Bibliografie tematiche / Sand dunes South Australia

Indice

  1. Articoli di riviste
  2. Tesi
  3. Libri
  4. Capitoli di libri
  5. Atti di convegni
  6. Rapporti di organizzazioni

Letteratura scientifica selezionata sul tema "Sand dunes South Australia"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 1 febbraio 2022

Cita una fonte nei formati APA, MLA, Chicago, Harvard e in molti altri stili

Scegli il tipo di fonte:

Consulta la lista di attuali articoli, libri, tesi, atti di convegni e altre fonti scientifiche attinenti al tema "Sand dunes South Australia".

Accanto a ogni fonte nell'elenco di riferimenti c'è un pulsante "Aggiungi alla bibliografia". Premilo e genereremo automaticamente la citazione bibliografica dell'opera scelta nello stile citazionale di cui hai bisogno: APA, MLA, Harvard, Chicago, Vancouver ecc.

Puoi anche scaricare il testo completo della pubblicazione scientifica nel formato .pdf e leggere online l'abstract (il sommario) dell'opera se è presente nei metadati.

Articoli di riviste sul tema "Sand dunes South Australia"

1

Moseby, K. E., R. Brandle e M. Adams. "Distribution, habitat and conservation status of the rare dusky hopping-mouse, Notomys fuscus (Rodentia : Muridae)". Wildlife Research 26, n. 4 (1999): 479. http://dx.doi.org/10.1071/wr97061.

Testo completo
Abstract (sommario):
The distribution, habitat and conservation status of Notomys fuscus were determined by collating past records of the species and conducting field investigations covering areas of historical distribution and similar habitats. Detailed population sampling was carried out in two geographically distinct locations where populations appeared to be extant. Evidence of N. fuscus was found throughout the Strzelecki Desert east and south of the Strzelecki Creek in South Australia and in an isolated group of dunes south-east of the Diamantina River in south-west Queensland. Populations were located in a variety of sand dune habitats (excepting those dominated by Triodia) throughout these areas, implying that the species is a habitat-generalist with a preference for a sandy substrate. Eight floristic groups were identified from the 66 sites sampled, three of which supported N. fuscus populations. These ranged from extremely degraded dune and sand plain systems in the southern Strzelecki Desert, supporting mostly ephemeral plants, to well-vegetated dunes covered by sandhill canegrass,Zygochloa paradoxa, in south-west Queensland. However, the results suggest that the presence of consolidated dunes and perennial vegetation are important for the maintenance of stable populations. Relatively dense populations of N. fuscus were recorded only in the vicinity of major drainage systems. It is hypothesised that the higher nutrient status of the soils surrounding such systems may be an important factor affecting the distribution of N. fuscus. The study reaffirmed the species’ decline since European settlement of Australia, and recommends that the present vulnerable status of the species (IUCN Species Survival Commission (SSC) Rodent Specialist Group) be maintained.
Gli stili APA, Harvard, Vancouver, ISO e altri
2

Liu, Zhengyao, Zhibao Dong e Xujia Cui. "Morphometry of lunette dunes in the Tirari Desert, South Australia". Open Geosciences 10, n. 1 (14 settembre 2018): 452–60. http://dx.doi.org/10.1515/geo-2018-0035.

Testo completo
Abstract (sommario):
Abstract Morphometry and formation processes are key research problems in the study of aeolian sandy landforms. Based on morphometric parameters inferred from satellite images and the calculation of the drift potential (DP), we examined general characteristics of lunette dunes in the Tirari Desert, South Australia, along with their morphometry and formation processes to determine how this landform type initially formed and its relationship to surrounding linear dune distribution. Results show that the morphometric parameters of lunette dunes and connective lake systems exhibit moderate correlations. It suggests that the morphology of these dunes is controlled by the lakes. Spatially, the lunette dunes present regular arrangement, and the strike of their alignment are approximately in accordance with the linear dunes. The calculated DP implies that the lunette dunes developed under a low-wind-energy environment, which is a wind regime similar to that required for the formation of the surrounding linear dunes. Even though, the resultant DP demonstrates that the summer wind should be responsible for the growth of the lunette dunes. However, accompanied with the repeated drying of lakes and even its disappearance during the dune development process, it not only contributes to the development of lunette dunes but also promotes their transformation to linear dunes.
Gli stili APA, Harvard, Vancouver, ISO e altri
3

Ellerton, Daniel, Tammy Rittenour, Graziela Miot da Silva, Allen Gontz, James Shulmeister, Patrick Hesp, Talitha C. Santini e Kevin J. Welsh. "Late-Holocene cliff-top blowout activation and evolution in the Cooloola Sand Mass, south-east Queensland, Australia". Holocene 28, n. 11 (6 agosto 2018): 1697–711. http://dx.doi.org/10.1177/0959683618788679.

Testo completo
Abstract (sommario):
Cliff-top dunes are a locally important geomorphic features of sedimentary coasts. They are traditionally interpreted as being sourced by (or with) sand derived from the beach below the cliff. This paper presents the results of a stratigraphic and geochronological study of Carlo Sand Blow, a coastal blowout that has developed on top of a high sandy cliff in the Cooloola Sand Mass, south-east Queensland. We use a combination of sedimentological, pedological and geophysical techniques along with optically stimulated luminescence dating to determine the depositional history and evolution of the blowout. We demonstrate that the blowout is dominantly nourished by sand eroded from its floor rather than the adjacent beach. The original dune surface dates to the first half of the last glacial period (c. 40–70 ka) and this dune was deflated in the late-Holocene. Dune activity is directly associated with cliff undercutting because of coastal retreat in the late-Holocene, but coastal erosion on its own is not capable of maintaining aeolian activity. Blowout activity occurred between 2.6 and 2.3 ka and again at 0.3 ka with aeolian sand burying palaeosols. Both soil surfaces contained charcoal and tree stumps in growth position and our study suggests that fire is the immediate trigger for blowout reactivation. It is likely that these fires were anthropogenic in origin, because the site is somewhat protected from natural fire and the ages coincide with intensification of human use of coastal sites in the area.
Gli stili APA, Harvard, Vancouver, ISO e altri
4

Urushibara-Yoshino, K. "The soils on the calcareous sand dunes southeast of South Australia". Environmental Geology 28, n. 3 (23 ottobre 1996): 154–60. http://dx.doi.org/10.1007/s002540050088.

Testo completo
Gli stili APA, Harvard, Vancouver, ISO e altri
5

Ryan, Adrienne L., e Stephen R. Cattle. "Do sand dunes of the lower Lachlan floodplain contain the same dust that produced parna?" Soil Research 44, n. 8 (2006): 769. http://dx.doi.org/10.1071/sr06051.

Testo completo
Abstract (sommario):
Æolian dust deposits are known to be widespread in south-eastern Australia, with the dominant model being that of ‘parna’, an aggregated material comprising clay, calcium carbonate, and silt-sized quartz. Despite a general acceptance of the parna model, there is surprisingly little evidence of silt-sized clay aggregates remaining in parna profiles. To investigate a relatively pure æolian dust deposit within the proposed zone of parna distribution, we examined the various phases of 3 source-bordering sand dunes on the lower Lachlan River floodplain of south-western NSW. In each dune exists an upper-slope phase of coarse brown sand, a mid-slope layer of reddish, clay-enriched sand, and a lower-slope phase of coarse sand dominated by an accumulation of carbonate glaebules. Granulometric analyses of the clay-enriched phase(s) of each dune identified a conspicuous particle population in the 20–60 μm range, and another in the fine-silt/clay range (<10 μm). Mineralogical characterisation revealed an abundance of illite and kaolinite in the upper 2 dune phases, coupled with a minor amount of smectite, further suggesting an allochthonous æolian origin, as the surrounding floodplain is smectite-rich and relatively poor in illite. Micromorphological features within the clay-enriched phase, including abundant argillans and laminar bands of well-sorted fine quartz grains, indicate that this clay is a depositional feature, illuviated from surface horizons and re-deposited at depth. A similar illuvial origin is suggested by the fine crystalline nature of the calcium carbonate accumulation, ubiquitously coating the matrix mineral grains of the lower dune phase. No discrete clay aggregates were identified; however, all the assumed components of parna (silt-sized quartz grains, clay, and calcium carbonate) were identified, spatially separated within each dune. The consistency of these features among the 3 dunes indicates an analogous æolian dust accession, but it is not clear whether the clay component of this dust was transported as coatings on quartz grains, or as silt-sized clay aggregates accompanied by silt-sized quartz grains.
Gli stili APA, Harvard, Vancouver, ISO e altri
6

Val, J., T. Mazzer e D. Shelly. "A new record of the dusky hopping mouse (Notomys fuscus) in New South Wales". Australian Mammalogy 34, n. 2 (2012): 257. http://dx.doi.org/10.1071/am11031.

Testo completo
Abstract (sommario):
The dusky hopping mouse, Notomys fuscus, is a desert rodent that occurs in the Simpson Strzelecki Dunefield Bioregion in Queensland, South Australia and New South Wales, where stabilised sand dunes are its preferred habitat. A recent capture from the Broken Hill Complex Bioregion in an atypical habitat (bluebush shrubland) and new locality ~170 km south of the nearest New South Wales record may indicate a significant population eruption and subsequent migration into new areas following the widespread ephemeral and perennial plant production pulse that occurred in 2010.
Gli stili APA, Harvard, Vancouver, ISO e altri
7

Matthews, E. G. "Origins of Australian arid-zone tenebrionid beetles". Invertebrate Systematics 14, n. 6 (2000): 941. http://dx.doi.org/10.1071/it00021.

Testo completo
Abstract (sommario):
Three biogeographic components with very different histories are represented among the tenebrionids of the Australian arid zone: the Indo-Malayan element, which is related mainly to the Indonesian fauna; the Austral Gondwanan element, mainly related to that of southern South America; and one here called Tethyan, related to the fauna of northern hemisphere arid regions. Indo-Malayan groups appear to have arrived comparatively recently, probably by invasion from the north, and are differentiated within the arid zone mainly to the species level. Austral groups are the most diverse and have radiated extensively to generic level from ancestors inhabiting sclerophyll forest, probably by vicariance, within the present arid zone. Tethyan groups are endemic in the arid zone at tribal level and have no forest-inhabiting relatives anywhere. They have often become myrmecophilous in Australia, and because of their distribution patterns in the northern hemisphere, partial occurrence in coastal dunes, and apparently basal phylogenetic positions are surmised to have descended by vicariance from inhabitants of the coastal sand dunes of the Tethys Sea, probably in the Jurassic before there was an arid zone in Australia.
Gli stili APA, Harvard, Vancouver, ISO e altri
8

Huntley, D. J., J. T. Hutton e J. R. Prescott. "South Australian sand dunes: A TL sediment test sequence: Preliminary results". Nuclear Tracks and Radiation Measurements (1982) 10, n. 4-6 (gennaio 1985): 757–58. http://dx.doi.org/10.1016/0735-245x(85)90086-9.

Testo completo
Gli stili APA, Harvard, Vancouver, ISO e altri
9

Smith, Cathy. "Tin City: Nomadic occupation, colonization and resistance in the sand dunes of Stockton Bight, Australia". Design Ecologies 9, n. 1 (1 giugno 2020): 93–109. http://dx.doi.org/10.1386/des_00006_1.

Testo completo
Abstract (sommario):
This article explores nomadic site occupation as a form of planetary colonization involving both human and non-human agents. Conventional understandings of temporary occupation are often humancentric with little attention paid to the disruption of extant site ecologies and processes. The latter are particularly pressing concerns in nomadic settlements located in precarious landscapes. Taking the latter as its focus, this article engages the earth as an agent resisting its own colonization in the Australian-licensed squatter settlement known colloquially as Tin City. Located within the largest mobile sand dune structure in New South Wales, Tin City is an assemblage of several self-built fishing shacks accommodating a nomadic population. Its occupants engage in a daily battle against the shifting sands that threaten to subsume their temporary homes. Located in an area of significant indigenous heritage, the Tin City settlement has become a tourist attraction shrouded in local lore. Current discourses about it and its architectures generally focus on its unusual aesthetics, its contested sociopolitical histories and its ecology, with some discussion on the impacts of European colonization on the sand dune’s dynamic geomorphology. To concentrate on the latter, the article develops and deploys the posthumanist conceptualization of the earth posited by Iranian philosopher Reza Negarestani in his ficto-critical text Cyclonopedia: Complicity with Anonymous Materials. Negarestani ascribes the earth with sentient and agentic capacity, whilst the nomads who traverse its surfaces become the penultimate planetary colonizers. Tin City’s occupation thus becomes a story of colonization and resistance narrated by the earth itself, and a reminder that the production and consumption of architectural forms does not need to be confined to that which is conventionally human.
Gli stili APA, Harvard, Vancouver, ISO e altri
10

Maze, KM, e RDB Whalley. "Sex-Ratios and Related Characteristics in Spinifex sericeus (Poaceae)". Australian Journal of Botany 38, n. 2 (1990): 153. http://dx.doi.org/10.1071/bt9900153.

Testo completo
Abstract (sommario):
Spinifex sericeus R.Br. is a dioecious, stoloniferous grass which occurs on sand dunes around much of the south-eastern coastline of Australia, New Zealand and New Caledonia. Sex ratios of ramets of S. sericeus and some associated characteristics were studied on the mid-north coast of New South Wales. Generally there was a male bias in the observed ramet sex ratio, although the extent of this bias varied with the beach investigated, the position in the dunes and the time of sampling. Male inflorescences matured and died more rapidly than females, and hence the observed male bias was greatest at the beginning of the flowering period. Male ramets were found to have more sexual tillers per clump than female ramets. The genet sex ratio was estimated from plants grown from seed and separated from each other throughout the experimental period. Males and females were found to be equal in number, although this equality may not be a true reflection of the genet sex ratio in the field.
Gli stili APA, Harvard, Vancouver, ISO e altri
Più fonti

Tesi sul tema "Sand dunes South Australia"

1

Peter, Craig Ingram. "Water requirements and distribution of Ammophila arenaria and Scaevola plumieri on South African coastal dunes". Thesis, Rhodes University, 2000. http://eprints.ru.ac.za/38/.

Testo completo
Gli stili APA, Harvard, Vancouver, ISO e altri
2

Davey, Stephen. "Environmental governance of sand mining in an urban setting : Macassar Dunes, Cape Town, South Africa". Master's thesis, University of Cape Town, 2001. http://hdl.handle.net/11427/4842.

Testo completo
Abstract (sommario):
Includes bibliographical references.
Sand is a resource in high demand for urban expansion and development. Sand mining operations are often located on the edges of cities. The Macassar Dunes are an important source of building sand for the City of Cape Town. The area is located within the Cape Floral Kingdom, the smallest and richest of the six floral kingdoms of the world. The Macassar Dunes area has been identified as a core flora conservation site due to its unique habitat diversity and quality. South Africa is a developing country and this case study is used to highlight the tensions that arise between the need to provide building sand for development and the need for integrated and accountable management that allows for the sustainable functioning of natural physical and ecological processes as well as enhanced social and economic benefits for people.
Gli stili APA, Harvard, Vancouver, ISO e altri
3

Barwell, Lauriston. "Integrity assessment procedure for buffer dune systems on the Cape South Coast, South Africa". Thesis, Stellenbosch : University of Stellenbosch, 2011. http://hdl.handle.net/10019.1/6524.

Testo completo
Abstract (sommario):
Thesis (MScEng (Civil Engineering))--University of Stellenbosch, 2011.
ENGLISH ABSTRACT: The hypothesis postulated in this research, namely that the effectiveness of natural and constructed buffer dune systems can be assessed by a set of indicators that defines the integrity of the dune system and triggers informed management decisions, was evaluated and proved to be essentially true. Two key objectives, namely (1) the identification of key indicators that define the buffer dune integrity; and (2) the development of a scientifically defendable and practical checklist-based method of gathering qualitative information on the identified key indicators so as to guide decision-making at municipal level formed the core of the study. The six dune integrity indicators that collectively define the risk profile of a particular site along the Southern Cape coastline are (1) the degree of protection from prevailing wave energy, (2) the characteristics of the dominant winds and sand supply during the dry season, (3) the relative height of the foredune, (4) the degree of pressure on the buffer dune due to humans, (5) the vulnerability of the type of coastline to erosion, and (6) the coastline stability considering the prevailing coastal processes. The first two indicators relate to the natural (permanent) characteristics of the site and can be defined by experts and presented in the form of a risk and vulnerability atlas layer for direct use by non-experts. The third and fourth indicators relate directly to the implementation of proactive assessment and appropriate management actions to ensure a high level of buffer dune integrity. The last two indicators allow for management intervention to reduce the vulnerability but may entail costly engineering solutions and require expert input. A conceptual risk profile assessment procedure and a decision support guideline incorporating these indicators were developed and evaluated for relevance and practicality through a series of workshops with municipal officials along the south coast of South Africa. It was seen that although some initial basic training may be required, carrying out rapid assessments of the environmental status of key components of an identified human–nature system, such as a buffer dune, is practical and achievable by non-experts.
AFRIKAANSE OPSOMMING: Die hipotese wat in hierdie navorsing gepostuleer is, naamlik dat die doeltreffendheid van natuurlike en geboude bufferduinstelsels geassesseer kan word deur ’n stel aanwysers wat die integriteit van die duinstelsel bepaal en ingeligte bestuursbesluite tot gevolg het, is getoets en bewys hoofsaaklik waar te wees. Twee sleuteldoelwitte, naamlik (1) die identifisering van sleutelaanwysers wat die bufferduinintegriteit bepaal; en (2) die ontwikkeling van ’n praktiese kontrolelys-gebaseerde metode wat wetenskaplik verdedigbaar is om kwalitatiewe inligting oor die geïdentifiseerde sleutelaanwysers in te samel ten einde besluitneming op munisipale vlak te bevorder, vorm die kern van die studie. Die ses duin-integriteitsaanwysers wat gesamentlik die risikoprofiel van ’n bepaalde terrein langs die kuslyn bepaal, is (1) die graad van beskerming teen die heersende golfenergie, (2) die kenmerke van die dominante winde en sandbron gedurende die droë seisoen, (3) die relatiewe hoogte van die voorduin, (4) die graad van druk op die bufferduin as gevolg van mense, (5) die eroderingskwesbaarheid van die soort kuslyn, en (6) die kuslynstabiliteit met inagname van die kusprosesse. Die eerste twee aanwysers het betrekking op die natuurlike (permanente) eienskappe van die terrein en kan deur kundiges bepaal word en in die vorm van ’n kaart in ’n risiko-enkwesbaarheidsatlas aangebied word vir direkte gebruik deur niedeskundiges. Aanwysers 3 en 4 hou direk verband met die implementering van tydige en deurlopende proaktiewe assessering en gepaste bestuursaksies om ’n hoë vlak van bufferduinintegriteit te verseker. Aanwysers 5 en 6 bevorder bestuursaksies om kwesbaarheid te verminder, maar kan moontlik duur ingenieursoplossings inhou en kundige insette benodig. ’n Konseptuele risikoprofielassesseringsprosedure en ’n besluitondersteuningsriglyn wat die aanwysers insluit, is ontwikkel en geëvalueer vir toepaslikheid en uitvoerbaarheid deur ’n reeks werkswinkels met munisipale amptenare aan die suidkus van Suid-Afrika. Hoewel aanvanklike basiese opleiding nodig kan wees, bly dit dat vinnige assessering van die omgewingstatus van sleutelkomponente van ’n geïdentifiseerde mens–natuurstelsel, soos ‘n bufferduin, prakties en haalbaar deur niedeskundiges is.
Gli stili APA, Harvard, Vancouver, ISO e altri
4

Bishop, Mark A. "The spatial and temporal geomorphology and surficial sedimentology of the Gurra Gurra crescentic dunes, Strzelecki Desert, South Australia /". Title page, contents and abstract only, 1997. http://web4.library.adelaide.edu.au/theses/09PH/09phb6223.pdf.

Testo completo
Gli stili APA, Harvard, Vancouver, ISO e altri
5

Avis, Anthony Mark. "Coastal dune ecology and management in the Eastern Cape". Thesis, Rhodes University, 1993. http://hdl.handle.net/10962/d1003753.

Testo completo
Abstract (sommario):
The importance of understanding the ecological functioning of coastal dune systems is emphasized as being fundamental to the correct management of the dune landscape. Dune vegetation along the Eastern Cape coastline, from Cape St Francis in the west to Kei Mouth in the east was described in terms of the distribution and phytochorological affinities of the taxa. At a regional scale species distribution was strongly influenced by both the climate, particularly rainfall, and the phytochorological affinities of the taxa. Seven communities were defined using TWINSPAN, and the interrelationships between these communities in anyone area appeared to be linked to a successional gradient. Dune Slacks are thought to play a key role in this successional sequence, and a temporal study of this community led to a conceptual model of plant succession in these dunefields. Climate, particularly rainfall and wind, are major factors influencing plant succession. Wind-borne sand causes the slacks to migrate in an easterly direction under the influence of the predominantly westerly winds, although easterly winds, mainly in summer months may reverse these trends. Autogenic changes appeared to be important in this succession, and a comparative study of a good example of a primary succession at Mtunzini in Natal was undertaken to elucidate the main mechanism of change. Eight communities that were identified here were concluded to be distnbuted along a gradient of increasing age, with successional changes predictable, linear and directional. Species were grouped in distinct zones along the continuum and edaphic changes (decrease in soil pH, increase in organic matter and exchangeable bases) were related to the community based changes in species composition. The mechanism of change supported the facilitation model of plant succession which is a modification of the original Clementsian concept. Similar results were found in the Eastern Cape, but due to the harsh environment, multiple pathways of succession exist. Data from this study lent support to the model of plant succession developed earlier, and confinned that the dune slacks played an important role in this facilitation by acting as centres of diversity. The foredunes were found to have an indirect role in protecting these slacks from salt spray and sand movement. The central theme of the management studies was to investigate the ecological consequences of recreational pressure within the dune environment. Current levels of beach utilization at East London were lower than other beaches in South Africa, but a general trend of increasing utilization due to sociopolitical changes can be expected. The suitability of questionnaire surveys to assess aspects such as the adequacy of facilities, perceptual carrying capacity and the beach users opinion of natural vegetation and preference for particular beaches was demonstrated. The dune vegetation was found to be sensitive to human trampling, but at current levels, the ecological carrying capacity will not be exceeded since results of the aerial census counts and questionnaire survey revealed that few people entered sensitive zones such as the coastal forest. More detailed long term studies on the susceptibility of dune vegetation to both trampling and off-road vehicle impacts revealed a low resilience of dune plant communities to these effects. Although susceptibility differed between the three communities tested, generally the greatest amount of damage occurred after the first few passages, and vehicles caused a more significant decrease in height when compared to trampling. Recovery rates were slow and low levels of repeated damage were sufficient to retard or prevent the recovery of the plants. Stricter control of vehicle use on beaches is therefore required, and in high use zones the ecological carrying capacity should be increased by providing access tracks if possible, or if not possible, by restricting access. A historical account of the process of dune stabilization showed that although first initiated in 1845, indigenous species were only used in the past three decades. The use of alien species has resulted in problems such as a reduction in the ecological integrity and aesthetic appeal of coastal systems. The techniques applied in the stabilization of drift sands with indigenous vegetation have been successful, as revealed by a quantitative survey of 17 sites in the Eastern Cape. Sites were grouped by multivariate analysis on the basis of their species composition, and variability between sites was dependent on the types of species planted. Selection of suitable species is therefore important and is discussed with respect to their natural distribution along the coast. The long term objective of stabilization should be the creation of functional, diverse, aesthetic ecosystems, since the intrinsic and economic value of the dune landscape for tourism lies therein. However, detailed studies should be undertaken prior to implementing a manipulative process such as dune stabilization, since ecological processes may be disrupted. An understanding of such processes is therefore important if one wishes to effectively manage the dune landscape.
Gli stili APA, Harvard, Vancouver, ISO e altri
6

Schulz-Rojahn, J. P. "Origin, evolution and controls of Permian reservoir sand stones in the Southern Cooper Basin, South Australia". Title page, abstract and contents only, 1991. http://web4.library.adelaide.edu.au/theses/09PH/09phs389.pdf.

Testo completo
Abstract (sommario):
Thesis (Ph. D.)--University of Adelaide, National Centre for Petroleum Geology & Geophysics (NCPGG) /Dept. of Geology & Geophysics, 1993.
At head of title: "NERDDC/SENRAC Research Project." Three folded maps in pocket. Two microfiches in pocket. Includes bibliographical references (leaves 155-187).
Gli stili APA, Harvard, Vancouver, ISO e altri
7

Tyson, Susan Jean. "Sand ramps or climbing dunes? : identification and palaeoenvironmental significance of aeolian deposits in the Southern Kalahari and Breede River valley, South Africa". Master's thesis, University of Cape Town, 1999. http://hdl.handle.net/11427/17115.

Testo completo
Abstract (sommario):
Bibliography: pages 120-128.
The study is primarily concerned with the identification of topographical dunes and their classification as either sand ramps or climbing dunes. Topographical dunes in two semi-arid regions, namely the southern Kalahari (a summer rainfall region) and the Breede River Valley (a winter rainfall region), were investigated. The study also evaluates the palaeoenvironmental significance of the topographical dunes and attempts a palaeoenvironmental reconstruction within the study regions. The two different rainfall regimes facilitated regional comparisons with respect to environmental change, most particularly during the Quaternary. The methodology comprises a review of current literature on topographical dunes, an examination of aerial photography to identify topographical dunes in South Africa and field work to ground truth the dunes. Field sampling, laboratory work (granular composition analysis, pH, conductivity and scanning electron microscopy) as well as statistical analyses (principal component and cluster analyses) were employed to assist in the palaeoenvironmental reconstruction. The results of the laboratory and statistical analyses do not reveal any obvious differences with respect to structure, particle size, pH, conductivity, chemical composition and the surface texture of the grains between, the different topographical dunes. The dunes comprise homogeneous quartz sand that was emplaced against topographical barriers as a result of aeolian processes. They are therefore classified as climbing dunes rather than sand ramps. Three optically stimulated luminescence dates were determined for a topographical dune from each study region. Samples from the Prynnsberg 2 dune in the southern Kalahari are dated to 100 years, and it is suggested that this is due to current reworking of the Kalahari sands from the extensive linear dune field and from the Orange River. It is proposed that the southern Kalahari topographical dunes are currently episodically active. From the Sandput dune in the Breede River Valley, three probable humid phases are identified: 762 kyr, 28.2 kyr and 9.9 kyr. These humid periods may be coupled with episodes of cooling, which supports results from previous studies. This finding has important implications for future climatic changes in the winter rainfall region of South Africa, implying that warming in the Western Cape may be associated with a decrease in precipitation. Lastly, a short historic overview of aerial photographs shows that topographical dunes are susceptible to human impacts in the form of agriculture, overgrazing, sand quarrying and through the construction of dams and weirs on rivers.
Gli stili APA, Harvard, Vancouver, ISO e altri
8

Ntshotsho, Phumza. "Carbon sequestration on the subtropical dunes of South Africa a comparison between native regenerating ecosystems and exotic plantations /". Diss., Pretoria : [s.n.], 2006. http://upetd.up.ac.za/thesis/available/etd-06132006-101405.

Testo completo
Gli stili APA, Harvard, Vancouver, ISO e altri
9

Fraser, Claire. "Coastal dune dynamics and management at the Bushman's River mouth, Kenton-on-Sea". Thesis, Rhodes University, 2005. http://hdl.handle.net/10962/d1003761.

Testo completo
Abstract (sommario):
A study of the dynamics and functions of a coastal dunefield at the Bushman’s River Mouth in Kenton-on-Sea was conducted to provide essential information for the formulation of a management strategy based on an ecosystem approach. Bi-monthly tacheometric surveys were undertaken at the Westbourne Road Car Park dunefield to investigate the sedimentological processes. Changes in the topography, the amount and rate of sand accretion were monitored. Accretion and progradation were the dominant long-term sedimentological processes at the site. Long-term spatial variation in these processes corresponded to the temporal pattern of sedimentation in the river mouth while short-term variation resulted from dynamics inherent to the types of dunes present. Factors affecting aeolian accretion at the site are topography, river mouth configuration, dune types and the presence of vegetation as well as the seasonal wind regime. A vegetation study, recording species present, cover and abundance of the plants along the surveyed transects, was also conducted to examine the progressive establishment of vegetation. Five plant communities were discerned namely, saltmarsh, pioneer, enriched pioneer, open scrub, closed scrub and scrub-thicket communities. The spatial distribution of these communities coincided with the north-westerly development of the sandbank. A successional trend in community change occurred along a gradient of increasing diversity, complexity and age. Initially, autogenic changes wrought by pioneer species facilitated the recruitment and survival of other species and commenced succession at the study site. Multiple successional pathways were discussed in relation to subsequent species establishment that occurred after facilitation. The amalgamation of ecological data with a social study in the form of public perception surveys allowed for a greater understanding of the present interactions between the ecosystem and the demands placed on it. The area primarily functions as a recreational site that offered numerous beach and water-related activities. A lack of information regarding the ecology and management programmes influenced public perception of the environment and management issues in general. Different management perspectives and the use of the information presented in this study were also discussed.
Gli stili APA, Harvard, Vancouver, ISO e altri
10

Horton, Jennifer Marie. "The Deglacial Chronology of the Sturgis Moraine in South-Central Michigan and Northeast Indiana". University of Toledo / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1437256297.

Testo completo
Gli stili APA, Harvard, Vancouver, ISO e altri
Più fonti

Libri sul tema "Sand dunes South Australia"

1

Roy, P. S. Marine sand bodies on the South Sydney shelf, S.E. Australia. Sydney, N.S.W: Dept. of Geography, University of Sydney, Australia, 1985.

Cerca il testo completo
Gli stili APA, Harvard, Vancouver, ISO e altri
2

Rupert, Michael. Ground-water age and flow at Great Sand Dunes National Monument, south-central Colorado. [Reston, Va.]: U.S. Dept. of the Interior, U.S. Geological Survey, 2004.

Cerca il testo completo
Gli stili APA, Harvard, Vancouver, ISO e altri
3

Rupert, Michael. Ground-water age and flow at Great Sand Dunes National Monument, south-central Colorado. [Reston, Va.]: U.S. Dept. of the Interior, U.S. Geological Survey, 2004.

Cerca il testo completo
Gli stili APA, Harvard, Vancouver, ISO e altri
4

Rupert, Michael. Ground-water age and flow at Great Sand Dunes National Monument, south-central Colorado. [Reston, Va.]: U.S. Dept. of the Interior, U.S. Geological Survey, 2004.

Cerca il testo completo
Gli stili APA, Harvard, Vancouver, ISO e altri
5

Rupert, Michael. Ground-water age and flow at Great Sand Dunes National Monument, south-central Colorado. [Reston, Va.]: U.S. Dept. of the Interior, U.S. Geological Survey, 2004.

Cerca il testo completo
Gli stili APA, Harvard, Vancouver, ISO e altri
6

Rupert, Michael. Ground-water age and flow at Great Sand Dunes National Monument, south-central Colorado. [Reston, Va.]: U.S. Dept. of the Interior, U.S. Geological Survey, 2004.

Cerca il testo completo
Gli stili APA, Harvard, Vancouver, ISO e altri
7

Rupert, Michael. Ground-water age and flow at Great Sand Dunes National Monument, south-central Colorado. [Reston, Va.]: U.S. Dept. of the Interior, U.S. Geological Survey, 2004.

Cerca il testo completo
Gli stili APA, Harvard, Vancouver, ISO e altri
8

Rupert, Michael. Ground-water age and flow at Great Sand Dunes National Monument, south-central Colorado. [Reston, Va.]: U.S. Dept. of the Interior, U.S. Geological Survey, 2004.

Cerca il testo completo
Gli stili APA, Harvard, Vancouver, ISO e altri
9

Rupert, Michael. Ground-water flow direction, water quality, recharge sources, and age, Great Sand Dunes National Monument, south-central Colorado, 2000-2001. Reston, Va: U.S. Dept. of the Interior, U.S. Geological Survey, 2004.

Cerca il testo completo
Gli stili APA, Harvard, Vancouver, ISO e altri
10

Rupert, Michael. Ground-water flow direction, water quality, recharge sources, and age, Great Sand Dunes National Monument, south-central Colorado, 2000-2001. Reston, Va: U.S. Dept. of the Interior, U.S. Geological Survey, 2004.

Cerca il testo completo
Gli stili APA, Harvard, Vancouver, ISO e altri
Più fonti

Capitoli di libri sul tema "Sand dunes South Australia"

1

Bardgett, Richard. "Soil and the Distant Past". In Earth Matters. Oxford University Press, 2016. http://dx.doi.org/10.1093/oso/9780199668564.003.0006.

Testo completo
Abstract (sommario):
Rainbow Beach is a small town on the coastal dunes of eastern Australia, near Brisbane. I had travelled there to meet with some colleagues to sample soils from the vast coastal sand dunes that surround the area. It might seem an unusual place to visit to collect soil, but a unique sequence of soils has formed in the sand dunes, which differ greatly in age. As you move inland from the sea, the soils get progressively older and deeper, and more weathered and nutrient-poor. The youngest soils are shallow, having only just started to form in recent sand dunes, whereas the oldest soils are around half a million years old and can reach 25 metres deep. These are among the oldest, deepest, and most weathered soils that I have sampled, and what I recall most vividly is how stunted and sparse the vegetation was that grew there, reflecting their struggle to grow in such ancient, weathered soil. The soils of Rainbow Beach are by no means the oldest on Earth. Hidden beneath ice sheets in Greenland, scientists recently discovered a soil that was 2.7 million years old, a remnant of the fertile tundra that covered the area before the ice sheets came. And scientists working in South Africa recently discovered a soil, now compacted in rock, that is 3 billion years old. One of the most fascinating things about soil is that it is incredibly diverse; soils vary enormously across continents, countries, and from valley to valley and field to field. Even within a small patch of land, such as a field, forest, or vegetable garden, the underlying soil can vary considerably. Over distances of metres, it might differ in its texture and depth, and in its pH, being acid in one patch of a field and neutral in another. Soils also vary greatly in the diversity of living organisms that live within them. I will go into more detail about the diversity of soil life later in this book; but for now suffice to say that it is vast. Soils also change with time.
Gli stili APA, Harvard, Vancouver, ISO e altri
2

Maun, M. Anwar. "The Ammophila problem". In The Biology of Coastal Sand Dunes. Oxford University Press, 2009. http://dx.doi.org/10.1093/oso/9780198570356.003.0012.

Testo completo
Abstract (sommario):
Even a cursory look on foredune plant communities shows vigorous dense stands of dune species in areas with moderate recurrent sand accretion levels specific for each plant species (Disraeli 1984; Maun and Baye 1989; Maun 1998). The phenomenon has been well documented in species of Ammophila arenaria (Carey and Oliver 1918; Tansley 1953), Corynephorus canescens (Marshall 1965), A. breviligulata (Eldred and Maun 1982) and Calamovilfa longifolia (Maun 1985). Burial has a positive influence on growth and flowering of plants and debilitated populations of foredune plant species can be rejuvenated by sand deposition (Maun 1998). Clear evidence of this phenomenon was presented by Maze and Whalley (1992a), who examined population dynamics of Spinifex sericeus in five zones receiving different amounts of sand deposition on a coastal dune system of Australia: the sea side of the first dune ridge, crest of first dune ridge, swale, Acacia thickets and stable hind dunes. In the very dynamic area on the sea side or toe of the first dune ridge (high beach) with regular burial or erosion of up to 1 m or more the plants produced very vigorous stolons with long internodes. On the crest of the dune ridge with sand deposition of about 17.5 cm per year even though plants had fewer stolons, they responded to burial by growing upwards with long internodes. In Acacia thickets in spite of very little sand deposition, plants were vigorous with little or no dead material, produced stolons and grew upwards with some long and some short internodes, probably because of greater nitrogen content in the soil. However, in the swale (slack) with little or no sand deposition, plants showed strong clumping tendency with very short internodes, a large amount of dead material on the surface and very low vigour. Unburied nodes usually died. Similarly, in the stable sand dunes with little or no sand deposition debilitated low-vigour clumps with very few stolons were abundant. Another example of this decline was presented by Martin (1959) on a shoreline along the Atlantic coast of North Carolina. He measured deposition and deflation of sand on two transects and showed that as one moved inland from the shoreline the total deposition of sand decreased.
Gli stili APA, Harvard, Vancouver, ISO e altri
3

Maun, M. Anwar. "Seed germination and seedling establishment". In The Biology of Coastal Sand Dunes. Oxford University Press, 2009. http://dx.doi.org/10.1093/oso/9780198570356.003.0010.

Testo completo
Abstract (sommario):
For the transformation of a seed to a seedling complex physical and biochemical changes occur within a seed before germination can proceed. Germination is controlled by diverse seed dormancy mechanisms in plant species that delays germination until the conditions are most favourable for seed germination and seedling establishment (Thompson 1970). Baskin and Baskin (1998) identified four benefits for the evolution of seed dormancy in plants: (i) persistence in risky environments as seed banks, (ii) decreased intraspecific competition, (iii) improved chances of seedling establishment and (iv) increased fitness (seed production) of the individual and the species as a whole. They showed that seed dormancy may be caused by any one of physiological, morphological, physical, chemical and mechanical constraints or by a combination of more than one of these factors. For instance, seeds may possess an embryo with a physiological inhibiting mechanism, immature embryo, impermeable seed coat or may contain chemical inhibitors and hard woody fruit walls. In all of these cases seed dormancy is eventually broken by one or more of the following treatments: after ripening, heat treatment, cold temperature stratification, prolonged exposure to high temperatures, exposure to light, softening of seed coat by microbes or physical scarification, leaching of inhibiting chemicals, ageing of seeds and other subtle changes in the habitat. In temperate North America with snow cover during winter months the seeds of a large majority of sand dune species—Cakile edentula, Ammophila breviligulata, Calamovilfa longifolia, Iva imbricata, Croton punctatus, Uniola paniculata—and others require cold stratification at <4°C for 4–6 weeks to break their dormancy requirements. Seeds of some species such as A. breviligulata and U. paniculata that require cold stratification at the northern end of their range lose this requirement in the south (Seneca 1972). At southern locations exposure to high temperatures may be required to fulfil the dormancy requirements. Winter annuals, Vulpia ciliata, Cerastium atrovirens, Mibora minima and Saxifraga tridactylites, that grow and mature their seeds in early summer on sand dunes at Aberffraw, North Wales, require exposure to high soil temperatures to overcome a state of dormancy in a certain proportion of seeds at the time of dispersal (Carey and Watkinson 1993; Pemadasa and Lovell 1975).
Gli stili APA, Harvard, Vancouver, ISO e altri
4

Moore, Christopher R., Mark J. Brooks, I. Randolph Daniel, Andrew H. Ivester, James K. Feathers e Terry E. Barbour. "Regional Manifestations of Late Quaternary Climate Change and Archaeological Site Burial Along the South Atlantic Coastal Plain". In Early Human Life on the Southeastern Coastal Plain, 193–235. University Press of Florida, 2018. http://dx.doi.org/10.5744/florida/9781683400349.003.0010.

Testo completo
Abstract (sommario):
Archaeological site investigations on the South Atlantic Coastal Plain have revealed stratified cultural remains in sand deposits of mixed aeolian and fluvial origins, aeolian sand sheets and dunes, alluvial terraces, and Carolina Bay rims. These sites are typically shallow but have yielded discernible archaeostratigraphy within sand dominated deposits by using luminescence dating (OSL), AMS radiocarbon dating, and close interval sediment sampling. Periods of site burial are linked to regional and global paleoclimate records, including Bond events, and provide broader reconstructions for human ecology and periods of site burial.
Gli stili APA, Harvard, Vancouver, ISO e altri
5

Zeitlin, Steve. "Poetry on the Porch". In The Poetry of Everyday Life. Cornell University Press, 2016. http://dx.doi.org/10.7591/cornell/9781501702358.003.0008.

Testo completo
Abstract (sommario):
In this chapter, the author recalls how his family would spend afternoons and evenings reading poems on the screened porch overlooking the sand dunes, the beach, and the sea in a rented house in Garden City, South Carolina. His father-in-law, Lucas, eagerly anticipates those times, bringing along his 101 Favorite Poems, published in 1929. But they all bring a few poems to the porch—even the children. At age ten their nephew Aidan Powers came equipped with a full set of Shel Silverstein's ingenious poetry. Masterpieces and ditties are treated with equal weight: poems by Percy Bysshe Shelley, John Keats, William Wordsworth, and Lord Byron are interspersed with children's poetry and nonsense verses. The evenings of poetry reading on the porch at the beach were so enjoyed by the family that they spawned poetry nights in the Dargan living room back in Darlington, South Carolina, on a weekly basis.
Gli stili APA, Harvard, Vancouver, ISO e altri
6

Soto, María-Victoria, Misael Cabello e Joselyn Arriagada-González. "Current Geodynamics and Evolutionary Trends of a Headland Bay Beach System in the Semi-Arid Coast of Chile". In Coastal Environments. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.94967.

Testo completo
Abstract (sommario):
The Chilean coast is controlled by the tectonics and structure, generating an irregular coastal landscape, with bays, marine terraces, sandy and gravel beaches, sand dune fields and Andean slopes, forming some mega cliffs that are attacked by waves. The Chilean coastline is shaped by headland bay beaches, with a dynamic coast modeled by south-western winds and south–north longshore current. We analyzed the case of the Coquimbo mega headland bay beach, which consists of four headland bay beaches. A methodological study was carried out on the morphometric parameters of the shoreline and the types of beaches dominated by waves along with geomorphological analysis of the coastal zone. We observed a mass transfer process from south to north. The northern sections of the bays are the places with the densest sand dune fields. This concentration of dunes occurs in each bay individually and in the mega bay as well. The sedimentary supply comes from Andean catchments to the shoreline and is transported and reworked by the longshore current to the northern area, where a huge sand field dune has developed, 120 km away from the mouth of Limarí River, the most southern catchment in the study area. In the mega bay, the current trend is a continuous sedimentary supply, despite the semi-arid conditions and the extreme drought that has affected the area since 2011. The study area is also a popular destination in Chile for beach tourism and is a place of interest for the mining industry.
Gli stili APA, Harvard, Vancouver, ISO e altri
7

Van de Noort, Robert. "Archipelagos and islands". In North Sea Archaeologies. Oxford University Press, 2011. http://dx.doi.org/10.1093/oso/9780199566204.003.0011.

Testo completo
Abstract (sommario):
The North Sea is not renowned for its islands, and much of the modern land–sea interface is sharp, especially along the coasts of Jutland, North and South Holland and much of England. Nevertheless, the North Sea does contain a surprisingly large number of islands and archipelagos, which can be presented with reference to a clear north–south divide. In the northern half of the North Sea, most islands are of hard rock with shallow soils, and their islandness is the result of ongoing glacio-isostatic uplift of previously drowned lands and sea-level rise. With the exception of the Shetland and Orkney archipelagos, few of these islands are found at a great distance from the mainland, and the majority of the countless islands, islets, and rock outcrops off the North Sea coasts of Norway, Sweden, Scotland, and north-east England can be found within a few miles of the mainland. In the southern half of the North Sea, the islands are mainly made up of sand and clay and, in their history if not today, were frequently sandbanks formed by the sea utilizing both marine and riverine sediments. Most of the islands of the Wadden Sea in Denmark, Germany, and Holland are sandbanks elevated by aeolian-formed sand dunes. Further south, the core of the large islands of Zeeland is principally formed of riverine sands and marine clays intercalated with peat, reflecting coastal wetland conditions at various times in the Post-glacial and Holocene (Vos and Van Heeringen 1997). As with Zeeland, the islands on the English side of the North Sea, such as Mersey Island in the Blackwater estuary and Foulness Island in Essex, have now been incorporated into the mainland. Only a few islands cannot be so simply classified:Helgoland in the German Bight, a Sherwood Sandstone stack of Triassic date, is the best known example. Island archaeology, as we have seen (chapter 2), has for many decades approached islands as environments that were relatively isolated from the wider world.
Gli stili APA, Harvard, Vancouver, ISO e altri
8

Chaplin, Stephen J., e Hal M. Watson. "The Geography of Imperilment: Targeting Conservation toward Critical Biodiversity Areas". In Precious Heritage. Oxford University Press, 2000. http://dx.doi.org/10.1093/oso/9780195125191.003.0012.

Testo completo
Abstract (sommario):
The Lake Wales Ridge stretches out along Florida’s central spine, pointing southward like an arrow toward Lake Okeechobee and the Everglades beyond. The “river of grass,” as the Everglades are known, attracts visitors from around the world to experience this unique ecosystem and view its immense wildlife concentrations. Compared to its famous neighbor to the south, the Lake Wales Ridge is virtually unknown to the public. From a biological perspective, though, these low, scrub-covered sand hills are of perhaps greater interest than the immense wetlands of the Everglades, because the ancient sand dunes that form this ridge are home to some of the most distinctive and highly localized species in the world. Yet most of the scrub vegetation that supports these species has been destroyed, replaced by agriculture and housing developments: Only about 15% of this unique habitat remains (Menges 1997). Among the rarest of the ridge’s inhabitants is the Lake Placid scrub mint (Dicerandra frutescens), known from just a handful of localities. This mint produces chemicals that have a powerful deterrent effect on insects and that could provide the key to developing new forms of insect repellents useful to people (Eisner et al. 1990). Although these chemicals protect the mint from being devoured by insects, the plant has little protection against the development pressures that threaten it. Another resident of the ridge is the yellow scrub balm (Dicerandra christmanii), a closely related mint that has an even more restricted distribution. Both of these plants are regarded as critically imperiled (GI), and both are listed by the federal government as endangered. Sharing the Lake Wales Ridge with these rare plants is the Florida scrub jay (Aphelocoma coerulescens), a bird that is mostly restricted to the scrub along Florida’s central ridge but occurs in scattered locations along Florida’s Gulf and Atlantic Coasts as well. Florida scrub jays have the unusual characteristic of living in family groups. To survive in a particular location, these birds need a large enough area of suitable habitat to support a number of these family groupings. This species is regarded as vulnerable (G3) and listed as threatened under the Endangered Species Act.
Gli stili APA, Harvard, Vancouver, ISO e altri
9

Fant, Clyde E., e Mitchell G. Reddish. "Patara". In A Guide to Biblical Sites in Greece and Turkey. Oxford University Press, 2003. http://dx.doi.org/10.1093/oso/9780195139174.003.0040.

Testo completo
Abstract (sommario):
In ancient times Patara possessed one of the best harbors on the Lycian coast. Modern visitors will be forced to use their imaginations to visualize the port of Patara, since the harbor eventually fell victim to the effects of silting from the Xanthos River. Today a beach and sand dunes cover the mouth of the ancient harbor, while the inner part of the harbor is now a marsh. Patara served as the port city for Xanthos, the leading city of the region of Lycia, which was located about 6 miles up the Xanthos River. Patara is located on the southwestern shore of Turkey, due east from the island of Rhodes. It is situated about halfway between Fethiye and Kale, near the present-day village of Gelemiş, about 3.5 miles south of the modern road (highway 400) that runs along Turkey’s Mediterranean shore. Patara is approximately 6 miles east of the mouth of the Xanthos River. A stream from the Xanthos flowed into the sea at Patara and deposited the river’s silt there. Important in the past because of its harbor, the area around Patara is known today for its 11 miles of excellent, sandy beaches. Supposedly named after Patarus, a son of Apollo, the city was famous in antiquity for its Temple of Apollo (no archaeological evidence of the temple has yet been found) and the oracle of Apollo. According to ancient tradition, Apollo liked to spend the winter at Patara and thus the oracle of Apollo was operative only during the winter months. Pottery finds at Patara provide evidence for a settlement here as early as the 6th century B.C.E. In 334–333 B.C.E. Patara, along with several other Lycian cities, surrendered to Alexander the Great. During the subsequent Hellenistic period, the city came first under the control of the Ptolemies and then the Seleucids. Ptolemy II Philadelphus (r. 282–246 B.C.E.) expanded the city and renamed it Arsinoe in honor of his wife, but the new name never took hold. In 196 B.C.E., the Seleucid ruler Antiochus III of Syria captured several Lycian cities, including Patara.
Gli stili APA, Harvard, Vancouver, ISO e altri
10

Peters, Debra P. C., e Robert P. Gibbens. "Plant Communities in the Jornada Basin: The Dynamic Landscape". In Structure and Function of a Chihuahuan Desert Ecosystem. Oxford University Press, 2006. http://dx.doi.org/10.1093/oso/9780195117769.003.0014.

Testo completo
Abstract (sommario):
Plant communities of the Jornada Basin are characteristic of the northern Chihuahuan Desert both in structure and dynamics. Although a number of plant communities can be differentiated, five major vegetation types are often distinguished that differ in plant species cover and composition, as well as other factors, such as animal populations, soil properties, and elevation. These five types are black grama (Bouteloua eriopoda) grasslands, playa grasslands, tarbush (Flourensia cernua) shrublands, creosotebush (Larrea tridentata) shrublands, and mesquite (Prosopis grandulosa) shrublands. Similar to many other parts of the Chihuahuan Desert, these plant communities have experienced major shifts in vegetation composition over the past 50–150 years (York and Dick-Peddie 1969). The most dramatic changes in vegetation and associated ecosystem processes have occurred as a result of a shift in life form due to woody plant encroachment into perennial grasslands (Grover and Musick 1990; Bahre and Shelton 1993). This encroachment of shrubs has occurred in many arid and semiarid regions of the world, including the Western United States, northern Mexico, southern Africa, South America, New Zealand, and Australia (McPherson 1997; Scholes and Archer 1997). A number of drivers have been implicated in these grass–shrub dynamics, including various combinations of livestock grazing, small animal activity, drought, changes in fire regime, and changes in climate (Humphrey 1958; Archer 1989; Allred 1996; Reynolds et al. 1997; Van Auken 2000). The causes of shrub invasion are quite variable and often poorly understood, although the consequences consistently lead to the process of desertification (Schlesinger et al. 1990). This chapter describes the characteristics of each vegetation type and the documented changes in each type at the Jornada Basin. We then discuss the key drivers influencing these dynamics. Vegetation in the Chihuahuan Desert region has been classified as desert-grassland transition (Shreve 1917), desert savanna (Shantz and Zon 1924), desert plains grasslands (Clements 1920), desert shrub grassland (Darrow 1944), and shrubsteppe (Kuchler 1964). Desert grassland is often used as a general descriptive name for the area (McClaran 1995), although landscapes at the Jornada and throughout the northern Chihuahuan Desert often consist of a mosaic of desert grasslands, Chihuahuan Desert shrublands, and plains-mesa sand scrub (Dick-Peddie 1993).
Gli stili APA, Harvard, Vancouver, ISO e altri

Atti di convegni sul tema "Sand dunes South Australia"

1

Cox, Randel Tom. "SOUTHERLY PREVAILING PALEOWINDS RECORDED BY LATE PLEISTOCENE EOLIAN SAND DUNES IN THE LOWER MISSISSIPPI VALLEY". In 52nd Annual GSA South-Central Section Meeting - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018sc-310049.

Testo completo
Gli stili APA, Harvard, Vancouver, ISO e altri
2

Warner, Abbey, Allen Gontz, Patrick A. Hesp e Graziela Miot da Silva. "BEACHES, DUNES AND BLOWOUTS – USING GPR TO RELATE COASTAL FEATURES AND CLIMATES, COORONG LAGOON, SOUTH AUSTRALIA". In GSA Annual Meeting in Indianapolis, Indiana, USA - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018am-319858.

Testo completo
Gli stili APA, Harvard, Vancouver, ISO e altri
3

Gontz, Allen, Daniel Ellerton, Talitha Santini, Adrian McCallum e James Shulmeister. "GPR SIGNATURES OF THE GIANT PODZOL SEQUENCES ON THE SAND DUNES OF GREAT SANDY NATIONAL PARK, QUEENSLAND, AUSTRALIA". In GSA Annual Meeting in Indianapolis, Indiana, USA - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018am-322842.

Testo completo
Gli stili APA, Harvard, Vancouver, ISO e altri
4

Rubiano, Romeo R., Andrew Atkinson e Elizabeth A. Heise. "ANTHROPOGENIC EFFECTS TO SAND DUNES ON BARRIER ISLANDS: BRAZOS SANTIAGO PASS AND PORT MANSFIELD PASS, SOUTH PADRE ISLAND, TX". In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-287369.

Testo completo
Gli stili APA, Harvard, Vancouver, ISO e altri
5

Chen*, Weitao. "Geomorphology, Architecture and Genesis of Miocene Isolated Shelf Sand Bodies in the Pearl River Mouth Basin, Northern South China Sea". In International Conference and Exhibition, Melbourne, Australia 13-16 September 2015. Society of Exploration Geophysicists and American Association of Petroleum Geologists, 2015. http://dx.doi.org/10.1190/ice2015-2190397.

Testo completo
Gli stili APA, Harvard, Vancouver, ISO e altri
6

Wang*, Zhenfeng, Zhipeng Sun, Minggang Guo e Rufeng Jiang. "The Sand-Rich Lobe-Complexes in the Central Canyon, Deepwater Qiongdongnan Basin, Northwestern South China Sea: Insights From New Wells". In International Conference and Exhibition, Melbourne, Australia 13-16 September 2015. Society of Exploration Geophysicists and American Association of Petroleum Geologists, 2015. http://dx.doi.org/10.1190/ice2015-2206059.

Testo completo
Gli stili APA, Harvard, Vancouver, ISO e altri
7

Salzman, S. A., G. Allinson, F. Stagnitti, R. J. Hill, L. Thwaites, D. Ierodiaconou, R. Carr, J. Sherwood e V. Versace. "Adsorption and desorption characteristics of fluoride in the calcareous and siliceous sand sheet aquifers of south-west Victoria, Australia". In WATER POLLUTION 2008. Southampton, UK: WIT Press, 2008. http://dx.doi.org/10.2495/wp080161.

Testo completo
Gli stili APA, Harvard, Vancouver, ISO e altri
8

Slayter, David L., Christopher S. Hitchcock, Mike Oehlers e Richard Chiles. "Automated Least-Cost Pipeline Route Development in Niger Using Remotely-Sensed Imagery and GIS". In 2010 8th International Pipeline Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ipc2010-31305.

Testo completo
Abstract (sommario):
An important part of successful pipeline route selection includes the identification of geologic hazards and man-made (anthropogenic) features along any proposed route. Fugro William Lettis & Associates, Inc. (Fugro WLA) was contracted to provide a preferred crude oil transmission pipeline route between the Agadem oil field and the Zinder refinery in south-central Niger. The development of the 460-km long, 500-meter wide corridor involved the use of new geologic mapping and a digital elevation model (DEM) derived from Satellite Pour l’Observation de la Terre (SPOT) remotely-sensed imagery and SPOT High Resolution Stereo (HRS), respectively. The base geologic, anthropogenic and DEM data were provided by Fugro NPA Ltd. (Fugro NPA) and augmented with additional mapping by Fugro WLA. The area of the proposed pipeline route covers varying geologic conditions such as active and relict sand dunes, bedrock outcrops and escarpments, wadis and areas of recent erosion. Anthropogenic features included reservoirs, roads, towns and settlements, agricultural areas and oases. Our study found significant height differences between the dunes and evidence for varying dune activity. Selection of the optimal pipeline route required minimization of total elevation change and exposure to geologic hazards and existing anthropogenic development while obtaining the safest, most direct and economic route between the oil field and refinery. Using a geographic information system (GIS) the digitally-mapped geologic and anthropogenic features and elevation-derived parameters were assigned a relative risk ranking surface. Next, a cumulative cost distance surface and a cost path surface were created between the oil field and the refinery. Lastly, using GIS we developed a least-cost pipeline route option from the cost path surface.
Gli stili APA, Harvard, Vancouver, ISO e altri

Rapporti di organizzazioni sul tema "Sand dunes South Australia"

1

Chiu, Ching-Sang, D. B. Reeder, Steven R. Ramp e Christopher W. Miller. Cruise Report: South China Sea Upper Slope Sand Dunes Project, May 8-14, 2013. Fort Belvoir, VA: Defense Technical Information Center, giugno 2013. http://dx.doi.org/10.21236/ada609900.

Testo completo
Gli stili APA, Harvard, Vancouver, ISO e altri
2

Reeder, Benjamin. Characterization of the Upper Slope Sand Dunes in the South China Sea and their Impact on Acoustic Propagation. Fort Belvoir, VA: Defense Technical Information Center, settembre 2012. http://dx.doi.org/10.21236/ada575078.

Testo completo
Gli stili APA, Harvard, Vancouver, ISO e altri
3

Ramp, Steven R. Submarine Sand Dunes on the Continental Slope in the South China Sea and Their Impact on Internal Wave Transformation and Acoustic Propagation. Fort Belvoir, VA: Defense Technical Information Center, settembre 2013. http://dx.doi.org/10.21236/ada598325.

Testo completo
Gli stili APA, Harvard, Vancouver, ISO e altri
4

Ramp, Steven R. Submarine Sand Dunes on the Continental Slope in the South China Sea and Their Impact on Internal Wave Transformation and Acoustic Propagation. Fort Belvoir, VA: Defense Technical Information Center, settembre 2014. http://dx.doi.org/10.21236/ada623623.

Testo completo
Gli stili APA, Harvard, Vancouver, ISO e altri
5

Chiu, Ching-Sang. Measurements and Analysis of Phenomenology and Statistics of Sound Propagation Over Sand Dunes on Upper Slope of the Northeastern South China Sea. Fort Belvoir, VA: Defense Technical Information Center, settembre 2012. http://dx.doi.org/10.21236/ada574815.

Testo completo
Gli stili APA, Harvard, Vancouver, ISO e altri
Ti possono interessare anche gli elenchi estesi di opere sul tema "Sand dunes South Australia":
Articoli di riviste Tesi Libri
Offriamo sconti su tutti i piani premium per gli autori le cui opere sono incluse in raccolte letterarie tematiche. Contattaci per ottenere un codice promozionale unico!

Vai alla bibliografia