitzke 1967], vegetation cover [Schumm 1960, Williams 1978 or specific invertebrates occurrence [RadeckiPawlik and Skalski 2008]. RadeckiPawlik [2002] provided comprehensive report of the application of several methods in mountain gravel-bed channels and pointed up, that rather a certain range of discharges should be defined as the bankfull condition.…”

Section: Introductionmentioning

confidence: 99%

Bankfull widths in steep headwaters of the flysch Carpathians

Galia

Škarpich

2015

ASP FC

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abstract. Bankfull widths of steep headwater channels were examined in the Western Carpathian flysch midmountains. The criteria of the top of banks, scoured lines and pre sence of bank vegetation were helpful in the bankfull width determination. A direct downstream relationship between the parameters of the bankfull width and the watershed area and a negative downstream relationship between the parameters of the bankfull width and the channel gradient were observed in all examined channels similarly to lower gradient rivers. However, streams based in more resistant sandstone flysch and/or influenced by small debrisflows indicated much less dependence between these parameters. Significant differences in bankfull widths were found when channels of the same watershed areas, but located on leeward and windward hillslopes were compared.

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On the equilibrium profile of river beds

2014

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[1] Despite the wide spectrum of perturbations of flow and sediment transport experienced by rivers as a result of hydrologic variations, the paradigm of morphodynamic equilibrium has long been present in the geomorphological literature where it is traditionally associated with the semiempirical notion of formative discharge, whereby the unsteady forcing is taken as morphologically equivalent to some effective steady forcing. Here we investigate the mechanisms responsible for maintaining a quasi-equilibrium bed profile of a river reach sufficiently short to have no significant tributary inputs. More importantly, we assume the channel banks to be fixed, hence, the case we have in mind is that of rivers protected by levees which cannot respond to hydrologic forcing by changing their width like natural rivers. Employing a 1-D model of river morphodynamics, we first determine the equilibrium profile of the river reach for given steady forcing conditions and discuss the capability of this approach for interpreting bed profiles observed in the field by applying it to the terminal reach of the Magra River, Italy. Field observations turn out to be reasonably well fitted by the equilibrium profile associated with a steady effective discharge, which however differs from the typical formative discharge (mean annual flood) for natural channels with erodible banks. Finally, we clarify how fluctuations of the hydrodynamic forcing associated with the recorded historical sequence of hydrologic events of variable intensities have acted to maintain the river equilibrium.

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A comparison of morphometric measures of bankfull

Cited by 78 publications

References 6 publications

Determination of bankfull discharge magnitude and frequency: comparison of methods on 16 gravel‐bed river reaches

Determination of bankfull discharge magnitude and frequency: comparison of methods on 16 gravel‐bed river reaches

Bankfull widths in steep headwaters of the flysch Carpathians

On the equilibrium profile of river beds

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