Journal articles on the topic 'Water Victoria Healesville Analysis'
To see the other types of publications on this topic, follow the link: Water Victoria Healesville Analysis.
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 journal articles for your research on the topic 'Water Victoria Healesville Analysis.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.
1
Scheelings, TF, and EC Dobson. "Retrospective analysis of causes of death in mountain pygmy-possums (Burramys parvus) at Healesville Sanctuary, Victoria, Australia." Australian Veterinary Journal 93, no. 11 (October 26, 2015): 424–29. http://dx.doi.org/10.1111/avj.12378.
Full text
2
Vanderkelen, Inne, Nicole P. M. van Lipzig, and Wim Thiery. "Modelling the water balance of Lake Victoria (East Africa) – Part 1: Observational analysis." Hydrology and Earth System Sciences 22, no. 10 (October 25, 2018): 5509–25. http://dx.doi.org/10.5194/hess-22-5509-2018.
Full textAbstract:
Abstract. Lake Victoria is the largest lake in Africa and one of the two major sources of the Nile river. The water level of Lake Victoria is determined by its water balance, consisting of precipitation on the lake, evaporation from the lake, inflow from tributary rivers and lake outflow, controlled by two hydropower dams. Due to a scarcity of in situ observations, previous estimates of individual water balance terms are characterized by substantial uncertainties, which means that the water balance is often not closed independently. In this first part of a two-paper series, we present a water balance model for Lake Victoria, using state-of-the-art remote sensing observations, high-resolution reanalysis downscaling and outflow values recorded at the dam. The uncalibrated computation of the individual water balance terms yields lake level fluctuations that closely match the levels retrieved from satellite altimetry. Precipitation is the main cause of seasonal and interannual lake level fluctuations, and on average causes the lake level to rise from May to July and to fall from August to December. Finally, our results indicate that the 2004–2005 drop in lake level can be about half attributed to a drought in the Lake Victoria Basin and about half to an enhanced outflow, highlighting the sensitivity of the lake level to human operations at the outflow dam.
3
Tou, Stephen K. W., and K. Arumugam. "Spectral analysis of storm surge in Hong Kong Victoria Harbour." Advances in Water Resources 9, no. 3 (September 1986): 178–83. http://dx.doi.org/10.1016/0309-1708(86)90033-3.
Full text
4
Schleiger, N. W. "Cluster analysis of isograptid individuals from Bullengarook, Victoria, Australia." Geological Society, London, Special Publications 20, no. 1 (1986): 79–96. http://dx.doi.org/10.1144/gsl.sp.1986.020.01.08.
Full text
5
Swamikannu, X., D. Radulescu, R. Young, and R. Allison. "A comparative analysis: storm water pollution policy in California, USA and Victoria, Australia." Water Science and Technology 47, no. 7-8 (April 1, 2003): 311–17. http://dx.doi.org/10.2166/wst.2003.0704.
Full textAbstract:
Urban drainage systems historically were developed on principles of hydraulic capacity for the transport of storm water to reduce the risk of flooding. However, with urbanization the percent of impervious surfaces increases dramatically resulting in increased flood volumes, peak discharge rates, velocities and duration, and a significant increase in pollutant loads. Storm water and urban runoff are the leading causes of the impairment of receiving waters and their beneficial uses in Australia and the United States today. Strict environmental and technology controls on wastewater treatment facilities and industry for more than three decades have ensured that these sources are less significant today as the cause of impairment of receiving waters. This paper compares the approach undertaken by the Environmental Protection Authority Victoria for the Melbourne metropolitan area with the approach implemented by the California Environmental Protection Agency for the Los Angeles area to control storm water pollution. Both these communities are largely similar in population size and the extent of urbanization. The authors present an analysis of the different approaches contrasting Australia with the USA, comment on their comparative success, and discuss the relevance of the two experiences for developed and developing nations in the context of environmental policy making to control storm water and urban runoff pollution.
6
Hagai, M. "An Investigation of Kagera River Basin Land Cover Dynamics for Sustainability of Lake Victoria Water Regime." Journal of Sustainable Development 12, no. 4 (July 30, 2019): 166. http://dx.doi.org/10.5539/jsd.v12n4p166.
Full textAbstract:
This paper is reporting on an investigation done to assess land cover dynamics in KRB(Kagera River Basin) (KRB) over a period of 21 years i.e.1990-2011 using Remote Sensing, Hydrology and GIS techniques as a basis for initiating policy interventions for sustainability of Lake Victoria water regime.The extent of land cover changes in the KRB have not been quantified with the view of assessing the extent of exploitation of the natural resources.The assessment is important firstly for identification of causative factors and secondly as a mechanism for formulating necessary policies and remedial measures to that effect.Specifically, Landsat 5, Landsat 7 and ETM+ (2000) satellite images were used.Eight Land Cover classes were identified namely, Forests, Woodland, Bushland, Cultivated Land, Swamps, Grassland, Bareland and Urban areas.Hydrographical data were used to assess changes in quantity of water flowing from the KRB into Lake Victoria and relating it with land cover changes in KRB at in the period of study. Spatial data processing, analysis and interpretation were carried out in ERDAS Imagine and ArcGIS software environments; while water quantity data and other non spatial data were processed and analyzed in Microsoft Excel application 2007.
The study revealed a significant decline of vegetation cover and water quantity discharged from Kagera River to Lake Victoria over the study period. This contravenes the global efforts of ecological sustainability, which urge avoidance of depletion of natural resources for maintenance for ecological balance. These results are in early warning to the Management of Lake Victoria for its potential failure towards achieving the Millennium Development Goal on responsible consumption and protection of natural resources in proximity with Lake Victoria. The Management of Lake Victoria in collaboration with other relevant authorities should thus, take remedial measures to control further depletion of vegetation cover in KRB for sustainability of Lake Victoria and its ecosystem.
7
Lin, Yi, Xin Li, Tinghui Zhang, Nengfang Chao, Jie Yu, Jianqing Cai, and Nico Sneeuw. "Water Volume Variations Estimation and Analysis Using Multisource Satellite Data: A Case Study of Lake Victoria." Remote Sensing 12, no. 18 (September 18, 2020): 3052. http://dx.doi.org/10.3390/rs12183052.
Full textAbstract:
The spatiotemporal changes of lake water resources objectively reflect not only the process of the water resources balance, but also the ecological environment changes in the lake area. In recent decades, climate changes and human activities have caused great impacts on the spatial distribution of the earth’s water resources and the spatiotemporal process of the surface water cycle, which has caused a series of ecological crises and environmental problems, such as the drying-up of inland lakes, the disappearance of the oasis, water shortage or flooding and water pollution. Therefore, monitoring and fully understanding the dynamic changes of lakes is of great scientific significance for grasping regional water balance, water resources management, and sustainable development of the ecological environment. In this study, we focus on using multi-source satellite data on the estimation of water volume and multi-timescale variations analysis for large scale lakes. This study combines the problems in the practical application of “African Water Action”, taking the largest lake in Africa, Lake Victoria, as the study area, and utilizes long-term serial multi-source satellite data of the past 15 years (2003–2017), including Moderate-resolution Imaging Spectroradiometer (MODIS), Jason-1/-2/-3 and Gravity Recovery and Climate Experiment (GRACE) to perform the comprehensive analysis on the water volume change estimation. Firstly, the satellite altimetry data of Jason-1/-2/-3 and MODIS imagery was used to calculate series of water level, and to extract series of water surface area, respectively. On this basis, a more accurate regression model between the area and water level variation (ΔH) was constructed. Then, the model between water volume variation (ΔV) and ΔH, derived from area-ΔH model, was applied to calculate the relative water volume of Lake Victoria. Meanwhile, terrestrial water storage (TWS) changes between 2003 and 2016, derived from GRACE data, were also used for a comparative verification of the ΔV results. The results show the long-term series change trends of ΔV and the TWS are the same. Finally, the multi-timescale analysis of water volume changes was carried out on different time scales, such as the inter-annual, inter-monthly, and variation period.
8
Younas, Muhammad, Shuhab D. Khan, Muhammad Qasim, and Younes Hamed. "Assessing Impacts of Land Subsidence in Victoria County, Texas, Using Geospatial Analysis." Land 11, no. 12 (December 5, 2022): 2211. http://dx.doi.org/10.3390/land11122211.
Full textAbstract:
Land subsidence is an ongoing problem negatively affecting Victoria County along the Gulf Coast. Groundwater withdrawal and hydrocarbon extraction in the County are some of the known factors behind this geological hazard. In this study, we have used geospatial analysis and a conceptual model to evaluate land subsidence. A significant decline in the groundwater level in this area was noted from 2006 to 2016. The decline in the water level correlates with the major drought events along the Gulf Coast reported in earlier studies. These results are further corroborated by the emerging hotspot analysis performed on the groundwater data. This analysis divides the study area into intensifying, sporadic, and persistent hotspots in the northwest region and intensifying, persistent coldspots in the southeast region of Victoria County. Hydrocarbon production data show high oil and gas extraction from 2017 to 2021. There are a higher number of hydrocarbon production wells in the central and southern regions of the County than elsewhere. The conceptual models relate these events and suggest the existence of subsidence in the County, through which the water and hydrocarbon reservoirs in the study area may lose their reservoir characteristics due to sediment compaction.
9
Dobes, Leo, Mason Crane, Tim Higgins, Albert I. J. M. Van Dijk, and David B. Lindenmayer. "Increased livestock weight gain from improved water quality in farm dams: A cost-benefit analysis." PLOS ONE 16, no. 8 (August 16, 2021): e0256089. http://dx.doi.org/10.1371/journal.pone.0256089.
Full textAbstract:
Access to water is a critical aspect of livestock production, although the relationship between livestock weight gain and water quality remains poorly understood. Previous work has shown that water quality of poorly managed farm dams can be improved by fencing and constructing hardened watering points to limit stock access to the dam, and revegetation to filter contaminant inflow. Here we use cattle weight gain data from three North American studies to develop a cost-benefit analysis for the renovation of farm dams to improve water quality and, in turn, promote cattle weight gain on farms in south-eastern Australia. Our analysis indicated a strong likelihood of positive results and suggested there may be substantial net economic benefit from renovating dams in poor condition to improve water quality. The average per-farm Benefit-Cost Ratios based on deterministic assumptions was 1.5 for New South Wales (NSW) and 3.0 for Victoria in areas where rainfall exceeds 600mm annually. Our analyses suggested that cattle on farms in NSW and Victoria would need to experience additional weight gain from switching to clean water of at least 6.5% and 1.8% per annum respectively, to break even in present value terms. Monte Carlo simulation based on conservative assumptions indicated that the probability of per-farm benefits exceeding costs was greater than 70%. We recommend localised experiments to assess the impact of improved water quality on livestock weight gain in Australian conditions to confirm these expectations empirically.
10
Paterson, John. "Water Management and Recreational Values; Some Cases in Victoria, Australia." Water Science and Technology 21, no. 2 (February 1, 1989): 1–12. http://dx.doi.org/10.2166/wst.1989.0021.
Full textAbstract:
The growing recognition of recreational and amenity demands on water systems introduces a multitude of issues, many of them complex, to the established tasks of water quality management and water management generally. Victorian case studies are presented. They (1) illustrate the range and diversity of situations that can arise in managing competition and enhancing compatibility between traditional water supply objectives and recreational demands. (2) Fluctuation of storage levels, essential to storage operations, detract from recreational value. Recreational and tourism demands upon Lake Hume have grown to threaten traditional operating flexibility. (3) Mokoan is another such instance, but with its supply function in a state of flux, Lake Mokoan provides more scope for a shift in the balance. (4) Salinity management has become an issue in the management of lakes and wetlands when water supply interests and environmental/recreation interests respectively have different perspectives on salt disposal. (5) Recreational use of town supply sources has long been a vexed issue, although marked shifts in the attitudues of many supply authorities have occurred in recent years. (6) Eutrophication of lakes and estuaries raises difficult issues of responsibility and scientific uncertainty, and the water management connection may be tenuous but will attract public attention. (7) The water body attributes valued by specialised recreational interests require definition in terms that water managers can deal with using routine techniques of systems analysis and evaluation. (8) The demands of the fish population and anglers introduce a new perspective in river management and perceptions of instream values are changing markedly. (9) Direct costs of recreational services supplied by water authorities are not fully accounted: allocation choices and fiscal incidence will emerge as issues of significance. (10) These case studies raise only a fraction of the total range of matters that will, in the years to come, tax the technology and political skills of governments and management.
11
Nyawacha, S. O., V. Meta, and A. Osio. "SPATIAL TEMPORAL MAPPING OF SPREAD OF WATER HYACINTH IN WINUM GULF, LAKE VICTORIA." International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLIII-B3-2021 (June 28, 2021): 341–46. http://dx.doi.org/10.5194/isprs-archives-xliii-b3-2021-341-2021.
Full textAbstract:
Abstract. Water hyacinth (Eichhornia crassipes) is an invasive hydro plant that invaded the waters of Lake Victoria and has since been spreading rapidly affecting the socio-economic livelihood of the community around the Lake. The weed's rapid spread is due to various anthropogenic activities in the surrounding environment among them being the eutrophication of the lake waters.This study aims at using remote sensing applications and presenting the results of the analysis of the water hyacinth Normalized Difference Vegetation Index (NDVI), water extent, and analysis of correlation with the water quality over time from Sentinel 2 satellite imagery in January 2017 to January of 2021. The analysis aims at understanding the vegetation growth coverage in the five years and sets the basis of monthly predictive modelling of the behavior of water hyacinth. Predictive modelling applies historical statistical data while trying to use trend analysis in predicting the future behavior of a phenomenon. This study also seeks to answer the research question of the role of suspended sediments and dissolved minerals in abating the spread of and growth of water hyacinth.
12
Mekanik, F., and M. A. Imteaz. "Variability of cool seasonal rainfall associated with Indo-Pacific climate modes: case study of Victoria, Australia." Journal of Water and Climate Change 9, no. 3 (February 22, 2018): 584–97. http://dx.doi.org/10.2166/wcc.2018.146.
Full textAbstract:
Abstract This study focused on diagnosing the relative and independent role of El Niño Southern Oscillation (ENSO) and Indian Ocean Dipole (IOD) on austral cool seasonal rainfall by stratifying the cool seasonal rainfall into winter (June–August) and spring (September–November). Partial regression and classification analysis was used to investigate the effect of the climate modes on rainfall in the state of Victoria in southeast Australia. Partial regression analyses revealed that when the influence of IOD is removed from ENSO, sea surface temperature (SST) anomalies in the Pacific Ocean have no significant effect on spring rainfall across Victoria and affect winter rainfall mildly in west Victoria. By removing the inter-correlations between ENSO and IOD, SST anomalies in the Indian Ocean and SLP anomalies in the Pacific Ocean showed weak relationships with Victoria's spring and winter rainfall. Classification analysis demonstrated the effects of phases of ENSO and IOD on Victoria's seasonal rainfall; the dry phases of the climate modes have more effect on spring rainfall compared to the wet phases and both show no significant effect on winter rainfalls. It is recommended that for water availability forecasting in Victoria, water managers should focus on the effect of climate modes on spring rainfalls, particularly during the dry phases of ENSO and IOD.
13
Rahmat, Siti Nazahiyah, Niranjali Jayasuriya, and Muhammed A. Bhuiyan. "Precipitation trends in Victoria, Australia." Journal of Water and Climate Change 6, no. 2 (October 13, 2014): 278–87. http://dx.doi.org/10.2166/wcc.2014.007.
Full textAbstract:
Annual rainfall series trends were investigated for more than 100 years of data using two non-parametric trend tests Mann–Kendall (MK) and Sen's slope (Q) for five selected meteorological stations in Victoria, Australia. The annual rainfall time series showed no significant trends for any of the five stations. To assess the sensitivity of trends to the length of the time periods considered, the annual rainfall analysis was repeated using recent data from approximately half the data set between 1949 and 2011. Contrasting results from the original full data set analysis were revealed. All five stations showed decreasing trends with two stations showing significant trends suggesting that this recent time period has added more low precipitation data to the time series. The year of abrupt changes for all the five stations identified using the sequential MK test varied. Conclusions drawn from this paper, point to the importance of selecting the time series data length in identifying trends and abrupt changes. Due to the climate variability, trend testing results might be biased and strongly dependent on the data period selected. Therefore, use of the full data set available would be required in order to improve understanding of change or to undertake any further studies.
14
Smith, Kara A., and Fredrick H. M. Semazzi. "The Role of the Dominant Modes of Precipitation Variability over Eastern Africa in Modulating the Hydrology of Lake Victoria." Advances in Meteorology 2014 (2014): 1–11. http://dx.doi.org/10.1155/2014/516762.
Full textAbstract:
Previous water budget studies over Lake Victoria basin have shown that there is near balance between rainfall and evaporation and that the variability of Lake Victoria levels is determined virtually entirely by changes in rainfall since evaporation is nearly constant. The variability of rainfall over East Africa is dominated by El Niño-Southern Oscillation (ENSO); however, the second and third most dominant rainfall climate modes also account for significant variability across the region. The relationship between ENSO and other significant modes of precipitation variability with Lake Victoria levels is nonlinear. This relationship should be studied to determine which modes need to be accurately modeled in order to accurately model Lake Victoria levels, which are important to the hydroelectric industry in East Africa. The objective of this analysis is to estimate the relative contributions of the dominant modes of annual precipitation variability to the modulation of Lake Victoria levels for the present day (1950–2012). The first mode of annual rainfall variability accounts for most of the variability in Lake Victoria levels, while the effects of the second and third modes are negligible even though these modes are also significant over the region.
15
Cesari, Michele, Sandra J. McInnes, Roberto Bertolani, Lorena Rebecchi, and Roberto Guidetti. "Genetic diversity and biogeography of the south polar water bear Acutuncus antarcticus (Eutardigrada : Hypsibiidae) – evidence that it is a truly pan-Antarctic species." Invertebrate Systematics 30, no. 6 (2016): 635. http://dx.doi.org/10.1071/is15045.
Full textAbstract:
Antarctica is an ice-dominated continent and all its terrestrial and freshwater habitats are fragmented, which leads to genetic divergence and, eventually, speciation. Acutuncus antarcticus is the most common Antarctic tardigrade and its cryptobiotic capabilities, small size and parthenogenetic reproduction present a high potential for dispersal and colonisation. Morphological (light and electron microscopy, karyology) and molecular (18S rRNA and cytochrome c oxidase subunit I (COI) genes) analyses on seven populations of A. antarcticus elucidated the genetic diversity and distribution of this species. All analysed populations were morphologically indistinguishable and made up of diploid females. All specimens presented the same 18S rRNA sequence. In contrast, COI analysis showed higher variability, with most Victoria Land populations presenting up to five different haplotypes. Genetic distances between Victoria Land specimens and those found elsewhere in Antarctica were low, while distances between Dronning Maud Land and specimens from elsewhere were high. Our analyses show that A. antarcticus can still be considered a pan-Antarctic species, although the moderately high genetic diversity within Victoria Land indicates the potential for speciation events. Regions of Victoria Land are considered to have been possible refugia during the last glacial maximum and a current biodiversity hotspot, which the populations of A. antarcticus mirror with a higher diversity than in other regions of Antarctica.
16
Khastagir, Anirban, Niranjali Jayasuriya, and Muhammed A. Bhuiyan. "The use of joint probability analysis to predict water yield for Thomson catchment in Victoria, Australia." Natural Hazards 104, no. 3 (September 8, 2020): 2619–34. http://dx.doi.org/10.1007/s11069-020-04288-y.
Full text
17
Awange, Joseph L., Mohammad A. Sharifi, Godfrey Ogonda, Jens Wickert, Erik W. Grafarend, and Monica A. Omulo. "The Falling Lake Victoria Water Level: GRACE, TRIMM and CHAMP Satellite Analysis of the Lake Basin." Water Resources Management 22, no. 7 (July 7, 2007): 775–96. http://dx.doi.org/10.1007/s11269-007-9191-y.
Full text
18
Romanescu, Gheorghe, Madalina Pascal, Alin Mihu Pintilie, Cristian Constantin Stoleriu, Ion Sandu, and Madalina Moisii. "Water Quality Analysis in Wetlands Freshwater: Common Floodplain of Jijia-Prut Rivers." Revista de Chimie 68, no. 3 (April 15, 2017): 553–61. http://dx.doi.org/10.37358/rc.17.3.5500.
Full textAbstract:
Water resources in the Jijia catchment basin are limited and often polluted. The catchment basin of Jijia is situated in northeastern Romania and it crosses the Moldavian Plain on the north-west-south-east direction. The purpose of the present study is to analyze 26 physico-chemical parameters providing the annual and multiannual water quality index. Two water-sampling points were selected: Jijia-Victoria [S.1] and Jijia-Opriseni [S.2]. The high values of nitrates are caused by the use of nitrogen-based chemical fertilizers and of manure. Contamination with nitrites (N-NO2-) and nitrates (N-NO3-) of wetlands and deepwater habitats in the floodplain of Jijia is still high because of agricultural and zootechnical activities. The phosphorus within freshwater habitats is a consequence of anthropogenic pressure: improper storage of animal waste and/or use of phosphates-based fertilizers. Global water quality index (WQi) shows that both monitoring stations are included in the Medium high class.
19
Kimaro, T. A., and R. Fidelis. "Impacts of Lake Victoria Level Fluctuations to Livelihoods Missungwi District Case Study." Tanzania Journal of Engineering and Technology 30, no. 2 (December 31, 2007): 98–109. http://dx.doi.org/10.52339/tjet.v30i2.403.
Full textAbstract:
Lake Victoria experienced drastic levels changes in 2005 causing great inconveniences to lakeside communities. Thisstudy investigated effects of these changes on livelihoods through questionnaire surveys, focused group discussions,interviews and analysis of fish catches, diseases, crops, and lake levels data. Results indicate recession of levels hadvarious socio-economic impacts. The changes caused severe water shortage due to drying up of shallow wells and aremarkable increase in prevalence of schistosomiasis because of increased utilization of lake water. There was noevidence for impact of level changes on malaria and diarrhea. Decline of water levels caused decline in fish catches dueto retreat of water from breeding sites. However receding waters created a new land for cultivation which helped toboost Maize and sweet potatoes production. The results emphasize on ensuring stability of lake levels to avoid negativeimpacts on livelihoods and to maintain ecological integrity of the lake.
20
Chessman, BC. "Artificial-substratum periphyton and water quality in the lower La Trobe River, Victoria." Marine and Freshwater Research 36, no. 6 (1985): 855. http://dx.doi.org/10.1071/mf9850855.
Full textAbstract:
Between February 1975 and March 1977, periphyton from artificial substrata (glass microscope slides) and water samples for physicochemical analysis were obtained from eight sites on the lowland section of the La Trobe River, which flows through agricultural, urban and industrial areas. Total organic matter on the slides, estimated as weight loss on ignition, was usually highest in summer or autumn when river flows were low. However, chlorophyll a densities generally peaked in late winter and spring when nitrate concentrations were high, except at a site upstream of major urban and industrial areas, where a summer-autumn increase occurred. Thermal discharges from major power stations had no obvious effect on chlorophyll abundance, but did appear to substantially influence diatom assemblage composition from late summer to early winter, when river temperatures were highest. Downstream of the Morwell River confluence, diatom assemblages were influenced by a sharp increase in dissolved solids concentration and probably also by the grazing activities of snails (Ferrissia petterdi and Physastra gibbosa). The diatom flora at the most downstream site showed some evidence of recovery from thermal effects.
21
Novis, Phil M., and Rob D. Smissen. "Two genetic and ecological groups of Nostoc commune in Victoria Land, Antarctica, revealed by AFLP analysis." Antarctic Science 18, no. 4 (November 14, 2006): 573–81. http://dx.doi.org/10.1017/s0954102006000617.
Full textAbstract:
Microscopy, DNA sequencing, and amplified fragment length polymorphism (AFLP) were used to examine variation within Nostoc commune from collections between 72 and 78°S in Victoria Land, Antarctica. Although there is considerable bias of collected material towards southern latitudes, and this material varies greatly in age (collected between 1984 and 2004), an important new phylogeographic pattern was found. DNA sequencing of the tRNAleu(UAA) region, used recently to define form species N. commune, revealed little variation between collections. AFLP analysis, however, split the collected material according to habitat (irrigated soil communities versus ponds), rather than latitude. These results suggest that environmental factors linked to latitude are not the greatest drivers of genetic variation in Victoria Land. These may operate at a lower level but would require intensive sampling within narrowly defined habitat types at a range of latitudes to uncover. We advocate extensive sampling across local environmental gradients based on water availability, comparative culturing, and development of sequence characterised amplified regions (SCARs) across a range of latitudes in future seasons of the Latitudinal Gradient Project.
22
Mkuna, Eliaza, and Lloyd J. S. Baiyegunhi. "Analysis of the technical efficiency of Nile perch (Lates niloticus ) fishers in the Tanzanian portion of Lake Victoria: A stochastic frontier analysis." Lakes & Reservoirs: Research & Management 24, no. 3 (July 25, 2019): 228–38. http://dx.doi.org/10.1111/lre.12274.
Full text
23
Burgio, Lucia, and Thomas Gregory. "Protocol for the Analysis of Cross-Sections from Gilded Surfaces." Heritage 4, no. 3 (September 15, 2021): 2416–30. http://dx.doi.org/10.3390/heritage4030136.
Full textAbstract:
This paper describes the protocol currently used at the Victoria and Albert Museum for the scientific analysis of water, oil and lacquer gilding in cultural heritage objects. The purpose of the protocol is to guide scientists, curators and conservators in their routine investigations, and address questions about the characteristics of gilded surfaces, their number, sequence, date, composition and stratigraphic details. Each protocol step is described in detail and is accompanied by practical examples taken from the analysis of an 18th-century Chippendale table and the 20th-century statue of the Spirit of Gaiety. The merits of individual analytical techniques and equipment are also evaluated.
24
Welsh, DR, and DB Stewart. "Applications of intervention analysis to model the impact of drought and bushfires of Water Quality." Marine and Freshwater Research 40, no. 3 (1989): 241. http://dx.doi.org/10.1071/mf9890241.
Full textAbstract:
Intervention analysis is a rigorous statistical modelling technique used to measure the effect of a shift in the mean level of a time series, caused by an intervention. A general formulation of an intervention model is applied to water-quality data for two streams in north-eastern Victoria, measuring the effect of drought on the electrical conductivity of one stream, and the effect of bushfires on the flow and turbidity of the other. The nature of the intervention is revealed using exploratory data-analysis techniques, such as smoothing and boxplots, on the time-series data. Intervention analysis is then used to confirm the identified changes and estimate their magnitude. The increased level of electrical conductivity due to drought is determined by three techniques of estimation and the results compared. The best of these techniques is then used to model changes in stream flow and turbidity following bushfires in the catchment.
25
Kizza, Michael, Jose-Luis Guerrero, Allan Rodhe, Chong-yu Xu, and Henry K. Ntale. "Modelling catchment inflows into Lake Victoria: regionalisation of the parameters of a conceptual water balance model." Hydrology Research 44, no. 5 (November 9, 2012): 789–808. http://dx.doi.org/10.2166/nh.2012.152.
Full textAbstract:
The goal of this study was to evaluate regionalisation methods that could be used for modelling catchment inflows into Lake Victoria. WASMOD, a conceptual water balance model, was applied to nine gauged sub-basins in Lake Victoria basin in order to test the transferability of model parameters between the basins using three regionalisation approaches. Model calibration was carried out within the GLUE (generalised likelihood uncertainty estimation) framework for uncertainty assessment. The analysis was carried out for the period 1967–2000. Parameter transferability was assessed by comparing the likelihood values of regionalised simulations with the values under calibration for each basin. WASMOD performed well for all study sub-basins with Nash–Sutcliffe values ranging between 0.70 and 0.82. Transferability results were mixed. For the proxy-basin method, the best performing parameter donor basin was Mara with four proxy basins giving acceptable results. Sio, Sondu, Gucha and Duma also performed well. The global mean method gave acceptable performance for seven of the nine study basins. The ensemble regionalisation method provides the possibility to consider parameter uncertainty in the regionalisation. Ensemble regionalisation method performed best with an average departure of 40% from the observed mean annual flows compared to 48 and 60% for proxy-basin and global mean methods, respectively.
26
Tovar-Ávila, Javier, Terence I. Walker, and Robert W. Day. "Reproduction of Heterodontus portusjacksoni in Victoria, Australia: evidence of two populations and reproductive parameters for the eastern population." Marine and Freshwater Research 58, no. 10 (2007): 956. http://dx.doi.org/10.1071/mf06230.
Full textAbstract:
Significant differences in the length–frequency composition of catch samples, mass–length relationships and length-at-maturity found between Heterodontus portusjacksoni from western and far-eastern Victoria, suggest the presence of at least two separate breeding populations off south-eastern Australia, with some mixing between these regions. In each region females attain a larger size than males, and collectively those sharks in western Victoria are smaller, present higher mass-at-length, and lower length-at-maturity than those in far-eastern Victoria. These regional differences might be a result of sampling bias, length-selective fishing mortality, environmental conditions, or genetic differences. However, tagging evidence from previous studies and the presence of two bio-geographic provinces in the region support the hypothesis of two separate breeding populations. The essential reproductive parameters for H. portusjacksoni population analysis in far-eastern Victoria were determined, using a novel method to estimate fecundity and the ovarian cycle of an egg-laying species. In this region, females have between 6 and 20 pre-ovulatory oocytes (average = 14, n = 29, standard deviation = 3.71) before the reproductive season. The species has an annual reproductive cycle correlated with water temperature, with ovulation starting during late winter to early spring and a ~6 month egg-laying period. The period from the onset of vitellogenesis to ovulation of oocytes is ~18 months.
27
Zhou, Jian, Yuanyuan Wang, Fu Xiao, Yunyun Wang, and Lijuan Sun. "Water Quality Prediction Method Based on IGRA and LSTM." Water 10, no. 9 (August 27, 2018): 1148. http://dx.doi.org/10.3390/w10091148.
Full textAbstract:
Water quality prediction has great significance for water environment protection. A water quality prediction method based on the Improved Grey Relational Analysis (IGRA) algorithm and a Long-Short Term Memory (LSTM) neural network is proposed in this paper. Firstly, considering the multivariate correlation of water quality information, IGRA, in terms of similarity and proximity, is proposed to make feature selection for water quality information. Secondly, considering the time sequence of water quality information, the water quality prediction model based on LSTM, whose inputs are the features obtained by IGRA, is established. Finally, the proposed method is applied in two actual water quality datasets: Tai Lake and Victoria Bay. Experimental results demonstrate that the proposed method can take full advantage of the multivariate correlations and time sequence of water quality information to achieve better performance on water quality prediction compared with the single feature or non-sequential prediction methods.
28
Zhang, Shihao, Junhe Tan, Junhang Liu, Jiaqi Wang, and Ata Tara. "Suitability Prediction and Enhancement of Future Water Supply Systems in Barwon Region in Victoria, Australia." Land 11, no. 5 (April 23, 2022): 621. http://dx.doi.org/10.3390/land11050621.
Full textAbstract:
Intensive agricultural production accompanied by the climate change impacts in post-Colonial rural landscapes have continuously increased the demand for water resources and coastal areas, showing an unprecedented water supply crisis. By taking extreme weather conditions and rainfall events for future trends, a resilient water storage facility for the landscape requires the collaborative approach of natural systems and simulation modelling techniques to develop sustainable future scenarios. In this study, an ecological suitability model is used to identify potential sites for the construction of multi-purpose dams. As part of the model structure, multi factors are classified using the patterns of changing landscapes, and then weighted overlay analysis is conducted on a Geographic Information System (GIS) platform. Compared to previous studies, this paper derives its principal impact parameters and projections based on historical land cover information. The suitability maps that are generated visually guide the geographical location of the multi-purpose dams and indicate the areas from highly suitable to least suitable, clarifying the possibility of building blue infrastructure alongside the waterways in west-central Barwon. The workflow proposes a resilient water system based on existing land characteristics and measures that future water storage capacity will be a valid increase of approximately 1.5 times. This strategy alleviates water scarcity during the dry season to benefit traditional agricultural activities. Digital calculations are utilized to demonstrate the feasibility of the experimental results, providing a methodology for regulating the distribution and supply of river flows throughout the year while retaining runoff in a hierarchical pattern at precipitation periods.
29
Bhakti, Sri Sadhana, and Samser Nababan. "ANALISA DAYA HISAP SUCTION PUMP MERK CHEIRON TYPE VICTORIA." JURNAL MUTIARA ELEKTROMEDIK 4, no. 1 (June 26, 2020): 48–54. http://dx.doi.org/10.51544/elektromedik.v4i1.3244.
Full textAbstract:
A Suction Pump Is A Tool That Has A Function To Suck Unneeded Liquids In The Human Body. So, Analyze The Suction Power Of The Cheiron Type Victoria Suction Pump On Parameters -20 Kpa, -40 Kpa, -60 Kpa, And -75 Kpa In Time 5 Second As A Result Of Research In The Workshop Installation Of The Hospital Dr. Pringadi Medan City.This study uses a quantitative experimental research type. By Carrying Out Measurements, Testing And Taking Data Directly On The Cheiron Type Victoria Suction Pump, Based On The Effect Of Suction Power -20 Kpa, -40 Kpa, -60 Kpa, And -75 Kpa. The purpose of this research is to determine the speed of suction power (vacuum) of the Chairon type Victoria suction pump in water and to determine and analyze the effect of suction on the time that has been determined. To Get Suction Results In Accordance With The Needs And Also The Accuracy Of A Medical Device, It Is Needed To Test The Accuracy Of The Output (Output) Of Suction Power,So that the Output (Output) From The Suction Power To The Patient With An Accurate And Safe Condition. After Research And Analysis Is Conducted, It Is Known That There Are Output Deviation (Output) Suction Power That Is Still Within The Specified Tolerance Limit <- 10.
30
Reutter, Beatriz, Paul A. Lant, and Joe L. Lane. "Direct and indirect water use within the Australian economy." Water Policy 20, no. 6 (September 24, 2018): 1227–39. http://dx.doi.org/10.2166/wp.2018.055.
Full textAbstract:
Abstract We present the first analysis of water use in the Australian economy to account for inter-state trade, exports and consumption patterns, across all economic sectors and incorporating a temporal analysis. This is achieved by using the environmentally extended input-output technique, combining state-level input-output and water accounts from the Australian Bureau of Statistics. Results show that the three big eastern economies (New South Wales, Victoria, Queensland) rely mostly on water used within their jurisdictions. Approximately one-third of water consumption is for exported commodities, with the biggest export flows of virtual water being associated with agricultural production. Comparing results across the years (2000–2011), the water consumption associated with the provision of goods and services has decreased by 32% for exports, and by 38% for domestic markets. To date in Australia, the focus for improved trans-boundary water management (within Australia) has been on improved mechanisms for sharing physical allocation of water; these results provide the trans-boundary economic dependencies related to water availability. Recent innovations in the compilation of economic input-output models create an opportunity to progress this analysis, exploring in detail the economy–water interlinkages. It is our intention that the paper shows the value of analysing water flows using the multi-regional input-output techniques.
31
Shamsudduha, Mohammad, Richard G. Taylor, Darren Jones, Laurent Longuevergne, Michael Owor, and Callist Tindimugaya. "Recent changes in terrestrial water storage in the Upper Nile Basin: an evaluation of commonly used gridded GRACE products." Hydrology and Earth System Sciences 21, no. 9 (September 12, 2017): 4533–49. http://dx.doi.org/10.5194/hess-21-4533-2017.
Full textAbstract:
Abstract. GRACE (Gravity Recovery and Climate Experiment) satellite data monitor large-scale changes in total terrestrial water storage (ΔTWS), providing an invaluable tool where in situ observations are limited. Substantial uncertainty remains, however, in the amplitude of GRACE gravity signals and the disaggregation of TWS into individual terrestrial water stores (e.g. groundwater storage). Here, we test the phase and amplitude of three GRACE ΔTWS signals from five commonly used gridded products (i.e. NASA's GRCTellus: CSR, JPL, GFZ; JPL-Mascons; GRGS GRACE) using in situ data and modelled soil moisture from the Global Land Data Assimilation System (GLDAS) in two sub-basins (LVB: Lake Victoria Basin; LKB: Lake Kyoga Basin) of the Upper Nile Basin. The analysis extends from January 2003 to December 2012, but focuses on a large and accurately observed reduction in ΔTWS of 83 km3 from 2003 to 2006 in the Lake Victoria Basin. We reveal substantial variability in current GRACE products to quantify the reduction of ΔTWS in Lake Victoria that ranges from 80 km3 (JPL-Mascons) to 69 and 31 km3 for GRGS and GRCTellus respectively. Representation of the phase in TWS in the Upper Nile Basin by GRACE products varies but is generally robust with GRGS, JPL-Mascons, and GRCTellus (ensemble mean of CSR, JPL, and GFZ time-series data), explaining 90, 84, and 75 % of the variance respectively in "in situ" or "bottom-up" ΔTWS in the LVB. Resolution of changes in groundwater storage (ΔGWS) from GRACE ΔTWS is greatly constrained by both uncertainty in changes in soil-moisture storage (ΔSMS) modelled by GLDAS LSMs (CLM, NOAH, VIC) and the low annual amplitudes in ΔGWS (e.g. 1.8–4.9 cm) observed in deeply weathered crystalline rocks underlying the Upper Nile Basin. Our study highlights the substantial uncertainty in the amplitude of ΔTWS that can result from different data-processing strategies in commonly used, gridded GRACE products; this uncertainty is disregarded in analyses of ΔTWS and individual stores applying a single GRACE product.
32
Pawsey, Nicholas, Jayanath Ananda, and Zahirul Hoque. "Rationality, accounting and benchmarking water businesses." International Journal of Public Sector Management 31, no. 3 (April 9, 2018): 290–315. http://dx.doi.org/10.1108/ijpsm-04-2017-0124.
Full textAbstract:
Purpose The purpose of this paper is to explore the sensitivity of economic efficiency rankings of water businesses to the choice of alternative physical and accounting capital input measures. Design/methodology/approach Data envelopment analysis (DEA) was used to compute efficiency rankings for government-owned water businesses from the state of Victoria, Australia, over the period 2005/2006 through 2012/2013. Differences between DEA models when capital inputs were measured using either: statutory accounting values (historic cost and fair value), physical measures, or regulatory accounting values, were scrutinised. Findings Depending on the choice of capital input, significant variation in efficiency scores and the ranking of the top (worst) performing firms was observed. Research limitations/implications Future research may explore the generalisability of findings to a wider sample of water utilities globally. Future work can also consider the most reliable treatment of capital inputs in efficiency analysis. Practical implications Regulators should be cautious when using economic efficiency data in benchmarking exercises. A consistent approach to account for the capital stock is needed in the determination of price caps and designing incentives for poor performers. Originality/value DEA has been widely used to explore the role of ownership structure, firm size and regulation on water utility efficiency. This is the first study of its kind to explore the sensitivity of DEA to alternative physical and accounting capital input measures. This research also improves the conventional performance measurement in water utilities by using a bootstrap procedure to address the deterministic nature of the DEA approach.
33
Opere, Wasonga Michael, Maingi John, and Omwoyo Ombori. "Occurrence of Enteric Viruses in Surface Water and the Relationship with Changes in Season and Physical Water Quality Dynamics." Advances in Virology 2020 (July 3, 2020): 1–11. http://dx.doi.org/10.1155/2020/9062041.
Full textAbstract:
Environmental water quality issues have dominated global discourse and studies over the past five decades. Significant parameters of environmental water quality include changes in biological and physical parameters. Some of the biological parameters of significance include occurrence of enteric viruses. Enteric viruses can affect both human and animal’s health by causing diseases such as gastrointestinal and respiratory infections. In this study, the relationship between the occurrence of enteric viruses with reference to adenoviruses and enteroviruses and the physical water quality characteristics was assessed from water samples collected from Lake Victoria (LV) in Kenya. In order to understand the dynamics of season driven enteric viruses’ contamination of the lake waters, we additionally analysed seasonal behavior of the lake’s catchment area in terms of rainfall effects. Physical quality parameters were measured on-site while viral analysis was carried out by molecular methods using the nested polymerase chain reaction (nPCR). From 216 samples that were analysed for viral contamination, enteric viral genomes were discovered in 18 (8.3%) of the samples. Out of half of the samples (108) collected during the rainy season, enteric viral genomes were detected in 9.26% (10) while 8 (7.41%) samples tested positive from the other half of the samples (108) collected during the dry season. There was, however, no significant correlation noted between the physical water quality characteristics and the enteric viruses’ occurrence. Neither wet season nor dry season was significantly associated with the prevalence of the viruses. In Lake Victoria waters, most of the samples had an average of physical water quality parameters that were within the range accepted by the World Health Organization (WHO) for surface waters with exemption of turbidity which was above the recommended 5 NTU as recorded from some sampling sites. Continuous and long-term surveillance of the lake water to accurately monitor the contaminants and possible correlation between chemical, physical, and biological characteristics is recommended. This would be important in continuous understanding of the hydrological characteristics changes of the lake for proper management of its quality with reference to the WHO standards. A multiple varied-sampling approach in different geographical regions during different seasons is recommended to establish the geographical distribution and relatedness to seasonal distribution patterns of the viruses. The data generated from this study will be useful in providing a basis for assessment of seasonally driven fecal pollution load of the lake and enteric virus contamination for proper management of the sanitary situation around the lake.
34
Rogers, J. G., G. G. Adams, F. A. C. Wright, K. Roberts-Thomson, and M. V. Morgan. "Reducing Potentially Preventable Dental Hospitalizations of Young Children: A Community-Level Analysis." JDR Clinical & Translational Research 3, no. 3 (March 15, 2018): 272–78. http://dx.doi.org/10.1177/2380084418764312.
Full textAbstract:
An increasing number of Australians are being admitted to hospitals and day procedure centers to have dental treatment under a dental general anesthetic (DGA). Children younger than 2 y are having DGAs. These operations are costly and, although there have been improvements in safety, are not without risk. Most DGAs in children are to treat dental caries and have been defined as potentially preventable dental hospitalizations (PPDHs). This article reports on an analysis of the impact of access to community water fluoridation (CWF), availability of oral health professionals (OHPs), and socioeconomic status (SES) on PPDHs of 0- to 4-y-olds in 2012–2013 in Victoria, Australia. Data on these variables were obtained at the community (postcode) level. From the negative binomial multivariate analysis, each of the 3 independent variables was independently significantly associated with PPDHs at the postcode level. Children residing in postcodes without CWF on average had 59% higher rates than those with access (incident rate ratio [IRR], 1.59; P < 0.0001), children in postcodes with the lowest level of availability of OHPs had 65% higher rates than those with the highest access (IRR, 1.65; P < 0.0001), and children living in the most disadvantaged SES quintiles had 57% higher rates than children in the most advantaged quintiles (IRR, 1.57; P < 0.0001). There was a stepwise social gradient by SES quintile. In analysis of access to CWF and SES status, children without access to CWF had 86% higher PPDH rates than children with access (IRR, 1.86; P < 0.0001). In summary, no access to CWF, poor availability of OHPs, and lower SES status were independently associated with higher PPDH rates among 0- to 4-y-olds in Victoria at the postcode level. The study highlights the importance of considering 3 interacting factors—access to CWF, access to OHPs, and SES—in efforts to reduce PPDH rates in young children. Knowledge Transfer Statement: Extending access to water fluoridation, increasing the availability of dental services, and raising disadvantaged families’ socioeconomic status are each likely to decrease the rate of dental general anesthetics in young children.
35
FRYE, MARSHALL, SHANGRADHANVA E. VASISTH, AMALIE ATASSI, DAVID MAZYCK, and JUAN C. NINO. "EFFECT OF DEGREE OF SULFONATION IN NANOCELLULOSE/CHITOSAN COMPOSITE ON ADSORPTION OF CATIONIC DYE AS OPIOID SIMULANT." Cellulose Chemistry and Technology 55, no. 1-2 (February 12, 2021): 87–99. http://dx.doi.org/10.35812/cellulosechemtechnol.2021.55.09.
Full textAbstract:
In this study, the effect of nanocellulose sulfonate group content on adsorption of an opioid simulant was tested. The opioid simulant used was Victoria blue R, an amine dye. Nanocellulose filters were fabricated by crosslinking cellulose nanocrystals (CNCs) with chitosan to improve the mechanical stability of freeze-dried CNCs. Thermogravimetric analysis confirmed the filter’s thermal stability and operating temperatures. Conductometric titration, Fourier transform infrared spectroscopy, and scanning electron microscopy techniques were used to characterize the degree of nanocellulose functionalization. Lastly, the adsorption performance of the sulfonated nanocellulose filter was tested and fitted to kinetic models and adsorption isotherms. The adsorption of the dye by the sulfonated nanocellulose followed pseudo-second order kinetics and the Langmuir isotherm. The maximum adsorption of Victoria blue R dye by sulfonated nanocellulose (68.56 mg/g) is significantly higher than those of other adsorbents, like activated carbon (0.59-2.97 mg/g) and magnetic microparticles (40.98 mg/g). Thus, sulfonated cellulose nanocrystals are a promising material for the sequestration of opioids from water.
36
Makaka, R. R., Shepherd Misi, Mhosisi Masocha, and Richard Kimwaga. "Spatial and Temporal Variation of Selected Water Quality Parameters in the Tanzanian Side of Lake Victoria." Tanzania Journal of Engineering and Technology 40, no. 2 (February 20, 2022): 1–23. http://dx.doi.org/10.52339/tjet.v40i2.729.
Full textAbstract:
Lake Victoria’s water quality is increasingly becoming under heavy pressure mainly due to land based activities and aerial inputs which are taking place within the basin. This study was carried out to assess the spatial, including vertical and temporal, variation of the water quality of Lake Victoria on the Tanzanian side. Historical water quality data for the period from 2000 to 2016 was collected. Temperature, pH, Dissolved Oxygen (DO) and Turbidity were selected for study since they are the mostly measured and monitored water quality parameters. Land use-land cover changes were analysed using ArcGIS. ILWIS 3.7 software was used to classify the land use and land cover for the years 2000, 2010 and 2014. MERIS was used to analyse the spatial variation. One-way ANOVA was employed to test the significant variation between different parameters. The results showed that, for the pelagic zone, the range of temperature, pH, DO, and turbidity were 22.8 oC-28.68 oC, 6.3-10.52, 3.42-10.21 mg/l, 1.0 NTU-15.8 NTU respectively. The corresponding values for the littoral zones were 22.3 oC-26.8 oC, 6.47-10.16, 3.99-8.6 mg/l, 1.3-347 NTU respectively. The ANOVA analysis results show that there was a significant variation of NO3(p<0.01). Temperature, pH and DO decreased with the lake depth to the bottom for both zones. For the littoral zone, a strong correlation was observed between temperature and depth, temperature and DO, and between temperature and pH with R2=0.6, p<0.03, R2=-0.78, p<0.01 and R2=0.96, p<0.01, respectively. The bare soil, urban settlements and farm land increased by 38.9%, 8.4% and 10.7% respectively from the year 2000 to 2014 on the Tanzanian side. This could have led to water quality changes. Water quality parameters varied significantly between pelagic and littoral zones. Littoral zones are mostly polluted and thus should be the priority pollution control intervention areas.
37
Marshall, Adam John. "Variation in growing season water balance in central Victoria, Australia, in relation to large-scale climate drivers." Journal of Southern Hemisphere Earth Systems Science 69, no. 1 (2019): 131. http://dx.doi.org/10.1071/es19007.
Full textAbstract:
The precipitation and evaporation records from 1972 to 2013 were analysed at five stations in central Victoria, Australia. The stations formed a north-south transect of sites across a distinct climatic gradient spanning the dry inland plains, the Great Dividing Range and the southern coastal zone. The focus was on the March–November ‘Growing Season’ when typically higher available moisture is critical for a variety of agricultural practices and water management across the region. Growing season rainfall trends were fairly consistent across all stations with ongoing declines generally observed in all months with the exception of November, with the most notable declines in April, May and October. Pan evaporation recorded display greater variation between stations with both significant positive and negative trends evident within the season across the station network. The influence of El Niño–Southern Oscillation and Indian Ocean Dipole on rainfall and pan evaporation was statistically significant, increasing through winter and peaking in spring at all stations. The Southern Annular Mode displayed marked intraseasonal influence which appeared to be highly location dependent. Interestingly, the tropical climate drivers displayed a stronger relationship with pan evaporation than rainfall over the analysis period. This highlighted the potential benefits of taking a broader terrestrial water balance (TWB) perspective of both pan evaporation and rainfall, a concept previously termed ‘Effective Rainfall’. Critically, this study shows the importance of understanding regional variation in TWB elements with respect to local topography and geographic location, as well as intraseasonal variations within the overall growing season.
38
Gillespie, GR, and GJ Hollis. "Distribution and habitat of the spotted tree-frog, Litoria spenceri Dubois (Anura : Hylidae), and an assessment of potential causes of population declines." Wildlife Research 23, no. 1 (1996): 49. http://dx.doi.org/10.1071/wr9960049.
Full textAbstract:
An extensive survey of the distribution and abundance of the spotted tree frog, Litoria spenceri, was conducted throughout its range in the Central and Eastern Highlands of Victoria and parts of New South Wales and the Australian Capital Territory between November 1991 and April 1994. Of the 64 streams surveyed, Litoria spenceri was recorded along 16, 15 in Victoria and one in New South Wales. The species was located along six streams in which it had not been recorded before, but could not be found along four streams in which it had previously been recorded. The survey failed to detect L. spenceri at historical sites on four other streams but located it elsewhere along those streams. Frogs were located predominantly in association with rocky banks adjacent to fast flowing water. Most populations occurred in dissected mountainous country, generally in areas with limited access and disturbance. Analysis of disturbance histories at individual sites and within catchments supporting the species indicates an association between the contraction in distribution and a number of human disturbances to forest and riparian habitats.
39
Chang, Susan Soon Mee, and Joan Ozanne-Smith. "Drowning mortality in children aged 0–14 years in Victoria, Australia: detailed epidemiological study 2001–2016." Injury Prevention 26, no. 6 (August 17, 2019): 593–98. http://dx.doi.org/10.1136/injuryprev-2019-043307.
Full textAbstract:
BackgroundMajor reductions in child drowning mortality rates have been observed historically in Victoria, Australia, for the period 1863–2000. Despite this trend, drowning remains the leading cause of unintentional child death in Victoria. This study investigates the residual fatal drowning problem in the Victorian child population (0–14 years) for the period 2001–2016.AimsDescribe the epidemiology of child drowning deaths in the Victorian population in 2001–2016; investigate risk factors and direct antecedents to these deaths.MethodsPopulation-based retrospective case data were extracted from the National Coronial Information System for 16 years (January 2001–December 2016), and case-by-case analysis was conducted. Associated factors were determined using univariate and Poisson analyses.Results88 of 97 cases had information available for analysis, pools were the most frequent location (30%); 70% of all cases occurred between 08:00 and 17:00; most victims were not deliberately in the body of the water (73%), for example, the pool. Supervision lapses included carers leaving the room when the child was in the bath (16/18), siblings left to supervise the child in private pools (7/23), inadequate pool fences (8/23) or faulty/open gates (4/23), or neighbours’ pool spa (4/23). Delays in finding the child occurred when searches occurred elsewhere, before the body of water (21/88) and when carers were asleep (5/88). Fourteen of the 88 children had an intellectual disability or predisposing medical condition. The grouped Poisson analysis demonstrated that age 0–4 years, male gender and rural place of residence were significant. A downward trend in drowning rate continued in this period.Discussion and conclusionsA case-by-case analysis of a drowned population of children identified details of risk factors and antecedents not previously described. Missing data on antecedents were common, likely resulting in undercounting. Further enhancements to systematic data collection are needed. The results support a systems approach to drowning prevention.
40
Khan, S. I., P. Adhikari, Y. Hong, H. Vergara, R. F Adler, F. Policelli, D. Irwin, T. Korme, and L. Okello. "Hydroclimatology of Lake Victoria region using hydrologic model and satellite remote sensing data." Hydrology and Earth System Sciences 15, no. 1 (January 14, 2011): 107–17. http://dx.doi.org/10.5194/hess-15-107-2011.
Full textAbstract:
Abstract. Study of hydro-climatology at a range of temporal scales is important in understanding and ultimately mitigating the potential severe impacts of hydrological extreme events such as floods and droughts. Using daily in-situ data over the last two decades combined with the recently available multiple-years satellite remote sensing data, we analyzed and simulated, with a distributed hydrologic model, the hydro-climatology in Nzoia, one of the major contributing sub-basins of Lake Victoria in the East African highlands. The basin, with a semi arid climate, has no sustained base flow contribution to Lake Victoria. The short spell of high discharge showed that rain is the prime cause of floods in the basin. There is only a marginal increase in annual mean discharge over the last 21 years. The 2-, 5- and 10- year peak discharges, for the entire study period showed that more years since the mid 1990's have had high peak discharges despite having relatively less annual rain. The study also presents the hydrologic model calibration and validation results over the Nzoia basin. The spatiotemporal variability of the water cycle components were quantified using a hydrologic model, with in-situ and multi-satellite remote sensing datasets. The model is calibrated using daily observed discharge data for the period between 1985 and 1999, for which model performance is estimated with a Nash Sutcliffe Efficiency (NSCE) of 0.87 and 0.23% bias. The model validation showed an error metrics with NSCE of 0.65 and 1.04% bias. Moreover, the hydrologic capability of satellite precipitation (TRMM-3B42 V6) is evaluated. In terms of reconstruction of the water cycle components the spatial distribution and time series of modeling results for precipitation and runoff showed considerable agreement with the monthly model runoff estimates and gauge observations. Runoff values responded to precipitation events that occurred across the catchment during the wet season from March to early June. The spatially distributed model inputs, states, and outputs, were found to be useful for understanding the hydrologic behavior at the catchment scale. The monthly peak runoff is observed in the months of April, May and November. The analysis revealed a linear relationship between rainfall and runoff for both wet and dry seasons. Satellite precipitation forcing data showed the potential to be used not only for the investigation of water balance but also for addressing issues pertaining to sustainability of the resources at the catchment scale.
41
Coleman, Noël, Wilfred Cuff, John Moverley, Anne S. H. Gason, and Simon Heislers. "Depth, sediment type, biogeography and high species richness in shallow-water benthos." Marine and Freshwater Research 58, no. 3 (2007): 293. http://dx.doi.org/10.1071/mf06098.
Full textAbstract:
Until recently, quantitative data on the benthic fauna along the coast of Victoria, south-east Australia, were restricted to those few areas (potentially) receiving commercial and industrial effluent. Collectively, studies in these areas covered ~50 to 60 km of a coastline that extends for 1000 km. Recently, samples were taken from depths of 10, 20 and 40 m along the entire coast, and analysis of these made it possible to examine benthic community structure throughout the region. Species richness is high along the entire length of the coast, supporting the argument that species richness in temperate areas is not always higher in the deep sea than in shallow water. The major factor influencing species richness was depth. Although slightly more individuals were collected from stations at 10-m depth than from stations at 40-m depth, almost three times as many species were found at the deeper stations. Sediment type also influenced species richness. For the stations at 40-m depth, species richness was ~25% higher in medium and coarse sands than in fine sand. Pattern analysis suggested some bioregionalisation of the fauna, but the effect of geographical location on affinities among sample stations was much less than the effects of depth and sediment type.
42
Opere, A. O., and B. N. Okello. "Hydrologic analysis for river Nyando using SWAT." Hydrology and Earth System Sciences Discussions 8, no. 1 (February 9, 2011): 1765–97. http://dx.doi.org/10.5194/hessd-8-1765-2011.
Full textAbstract:
Abstract. The Nyando River is one of the major Rivers in the Lake Victoria Basin. It drains parts of Nandi, Kericho and Nyando districts. It has a catchment area of about 3600 km−2 of Western Kenya and an average discharge of approximately 15 m3 s−1, and has within it some of the most severe problems of environmental degradation and deepening poverty found anywhere in Kenya. The Nyando River drains into the Winam Gulf of Lake Victoria and is a major contributor of sediment. The primary role of GIS in hydrological modeling is to integrate the ever increasing volumes of diverse spatial and non spatial data. This can be the model input or output. Recent advance in GIS (hardware and software) technology offer unprecedented capabilities for storing and manipulating large quantities of detailed, spatially-distributed watershed data (ASCE, 1999). SWAT, which is an interface of Arc View GIS, uses Arc View to prepare input data and display the model output as spatial maps, charts or time series data. This makes it easy to study and display the information for assimilation by SWAT. SWAT is a continuous time model that operates on a daily/sub-daily time step. It is physically based and can operate on large basins for long periods of time (Arnold et al., 1998). The basic model inputs are rainfall, maximum and minimum temperature, radiation, wind speed, relative humidity, land cover, soil and elevation (DEM). The watershed is subdivided into sub-basins that are spatially related to one another. Routing in stream channel is divided in to Water, Sediment, nutrients and organic chemical routing (Neitsch et al., 2002a). Stream flow data was available for two Stations 1GD03 and 1GD07. The stations had data ranging from 1950 to 1997, though they had missing gaps. Rainfall data were available for twelve rainfall recording stations in and around the basin. The collected data ranges between 1960 and 2000 though there were quite a number of missing data. The other weather data used were temperature data (maximum and minimum) for Kericho and Kisumu Meteorological stations. During the study the available water capacity (SOL_AWC) was varied within the range of ±0.05 mm of water/mm of soil. The result showed that SOL_AWC affects the stream flow. SOL_AWC affects both the surface flow and base flow. An increase in SOL_AWC results in decrease on the stream flow because of increase in the ability of the soil to hold more water. An increase in the initial curve number (CN2) increases the stream flow, but the effect is more pronounced on the effects on surface run off. The slightly increase in total stream flow could be as a result of ration of surface run off to base flow. The amount of stream flow contributed by the base flow was more than 50% of the total stream flow as show by base flow separation. The goodness of fit between observed and simulated stream flow was assessed for the aforementioned (1GD03) station, the R2 was found to be 0.24 while the NSE was 0.46 respectively. The low value of R2 and NSE could be attributed to lots of data gaps in the station and also the effects of combined tributaries. The station is located about 10 km upstream of Ahero Bridge just before the flood plain. The model over estimated the low flows at this station while the high flows were well estimated. The performance of the model varied depending on the available input data. The coefficient of determination R2 varies for observed and simulated stream flow at River gauging Station. The relationship between land use/cover change and stream flow is very significant in Nyando basin. The observation made is that with decreased Forest Cover up to 0% there is increased stream flow mean and peak and increased forests cover i.e. 100% results in decreased mean and peak stream flow.
43
Wang, Wei, Yunzhong Shen, Fengwei Wang, and Weiwei Li. "Two Severe Prolonged Hydrological Droughts Analysis over Mainland Australia Using GRACE Satellite Data." Remote Sensing 13, no. 8 (April 8, 2021): 1432. http://dx.doi.org/10.3390/rs13081432.
Full textAbstract:
In recent years, many droughts have happened over mainland Australia, especially the two severe prolonged droughts, from 2006 to 2009 and 2018 to 2020, resulting in serious water scarcity. Therefore, using the Total Storage Deficit Index (TSDI) from the Gravity Recovery and Climate Experiment (GRACE), we analyzed the two severe prolonged droughts from the perspective of the affected area, spatial evolution, frequency, severity and drought driving factors. The results show that the affected area of Drought 2006–2009 ranged from 57% to 95%, and that of Drought 2018–2020 ranged from 45% to 95%. Drought 2006–2009 took its rise in southeastern Australia and gradually spread to the central part. Drought 2018–2020 originated in the southwest corner of the Northern Territory and northern New South Wales, and gradually expanded to Western Australia and the whole New South Wales respectively. During Drought 2006–2009, Victoria suffered drought all months, including 59% mild drought and 41% moderate drought, North Territory had the highest drought severity of 44.26 and Victoria ranked the second high with the severity of 35.51 (cm months). For Drought 2018–2020, Northern Territory was also dominated by drought all months, including 92% mild drought and 8% moderate drought, the drought severities were in North Territory and Western Australia with 52.19 and 31.44 (cm months), respectively. Finally, the correlation coefficients between the two droughts and Indo-Pacific climate variability including El Niño-Southern Oscillation and Indian Ocean Dipole (IOD) are computed. By comparing the correlation coefficients of Drought 2018–2020 with Drought 2006–2009, we find that the impact of the El Niño on the hydrological drought becomes weaker while IOD is stronger, and the role of Southern Oscillation on droughts is diverse with the quite different spatial patterns. The results from Fourier analysis confirm that the two hydrological droughts are all related to Indo-Pacific climate variability but with slightly different driving mechanisms.
44
Boon, PI, P. Virtue, and PD Nichols. "Microbial consortia in wetland sediments: a biomarker analysis of the effect of hydrological regime, vegetation and season on benthic microbes." Marine and Freshwater Research 47, no. 1 (1996): 27. http://dx.doi.org/10.1071/mf9960027.
Full textAbstract:
Microbial consortia in the sediments from a permanent wetland near Albury-Wodonga in north-eastern Victoria, Australia (Ryans 1 Billabong), and an ephemeral wetland near Shepparton in central Victoria (Raftery's Swamp) were quantified by analyses of phospholipid fatty acid (PLFA), polar lipid ether lipid (PLEL), sterol and alcohol profiles. Prokaryotic organisms dominated the benthic assemblages in both wetlands. Total prokaryotic abundance (i.e. eubacteria plus archaea) was estimated to be (7-17) × 109 cells g-1 sediment (dry weight). Methanogenic archaea were estimated to number (1-5.4) × 109 cells g-1 and to account for 11-36% of the total benthic prokaryotes; these values are apparently among the highest recorded for temperate lake or river environments. PLFAs indicative of specific metabolic groups (e.g. sulfate-reducing bacteria (SRB), methanotrophic bacteria, etc.) were also detected. The PLFA profiles indicated that Type I methanotrophs (abundant in C16 PLFAs) were more abundant than the Type II group, which contain C18 PLFAs. Acetate-utilizing SRB were more abundant than were lactate-utilizing SRB, but neither group was dominant. Ergosterol was not detected, which suggested that fungi were not a significant component of the benthic microbial consortia in spite of both wetlands having abundant inputs from aquatic and fringing vascular plants. Other biomarkers, such as sterols, long-chain alcohols, triterpenoids and phytol, demonstrated inputs from these higher plants. PLFA, PLEL and sterol profiles indicated that benthic microbial consortia were affected by hydrological regime, the presence of aquatic vegetation, and season. Information from this preliminary study may assist in the making of informed management decisions on environmental water allocations for natural ecosystems.
45
Noor, Farhana, Orpita U. Laz, Khaled Haddad, Mohammad A. Alim, and Ataur Rahman. "Comparison between Quantile Regression Technique and Generalised Additive Model for Regional Flood Frequency Analysis: A Case Study for Victoria, Australia." Water 14, no. 22 (November 11, 2022): 3627. http://dx.doi.org/10.3390/w14223627.
Full textAbstract:
For design flood estimation in ungauged catchments, Regional Flood Frequency Analysis (RFFA) is commonly used. Most of the RFFA methods are primarily based on linear modelling approaches, which do not account for the inherent nonlinearity of rainfall-runoff processes. Using data from 114 catchments in Victoria, Australia, this study employs the Generalised Additive Model (GAM) in RFFA and compares the results with linear method known as Quantile Regression Technique (QRT). The GAM model performance is found to be better for smaller return periods (i.e., 2, 5 and 10 years) with a median relative error ranging 16–41%. For higher return periods (i.e., 20, 50 and 100 years), log-log linear regression model (QRT) outperforms the GAM model with a median relative error ranging 31–59%.
46
Bbosa, Naziriwo Betty, Wandiga Shem Oyoo, and Gatari Michael Gichuru. "Use of TXRF and Convectional Energy Dispersive X-ray Fluorescence Analysis (EDXRF) to determine trace metal concentrations in waters of Nakivubo Channel and Lake Victoria." Lakes & Reservoirs: Research & Management 15, no. 2 (June 29, 2010): 101–10. http://dx.doi.org/10.1111/j.1440-1770.2010.00426.x.
Full text
47
Valadares de Amorim, Giovana, Beatrixe Whittome, Benjamin Shore, and David B. Levin. "Identification of Bacillus thuringiensis subsp.kurstaki Strain HD1-Like Bacteria from Environmental and Human Samples after Aerial Spraying of Victoria, British Columbia, Canada, with Foray 48B." Applied and Environmental Microbiology 67, no. 3 (March 1, 2001): 1035–43. http://dx.doi.org/10.1128/aem.67.3.1035-1043.2001.
Full textAbstract:
ABSTRACT Aerial applications of Foray 48B, which contains Bacillus thuringiensis strain HD1, were carried out on 9 to 10 May, 19 to 21 May, and 8 to 9 June 1999 to control European gypsy moth (Lymantria dispar) populations in Victoria, British Columbia, Canada. A major assessment of the health impact of B. thuringiensis subsp. kurstaki was conducted by the Office of the Medical Health Officer of the Capital Health Region during this period. Environmental (air and water) and human (nasal swab) samples, collected before and after aerial applications of Foray 48B, both in the spray zone and outside of the spray zone, were analyzed for the presence of strain HD1-like bacteria. Random amplified polymorphic DNA analysis, cry gene-specific PCR, and dot blot DNA hybridization techniques were used to screen over 11,000 isolates of bacteria. We identified bacteria with genetic patterns consistent with those of B. thuringiensis subsp.kurstaki HD1 in 9,102 of 10,659 (85.4%) isolates obtained from the air samples, 13 of 440 (2.9%) isolates obtained from the water samples, and 131 of 171 (76.6%) isolates from the nasal swab samples. These analyses suggest that B. thuringiensissubsp. kurstaki HD1-like bacteria were present both in the environment and in the human population of Victoria prior to aerial applications of Foray 48B. The presence of B. thuringiensissubsp. kurstaki HD1-like bacteria in human nasal passages increased significantly after the application of Foray 48B, both inside and outside the spray zone.
48
Kiptum, C. K., L. Rosasi, O. Joseph, and E. Odhiamba. "SOME MECHANICAL CHARACTERISTICS OF CONCRETE REINFORCED WITH DRIED WATER HYACINTH AND QUARRY DUST AS FINE AGGREGATES." Journal of Civil Engineering, Science and Technology 10, no. 2 (September 29, 2019): 94–100. http://dx.doi.org/10.33736/jcest.1451.2019.
Full textAbstract:
This paper presents some mechanical properties of concrete reinforced with dry water hyacinth stem and quarry dust as fine aggregates. Fresh water hyacinth stems were collected from Lake Victoria; sun dried for a week and chopped into 3 cm long pieces. Sieve analysis was done for fine and coarse aggregates. Concrete mix designs were done according to Department of Environment (United Kingdom) method. A total of 32 cubes of concrete were cast (16 horizontal orientations of fiber, and 16 vertical orientations of fibers). Dry water hyacinth stems were incorporated during casting of cubes in terms of 0%, 0.1%, 0.2% and 0.3% of the volume of cube. Average compressive and split tensile strength tests were performed after 28 days. The results showed concrete composed of horizontal orientation of dry water hyacinth stem fibers had an average optimum tensile strength of 1.5 N/mm2 corresponding to 0.1% replacement. In vertical orientation, there was uniform decrease in tensile strength as the percentage replacement increased. Compressive strengths decreased slightly as the composition of water hyacinth fibers increased for both vertical and horizontal orientations.
49
Mule, Shadrack, Charles Nguta, Geoffrey Kamau, Gilbert Ongera, Phanice Wangila, Joyce Kiplimo, and Dennis Chirchir. "Retention efficiencies of halogenated and non-halogenated hydrocarbons in selected wetland ecosystem in Lake Victoria Basin." International Journal of Environment 4, no. 2 (June 3, 2015): 38–52. http://dx.doi.org/10.3126/ije.v4i2.12623.
Full textAbstract:
The determination of retention efficiencies of halogenated and non-halogenated hydrocarbon in selected wetland ecosystems in Lake Victoria basin was carried out. Qualitative and quantitative determination of the presence of residual hydrocarbons in Kigwal/Kimondi, Nyando and Nzoia wetland ecosystems using Gas Chromatography - Mass Spectrometer (GC-MS) instrument indicated the presence of residual organochlorines, organophosphorus, carbamates and synthetic pyrethroid hydrocarbons in water, sediment and plant materials. In order to compare the retention efficiencies of the wetlands, the wetland ecosystems were divided into three different sections, namely: inlet, mid and outlet. Calculations of mass balances of residual halogenated and non-halogenated hydrocarbons at the respective sections was done taking into account the partition of the studied compounds in samples of water, sediments and papyrus reed plant materials and analyzed using validated Gas Chromatography - Mass Spectrometer (GC-MS) method. From the analysis, several residual hydrocarbons namely: bendiocarb, benzene hexachloride (BHC), carbaryl, cypermethrin, decis, deltamethrin, diazinon, dieldrin, DDT, DDD, DDE, malathion, propoxur, sumithion, 5-phenylrhodanine, 1,3,5-trichlorobenzene, 1-(2-phenoxybenzyl)hydrazine were detected and quantified. The levels of the selected residual hydrocarbons in water samples were used to calculate the retention efficiencies of a specific hydrocarbon and the values recorded. Generally, River Nyando wetland recorded mean percentage retention efficiencies of 76 and 94% for dry and rainy seasons respectively; Kigwal/Kimondi wetland had seasonal mean percentage retention efficiencies of 63 to 78%. River Nzoia also had calculated seasonal mean percentage retention efficiencies of between 56 to 88%. Dry season had lower mean percentages retention efficiencies as compared to rainy season in the three wetlands of interest during the period of study. The study observed that retention efficiencies of tropical wetland ecosystems is greatly affected by its concentration within the wetland tank systems, anthropogenic activities, physical properties of the hydrocarbon, and environmental conditions among others. There are several anthropogenic activities which contributed to the presence of hydrocarbons in the wetlands and they included: agricultural, municipal, industrial and public health activities. DOI: http://dx.doi.org/10.3126/ije.v4i2.12623 International Journal of Environment Vol.4(2) 2015: 38-52
50
Myers, BA, DH Ashton, and JA Osborne. "The Ecology of the Mallee Outlier of Eucalyptus behriana F. Muell. Near Melton, Victoria." Australian Journal of Botany 34, no. 1 (1986): 15. http://dx.doi.org/10.1071/bt9860015.
Full textAbstract:
An outlier of mallee vegetation occurs south of the Great Dividing Range in Victoria in a rain shadow region (annual rainfall approx. 500 mm) about 50 km west of Melbourne. A Eucalyptus behriana open-scrub with a sparse understorey of chenopods, mosses, lichens and some grasses occurs on solonetz soil on lateritized Tertiary sandy clays and on skeletal soils on Ordovician slates and sandstones. The dryness of the mallee site is probably exacerbated by the smaller rate of water infiltration and greater salinity of the solonetz soil under E. behriana compared with the solodic soil, in the moister area further north, under an open-forest of E. microcarpa. The multistemmed habit of E. behriana appears to be partly genetically fixed. Hollow lignotuberous rings, filled to a depth of about 15-25 cm with brown, nutrient-rich humus, are common. Pattern analysis of the distribution of stems of E. behriana indicated strong clumping at about 9 m², due to the multistemmed habit, and weaker clumping at about 600 m², which correlated with the size of groups of dense, spindly individuals of E. behriana, resulting from a past phase of gap regeneration.