Bibliografie tematiche / Lower Murrumbidgee

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Letteratura scientifica selezionata sul tema "Lower Murrumbidgee"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 1 febbraio 2022

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Articoli di riviste sul tema "Lower Murrumbidgee"

Hogg, ID, e RH Norris. "Effects of runoff from land clearing and urban development on the distribution and abundance of macroinvertebrates in pool areas of a river". Marine and Freshwater Research 42, n. 5 (1991): 507. http://dx.doi.org/10.1071/mf9910507.

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We examined the effects of runoff from urban land clearing and development on the macroinvertebrate pool fauna of the Murrumbidgee River, Australia, over 1 year. Tuggeranong Creek, which flows through the urban development, often recorded higher instantaneous (storm) discharges than did the Murrumbidgee River. Monitoring of suspended solids during one storm event revealed high concentrations of suspended solids (max. 560 mg L-1) entering the Murrumbidgee River for an 8 h period. Such concentrations were not detected by regular two-monthly sampling, although concentrations were generally higher downstream of Tuggeranong Creek. Analysis of substratum particle size revealed a higher proportion of fine inorganic material (<250 pm) at stations downstream of Tuggeranong Creek, suggesting a settling of fine material discharged during storm events. Number of taxa and macroinvertebrate density were lower at downstream stations. We conclude that the deposition of fine inorganic sediment following storm events, and the resulting change in the composition of the substratum, was the major cause of low invertebrate numbers in pools downstream of the cleared catchment.

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Kingsford, R. T., e R. F. Thomas. "Use of satellite image analysis to track wetland loss on the Murrumbidgee River floodplain in arid Australia, 1975-1998". Water Science and Technology 45, n. 11 (1 giugno 2002): 45–53. http://dx.doi.org/10.2166/wst.2002.0378.

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Demonstrating the extent of wetland loss and its causes are essential for policy makers and managers. We used Landsat satellite imagery to show major wetland loss in the Lower Murrumbidgee floodplain on the Murrumbidgee River in arid Australia. Stratification of the floodplain according to hydrology, use of imagery from the same time of year and the separation of developed areas, using ancillary information were essential. There was considerable loss of floodplain area over a 23 year period (1975-1998), mainly in the Nimmie-Caira stratum (59% loss), as wetland areas were replaced by irrigation bays. There was also a significant increase in fragmentation. For floodplain areas distant from the river, flooding patterns were more difficult to identify because of infrequent flooding and primary reliance on rainfall. Landsat imagery provided a powerful tool for demonstrating long-term changes in wetland area, even in highly variable environments. Such information can demonstrate the ecological costs of water resource development on floodplains, forming a basis for policy and management of rivers.

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Vink, S., M. Bormans, P. W. Ford e N. J. Grigg. "Quantifying ecosystem metabolism in the middle reaches of Murrumbidgee River during irrigation flow releases". Marine and Freshwater Research 56, n. 2 (2005): 227. http://dx.doi.org/10.1071/mf04187.

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The relative importance of floodplain carbon inputs and in-stream metabolic processes have not been well quantified in major Australian rivers. We quantified seasonal phytoplankton primary production and net ecosystem production during irrigation flow regimes at four sites each located ~100 km apart in the middle Murrumbidgee River. During flow periods dominated by storage release, ecosystem gross primary productivity, system respiration and phytoplankton chlorophyll concentrations all increased downstream so that overall net ecosystem metabolism was strongly net heterotrophic upstream and closer to balanced downstream. Phytoplankton production dominated ecosystem production throughout the entire reach and was likely to have been phosphorus limited throughout the study. Additionally, phytoplankton biomass was limited by short residence times at the upstream sites and nitrogen limited downstream in summer, despite an increase in turbidity. Both production and respiration rates were generally lower in winter, as expected, owing to lower temperatures.

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Lindley, I. D. "Acanthodian fish remains from the Lower Devonian Cavan Bluff Limestone (Murrumbidgee Group), Taemas district, New South Wales". Alcheringa: An Australasian Journal of Palaeontology 24, n. 1 (gennaio 2000): 11–35. http://dx.doi.org/10.1080/03115510008619520.

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Timms, W., e R. I. Acworth. "Origin, lithology and weathering characteristics of Upper Tertiary ‐ Quaternary clay aquitard units on the Lower Murrumbidgee alluvial fan". Australian Journal of Earth Sciences 49, n. 3 (giugno 2002): 525–37. http://dx.doi.org/10.1046/j.1440-0952.2002.00936.x.

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Wen, Li, Kerrylee Rogers, Joanne Ling e Neil Saintilan. "The impacts of river regulation and water diversion on the hydrological drought characteristics in the Lower Murrumbidgee River, Australia". Journal of Hydrology 405, n. 3-4 (agosto 2011): 382–91. http://dx.doi.org/10.1016/j.jhydrol.2011.05.037.

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Llewellyn, L. C. "Movements of Golden PerchMacquaria ambigua(Richardson) in the mid Murray and lower Murrumbidgee Rivers (New South Wales) with notes on other species". Australian Zoologist 37, n. 2 (gennaio 2014): 139–56. http://dx.doi.org/10.7882/az.2013.014.

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Wen, Li, Kerrylee Rogers, Neil Saintilan e Joanne Ling. "The influences of climate and hydrology on population dynamics of waterbirds in the lower Murrumbidgee River floodplains in Southeast Australia: Implications for environmental water management". Ecological Modelling 222, n. 1 (gennaio 2011): 154–63. http://dx.doi.org/10.1016/j.ecolmodel.2010.09.016.

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James, DG. "Energy Reserves, Reproductive Status and Population Biology of Overwintering Biprorulus-Bibax (Hemiptera, Pentatomidae) in Southern New-South-Wales Citrus Groves". Australian Journal of Zoology 38, n. 4 (1990): 415. http://dx.doi.org/10.1071/zo9900415.

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Information is presented on energy reserves, reproductive status and population biology of over- wintering Biprorulus bibax (Breddin) in southern New South Wales citrus groves. Large numbers of adult bugs overwintered in clusters on orange trees adjacent to a lemon grove at Cudgel in the Murrumbidgee Irrigation Area (M.I.A.). Clusters of up to 50 tightly packed bugs were found on single trees, and dispersed into the adjacent lemons in early October. Clustering was observed on all citrus except lemon. Overwintering bugs were non-reproductive. Individuals obtained from overwintering clusters at Dareton in Sunraysia were larger, heavier and contained greater lipid reserves than bugs which overwintered alone. These differences did not occur in cluster and non-cluster bugs from the M.I.A. Bugs overwintering on lemons in the M.I.A. weighed less and contained lower reserves of lipid than did individuals which overwintered on orange, mandarin and grapefruit. Lipid reserves of B. bibax were not greatly depleted during overwintering. Overwintering in clusters on citrus hosts other than lemon appears to be an important and successful behavioural strategy for B. bibax in commercial citrus groves in southern New South Wales.

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Briggs, Sue V., Nicola M. Taws, Julian A. Seddon e Bindi Vanzella. "Condition of fenced and unfenced remnant vegetation in inland catchments in south-eastern Australia". Australian Journal of Botany 56, n. 7 (2008): 590. http://dx.doi.org/10.1071/bt08046.

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Considerable areas of remnant native vegetation have been fenced in the last decade to manage grazing by domestic stock. This study investigated vegetation condition in comparative fenced and unfenced remnant vegetation in the mid–upper Murrumbidgee and Lachlan catchments in south-eastern Australia. Native species richness, native groundcover and overstorey regeneration were higher at fenced than at unfenced sites. Area of bare ground was lower at fenced sites. Exotic groundcover did not differ between fenced and unfenced sites. Native species richness was higher at sites fenced for longer and with no stock grazing; neither native nor exotic groundcover at fenced sites was related to time since fencing or stock grazing pressure. Some tree species regenerated at both fenced and unfenced sites (Blakely’s red gum, Eucalyptus blakelyi; tumbledown gum, E. dealbata, long-leaved box, E. goniocalyx; red stringbark, E. macrorhyncha), some regenerated at few fenced and few unfenced sites (white box, E. albens; yellow box, E. melliodora) and some regenerated at fenced sites but not at unfenced sites (grey box, E. microcarpa; mugga ironbark, E. sideroxylon; white cypress pine, Callitris glaucophylla). Although less robust than pre- and postfencing monitoring, the comparisons reported here provide a logistically feasible and relatively inexpensive assessment of effects of the sizeable public investment in fencing on vegetation condition.

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Più fonti

Tesi sul tema "Lower Murrumbidgee"

Stubbs, Christopher M. (Christopher Michael). "Hydrologic-economic modeling of irrigated agriculture in the Lower Murrumbidgee Catchment : investigations into sustainability". Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/32183.

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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2000.
Includes bibliographical references (leaves 116-122).
Increasing water scarcity and growing demand for food have made better management of land and water resources essential to maintaining the sustainability of irrigated agriculture. Policies designed to improve environmental quality and irrigated production need to be analyzed in an integrated framework. We present a catchment-scale hydrologic-economic model of irrigated agriculture which is dynamic and spatially distributed. It can be used to evaluate land and water policies designed to manage irrigation-induced salinization. The model incorporates hydrologically realistic representations of groundwater flow and soil salinization into an economic optimization framework. The sum of discounted net revenues from irrigation over the planning horizon is maximized by choosing annual areas planted to each crop in each of the economic subregions. The groundwater system is represented using a linear state-space model derived from a finite-difference approximation of the groundwater flow equation. The number of groundwater states is substantially reduced using balanced truncation, a technique used in control engineering. A simple representation of the salinization process is derived from detailed numerical simulations of unsaturated zone flow and salt transport. These detailed simulations include realistic meterological forcing, crop root extraction, and the effect of shallow, saline watertables. The use of the model for policy analysis is demonstrated in a case study of the Lower Murrumbidgee Catchment. The study area is in the Murray-Darling Basin of Australia and includes a major irrigation district threatened by salinization from rising watertables. We first simulate socially optimal management over a 15-year planning horizon. The socially optimal solution internalizes the externalities of the common-pool groundwater system and allows redistribution of water allocations to different areas. This solution is compared to scenarios which include the common-pool externality and policy options in various combinations. The policy options considered are a restriction on the amount of cropland planted to rice and the trading of surface water allocations. We find the rice area restriction decreases economic net benefits while water trading increases net benefits. There is little difference between the social optimum and the common-pool scenarios suggesting that the cost of the common-pool externality is small.
by Christopher M. Stubbs.
Ph.D.

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Timms, Wendy Amanda Civil &amp Environmental Engineering Faculty of Engineering UNSW. "The importance of aquitard windows in the development of alluvial groundwater systems : Lower Murrumbidgee, Australia". Awarded by:University of New South Wales. School of Civil and Environmental Engineering, 2001. http://handle.unsw.edu.au/1959.4/18671.

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Variable groundwater quality in complex aquifer-aquitard systems presents a challenge for sustainable groundwater development. In the Lower Murrumbidgee alluvial fan of the Murray-Darling Basin in semi arid inland Australia, shallow groundwater is saline (12000 µ S/cm) and locally contaminated by nitrate. Deep fresh aquifers (150 µ S/cm), developed as an irrigation water supply, were thought to be protected from downwards leakage by laterally extensive aquitards. However, hydrochemical sampling, augmented by historic data, revealed that aquifer salinisation (400 to 4000 µ S/cm) had occurred at some sites to 50 m depth since the mid 1980s. Aquitard windows, landscape depositional features at a scale of 10s to 100s of metres which are rarely detected by conventional investigations, were proposed as conduits for rapid downwards leakage in stressed systems. Intensive research was conducted at the Tubbo site where downhole geophysical logging and minimally disturbed cores were used to describe a saline clayey silt to 15m depth, an indurated clayey sand and 2 deep deposits of hard clayey silt. Fracturing was inferred by the scale dependency of aquitard permeability (Kv 10E-11 to 10E-6 m/s). Lithological variation near the surface was delineated by electrical imaging which revealed a 40m wide aquitard window beneath a veneer of smectite clay. Intensive monitoring of groundwater pressures in six piezometers (23-96 m depth) near the Tubbo irrigation bore and two other peizometers upgradient, indicated that the indurated clayey sand formed an effective hydraulic barrier but the deep silty deposits were spatially discontinuous. Groundwater samples were collected before, three times during, and after the 1998-99 irrigation season. A large, but delayed TDS increase occurred in the shallow aquifer and small pulses of saline water were sustained in the middle aquifer but shortlived in the deep aquifer. Hydrochemical and isotopic data dC-13, dH-2, dO-18, C-14 and H-3) showed the middle aquifer mixing with the deep aquifer, though retaining the signature of a palaeowater. Hydrochemical changes were accounted for with PHREEQC inverse mass balance models for the shallow aquifer. Mixing of aquifer water with 20-70% saline porewater from the upper aquitard occurred, together with ion exchange and NaCl dissolution. Based on an axisymmetric radial FEFLOW model, 5-30% of the volume pumped was accounted for by vertical leakage from the middle aquifer. Leakage from the shallow aquifer was small but significant, as it allowed high salinity water to migrate. Permeability and compressible storage measurements (Ss 10E-5 to 10E-4 /m) were used to constrain model calibration, and to show that direct mixing occurred mainly via aquitard windows at depth, and between the shallow and middle aquifers via leaky boreholes. Fracture flow and aquifer-aquitard interaction by diffusion were of secondary importance.

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Timms, W. A. "The importance of aquitard windows in development of alluvial groundwater systems : Lower Murrumbidgee, Australia /". 2001. http://www.library.unsw.edu.au/~thesis/adt-NUN/public/adt-NUN20030113.091215/index.html.

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Capitoli di libri sul tema "Lower Murrumbidgee"

Schuster, Ken, Amanda Kennedy e Cameron Holley. "Reducing Groundwater Entitlements in the Lower Murrumbidgee Groundwater Management Area". In Sustainable Groundwater Management, 365–84. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-32766-8_20.

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