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Letteratura scientifica selezionata sul tema "Murray-Darling River"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 21 febbraio 2023

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Articoli di riviste sul tema "Murray-Darling River"

1

Fülöp, R. H., A. T. Codilean, K. M. Wilcken, T. J. Cohen, D. Fink, A. M. Smith, B. Yang et al. "Million-year lag times in a post-orogenic sediment conveyor". Science Advances 6, n. 25 (giugno 2020): eaaz8845. http://dx.doi.org/10.1126/sciadv.aaz8845.

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Understanding how sediment transport and storage will delay, attenuate, and even erase the erosional signal of tectonic and climatic forcings has bearing on our ability to read and interpret the geologic record effectively. Here, we estimate sediment transit times in Australia’s largest river system, the Murray-Darling basin, by measuring downstream changes in cosmogenic 26Al/10Be/14C ratios in modern river sediment. Results show that the sediments have experienced multiple episodes of burial and reexposure, with cumulative lag times exceeding 1 Ma in the downstream reaches of the Murray and Darling rivers. Combined with low sediment supply rates and old sediment blanketing the landscape, we posit that sediment recycling in the Murray-Darling is an important and ongoing process that will substantially delay and alter signals of external environmental forcing transmitted from the sediment’s hinterland.

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2

Maini, N., A. Buchan e S. Joseph. "Derivation of a salinity target for the Lower Murray Darling Valley". Water Science and Technology 48, n. 7 (1 ottobre 2003): 105–12. http://dx.doi.org/10.2166/wst.2003.0430.

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The NSW Government commissioned catchment management boards (CMBs) to set the direction and process for catchment scale natural resource management. In the Lower Murray Darling, Rivers are highly regulated and water resources shared between three states. The Catchment Board only has jurisdiction over the northern bank of the Murray but salt and water enter the river from many locations upstream and along the area boundary. River salt and flow modelling has continually been improved to reflect and contribute to an increased understanding of salinity processes. The MDBC Salt Load study correlates 10 years of actual measured data with its modelled outputs, and estimates river salinities for 2020, 2050 and 2100. Routing models such as SALTFLO and MURKEY generate percentile salinity levels at different nodes in the River Murray downstream of the Lower Darling confluence. National, Murray-Darling Basin and NSW salinity management policy and legislative requirements were considered, MDBC model output was used to ensure the interim targets are achievable, auditable, and appropriate to the catchment. The method for an end-of-valley river based target for salinity is described. A target of less than 463 μS/cm for Lock 6, a point in the lower reaches of the Murray River is recommended for year 2010. Catchment management targets that express the main river salinity risk in five hydrologically distinct management zones are also recommended. Salinity management changes are needed in each zone to meet the end-of-valley target.

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3

Unmack, P. J., M. J. Young, B. Gruber, D. White, A. Kilian, X. Zhang e A. Georges. "Phylogeography and species delimitation of Cherax destructor (Decapoda: Parastacidae) using genome-wide SNPs". Marine and Freshwater Research 70, n. 6 (2019): 857. http://dx.doi.org/10.1071/mf18347.

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Cherax is a genus of 58 species of decapod crustaceans that are widespread across Australia and New Guinea. We use single-nucleotide polymorphisms (SNPs) to examine phylogeographic patterns in the most widespread species of Cherax, namely, C. destructor, and test the distinctiveness of one undescribed species, two C. destructor subspecies, previously proposed evolutionarily significant units, and management units. Both the phylogenetic analyses and the analysis of fixed allelic differences between populations support the current species-level taxonomy of C. setosus, C. depressus, C. dispar and C. destructor, the distinctiveness of C. destructor albidus and C. d. destructor and the existence of one undescribed species. The two populations of C. d. albidus from the Glenelg and Wimmera rivers were significantly distinct, with eight diagnostic differences (<1% fixed differences, null expectation is four fixed differences), but this low level of divergence is interpreted as within the range that might be expected of management units, that is, among allopatric populations of a single species or subspecies. A southern clade of C. d. destructor comprising the Murray River and its tributaries upstream from its confluence with the Darling River is genetically distinct from a northern clade comprising populations from the Lake Eyre Basin, the northern half of the Murray–Darling Basin (Darling River catchment) and the Lower Murray River below the Darling confluence.

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4

Davie, Alec W., e Joe B. Pera. "The Fish Health Risk Indicator: linking water quality and river flow data with fish health to improve our predictive capacity around fish death events". Marine and Freshwater Research 73, n. 2 (2022): 193. http://dx.doi.org/10.1071/mf20360.

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Severe drought conditions contributed to three mass fish mortality events in the Darling River near Menindee, part of the Murray–Darling Basin, Australia, during the summer of 2018–19. An independent assessment recommended the need for improved modelling approaches to identify when sections of rivers may be more susceptible to fish kill events. We present a geographic information system (GIS)-based tool that combines meteorological forecasts with river flow and algal biomass datasets to identify river reaches where additional stresses on fish health may produce an increased risk of mass fish deaths. At present the tool is still in development and will require the addition of extra datasets and testing using historical datasets to further validate its accuracy. Despite the tool being in its development stage, the decision support tool has been widely accepted and provides natural resource managers with a rapid way to understand and communicate risks to fish health, supporting improved water management options across the Murray–Darling Basin that may ultimately help reduce the frequency and severity of large-scale fish mortality events.

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5

Pittock, Jamie, e C. Max Finlayson. "Australia's Murray - Darling Basin: freshwater ecosystem conservation options in an era of climate change". Marine and Freshwater Research 62, n. 3 (2011): 232. http://dx.doi.org/10.1071/mf09319.

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River flows in the Murray–Darling Basin, as in many regions in the world, are vulnerable to climate change, anticipated to exacerbate current, substantial losses of freshwater biodiversity. Additional declines in water quantity and quality will have an adverse impact on existing freshwater ecosystems. We critique current river-management programs, including the proposed 2011 Basin Plan for Australia’s Murray–Darling Basin, focusing primarily on implementing environmental flows. River management programs generally ignore other important conservation and adaptation measures, such as strategically located freshwater-protected areas. Whereas most river-basin restoration techniques help build resilience of freshwater ecosystems to climate change impacts, different measures to enhance resilience and reoperate water infrastructure are also required, depending on the degree of disturbance of particular rivers on a spectrum from free-flowing to highly regulated. A crucial step is the conservation of free-flowing river ecosystems where maintenance of ecological processes enhances their capacity to resist climate change impacts, and where adaptation may be maximised. Systematic alteration of the operation of existing water infrastructure may also counter major climate impacts on regulated rivers.

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6

Sheldon, Fran, e Keith F. Walker. "Spatial distribution of littoral invertebrates in the lower Murray - Darling River system, Australia". Marine and Freshwater Research 49, n. 2 (1998): 171. http://dx.doi.org/10.1071/mf96062.

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The abundance and richness of macroinvertebrates in the lower Murray and Darling rivers were examined at a macroscale (rivers), mesoscale (billabongs, backwaters, channel) and microscale (vegetation, snags, substrata). In the Darling, insects dominated (85% of taxa, 81% of individuals); the richest taxa were Diptera (26 taxa) and Coleoptera (15 taxa) and the most abundant were Hemiptera (47%) and Diptera (35%). In the Murray, insects again dominated (84% of taxa, 52% of individuals), particularly Diptera (22 taxa), Coleoptera (12 taxa) and Hemiptera (9 taxa), but there were more crustaceans (9% of taxa, 47% of individuals, particularly the atyid shrimp Paratya australiensis). Both assemblages were uneven: in the Darling, >50% of biomass was Micronecta spp. (Corixidae), Dicrotendipes sp. (Chironomidae) and Macrobrachium australiense (Palaemonidae); in the Murray, 70% of biomass was P. australiensis and Caridina mccullochi (Atyidae) and the insects Micronecta spp. (Corixidae) and Chironomus sp. (Chironomidae). Abundances generally were greatest in the Murray. Hydrologic and geomorphic factors influenced assemblages at the macroscale, whereas microhabitat diversity dominated at the mesoscale.

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7

Draper, Clara, e Graham Mills. "The Atmospheric Water Balance over the Semiarid Murray–Darling River Basin". Journal of Hydrometeorology 9, n. 3 (1 giugno 2008): 521–34. http://dx.doi.org/10.1175/2007jhm889.1.

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Abstract The atmospheric water balance over the semiarid Murray–Darling River basin in southeast Australia is analyzed based on a consecutive series of 3- to 24-h NWP forecasts from the Australian Bureau of Meteorology’s Limited Area Prediction System (LAPS). Investigation of the LAPS atmospheric water balance, including comparison of the forecast precipitation to analyzed rain gauge observations, indicates that the LAPS forecasts capture the general qualitative features of the water balance. The key features of the atmospheric water balance over the Murray–Darling Basin are small atmospheric moisture flux divergence (at daily to annual time scales) and extended periods during which the atmospheric water balance terms are largely inactive, with the exception of evaporation, which is consistent and very large in summer. These features present unique challenges for NWP modeling. For example, the small moisture fluxes in the basin can easily be obscured by the systematic errors inherent in all NWP models. For the LAPS model forecasts, there is an unrealistically large evaporation excess over precipitation (associated with a positive bias in evaporation) and unexpected behavior in the moisture flux divergence. Two global reanalysis products (the NCEP Reanalysis I and the 40-yr ECMWF Re-Analysis) also both describe (physically unrealistic) long-term negative surface water budgets over the Murray–Darling Basin, suggesting that the surface water budget cannot be sensibly diagnosed based on output from current NWP models. Despite this shortcoming, numerical models are in general the most appropriate tool for examining the atmospheric water balance over the Murray–Darling Basin, as the atmospheric sounding network in Australia has extremely low coverage.

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8

Pigram, John J. "Towards Upstream-Downstream HydrosolidarityAustralia's Murray-Darling River Basin". Water International 25, n. 2 (giugno 2000): 222–26. http://dx.doi.org/10.1080/02508060008686822.

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9

Quiggin, John. "Environmental economics and the Murray–Darling river system". Australian Journal of Agricultural and Resource Economics 45, n. 1 (marzo 2001): 67–94. http://dx.doi.org/10.1111/1467-8489.00134.

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10

Gehrke, Peter C., e John H. Harris. "Large-scale patterns in species richness and composition of temperate riverine fish communities, south-eastern Australia". Marine and Freshwater Research 51, n. 2 (2000): 165. http://dx.doi.org/10.1071/mf99061.

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Riverine fish in New South Wales were studied to examine longitudinal trends in species richness and to identify fish communities on a large spatial scale. Five replicate rivers of four types (montane, slopes, regulated lowland and unregulated lowland) were selected from North Coast, South Coast, Murray and Darling regions. Fishwere sampled during summer and winter in two consecutive years with standardized gear that maximized the range of species caught. The composition of fish communities varied among regions and river types, with little temporal variation. Distinct regional communities converged in montane reaches and diverged downstream. The fish fauna can be classified into North Coast, South Coast, Murray and Darling communities, with a distinct montane community at high elevations irrespective of the drainage division. Species richness increased downstream in both North Coast and South Coast regions by both replacement and the addition of new species. In contrast, species richness in the Darling and Murray regions reached a maximum in the slopes reaches and then declined, reflecting a loss of species in lowland reaches. The small number of species is typical of the freshwater fish faunas of similar climatic regions world-wide. Fish communities identified in this study form logical entities for fisheries management consistent with the ecosystem-focused, catchment-based approach to river management and water reform being adopted in Australia.

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Più fonti

Tesi sul tema "Murray-Darling River"

1

Williams, Mark Donald. "Salinity tolerance of small fishes from the Murray-Darling river system /". Title page, contents and conclusions only, 1987. http://web4.library.adelaide.edu.au/theses/09SB/09sbw725.pdf.

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2

Boys, Craig Ashley, e n/a. "Fish-Habitat Associations in a Large Dryland River of the Murray-Darling Basin, Australia". University of Canberra. Resource, Environmental & Heritage Sciences, 2007. http://erl.canberra.edu.au./public/adt-AUC20070807.112943.

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Many aspects concerning the association of riverine fish with in-channel habitat remain poorly understood, greatly hindering the ability of researchers and managers to address declines in fish assemblages. Recent insights gained from landscape ecology suggest that small, uni-scalar approaches are unlikely to effectively determine those factors that influence riverine structure and function and mediate fish-habitat associations. There appears to be merit in using multiple-scale designs built upon a geomorphologically-derived hierarchy to bridge small, intermediate and large spatial scales in large rivers. This thesis employs a hierarchical design encompassing functional process zones (referred to hereafter as zones), reaches and mesohabitats to investigate fish-habitat associations as well as explore patterns of in-channel habitat structure in one of Australia's largest dryland river systems; the Barwon-Darling River. In this thesis, empirical evidence is presented showing that large dryland rivers are inherently complex in structure and different facets of existing conceptual models of landscape ecology must be refined when applied to these systems. In-channel habitat and fish exist within a hierarchical arrangement of spatial scales in the riverscape, displaying properties of discontinuities, longitudinal patterns and patch mosaics. During low flows that predominate for the majority of time in the Barwon-Darling River there is a significant difference in fish assemblage composition among mesohabitats. There is a strong association between large wood and golden perch, Murray cod and carp, but only a weak association with bony herring. Golden perch and Murray cod are large wood specialists, whereas carp are more general in there use of mesohabitats. Bony herring are strongly associated with smooth and irregular banks but are ubiquitous in most mesohabitats. Open water (mid-channel and deep pool) mesohabitats are characterised by relatively low abundances of all species and a particularly weak association with golden perch, Murray cod and carp. Murray cod are weakly associated with matted bank, whereas carp and bony herring associate with this mesohabitat patch in low abundance. Nocturnal sampling provided useful information on size-related use of habitat that was not evident from day sampling. Both bony herring and carp exhibited a variety of habitat use patterns throughout the die1 period and throughout their lifetime, with temporal partitioning of habitat use by juvenile bony herring and carp evident. Much of the strong association between bony herring and smooth and irregular banks was due to the abundance of juveniles (<100mm in length) in these mesohabitats. Adult bony herring (>100mm length) occupied large wood more than smooth and irregular banks. At night, juvenile bony herring were not captured, suggesting the use of deeper water habitats. Adult bony herring were captured at night and occupjed large wood, smooth bank and irregular bank. Juvenile carp (<200mm length) were more abundant at night and aggregated in smooth and irregular banks more than any other mesohabitat patch. Adult carp (>200mm length) occupied large wood during both day and night. There is a downstream pattern of change in the fish assemblage among river zones, with reaches in Zone 2 containing a larger proportion of introduced species (carp and goldfish) because of a significantly lower abundance of native species (bony herring, golden perch and Murray cod) than all other zones. In comparison, the fish assemblage of Zone 3 was characterised by a comparatively higher abundance of the native species bony herring, golden perch and Murray cod. A significant proportion of the amongreach variability in fish assemblage composition was explained at the zone scale, suggesting that geomorphological influences may impose some degree of top-down constraint over fish assemblage distribution. Although mesohabitat composition among reaches in the Barwon-Darling River also changed throughout the study area, this pattern explained very little of the large-scale distribution of the fish assemblage, with most of the variability in assemblage distribution remaining unexplained. Therefore, although mesohabitat patches strongly influence the distribution of species within reaches, they explain very little of assemblage composition at intermediate zone and larger river scales. These findings suggest that small scale mesohabitat rehabilitation projects within reaches are unlikely to produce measurable benefits for the fish assemblage over intermediate and large spatial scales in the Barwon-Darling River. This indicates the importance taking a holistic approach to river rehabilitation that correctly identifies and targets limiting processes at the correct scales. The variable nature of flow-pulse dynamics in the Barwon-Darling River creates a shifting habitat mosaic that serves to maintain an ever-changing arrangement of habitat patches. The inundation dynamics of large wood habitat described in this thesis highlights the fragmented nature of mesohabitat patches, with the largest proportion of total in-channel large wood remaining unavailable to fish for the majority of the time. At low flows there is a mosaic of large wood habitat and with increasing discharge more potential large wood habitat becomes available and does so in a complex spatial manner. What results in this dryland river is a dynamic pattern of spatio-temporal patchiness in large wood habitat availability that is seen both longitudinally among different river zones and vertically among different heights in the river channel. Water resource development impacts on this shifting habitat mosaic. Projects undertaking both fish habitat assessment and rehabilitation need to carefully consider spatial scale since the drivers of fish assemblage structure can occur at scales well beyond that of the reach. Fish-habitat associations occurring at small spatial scales can become decoupled by process occurring across large spatial scales, making responses in the fish assemblage hard to predict. As rivers become increasingly channelised, there is an urgent need to apply research such as that conducted in this thesis to better understand the role that in-channel habitats play in supporting fish and other ecosystem processes. Habitat rehabilitation projects need to be refined to consider the appropriate scales at which fish assemblages associate with habitat. Failure to do so risks wasting resources and forgoes valuable opportunities for addressing declines in native fish populations. Adopting multi-scalar approaches to understanding ecological processes in aquatic ecosystems, as developed in this thesis, should be a priority of research and management. To do so will enable more effective determination of those factors that influence riverine structure and function at the approariate scale.

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3

Jian, Jun. "Predictability of Current and Future Multi-River discharges: Ganges, Brahmaputra, Yangtze, Blue Nile, and Murray-Darling Rivers". Diss., Atlanta, Ga. : Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19777.

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Thesis (Ph.D)--Earth and Atmospheric Sciences, Georgia Institute of Technology, 2008.
Committee Chair: Judith Curry; Committee Chair: Peter J Webster; Committee Member: Marc Stieglitz; Committee Member: Robert Black; Committee Member: Rong Fu.

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4

Baumgartner, Lee Jason, e n/a. "Effects of weirs on fish movements in the Murray-Darling Basin". University of Canberra. Resource, Environmental & Heritage Sciences, 2005. http://erl.canberra.edu.au./public/adt-AUC20051129.142046.

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Dams and weirs are widely implicated in large-scale declines in both the range and abundance of aquatic fauna. Although many factors are involved, such declines are commonly attributed to the prevention or reduction of migration, reductions in available habitat, alteration of natural flow regimes and changes to physicochemical characteristics. In Australia, studies into the ecological effects of these impacts are limited, and have concentrated mainly on species of recreational and commercial importance. Subsequently, the adverse effects of dams and weirs, and suitable methods of mitigation, remain largely unknown for many other taxa. Therefore, the major aim of this thesis is to investigate the ecological effects of dam and weir construction on previously unstudied migratory assemblages of fish and macroinvertebrates in the Murray-Darling Basin. It is anticipated that the results of these studies will feed back into improved management strategies that help arrest the previously observed declines of aquatic fauna. Initially, fish communities were sampled, by boat electrofishing, from both reference sites and downstream of Balranald and Redbank weirs on the lower reaches of the Murrumbidgee River, Australia. Sampling was stratified over large spatial and temporal scales to gain a comprehensive understanding of species most affected by the presence of these two barriers. In general, the weirs obstructed fish migrations during summer and autumn and many species of small-bodied fish such as Australian smelt, western carp gudgeon, fly-specked hardyhead and crimson-spotted rainbowfish accumulated downstream of Balranald Weir. In addition, downstream accumulations of juveniles of larger-bodied species such as bony herring, common carp and goldfish were also detected. Although many previous studies had either documented or hypothesised that upstream migrating fish accumulate downstream of migration barriers, none attempted to quantify the size of such populations. Therefore, a simple but efficient method to estimate the size of migratory populations was assessed at the Balranald Weir site. The application of two commonly used estimation techniques yielded relatively reliable results for seven species that accumulated downstream of the weir. Population size estimates were greatest for most species during summer and autumn, where accumulations as high as 800 fish per day were detected. The largest calculated population size estimates, in addition to the greatest temporal variation, of any individual species was observed in bony herring. Given the simplicity of the technique and the relative accuracy of population estimates, it was concluded that these methods could easily be applied to other weirs where the size of migratory populations is of particular interest. A study investigating the effects of Yanco Weir on the diets of three migratory percichthyid species, Murray cod, trout cod and golden perch was also conducted. Observed spatial variation in a number of trophic processes strongly implicated Yanco Weir as a major contributor to increased competition among percichthyid species on the Murrumbidgee River. The greater relative abundance of percichthyids from downstream samples, combined with increases in dietary overlap and a greater percentage of empty stomachs, also suggested percichthyids may be significantly affecting the relative abundance of potential prey items such as freshwater prawns and Australian smelt. These significant changes in dietary composition were likely related to migratory behaviour, as these species accumulated downstream of the weir, and could be readily expected at other sites where passage is obstructed. It was suggested that the construction of suitable fish passage facilities would effectively reduce the probability of migratory fish accumulating and, subsequently, potential effects of dams and weirs on trophic processes. Since it was established that dams and weirs of the Murrumbidgee River were significantly affecting migratory fish communities, an innovative but relatively inexpensive fishway design, the Deelder fish lock (after Deelder, 1958), was constructed and assessed for wider application throughout the Murray-Darling Basin. The Deelder lock was effective at mitigating the effects of Balranald Weir by providing passage for a wide range of size classes and species of fish; but importantly, the structure enabled the passage of most species previously observed to accumulate downstream of the structure. Most significant was the ability of the fish lock to pass substantial numbers of small-bodied fish, which were previously not considered migratory, suggesting that these species should be considered when developing options to mitigate the effects of other dams and weirs throughout the Murray-Darling Basin. A significant finding of this study was the realisation that substantially more species and size classes of Australian native fish are migratory than previously thought. Subsequently, it is recommended that, when designing facilities to mitigate the effects of a dam or weir, the structure of the entire migratory community is considered when developing operating parameters. Various options for mitigating the effects of dams and weirs are discussed, but it was concluded that the construction of effective fishways would be the most appropriate means of restoring migration pathways to Australian native fish. A strategic approach for assessing and adaptively mitigating the effects of dams and weirs is presented and discussed.

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5

Francis, Cathy, e n/a. "A multi-scale investigation into the effects of permanent inundation on the flood pulse, in ephemeral floodplain wetlands of the River Murray". University of Canberra. Health, Design & Science, 2005. http://erl.canberra.edu.au./public/adt-AUC20061128.153926.

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Using a multi-scale experimental approach, the research undertaken in this thesis investigated the role of the flood pulse in ephemeral floodplain wetlands of the River Murray, in order to better understand the impact of river regulation (and permanent inundation) on these wetlands. An ecosystem-based experiment was conducted on the River Murray floodplain, to compare changes in nutrient availability and phytoplankton productivity in three ephemeral wetlands (over a drying/reflooding cycle) with three permanently inundated wetlands. In the ephemeral wetlands, both drying and re-flooding phases were associated with significant increases in nutrient availability and, in some cases, phytoplankton productivity. It was demonstrated that the ?flood pulse?, as described by the Flood Pulse Concept (FPC), can occur in ephemeral wetlands in dryland river-floodplain systems, although considerable variation in the nature of the pulse existed amongst these wetlands. Results of this experiment suggest that factors such as the degree of drying and length of isolation during the dry phase, the rate of re-filling, timing of re-flooding and the number of drying/re-flooding cycles may be potentially important in producing the variation observed. Permanent inundation of ephemeral wetlands effectively removed these periods of peak nutrient availability and phytoplankton productivity, resulting in continuously low levels (of nutrient availability and phytoplankton productivity). It was concluded that alteration of the natural hydrological cycle in this way can significantly reduce nutrient availability, primary production and secondary production, essentially changing the structure and function, the ecology, of these wetlands. Equally, the results of this experiment indicate that some of the changes resulting from river regulation and permanent inundation can be somewhat reversed, within a relatively short period of time, given re-instatement of a more natural hydrological regime. A mesocosm experiment was used to examine the influence of the dry phase, specifically the effect of the degree of wetland drying, on patterns of nutrient availability and primary productivity comprising the flood pulse. Compared to permanent inundation, re-flooding of completely desiccated sediments increased carbon (C) and nitrogen (N) availability while partial drying generally decreased, or had little effect on, C and N availability after re-flooding. However, degree of drying had little effect on phosphorus availability or rates of primary production measured after re-flooding, and it is possible that these two factors are related. Partial drying reduced rates of community respiration after reflooding, possibly a reflection of the reduced carbon concentrations measured in these mesocosms in this phase of the experiment. Degree of drying also influenced the macrophyte community (measured after three months of flooding), with plant biomass generally decreasing and species diversity increasing as the degree of drying increased (with the exception of complete sediment desiccation which had lasting negative effects on both macrophyte biomass and species diversity). The results of the ecosystem and mesocosm experiments were utilised, in addition to results collected from the same experiment conducted at two smaller scales (minicosms and microcosms), to assess whether the effects of hydrological regime on nutrient availability at the ?wetland? scale could be replicated in smaller-scale experiments. None of the smaller-scaled experiments included in this investigation were able to replicate the specific response to hydrological regime recorded at the ecosystem scale, however the mesocosm experiment did produce results that were more similar to those at the ecosystem scale than those produced by the mini and microcosm experiments. The results of this study indicated that extrapolation of results from small-scale experiments should be undertaken with caution, and confirmed that a multi-scale approach to ecological research is wise, where large-scale field experimentation and/or monitoring provides a check on the accuracy, and hence relevance, of conclusions reached via mesocosm experiments.

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6

Dwyer, Brian James. "Aspects of governance and public participation in remediation of the Murray-Darling Basin /". View thesis, 2004. http://library.uws.edu.au/adt-NUWS/public/adt-NUWS20060517.130206/index.html.

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Thesis (Ph.D.) -- University of Western Sydney, 2004.
"A thesis submitted for the degree of Doctor of Philosophy of the University of Western Sydney, Sydney, January 2004." Includes bibliography : leaves 359 - 369.

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7

Sharpe, Clayton P. "Spawning and Recruitment Ecology of Golden Perch (Macquaria ambigua Richardson 1845) in the Murray and Darling Rivers". Thesis, Griffith University, 2011. http://hdl.handle.net/10072/366211.

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The golden perch (Macquaria ambigua Richardson 1845) is an iconic freshwater fish native to Australia’s Murray-Darling Basin. Like many other native fishes, golden perch have suffered declines in abundance and range since European settlement as a result of overfishing, habitat destruction, and dams that impede migration and regulate flows of the Murray-Darling river system. For more than four decades it has been widely considered that flow pulses and floods are proximate stimuli for spawning, and that floods enhance recruitment to sustain golden perch populations. It has, however, been shown recently that spawning and recruitment can occur in the absence of these conditions, that strongest recruitment events can occur outside of flood periods, and that both spawning and recruitment can occur during periods of low and even zero flows – at least in the dryland rivers of the Basin’s arid zones. Despite observations of golden perch spawning and recruitment across a range of hydrological conditions and locations, much speculation exists within the literature regarding the role of flow pulses and floods in the species’ life history, as there remain few observations of spawning in the wild and even fewer ecological studies of the early life history stages. The aims of this thesis are: to examine major aspects of golden perch life history with emphasis on the role of flows as stimuli to initiate spawning; to examine the role of floodplain habitats in the species’ early life history; to refine a conceptual model of the species’ life history and key life history events; and to evaluate the utility of this model by predicting and recording the role of river regulation in disrupting key life history processes for golden perch. The reproductive ecology of golden perch was examined in the Darling River throughout 2004-2006. During this period, temporal patterns of oöcyte maturity were examined to reveal that spawning could occur at almost any time of the year in the Darling River system. Distinct differences were also examined between the stages of oöcyte maturity observed for mature-aged females at various locations along a broad spatial gradient between Wilcannia and Menindee (~300 km), to reveal a prevailing spatial pattern in the occurrence of ‘ripe’, ‘transitional’ and ‘resting’ golden perch females within this reach of the Darling River.
Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
Griffith School of Environment
Science, Environment, Engineering and Technology
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8

Job, Thomas Anthony. "A systemic investigation of coastal acid sulfate soil acidification in the River Murray Estuary, South Australia". Thesis, University of Sydney, 2020. https://hdl.handle.net/2123/23474.

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Extensive coastal acid sulfate soil (CASS) oxidation was observed in the River Murray Estuary (RME), South Australia, during an extreme drought (the Millennium Drought, 1996–2010). CASS oxidation causes significant surface water and porewater acidity, and the mobilisation of toxicants, negatively impacting proximal ecosystems and infrastructure. In this thesis I argue that the Millennium Drought acidification event provides a test case globally for how meteorological drought triggers extreme CASS oxidation, and how other variables can exacerbate the issue. I therefore present a systemic investigation of CASS acidification within the RME and identify the boundary conditions and exogenous variables that control acidification risk. Elements mobilised from oxidised CASS (Fe, Mn, Al, V, Cr, Co, Ni, Cu, Zn, Cd, Pb, and REE) are accumulating in the sediments of the RME, and spatial patterns of enrichment and REE fractionation can be used as environmental tracers of acidic drainage. Transport and accumulation of these elements is controlled by hydrodynamic and geomorphic processes in the estuary. Multiple depositional regimes apparent in the sediment record show that hydrodynamic and geomorphic processes have, however, changed during the history of the RME in response to sea-level and anthropogenic impacts, impacting the formation of CASS and the likelihood of extreme acidification within the system. Adopting a systems approach, it is apparent that the extremity of the Millennium Drought acidification event was intensified by factors other than drought, and that the triggering of extreme CASS acidification often exhibits a non-linear relationship to boundary condition changes, meaning negative impacts can be sudden and disastrous. Wave-dominated estuaries are particularly vulnerable systems, and changes predicted for an anthropogenically heated future will likely shift estuarine systems closer to thresholds where severe acidification can be expected.

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9

Clerke, Robert Bruce. "The ecology of the cane toad, Bufo marinus, on the Darling Downs of Southern Queensland and the prospects of further range expansion within the Murray-Darling River Catchment". Thesis, Queensland University of Technology, 1995.

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10

Nguyen, Duy. "An Investigation Of The Effect Of Meanders On Thermally Stratified Riverine Flow". Thesis, The University of Sydney, 2022. https://hdl.handle.net/2123/29567.

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This thesis describes the influences of meander geometrics on thermally stratified open-channel flow. Results of this study contribute toward a greater understanding of the physical characteristics of flow in riverine environments. The presence of thermal stratification due to short-wave solar heating from above inhibits mixing, resulting in oxygen stratification and accumulation of contaminants and nutrients - conditions that have been found to cause long-term damage to the ecosystems. Reduced flow rates can also lead to acute damage events such as cyanobacterial outbreaks and mass fish kills. These conditions are progressively found in nature, linearly with the recent changing in climate and global warming. Topography, precisely the geometrical aspect, is one crucial factor that influences the evolution of thermal stratification in natural rivers. Hence, it is essential to investigate the effect of geometrical parameters on the thermally stratified flow. Direct Numerical Simulation results for turbulent open-channel flow through idealized meanders with and without an internal heat source are used to investigate these effects. The computational domain was meshed using an orthogonal, curvilinear coordinate system with velocity represented using physical components on a staggered grid arrangement. For a very sharp meander, a comparison between stratified and neutral flows is carried out to investigate the distribution of secondary circulations, temperature field, vortices, and turbulence characteristics. Five different channel curvatures at a moderate sinuosity are then used to investigate the effect of curvature on the flow features, stratification, mixing, and the energy transfers between the global potential and kinetic energy reservoirs. Finally, simulation results of neutral and stratified flows at four different channel sinuosities at a moderate curvature are presented to explore the effects of meander geometry on the flow separation and boundary shear stress.

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Più fonti

Libri sul tema "Murray-Darling River"

1

Hammer, Chris. The river: A journey through the Murray-Darling Basin. Carlton, Vic: Melbourne University Press, 2011.

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2

Cry me a river: One man's journey down the Murray Darling with a kayak on wheels. Mullumbimby, N.S.W: Ebono Institute, 2009.

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3

Posselt, Steve. Cry me a river: One man's journey down the Murray Darling with a kayak on wheels. Mullumbimby, N.S.W: Ebono Institute, 2009.

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4

Parsons, Ronald H. Ships of the inland rivers: An outline history and details of all known paddle ships, barges and other vessels trading on the Murray-Darling system. Gumeracha, S.A: Gould Books, 1987.

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5

Hart, Barry, Nick Bond, Neil Byron, Carmel Pollino e Michael Stewardson. Murray-Darling River System, Australia. Elsevier, 2020.

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6

Murray-Darling River System, Australia. Elsevier, 2020.

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7

Saintilan, Neil, e Ian Overton, a cura di. Ecosystem Response Modelling in the Murray-Darling Basin. CSIRO Publishing, 2010. http://dx.doi.org/10.1071/9780643100213.

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Ecosystem Response Modelling in the Murray-Darling Basin provides an overview of the status of science in support of water management in Australia’s largest and most economically important river catchment, and brings together the leading ecologists working in the rivers and wetlands of the Basin. It introduces the issues in ecosystem response modelling and how this area of science can support environmental watering decisions. The declining ecological condition of the internationally significant wetlands of the Murray-Darling Basin has been a prominent issue in Australia for many years. Several high profile government programs have sought to restore the flow conditions required to sustain healthy wetlands, and this book documents the scientific effort that is underpinning this task. In the Southern Murray-Darling Basin, the River Murray, the Murrumbidgee River and their associated wetlands and floodplains have been the focus of the Murray-Darling Basin Authority’s ‘The Living Murray’ program, and the NSW Rivers Environmental Restoration Program. The book documents research aimed at informing environmental water use in a number of iconic wetlands including those along the Murray – the Barmah-Millewa Forest; the Chowilla Floodplain and Lindsay-Wallpolla Islands; the Coorong and Murray mouth; and the Murrumbidgee – the Lowbidgee Floodplain. Within the Northern Murray-Darling Basin, research conducted in support of the Wetland Recovery Plan and the NSW Rivers Environmental Restoration Program has improved our knowledge of the Gwydir Wetlands and the Macquarie Marshes, and the water regimes required to sustain their ecology.

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8

Simons, Margaret. Cry Me a River: The Tragedy of the Murray-Darling Basin. Black Inc., 2020.

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9

Anjali, Bhat, e World Bank, a cura di. Institutional and policy analysis of river basin management: The Murray Darling River Basin, Australia. [Washington, D.C: World Bank, 2005.

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10

Bhat, Anjali, William Blomquist, Ariel Dinar e Brian Haisman. Institutional and Policy Analysis of River Basin Management: The Murray Darling River Basin, Australia. The World Bank, 2005. http://dx.doi.org/10.1596/1813-9450-3527.

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Più fonti

Capitoli di libri sul tema "Murray-Darling River"

1

Pittock, Jamie. "Murray–Darling River Basin (Australia)". In The Wetland Book, 1–11. Dordrecht: Springer Netherlands, 2016. http://dx.doi.org/10.1007/978-94-007-6173-5_102-2.

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2

Pittock, Jamie. "Murray-Darling River Basin (Australia)". In The Wetland Book, 1887–96. Dordrecht: Springer Netherlands, 2018. http://dx.doi.org/10.1007/978-94-007-4001-3_102.

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3

Walker, K. F., R. J. Shiel e P. L. Cadwallader. "The Murray-Darling River system". In The Ecology of River Systems, 631–94. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-017-3290-1_13.

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4

Thomas, Rachael F., e Joanne F. Ocock. "Macquarie Marshes: Murray-Darling River Basin (Australia)". In The Wetland Book, 1–12. Dordrecht: Springer Netherlands, 2016. http://dx.doi.org/10.1007/978-94-007-6173-5_209-2.

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5

Gell, Peter. "The Coorong: Murray-Darling River Basin (Australia)". In The Wetland Book, 1–11. Dordrecht: Springer Netherlands, 2017. http://dx.doi.org/10.1007/978-94-007-6173-5_210-2.

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6

Thomas, Rachael F., e Joanne F. Ocock. "Macquarie Marshes: Murray-Darling River Basin (Australia)". In The Wetland Book, 1897–908. Dordrecht: Springer Netherlands, 2018. http://dx.doi.org/10.1007/978-94-007-4001-3_209.

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7

Gell, Peter. "The Coorong: Murray-Darling River Basin (Australia)". In The Wetland Book, 1909–19. Dordrecht: Springer Netherlands, 2018. http://dx.doi.org/10.1007/978-94-007-4001-3_210.

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8

Overton, Ian C., e Tanya M. Doody. "The River Murray-Darling Basin: Ecosystem Response to Drought and Climate Change". In Drought in Arid and Semi-Arid Regions, 217–34. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-6636-5_12.

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9

Brears, Robert C. "The Green Economy and the Water-Energy-Food Nexus in the Murray-Darling River Basin". In The Green Economy and the Water-Energy-Food Nexus, 311–47. London: Palgrave Macmillan UK, 2017. http://dx.doi.org/10.1057/978-1-137-58365-9_11.

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10

Carmody, Emma. "The Unwinding of Water Reform in the Murray-Darling Basin: A Cautionary Tale for Transboundary River Systems". In Reforming Water Law and Governance, 35–55. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-8977-0_2.

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Atti di convegni sul tema "Murray-Darling River"

1

Marohasy, J., e J. Abbot. "Deconstructing the native fish strategy for Australia’s Murray Darling catchment". In RIVER BASIN MANAGEMENT 2013. Southampton, UK: WIT Press, 2013. http://dx.doi.org/10.2495/rbm130281.

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2

Doody, T., e I. Overton. "Environmental management of riparian tree health in the Murray-Darling Basin, Australia". In RIVER BASIN MANAGEMENT 2009. Southampton, UK: WIT Press, 2009. http://dx.doi.org/10.2495/rm090181.

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3

Abbot, J., e J. Marohasy. "Forecasting of monthly rainfall in the Murray Darling Basin, Australia: Miles as a case study". In RIVER BASIN MANAGEMENT 2015. Southampton, UK: WIT Press, 2015. http://dx.doi.org/10.2495/rm150141.

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4

Ma, Jianqin, Yaowu Ren e Liu Jie. "Research on Water Management Institution Comparison between the Yellow River Basin and Murray-Darling Basin in Australia". In 2011 International Conference on Computer Distributed Control and Intelligent Environmental Monitoring (CDCIEM). IEEE, 2011. http://dx.doi.org/10.1109/cdciem.2011.158.

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5

Yang, Yu. "From decentralized autonomy to central governance: case of Murray-Darling River Basin and its implication for the governance of Tai Lake Basin". In 2009 International Conference on Management Science and Engineering (ICMSE). IEEE, 2009. http://dx.doi.org/10.1109/icmse.2009.5317664.

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