The effect of altered flow regime on the frequency and duration of bankfull discharge: Murrumbidgee River, Australia

Page, Kenneth; Read, Arthur; Frazier, Paul; Mount, Nick J.

doi:10.1002/rra.828

Cited by 73 publications

(73 citation statements)

References 28 publications

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“…However, the previous approaches are generally conducted with mean daily discharge data because of their availability over longer periods of time (Petit and Pauquet, 1997;Sweet and Geratz, 2003;Page et al, 2005). As the choice of data used could significantly modify the estimations of bankfull hydrological characteristics, its influence has to be examined.…”

Section: Determination Of Bankfull Discharge Frequency and Durationmentioning

confidence: 99%

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 Frequency and Durationmentioning

confidence: 99%

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

“…Specific ecological responses have not been predicted from the changes observed, however, it is possible to postulate the types of effects that might result from the predicted changes based on previous studies. Modification of mean annual flows, high flows and high flow spells would suggests changes to primary production (Robertson et al 2001), floodplain connections (Bunn and Arthington 2002;Page et al 2005;Frazier and Page 2006) and riparian vegetation (Poff and Zimmerman 2010). Changes to the low flow spells suggests changes to the availability of habitat (Bunn and Arthington 2002) and the ability for fish to migrate to spawn (Freeman et al 2001).…”

Section: Discussionmentioning

confidence: 99%

The effects of climate change on ecologically-relevant flow regime and water quality attributes

Dyer

Elsawah

Croke

et al. 2013

Stoch Environ Res Risk Assess

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The management of freshwater ecosystems is usually targeted through the regulation of water quantity (limiting diversions and providing environmental flows) and regulation of water quality (setting limits or targets for constituent concentrations). Climate change is likely to affect water quantity and quality in multiple ways and the future management of freshwater ecosystems requires predictions of plausible future conditions. We use a suite of ecologically-relevant hydrological indicators to determine the significance of projected climate-driven hydrological changes in the Upper Murrumbidgee River Catchment in south eastern Australia in relation to river regulation. We also determine the possible water quality changes (in relation to guidelines for aquatic ecosystem protection) associated with the climate change projections to identify the combined effects of hydrological and water quality changes. The results of this study suggest that river regulation has resulted in greater changes to ecologically-relevant streamflow characteristics than climate change scenarios that involve a 1 and 2°C temperature rise in the Upper Murrumbidgee River Catchment. In contrast to the projected hydrological changes, Bayesian Network modelling suggests very small changes to violations of water quality thresholds designed to protect aquatic ecosystems as a result of climate change. By identifying key components of the flow and water quality regimes that may be affected by climate change, we are able to provide managers with information that assists in developing adaptation initiatives.

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“…Their dependence on adjacent river channels for hydrological and ecologic inputs renders them susceptible to regional changes within the watershed. River flow regime may be changed due to decreased precipitation, increased temperature and human activities in the watershed, such as dam construction, stream channelization, river embankment, flow regulation, and water extraction (Poff et al, 1997;Molles et al, 1998;Davis and Froend, 1999;Page et al, 2005). Variation in connectivity dynamics may lead to degradation of wetland functions and shrinkage of wetland areas, ultimately cause a specific wetland to be replaced by other landscape elements (Galat et al, 1998;Davis and Froend, 1999;Mitsch and Gosselink, 2000;Reckendorfer et al, 2006).…”

Section: Introductionmentioning

confidence: 96%

Temporal variation of over‐bank flooding of Wei River and its impact on a riparian wetland in Xi'an, China

Tian

Luo

Jia

et al. 2010

Hydrological Processes

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Abstract:Over-bank flooding is one of the driving forces controlling ecological integrity of riparian wetlands. Indentifying natural overbank flooding regime and its temporal variations is crucial for developing conservation and restoration plans and making water resources management policies for these ecosystems. Along the midstream of the Wei River in Xi'an, China lies the Jingwei riparian wetland, which was well preserved until the 1970s. Based on historical record of hydrological and morphological data of the Wei River from 1951 to 2000, we analysed temporal variations of over-bank flooding frequency, duration, and timing in this paper. The natural annual over-bank flooding regime was identified as having an occurrence frequency of 2Ð2 times a year and average duration of 5Ð3 days; these flooding events typically occur between June and September with occasional occurrence in late spring and late autumn. Over-bank flooding occurrence frequency and duration decreased significantly during the 1990s, seasonal events of over-bank floods were changed through reduced flooding frequency during summer and disappearing flooding events in late spring and late autumn. Further investigations showed that reduced discharge in the Wei River was the principal cause for these changes in over-bank flooding dynamics. Our analysis also showed that decreased discharge of the Wei River during the 1990s was attributed near equally to disturbances from human activities and decreased regional precipitation. Results from this study may help reestablish natural over-bank flooding dynamics in order to ensure successful restoration of Jingwei riparian wetland.

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The effect of altered flow regime on the frequency and duration of bankfull discharge: Murrumbidgee River, Australia

Cited by 73 publications

References 28 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

The effects of climate change on ecologically-relevant flow regime and water quality attributes

Temporal variation of over‐bank flooding of Wei River and its impact on a riparian wetland in Xi'an, China

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