Downstream channel changes on a contracting, anabranching river: The Lachlan, southeastern Australia

Kemp, Justine

doi:10.1016/j.geomorph.2010.04.018

Cited by 54 publications

(38 citation statements)

References 51 publications

(65 reference statements)

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“…Anabranching rivers occur globally in a wide variety of environments (e.g., Rust, 1978;Schumm, 1981Schumm, , 1985Smith, 1976;Gibling et al, 1998;Goswami et al, 1999;Tooth and Nanson, 1999;Jain and Sinha, 2004;Nanson et al, 2005;Burge, 2006;Rodrigues et al, 2006;Tooth et al, 2008;Makaske et al, 2009;Kemp, 2010;Phillips, 2014) and observations in modern sedimentary environments have shown significant differences between anabranching rivers, which can be divided into separate humid and dryland types (Nanson and Knighton, 1996;North et al, 2007). Unlike humid regions with dense vegetation cover, dryland anabranching rivers are characterized by sparse vegetation, which plays an important role in channel morphodynamics of dryland anabranching rivers by changing bank strength and flow dynamics (Tooth and Nanson, 2000).…”

Section: Introductionmentioning

confidence: 99%

Dryland anabranching river morphodynamics: Río Capilla, Salar de Uyuni, Bolivia

Bristow

Lüthi

et al. 2015

Geomorphology

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Section: Introductionmentioning

confidence: 99%

Dryland anabranching river morphodynamics: Río Capilla, Salar de Uyuni, Bolivia

Bristow

Lüthi

et al. 2015

Geomorphology

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“…The climate is temperate, with rainfall averaging 370 and 780 mm per year in the western and eastern reaches, respectively (CSIRO 2008). The rainfall occurs predominantly in winter (June-August), leading to highly variable seasonal flow (Kemp 2010). Flows are highly regulated with 14 weirs plus the Wyangala Dam (,301 GL), which is located in the upper catchment.…”

Section: Catchment and Site Descriptionmentioning

confidence: 99%

“…1). This western lowland region is characterised by a shallow gradient and majority agricultural land use (Kemp 2010). There is a trend of decreasing channel size and average flow from upstream to downstream sites; for example, bankfull width is 48 m at Condobolin (S1) and 27 m at Booligal (S6) (Kemp 2010).…”

Section: Catchment and Site Descriptionmentioning

confidence: 99%

“…A hypothesis to explain this and the significant increases in BOD and carbon concentration from S5 to S6 incorporates differences in river-adjacent land use that can cause significant variations in organic carbon and disrupt longitudinal patterns in carbon Neal et al 2008). As the Lachlan River flows towards its terminus, it contracts, branches and anabranches (Kemp 2010). Unlike upstream where land use is overwhelmingly agricultural, the dominant landscape feature between S5 and S6 is a river red gum forest, the Moon Moon State Forest.…”

Section: Longitudinal Patterns In Carbon Cyclingmentioning

confidence: 99%

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Flow variability and longitudinal characteristics of organic carbon in the Lachlan River, Australia

Moran

Ganf

Wallace

et al. 2014

Mar. Freshwater Res.

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Abstract. Heterotrophic organic-carbon cycling is a major source of energy to aquatic food webs, yet there are few studies into patterns of heterotrophic productivity in large lowland rivers. The Lachlan River experienced a period of extreme flow variability from September 2010 to February 2011; for example, daily discharge (ML day À1) at one site reached .22 times its 10-year average. Heterotrophic cycling of dissolved organic carbon (DOC) and particulate organic carbon (POC) were assessed over this period at six sites on the Lachlan River. Concentrations of total organic carbon (TOC) ranged from 7 to 30 mg L À1 , of which the majority was in dissolved form. Concentration of DOC was positively correlated with daily discharge. Biochemical oxygen demand of TOC over 5 days (BOD 5 ) showed significant variability, ranging from 0.6 to 6.6 mg O 2 L À1 . BOD 5 did not appear related to discharge, but instead to a range of other factors, including regulation via weirs, lateral and longitudinal factors. Partitioning of DOC and POC showed that POC had an influence on BOD 5 comparable to DOC. This is relevant to environmental-flow management in the Lachlan River, the Murray-Darling Basin and rivers generally, by showing that flow variability influences a fundamental ecosystem characteristic, namely organic carbon.

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“…To provide clarity when determining the opportunity costs of utilizing 56 Although the Basin Plan considers the Lachlan CMR as unconnected to the rest of the Basin, the model treats the Lachlan CMR as connected. This decision was made as the confluence of Lachlan Rivers is the Murrumbidgee River (Kemp 2010) and flows do connect in wet years and unlike the Wimmera CMR, the Lachlan CMR recharges groundwater reserves that can be used by the other CMRs in the MDB (Figure 2-5). …”

Section: 9mentioning

confidence: 99%

Restoring the balance: Water reform & the Murray-Darling Basin plan

Adamson¹

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The Murray-Darling Basin Plan (Basin Plan) is tasked with improving welfare by internalizing the negative externalities derived from the past 130 years of policy development which has over allocated water resources to irrigators in Australia's MurrayDarling Basin (MDB). As water scarcity increases these welfare losses are compounded.For example, during the Millennium Drought water could not be delivered to urban communities, critical environmental flow was not provided, and the typically elastic private demand for water transformed into an inelastic demand function exposing capital investment to climatic risk.The Basin Plan utilizes the common property concept to internalize externalities by reducing the quantity of the privately held (irrigators) surface rights by 3,200 gigalitres (GL) and transferring these rights to an environmental steward. By restoring environmental flows, externalities are internalized as the environment gets a share, and the 'quality' of the water resources improves thus increasing economic welfare. To facilitate this transfer, an adjustment package has been designed that provides a net increase in groundwater and allocates over $10 billion in funding, split between two programs to purchase surface water. Some $3.1 billion has been allocated to purchase 1,500GL of property rights from irrigators while $5.8 billion has been allocated to gain 1,700GL by subsidizing investments in water use efficiency programs.Water resources in the MDB are highly variable and are characterized by floods and droughts events. This variability is expected to increase as climate change is forecast to reduce supply and increase the variability of rainfall. Consequently the long run success of the Basin Plan will be dependent on the efficiency of these alternative strategies to source surface water for the environment subject to this inherent variability and increasing uncertainty.By representing uncertainty about water supply within alternative states of nature (drought, wet and normal), the state-contingent approach (SCA) provides the capacity to examine how irrigators adapt to both the state of nature and alternative policy settings by changing inputs, production systems and transition towards opportunistically irrigating in favorable states of nature. By being able to model output and decision maker uncertainty separately, ii the SCA approach then overcomes the limitations of other decision making approaches.By setting up the Basin Plan as an optimization question, the net change in national welfare from irrigation can be examined against the assurance that the Basin Plan objectives are achieved (i.e. policy constraints of minimum flow targets and quality improvements). This provides the capacity to illustrate how alternative climate scenarios could alter the possibility of meeting the water reform objectives listed in the Basin Plan.The analysis reveals that: the increased groundwater access creates inequitable wealth for irrigators and shifts climate risk towards the environment; that the optimal...

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Downstream channel changes on a contracting, anabranching river: The Lachlan, southeastern Australia

Cited by 54 publications

References 51 publications

Dryland anabranching river morphodynamics: Río Capilla, Salar de Uyuni, Bolivia

Dryland anabranching river morphodynamics: Río Capilla, Salar de Uyuni, Bolivia

Flow variability and longitudinal characteristics of organic carbon in the Lachlan River, Australia

Restoring the balance: Water reform & the Murray-Darling Basin plan

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