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Literatura académica sobre el tema "Mary River"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 20 de febrero de 2023

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Artículos de revistas sobre el tema "Mary River"

Rood, Stewart B., John M. Mahoney, David E. Reid, and Leslie Zilm. "Instream flows and the decline of riparian cottonwoods along the St. Mary River, Alberta." Canadian Journal of Botany 73, no. 8 (August 1, 1995): 1250–60. http://dx.doi.org/10.1139/b95-136.

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Completed in 1951, the St. Mary Dam enables water storage and diversion for irrigation; river flows downstream are consequently dramatically reduced during summer months. To assess historical changes in the abundance of riparian cottonwoods (Populus balsamifera, Populus angustifolia, and a few Populus deltoides), airphoto analyses were conducted for 40-km river reaches upstream and downstream from the dam and along adjacent dammed and undammed rivers. Cottonwoods along the lower St. Mary River are confined by steep-walled canyons to narrow bands and consequently analyses of the lineal river distance associated with cottonwoods were conducted. These revealed a 68% decline from 1951 to 1985. The decline was progressive, with 28.9, 27.6, 15.1, and 7.6% of the reach associated with cottonwoods in 1951, 1961, 1981, and 1985, respectively. Ground surveys from 1985 to 1994 indicated further decline after 1985 and an absence of cottonwood seedlings and saplings. Cottonwood stands upstream from the St. Mary Dam and along adjacent rivers are more extensive and analyses of the areal extent of stands were consequently appropriate. These indicated minor change along the upper St. Mary (−0.5%), the upper (+1.9%) and lower Waterton (+3.5%), and the upper Belly (−9.1%) rivers, and an increase in forest abundance along the lower Belly River (+52.2%), between 1951 and 1985. Thus, the decline of cottonwoods along the lower St. Mary River was not symptomatic of a general pattern of decline in the region. Analyses of historical stream flows indicated that the cottonwood mortality was drought induced as a result of insufficient flows during the hot, dry summer periods and abrupt flow reductions following the high-flow period in the late spring. The riparian water table was determined to be closely coordinated with river stage, as changes in river elevation were followed by quantitatively similar changes in water table depth. Along the St. Mary River, reduced sedimentation downstream from the dam was not considered to be responsible for the cottonwood decline. The historically sparse cottonwood abundance along the lower St. Mary River may have reflected environmental conditions that were naturally only marginally suitable, and those groves may have been particularly vulnerable to the impacts of river flow regulation. Key words: Populus, cottonwoods, instream flows, mortality, riparian vegetation.

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Saintilan, Neil. "Mangrove environments of the Mary River." Wetlands Australia 15, no. 1 (January 23, 2010): 31. http://dx.doi.org/10.31646/wa.193.

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O'Dea, Michael. "The River Took Me, and: Mary Byrne." Prairie Schooner 85, no. 4 (2011): 156–57. http://dx.doi.org/10.1353/psg.2011.0127.

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Rood, Stewart B., and Sig Heinze-Milne. "Abrupt downstream forest decline following river damming in southern Alberta." Canadian Journal of Botany 67, no. 6 (June 1, 1989): 1744–49. http://dx.doi.org/10.1139/b89-221.

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The influence of river damming on the abundance of riparian poplar forests was investigated by comparing forest abundances on the dammed St. Mary and Waterton rivers of southern Alberta with the neighbouring undammed Belly River. Forest distributions were determined by estimating the linear river distance of forests from airphotos taken in 1961 and 1981, both upstream and downstream from the dams. During the 20-year interval, a 48% reduction occurred downstream from the St. Mary Dam, which was completed in 1951. Downstream from the Waterton Dam, completed in 1964, riparian forests declined 23 %. Poplar abundance along the downstream region of the undammed Belly River was relatively unchanged over the study period, showing less than a 1 % reduction. The upstream (undammed) portions of all three rivers underwent a slight forest decline during the 20-year interval; declines of 4.7, 4.6, and 6.1 % occurred along the St. Mary, Belly, and Waterton rivers, respectively. Thus, the damming of two rivers in southern Alberta has been followed by a rapid and dramatic downstream decline in riparian forests. Further, the close association between the location and extent of the forest decline supports a causal relationship between the river damming and the forest decline. Possible causes of the decline are discussed, including drought-induced mortality, particularly of seedlings.

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Moore, B. R., D. J. Welch, and C. A. Simpfendorfer. "Spatial patterns in the demography of a large estuarine teleost: king threadfin, Polydactylus macrochir." Marine and Freshwater Research 62, no. 8 (2011): 937. http://dx.doi.org/10.1071/mf11034.

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Understanding spatial patterns in demographic parameters of exploited fish species is of critical importance to effective fisheries management. In the present study, patterns in demography of a large, protandrous, estuarine teleost, king threadfin, Polydactylus macrochir, were compared among three estuaries on the eastern coast of Queensland, Australia. Significant variation in age and growth was observed between fish from the Fitzroy River and those from the Mary and Brisbane Rivers, with Fitzroy River fish living longer (22 years v. 10 and 14 years, respectively), reaching a greater asymptotic length (1222-mm fork length (FL) v. 975- and 1047-mm FL, respectively), and attaining greater length-at-ages of 6 years and beyond. No difference in growth was detected between Mary and Brisbane River fish, or in total mortality among any of the sites. Fitzroy River fish were generally found to mature and change sex at greater lengths and ages than those from the Mary and Brisbane Rivers. The observed variability suggests that spatially segregated populations of P. macrochir may respond differently to fishing pressure and highlights the importance of understanding the spatial patterns in demography of exploited estuarine fish populations.

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MacDonald, Ryan J., James M. Byrne, Stefan W. Kienzle, and Robert P. Larson. "Assessing the Potential Impacts of Climate Change on Mountain Snowpack in the St. Mary River Watershed, Montana." Journal of Hydrometeorology 12, no. 2 (April 1, 2011): 262–73. http://dx.doi.org/10.1175/2010jhm1294.1.

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Abstract The St. Mary River watershed is an important international watershed that supplies irrigation water to large portions of southern Alberta, Canada, and northern Montana. The St. Mary River is fully allocated and users on both sides of the border are concerned regarding declining water supplies and increasing water demands under climate warming. Water supply in the St. Mary River is largely from snowpack in the mountainous portion of the watershed. This work assesses potential future changes in snowpack for the St. Mary River watershed under a range of general circulation model (GCM) derived future climate scenarios. The Generate Earth Systems Science (GENESYS) input spatial hydrometeorological model is used to simulate potential changes in spring snowpack, the onset of melt, and changes in snow extent for three 30-yr periods centered around 2025, 2055, and 2085. Results suggest an earlier spring and associated earlier onset of snowmelt and probable declines in maximum annual snow water equivalent (SWE) over the St. Mary River watershed are likely under most future climate scenarios used in this study. However, results are responsive to future climate scenarios, where a scenario with substantial global greenhouse gas (GHG) emission controls shows a much lower decline in total accumulated SWE over the St. Mary River watershed. Without substantial GHG emission reductions, the study does show that there could be significant changes in snowpack over the St. Mary River watershed in the future.

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Espinoza, T., CL Burke, L. Carpenter-Bundhoo, S. Marshall, D. Roberts, and MJ Kennard. "Fine-scale acoustic telemetry in a riverine environment: movement and habitat use of the endangered Mary River cod Maccullochella mariensis." Endangered Species Research 42 (July 23, 2020): 125–31. http://dx.doi.org/10.3354/esr01046.

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Understanding movement and habitat requirements of endangered species is critical to conservation management. We evaluate fine-scale acoustic telemetry to study breeding-related movement and habitat use of the endangered Mary River cod Maccullochella mariensis in a riverine environment and, in relation to key environmental variables, to inform management. Movement activity varied significantly in relation to water temperature and diel period, and spatial occupancy and habitat selection varied substantially in relation to the nesting behaviour of Mary River cod. Important nesting habitat included a large hollow log mid-channel and well-shaded logs and log jams adjacent to the river bank. Extrapolating this information to the general population was inhibited by relatively small sample sizes, due in part to the restricted spatial scale of the hydrophone arrays and longitudinal movements of tagged fish beyond the acoustic range of our array. Notwithstanding this, our results demonstrate that (1) fine-scale acoustic telemetry can quantify complex biological behaviours in riverine environments; (2) Mary River cod require specific environmental stimuli and habitat to support the reproductive cycle; and (3) changing environmental conditions may influence Mary River cod behaviour, and understanding this response is necessary for sustainable management. Findings from this study can inform future applications of this methodology in riverine environments and contribute to the development of management strategies and habitat restoration activities supporting the recovery of Mary River cod populations.

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Voris, Jared T., Darla K. Zelenitsky, François Therrien, and Kohei Tanaka. "Dinosaur eggshells from the lower Maastrichtian St. Mary River Formation of southern Alberta, Canada." Canadian Journal of Earth Sciences 55, no. 3 (March 2018): 272–82. http://dx.doi.org/10.1139/cjes-2017-0195.

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North America is known for its rich uppermost Cretaceous record of dinosaur egg remains, although a notable fossil gap exists during the lower Maastrichtian. Here we describe a diverse dinosaur eggshell assemblage from the St. Mary River Formation of southern Alberta that, in conjunction with recently described eggs from the same formation in Montana, helps fill this gap and sheds light on the dinosaur diversity in this poorly fossiliferous formation. Three theropod eggshell types (Continuoolithus cf. C. canadensis, Montanoolithus cf. M. strongorum, and Prismatoolithus cf. P. levis) and one ornithopod (Spheroolithus cf. S. albertensis), are reported from Albertan exposures of the St. Mary River Formation, increasing the ootaxonomic diversity of the formation from two to five ootaxa. The taxonomic composition of the eggshell assemblage is consistent with the dinosaurian fauna known from the St. Mary River Formation based on skeletal remains. Spheroolithus eggshells constitute the majority of identifiable eggshells in our assemblage, a trend also observed in several other Upper Cretaceous formations from North America. Continuoolithus is shown to be synonymous with Spongioolithus, thus expanding the Maastrichtian geographic range of the ootaxon to include Utah. The St. Mary River eggshell assemblage supports a general trend of increase in eggshell thickness among theropod ootaxa from the uppermost Santonian through the Maastrichtian, which is inferred to reflect an increase in body size among some clades of small theropods through the Upper Cretaceous. Eggshell preservation in the St. Mary River Formation may be related to the semiarid climatic and environmental conditions that prevailed.

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Hunter, John P., Ronald E. Heinrich, and David B. Weishampel. "Mammals from the St. Mary River Formation (Upper Cretaceous), Montana." Journal of Vertebrate Paleontology 30, no. 3 (May 18, 2010): 885–98. http://dx.doi.org/10.1080/02724631003763490.

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Knighton, A. David, Colin D. Woodroffe, and Kevin Mills. "The evolution of tidal creek networks, mary river, northern Australia." Earth Surface Processes and Landforms 17, no. 2 (March 1992): 167–90. http://dx.doi.org/10.1002/esp.3290170205.

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Tesis sobre el tema "Mary River"

MacDonald, Ryan J., and University of Lethbridge Faculty of Arts and Science. "Modelling the potential impacts of climate change on snowpack in the St. Mary River watershed, Montana." Thesis, Lethbridge, Alta. : University of Lethbridge, Dept. of Geography, c2008, 2008. http://hdl.handle.net/10133/2511.

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Climate change poses significant threats to mountain ecosystems in North America (Barnett et al., 2005) and will subsequently impact water supply for human and ecosystem use. To assess these threats, we must have an understanding of the local variability in hydrometeorological conditions over the mountains. This thesis describes the continued development and application of a fine scale spatial hydrometeorological model, GENESYS (GENerate Earth SYstems Science input). The GENESYS model successfully simulated daily snowpack values for a 10 year trial period and annual runoff volumes for a thirty year period. Based on the results of these simulations the model was applied to estimate potential changes in snowpack over the St. Mary River watershed, Montana. GCM derived future climate scenarios were applied, representing a range of emissions controls and applied to perturb the 1961-90 climate record using the “delta” downscaling technique. The effects of these changes in climate were assessed for thirty year time slices centered on 2020s, 2050s, and 2080s. The GENESYS simulations of future climate showed that mountain snowpack was highly vulnerable to changes in temperature and to a lesser degree precipitation. A seasonal shift to an earlier onset of spring melt and an increase in the ratio of rain to snow occurred under all climate change scenarios. Results of mean and maximum snowpack were more variable and appeared to be highly dependent on scenario selection. The results demonstrated that although annual volume of available water from snowpack may increase, the seasonal distribution of available water may be significantly altered. viii, 93 leaves ; 29 cm

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Stewart-Koster, Ben Donald. "Modelling Multiscale Relationships in Riverine Landscapes: Putting the "Riverscape" into Statistical Models for River Ecology and Management." Thesis, Griffith University, 2011. http://hdl.handle.net/10072/367114.

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Many questions in ecology involve exploring the environmental processes that influence species’ distributions and abundances in both space and time. Such environmental processes are rarely independent, and generally operate across many scales. This is particularly relevant to riverine systems, where the nested hierarchical structure of the riverscape means fine-scale processes are strongly influenced by processes operating across larger scales. Recent research has identified some key advantages in applying Bayesian hierarchical models to hierarchical ecological problems such as identifying relationships between species’ abundances and environmental predictor variables across multiple scales. This thesis focuses on applying Bayesian hierarchical models to multiscale datasets for freshwater fishes and aquatic macrophyte cover in South-East Queensland, Australia, to address two key aspects of applied river ecology and management. Firstly, it examines multiscale species-environment relationships for freshwater fishes. This involves developing Bayesian hierarchical models that reflect the structure of a conceptual model of fish species’ distribution and abundance. Secondly, this thesis examines methods to integrate such multiscale relationships into models for river management and restoration using Bayesian networks with an emphasis on the management of aquatic macrophytes (BNs). Novel statistical methods such as Bayesian hierarchical models and BNs have the potential to advance our understanding of multiscale abiotic drivers of ecosystem structure and function across the riverscape. Thesis (PhD Doctorate) Doctor of Philosophy (PhD) Griffith School of Environment Science, Environment, Engineering and Technology Full Text

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Larson, Robert, and University of Lethbridge Faculty of Arts and Science. "Modelling climate change impacts on mountain snow hydrology, Montana-Alberta." Thesis, Lethbridge, Alta. : University of Lethbridge, Faculty of Arts and Science, 2008, 2008. http://hdl.handle.net/10133/669.

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A modelling approach focused on snow hydrology was developed and applied to project future changes in spring streamflow volumes in the St. Mary River headwaters basin, Montana. A spatially distributed, physically-based, hydrometeorological and snow mass balance model was refined and used to produce snow water equivalent (SWE) and rainfall surfaces for the study watershed. Snowmelt runoff (SR) and effective rainfall runoff (RR) volumes were compiled for the 1961-2004 historical period. A statistical regression model was developed linking spring streamflow volume (QS) at Babb, Montana to the SR and RR modelled data. The modelling results indicated that SR explained 70% of the variability in QS while RR explained another 9%. The model was applied to climate change scenarios representing the expected range of future change to produce annual QS for the period 2010-2099. Compared to the base period (1961-1990), average QS change ranged from -3% to -12% for the 2020s period. Percent changes increased to between -25% and -32% for the 2050s, and -38% and -55% for the 2080s. Decreases in QS also accompanied substantial advances in the onset of spring snowmelt. Whereas the spring pulse onset on average occurred on April 8 for the base period, it occurred 36 to 50 days earlier during the 2080s. The findings suggest that increasing precipitation will not compensate for the effects of increasing temperature in watershed SWE and associated spring runoff generation. There are implications for stakeholder interests related to ecosystems, the irrigation industry, and recreation. xii, 136 leaves : ill. ; 28 cm. --

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McKenny, Claire, and n/a. "The Diversity of Macroinvertebrate Grazers in Streams: Relationships With the Productivity and Composition of Benthic Algae." Griffith University. Australian School of Environmental Studies, 2005. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20060308.131239.

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There has been much interest in the last decade concerning the factors that influence diversity, especially how diversity and ecosystem processes may be linked. This study was based in small, cobble streams in South East Queensland. Its aim was to determine how the diversity and composition of consumers (the grazer guild) is influenced by both the production and composition of benthic algae, at different spatial scales. It also aimed to ascertain whether this response differs among grazer sub guilds with different dispersal capabilities. Ten sites in the Upper Brisbane and Mary catchments were sampled. The sites were selected to provide a range of productivity and composition. Grazers from these sites included snails and elmids, and larval mayflies, moths, and caddisflies. Grazer diversity and composition appeared to be structured by catchment scale influences, but environmental variables also affected which animals colonised patches and microhabitats (cobbles) within catchments. Primary productivity and algal composition could not be separated, with highly productive reaches also having a high cover of filamentous algal taxa. Grazer diversity displayed strongly positive, linear relationships with algal variables at the reach scale. It had a negative relationship with filamentous algae at the cobble scale, and a non-significant hump-shaped relationship with primary productivity. Survey data alone could not separate whether grazers were responding to habitat or food-related drivers, or to variations in productivity. Experimental manipulation of algal variables at the patch scale, using light and nutrients, also could not clearly uncouple the relationship between primary productivity and filamentous algal cover. Once reach scale variation was removed, grazer diversity displayed hump-shaped relationships with algal variables, including algal diversity. Much of this variation was due to patterns in mobile grazers, as sedentary grazers did not respond to algal variation at this scale. The density of the more mobile taxa showed similar patterns to those at the cobble scale (hump-shaped). A second field experiment was carried out in order to further investigate the responses of invertebrates to algal community composition at the cobble scale. Data from all three chapters suggested that as sites shifted to a dominance of filamentous algae, often with an associated increase in GPP, there was also a shift in the grazer community towards more sedentary grazers and away from the more mobile taxa. This also occurred at the cobble scale in the second experiment. The gut analysis and diet studies in the third chapter indicated that while many grazers consumed filamentous algae, it was not assimilated. This suggests that the preferences for sedentary taxa for cobbles and reaches dominated by filamentous algae are likely to be due to some other, possibly habitat-related, factor such as flow or predation refuge. The study provides a rare examination of relationships between primary productivity and consumer diversity in freshwater streams, and finds support for the pattern found in other systems of monotonic relationships of these two variables at large scales and hump-shaped relationships at smaller scales. It emphasises the importance of understanding other, potentially confounding, aspects of communities of producers, and investigates the possible roles of the most important of these (community composition) in structuring consumer communities in the small cobble streams of South-East Queensland.

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McKenny, Claire. "The Diversity of Macroinvertebrate Grazers in Streams: Relationships With the Productivity and Composition of Benthic Algae." Thesis, Griffith University, 2005. http://hdl.handle.net/10072/368092.

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Henderson, Amanda Olivia. "Low-Shield Volcanism: A Comparison of Volcanoes on Syria Planum, Mars and Snake River Plain, Idaho." BYU ScholarsArchive, 2015. https://scholarsarchive.byu.edu/etd/6138.

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Volcanoes are key indicators of a planet's internal structure, mechanics, and evolutionary history. Consequently, understanding the types and ages of volcanoes on a planet's surface is an important endeavor. In an attempt to better understand the relationship between morphometry and volcanic processes, we compared low-shield volcanoes on Syria Planum, Mars, with basaltic shields of the eastern Snake River Plain. We used 133 volcanoes on Syria Planum that are covered by Mars Orbiting Laser Altimeter (MOLA) and High Resolution Stereo Camera (HRSC) elevation data and 246 eSRP shields covered by the National Elevation Dataset (NED) for this comparison. Shields on Syria Planum average 191 +/- 88 m tall, 12 +/- 6 km in diameter, 16 +/- 28 km3 in volume, and have 1.7° +/- 0.8 flank slopes. eSRP shields average 83 +/- 44 m tall, 4 +/- 3 km in diameter, 0.8 +/- 2 km3 in volume, and have 2.5° +/- 1 flank slopes. Bivariate plots of morphometric characteristics show that Syria Planum and Snake River Plain low shields form the extremes of the same morphospace shared with some Icelandic olivine tholeiite shields, but are generally distinct from other terrestrial volcanoes. Cluster analysis of Syria Planum and Snake River Plain shields with other terrestrial volcanoes separates these volcanoes into one cluster and the majority of them into the same sub-cluster that is distinct from other terrestrial volcanoes. Principal component and cluster analysis of Syria Planum and Snake River Plain shields using height, area, volume, slope, and eccentricity shows that Syria Planum and Snake River Plain low-shields are similar in shape (slope and eccentricity). Apparently, these low shields formed by similar processes involving Hawaiian-type eruptions of low viscosity (mafic) lavas with fissure controlled eruptions, narrowing to central vents. Initially high eruption rates and long, tube-fed lava flows shifted to the development of small lava lakes that repeatedly overflowed, and on some with late fountaining to form steeper spatter ramparts. However, Syria Planum shields are systematically larger than those on the eastern Snake River Plain. The larger size of Syria Planum shields is likely due to the smaller gravity of Mars, requiring larger magma batches to generate sufficient buoyant force to overcome the strength of rocks in the lithosphere and rise to the surface. Thus, Syria Planum lavas erupt in larger volumes and at higher rates generating larger volcanoes with slightly smaller slopes.

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Crues, Tomas Enrique. "The river and the margins : marginality and escclusion in mark twain's old south." reponame:Repositório Institucional da UFSC, 1998. http://repositorio.ufsc.br/xmlui/handle/123456789/77838.

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Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Comunicação e Expressão Made available in DSpace on 2012-10-17T07:58:03Z (GMT). No. of bitstreams: 0Bitstream added on 2016-01-09T00:30:10Z : No. of bitstreams: 1 149150.pdf: 2615219 bytes, checksum: 94ba9a448de8327b3d0c0d044d40beaa (MD5)

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Goodwin, Kevin R. "American Eel Subpopulation Characteristics in the Potomac River Drainage, Virginia." Thesis, Virginia Tech, 1999. http://hdl.handle.net/10919/34036.

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The demographic characteristics of American eels (Anguilla rostrata) are believed to vary with latitude and distance inland from the ocean; eels are generally thought to increase in length, age, and the proportion of females in inland and more northerly areas. Understanding this variation is necessary for the sound management of eels, but investigations into characteristics on a broad scale within drainages are scarce. Eels in the Potomac River drainage, Virginia, were sampled over a two-year period in both near-coastal and inland areas to describe characteristics in each area as well as to understand drainage-wide patterns. Inland data resulted from sampling in the Shenandoah River drainage and near-coastal data resulted from sampling tributaries to the lower Potomac River. Movement and growth were also investigated in inland areas. Eels from the Shenandoah River drainage were significantly longer (median = 763 mm TL) and older (median = 11.5) than those found in the Potomac River tributary sites (median = 142 mm TL; median = 2.0, respectively). Both total length and age increased with increasing distance inland and sex ratio shifted from varying ratios of males:females in Potomac River tributaries to all females in the Shenandoah River drainage. Movements confirmed through mark-recapture over periods ranging up to one year were short, generally <100 m, with the longest detected movement being 1.5 km. Recapture rates were low and may be due either to low sampling efficiency, long-distance movements, or a combination of these factors. Growth and 95% confidence interval from five eels recaptured after approximately one year was 43.0 +/- 29.7 mm/year. CPUE decreased with increasing distance inland, confirming information reported by others for Virginia streams. Master of Science

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Viviers, Joanita. "Seasonal migration and reproductive behaviour of the Common River Frog (Amietia quecketti) / Joanita Viviers." Thesis, North-West University, 2013. http://hdl.handle.net/10394/10212.

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The Common River Frog Amietia quecketti is a well-known and widely distributed species in southern Africa. Despite the fact that it is a common species and quite prevalent in urban areas little is known about its behaviour. The North-West University Botanical Gardens was selected as study area as it supports a healthy population of Common River Frogs at a series of 18 water bodies. Each pond in the Garden was assigned a reference number and the surface area, depth and vegetation were noted. Frogs were located with the aid of strong flashlights. Specimens were caught by hand and transferred to clear plastic bags. Frogs were sexed and their mass and their snout-vent length (SVL) were determined. Frogs were subsequently individually marked by means of injecting a micro-transponder (pit-tag) subcutaneously. Field observations were conducted over two consecutive evenings every two weeks for a period of one year. On the first night all sites were visited and all frogs were scanned and their position, orientation and activity were noted. During the second night focus was on Pond 6 as it sustained the biggest population. Observation started at 19:15 and continued until 02:30. All frogs in and around the pond were scanned and detailed notes were taken, focusing on their orientation, behaviour, calling activity and distance to the nearest other frog. Results showed that limited movement between ponds in the Garden does occur. A number of individuals were recorded regularly. Some males had preferred call sites, and clear circadian and seasonal patterns with regards to males and females exist. The complex call structure consist of a chuck and a whine and then a combination of the two. MSc (Environmental Sciences), North-West University, Potchefstroom Campus, 2013

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Musoke, Elizabeth. "Understanding the adoption of soil and water conservation practices: the role of social capital." Diss., Kansas State University, 2017. http://hdl.handle.net/2097/38221.

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Doctor of Philosophy Environmental Design and Planning Timothy D. Keane Kenya has been adversely affected by soil erosion due to population growth, changes in land use and land cover, and unsustainable agricultural practices. Issues related to land degradation cost the Kenyan government approximately $390 million or 3 percent of the country’s GDP yearly (Government of Kenya, 2013). Despite extensive land degradation, many attempts to encourage the use of soil and water conservation (SWC) practices have been unsuccessful. The study focuses on Merigi Ward, Kenya. Merigi Ward lies within the Mara River Basin (MRB), an ecologically and economically important river basin that has experienced extensive erosion problems. Increased agricultural activities driven by population growth in the area and changes in land use and land cover have degraded the landscape. SWC practices are greatly needed to mitigate the effects of erosion and conserve the natural resources within the MRB. Past studies suggest that social capital may increase the adoption of SWC practices (Knowler & Bradshaw, 2007; Nyangena, 2008). This study defines social capital as the groups and networks, trust and reciprocity, formal and informal rules, and information that informs the interactions among persons that lead to collective action. Twenty-five smallholder farmers within Merigi Ward were interviewed and the relationship between the adoption of SWC practices and social capital was explored through a qualitative analysis. Additionally, the MRB is home to the Mau Mara Serengeti Sustainable Water Initiative (MaMaSe). The MaMaSe initiative is a public private partnership (P3) with the goal to promote sustainable water use, economic growth, and environmental conservation within the basin. The effect the MaMaSe initiative had on the level of social capital amongst the study participants was also investigated. Findings suggest that social capital is an important aspect of SWC adoption in Merigi Ward. Groups and networks provide farmers with implementation support and information. Particularly, the local farmers’ cooperative provides farmers with implementation assistance and links (bridging capital) to experts at the MaMaSe initiative and the Ministry of Agriculture. Strong bonding capital works in the favor of this community allowing for high levels of trust. Thus, farmers collaborate to help one another implement practices and exchange information, materials, and experiences. In general, social capital has helped facilitate better environmental conservation awareness and the use of SWC practices. The largest impact the MaMaSe initiative had on the community’s social capital was expanding networks (particularly bridging and linking capital) and providing in depth information and guidelines for SWC practice use. The P3 has also helped the farmers integrate environmental conservation into their daily lives and has helped promote a shared understanding of the importance of conservation. The findings of this study will help environmental conservation professionals understand how to use social capital to strengthen natural resource management.

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Libros sobre el tema "Mary River"

Pocock, Mary. Mary Pocock: River of clouds. Toronto: Contor Industries, 2000.

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Morrison, Alice Marie. Descendants of John & Mary Morrison of Rocky River. Harrisburg, NC: Morrison Family Genealogy, 1996.

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Woodroffe, C. D. Geomorphology of the Lower Mary River plains: Northern Territory. North Australia Research Unit, Australian National University: Darwin, 1993.

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Wylie, F. R. Decline of Casuarina and Eucalyptus in the Mary River catchment. [Brisbane]: Dept. of Primary Industries, Forest Service, 1993.

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McCarthy, Martha. From the great river to the ends of the earth: Oblate missions to the Dene, 1847-1921. Alberta: Univ. of Alberta Press, 1995.

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Mark, Harvey. A grammar of Limilngan: A language of the Mary River region, Northern Territory, Australia. Canberra: Pacific Linguistics, Research School of Pacific and Asian Studies, Australian National Library, 2001.

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Gilpin, John F. Quenching the Prairie thirst: A history of the Magrath Irrigation District, Raymond Irrigation District, Taber Irrigation District, St. Mary River Irrigation District. Lethbridge, Alta: St. Mary's Irrigation District, 2000.

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Your will be done: A biography of Sister Mary Samuel Coughlin. Dubuque, Iowa: Kendall/Hunt Pub. Co., 1995.

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1939-, Ward Maurine Carr, ed. Winter quarters: The 1846-1848 life writings of Mary Haskin Parker Richards. Logan, Utah: Utah State University Press, 1996.

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Huberman, S. Procedural guide for international gauging stations on boundary waters between Canada and the United States of America. Ottawa: Dept. of the Environment, Inland Waters Directorate, Water Resources Branch, 1985.

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Capítulos de libros sobre el tema "Mary River"

Applegate, R. J. "Saltwater Intrusion and the Mary River Wetlands of the Northern Territory." In An International Perspective on Wetland Rehabilitation, 113–19. Dordrecht: Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-011-4683-8_11.

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Williams, David. "Recent, Rapid Evolution of the Lower Mary River Estuary and Flood Plains." In Estuaries of the World, 277–87. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-7019-5_16.

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Dietrich, William E., Marisa C. Palucis, Rebecca M. E. Williams, Kevin W. Lewis, Frances Rivera-Hernandez, and Dawn Y. Sumner. "Fluvial Gravels on Mars." In Gravel-Bed Rivers, 755–83. Chichester, UK: John Wiley & Sons, Ltd, 2017. http://dx.doi.org/10.1002/9781118971437.ch28.

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Bucher, Enrique H. "Dulce River Wetland." In The Mar Chiquita Salt Lake (Córdoba, Argentina), 97–109. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-15812-5_10.

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Singh, Vipul. "Where Many Rivers Meet: River Morphology and Transformation of Pre-modern River Economy in Mid-Ganga Basin, India." In Environmental History in the Making, 187–206. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-41085-2_11.

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Simon, Hermann. "Western Journeys: From Charles River to Silicon Valley." In Many Worlds, One Life, 83–109. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-60758-6_6.

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Irwin, Rossman P., Alan D. Howard, and Robert A. Craddock. "Fluvial Valley Networks on Mars." In River Confluences, Tributaries and the Fluvial Network, 419–51. Chichester, UK: John Wiley & Sons, Ltd, 2008. http://dx.doi.org/10.1002/9780470760383.ch19.

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Hoffman, Christina, Assefa M. Melesse, and Michael E. McClain. "Geospatial Mapping and Analysis of Water Availability, Demand, and Use Within the Mara River Basin." In Nile River Basin, 359–82. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-0689-7_18.

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Mango, Liya M., Assefa M. Melesse, Michael E. McClain, Daniel Gann, and Shimelis G. Setegn. "Hydro-Meteorology and Water Budget of the Mara River Basin Under Land Use Change Scenarios." In Nile River Basin, 39–68. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-0689-7_2.

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Bhat, Mahadev G., Michael McClain, Doris Ombara, William Kasanga, and George Atisa. "Payment for Watershed Services in the Mara River Basin: Part I: Institutions and Stakeholder Engagement." In Nile River Basin, 639–65. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-02720-3_31.

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Actas de conferencias sobre el tema "Mary River"

Doré, Guy. "Experimentation of Gravimetric Measurements to Detect the Presence of Buried Ice along the Mary River Railway Corridor." In 14th Conference on Cold Regions Engineering. Reston, VA: American Society of Civil Engineers, 2009. http://dx.doi.org/10.1061/41072(359)32.

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Sánchez, Marcos, Simon Roberts, and Robert Ryan. "Mary Elmes, Design and Construction of an urban pedestrian bridge over river Lee in Cork City Centre. From competition to opening." In Footbridge 2022 (Madrid): Creating Experience. Madrid, Spain: Asociación Española de Ingeniería Estructural, 2022. http://dx.doi.org/10.24904/footbridge2022.013.

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Mary Elmes Bridge is a 66m single span Pedestrian and Cyclist bridge opening in Cork, Ireland in July 2019. In September 2016, Cork City Council launched a competition for a single span – no supports in the river were allowed- pedestrian crossing over the River Lee between the historic bridges of St. Patrick’s (a stone arch form 1860’s) and Brian Boru (a former rolling bascule from 1920). The competition was launched as part of Cork City Councils key objective to encourage greater sustainable travel in the form of walking and cycling within the city Centre.Constrained by heavy trafficked quay roads, the design of a single span 66m crossing was a real challenge when taking into account that the flooding level for the 200years return is 400mm higher than the existing footpaths. The winning solution is a slender, steel shallow through beam with a slight arching effect. The main span is fully integral with the abutments with the central steel box girder and variable width cantilevered walkways joining at both landing points to a stiff concrete piled foundations. The concept adopts a clever strategy to integrate at grade landings with existing footpath levels while making the structure compatible with future city flood defenses. The use of the pedestrian walkway as a flange in the longitudinal direction allows the structure to achieve a significant slenderness.This proposal establishes a connective dialogue with its surrounds and compliant with challenging flooding and visual requirements.

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Wadsworth, William T. D., Gabriel Yanicki, Kisha Supernant, and Christopher N. Jass. "Paraglacial topography of the palaeo-St. Mary River: Preliminary results from the Wally’s Beach archaeological site in southern Alberta, Canada." In 18th International Conference on Ground Penetrating Radar, Golden, Colorado, 14–19 June 2020. Society of Exploration Geophysicists, 2020. http://dx.doi.org/10.1190/gpr2020-011.1.

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"Modelling river constituent budgets in the Burnett Mary region, Queensland, Australia: an example of how it could be used in prioritising management actions." In 20th International Congress on Modelling and Simulation (MODSIM2013). Modelling and Simulation Society of Australia and New Zealand (MSSANZ), Inc., 2013. http://dx.doi.org/10.36334/modsim.2013.l22.fentie.

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Yu, Dongliang, Ji Wang, Quan Cao, Xinglong Zhang, and Xueguang Liu. "Numerical Simulation of Crude Oil Spreading in a Complex River Channel." In 2020 13th International Pipeline Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/ipc2020-9565.

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Abstract Crude oil leaking in rivers may cause serious damages, such as environmental pollution and death of river animals. The crude oil spreading in rivers could be much faster than that on lands, as the leaking crude oil may flow rapidly downstream with the flowing water. Therefore, accurately estimating the transient crude oil spreading area in rivers is a vital task for emergency response and disaster rescue. However, the estimating methods in the literature mainly refer to spreading process in underwater, ocean and soil, which commonly happened in the history. The crude oil transportation pipelines in China pass through many rivers with very complex channel geometries, introducing the necessity of estimating of leaking crude oil spreading in actual river channels. In the current study, the crude oil spreading process along an actual river channel is numerically simulated. The river channel geometry is extracted from a map database, which is further treated using image binarization and edge extraction to obtain the discrete river channel data. The river channel data is then smoothed by picking less data representing main geometric characteristics. The smoothed data is used to reconstruct the river geometry and generate calculation mesh. The mesh is a two-dimensional structured grid with several possible leaking points along the actual crude oil transportation pipeline passing through the river. A multi-fluid MIXTURE model is used to simulate the crude oil spreading process on the water surface, meaning crude oil blending in the flowing water. Cases with a leaking mass flow rate of 240 kg/s and a river flow velocity of 1.58 m/s are simulated for 10 possible leaking sources on the traversing pipeline. The effect of leaking locations and river channel bending on crude oil spreading on river surface were significant according to the simulation results. Sudden widening river channel may result in vortexes and slightly delays the crude oil spreading. The simulated data could be used to make the rescue strategy of crude oil leaking in this specific river.

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Galloway, Gerald. "Mark Twain, the Mississippi, and modern river engineering." In The International Conference On Fluvial Hydraulics (River Flow 2016). Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742: CRC Press, 2016. http://dx.doi.org/10.1201/9781315644479-3.

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Braduliene, Jolita, and Raimondas Grubliauskas. "Nitrogen Compunds in the Surface Water Identifying Concentrations and Sources." In Environmental Engineering. VGTU Technika, 2017. http://dx.doi.org/10.3846/enviro.2017.011.

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The main objective of the surface water monitoring – periodically to conduct water quality testing, to find out the possible sources of pollution in time and to warn population. Water samples for analysis of surface water bodies – rivers Raseika (Raseiniai district, central Lithuania) were taken during the autumn season. The river Raseika belongs to the basin of the river Jura. This river was drained for many times and has a lot of ponds. The treated urban sewage of Raseiniai wastewater treatment plants flows to this river. Also the river Raseika is polluted by population sewage, which are not col-lected and treated. The river Raseika flows through Dubysa Regional Park area, which was established in 1992 to preserve Dubysa erosive valley landscape, natural and cultural heritage values: the picturesque Dubysa valley; significant geomor-phological, hydrographic, cultural, botanical and landscape values, natural ecosystem stability, biota components, unique flora and fauna, natural fish migration routes and spawning grounds. Six points were selected to carry out the monitoring of the river Raseika. The nitrogen concentrations were mostly not corre-sponding to the standards. Most of the ascendances were found in samples where the treated urban sewage of Raseiniai city wastewater treatment plants flows in the river.

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Long, Dejiang, Michael J. Bender, Les F. Sawatsky, Paul Anderson, and Serge Metikosh. "Sediment Entrainment During Construction of River Pipeline Crossings: Occurrence, Prediction and Control." In 1998 2nd International Pipeline Conference. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/ipc1998-2125.

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Sediment entrainment in rivers caused by pipeline watercourse crossing construction may represent a constraint on pipeline route selection and construction methods as designers attempt to develop a sediment and erosion control plan which meets regulatory approval without risk of costly delays. To avoid the risk of significant sediment entrainment, conventional open-cut crossing techniques may be replaced by more costly directional drilling methods. However, the concern over suspended sediment is greatest in high velocity rivers where the bed material includes a large fraction of fine sand, and in rivers with a large fraction of fine grained bed material which becomes suspended upon disturbance by construction activities. According to the current understanding of aquatic impacts due to elevated suspended sediment levels, the occurrence of suspended sediment may not be excessive at open-cut excavation in certain types of streams depending on the material consistency, fine sand content and river flow velocity (Anderson et al, 1996). Control of sand entrainment can normally be achieved by low cost sediment control systems during construction. Methods of prediction, impact assessment, and control of sediment entrainment have been developed so that high risk crossings can be identified and impacts minimized. The application of the study findings and best management practices (BMPs) for sediment control will allow developers to choose the most appropriate crossing method while avoiding potentially adverse impacts, based on a sound understanding of river sediment transport, bed material conditions and downstream aquatic resources.

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Esakkimuthu, T., Marykutty Abraham, and S. Akila. "Application of Artificial Neural Network to Predict TDS Concentrations of the River Thamirabarani, India." In Intelligent Computing and Technologies Conference. AIJR Publisher, 2021. http://dx.doi.org/10.21467/proceedings.115.6.

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River water quality modeling is of prime importance in predicting the health of the rivers and in turn warns the human society about the future possibility of water problem in that area. Total dissolved solids is a prominent parameter used to access the quality of the river water. In our current study, artificial neural networking models have been developed to predict the concentrations of total dissolved solids of the river Thamirabarani in India. Neural Network toolbox of the MATLAB 2017 application was used to create and train the models. Monthly data from year 2016 to 2019 at four different sites near Thamirabarani river were procured from Tamilnadu pollution control board. Many artificial neural network architectures were built and the best performing architecture was selected for this study. With several parameters such as pH, chloride, turbidity, hardness, dissolved oxygen as input and the total dissolved solids as output parameter, the model was trained for many iterations and a final architecture was arrived which predicts the futuristic TDS concentrations of Thamirabarani in a more accurate manner. The predicted and the expected values were very close to each other. The root mean square error (RMSE) values for the selected stations such as Papanasam, Cheranmahadevi, Tirunelveli and Punnaikayal were 0.565, 0.591, 0.648 and 0.67 respectively.

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Zinke, P., J. Aberle, and F. Nedelcut. "Vegetation changes at “Fundu Mare Island” in the Inner Danube Delta near Brăila (Romania)." In The International Conference On Fluvial Hydraulics (River Flow 2016). Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742: CRC Press, 2016. http://dx.doi.org/10.1201/9781315644479-338.

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Informes sobre el tema "Mary River"

Hamblin, A. P. Edmonton Group/St. Mary River Formation: summary of literature and concepts. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1998. http://dx.doi.org/10.4095/209584.

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Saumur, B. M., D R Skipton, M. R. St-Onge, G. D. Jackson, N. Wodicka, E. R. Bros, O. M. Weller, and S T Johnston. Bedrock geology, Angijurjuk-Mary River, Baffin Island, Nunavut, NTS 37-G west. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2020. http://dx.doi.org/10.4095/321794.

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Hamblin, A. P. Detailed outcrop measured section of the St. Mary River Formation, Oldman River, west of Monarch, southern Alberta. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1998. http://dx.doi.org/10.4095/209905.

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Kung, R., D. A. Brown, C. Lowe, and A. Rencz. Geology and Landsat imagery of the St. Mary River area - west, southeastern British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1997. http://dx.doi.org/10.4095/208686.

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Kung, R., D. A. Brown, C. Lowe, and A. Rencz. Geology and Landsat imagery of the St. Mary River area - east, southeastern British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1997. http://dx.doi.org/10.4095/208687.

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Johns, S. M., and M. D. Young. Bedrock geology and economic potential of the Archean Mary River group, northern Baffin Island, Nunavut. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2006. http://dx.doi.org/10.4095/222954.

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Hamblin, A. P. Detailed outcrop measured sections of the St. Mary River/Horseshoe Canyon formations, Little Bow River and Travers Reservoir, near Carmangay, southern Alberta. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1998. http://dx.doi.org/10.4095/209406.

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Young, M. D., H. Sandeman, F. Berniolles, and P. M. Gertzbein. A preliminary stratigraphic and structural geology framework for the Archean Mary River Group, northern Baffin Island, Nunavut. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2004. http://dx.doi.org/10.4095/215376.

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Scott, D. J., M. R. St-Onge, and D. Corrigan. Geology of the Archean Rae Craton and Mary River Group and the Paleoproterozoic Piling Group, central Baffin Island, Nunavut. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2003. http://dx.doi.org/10.4095/214208.

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Hamblin, A. P. Detailed outcrop measured sections of the St. Mary River and Willow Creek Formations in the foothills of southern Alberta. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2010. http://dx.doi.org/10.4095/263393.

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