Relevant bibliographies by topics / Megafan

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Academic literature on the topic 'Megafan'

Author: Grafiati
Published: 4 June 2021
Last updated: 7 February 2022

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Journal articles on the topic "Megafan"

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Mouchené, Margaux, Peter van der Beek, Sébastien Carretier, and Frédéric Mouthereau. "Autogenic versus allogenic controls on the evolution of a coupled fluvial megafan–mountainous catchment system: numerical modelling and comparison with the Lannemezan megafan system (northern Pyrenees, France)." Earth Surface Dynamics 5, no. 1 (2017): 125–43. http://dx.doi.org/10.5194/esurf-5-125-2017.

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Abstract. Alluvial megafans are sensitive recorders of landscape evolution, controlled by both autogenic processes and allogenic forcing, and they are influenced by the coupled dynamics of the fan with its mountainous catchment. The Lannemezan megafan in the northern Pyrenean foreland was abandoned by its mountainous feeder stream during the Quaternary and subsequently incised, leaving a flight of alluvial terraces along the stream network. We use numerical models to explore the relative roles of autogenic processes and external forcing in the building, abandonment and incision of a foreland megafan, and we compare the results with the inferred evolution of the Lannemezan megafan. Autogenic processes are sufficient to explain the building of a megafan and the long-term entrenchment of its feeding river on time and space scales that match the Lannemezan setting. Climate, through temporal variations in precipitation rate, may have played a role in the episodic pattern of incision on a shorter timescale. In contrast, base-level changes, tectonic activity in the mountain range or tilting of the foreland through flexural isostatic rebound do not appear to have played a role in the abandonment of the megafan.
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Cordeiro, Carlos L. O., Dilce F. Rossetti, Rogério Gribel, et al. "Impact of sedimentary processes on white-sand vegetation in an Amazonian megafan." Journal of Tropical Ecology 32, no. 6 (2016): 498–509. http://dx.doi.org/10.1017/s0266467416000493.

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Abstract:Amazonian white-sand vegetation has unique tree communities tolerant to nutrient-poor soils of interest for interpreting processes of adaptation in neotropical forests. Part of this phytophysionomy is confined to Late Quaternary megafan palaeo-landforms, thus we posit that sedimentary disturbance is the main ecological factor controlling tree distribution and structuring in this environment. In this study, we characterize the topographic trend of one megafan palaeo-landform using a digital elevation model and verify its relationship to the forest by modelling the canopy height with remote sensing data. We also compare the composition and structure (i.e. canopy height and diameter at breast height) of tree groups from the outer and inner megafan environments based on the integration of remote sensing and floristic data. The latter consist of field inventories of trees ≥ 10 cm dbh using six (500 × 20 m) plots in várzea, terra firme and igapó from the outer megafan and 20 (50 × 20 m) plots in woodlands and forests from the inner megafan. The unweighted pair group method with arithmetic mean (UPGMA) and the non-metric multidimensional scaling (NMDS) were applied for clustering and dissimilarity analyses, respectively. The megafan is a sand-dominated triangular wetland with a topographic gradient of < 15 cm km−1, being more elevated along its axis. The outer megafan has a higher number of tree species (367), taller canopy height (mean of 14.1 m) and higher diameter at breast height (mean of 18.2 cm) than the white-sand forest. The latter records 89 tree species, mean canopy height of 8.4 cm and mean diameter at breast height of 15.3 cm. Trees increase in frequency closer to channels and toward the megafan's axis. The flooded and nutrient-poor sandy megafan substrate favoured the establishment of white-sand vegetation according to the overall megafan topography and morphological heterogeneities inherent to megafan sub-environments.
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Shukla, U. K., I. B. Singh, M. Sharma, and S. Sharma. "A model of alluvial megafan sedimentation: Ganga Megafan." Sedimentary Geology 144, no. 3-4 (2001): 243–62. http://dx.doi.org/10.1016/s0037-0738(01)00060-4.

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Houben, Georg J., Stephan Kaufhold, Roy McG Miller, et al. "Stacked megafans of the Kalahari Basin as archives of paleogeography, river capture, and Cenozoic paleoclimate of southwestern Africa." Journal of Sedimentary Research 90, no. 9 (2020): 980–1010. http://dx.doi.org/10.2110/jsr.2020.46.

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ABSTRACT The Cenozoic Kalahari Basin covers large parts of southern Africa. A continuous 400 m core was obtained in northern Namibia and analyzed in detail. Here, we present sedimentological, geochemical, mineralogical, granulometric, and hydraulic data, which were used to derive the sedimentation history and the Cenozoic paleoclimate and paleogeography of SW Africa. The first absolute ages for the Kalahari Basin were obtained by dating of calcretes, which showed that the core covers almost the entire Cenozoic. Two megafans could be distinguished. The older, buried Olukonda Megafan stems from a mafic source rock, potentially the Kunene Intrusive Complex, and was deposited by a paleo–Kunene River towards the southeast and east, under a semiarid climate. The younger Cubango Megafan (Andoni Formation) has a completely different provenance, namely felsic metamorphic and granitoid rocks, transported from the north by the Cubango River. The capture of the Kunene towards the Atlantic during the Eocene resulted in this change in provenance. Despite the distinct differences between the formations, the temporal hiatus between them must have been short. The results are a showcase of the potential of megafans for hosting major deep freshwater aquifers.
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McGlue, Michael M., Renato Lada Guerreiro, Ivan Bergier, et al. "Holocene stratigraphic evolution of saline lakes in Nhecolândia, southern Pantanal wetlands (Brazil)." Quaternary Research 88, no. 3 (2017): 472–90. http://dx.doi.org/10.1017/qua.2017.57.

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AbstractNhecolândia is a fossil lobe of the Taquari River megafan and a prominent geomorphic subunit of the Pantanal wetlands because of the presence of >10,000 small lakes. We investigated the stratigraphic records of three saline lakes from Nhecolândia to explore their potential as Quaternary hydroclimate archives. Radiocarbon data indicate that accumulation at two lakes was approximately continuous in the late Holocene, and chemostratigraphic variability suggests sensitivity to environmental change with multicentennial resolution. A basal sandy unit and an upper muddy unit comprise the shallow stratigraphy of each lake. A pronounced change in depositional environment from freshwater wetlands to saline lakes at ~3300–3200 cal yr BP best explains the lithofacies transition. Ephemeral freshwater wetlands formed on the abandoned megafan lobe, which was molded by deflation in the arid early Holocene. Wind-scouring of the megafan lobe generated topographically closed depressions with complex marginal sand ridges, which allowed permanent lakes to evolve when rainfall increased in the late Holocene. The lakes became highly saline and alkaline after ~910 cal yr BP, which influences biogeochemistry and aquatic ecology. The results hold implications for understanding the response of the southern Pantanal to climate change, as well as the development of pans in tropical megafan settings.
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LATRUBESSE, Edgardo Μ., Jean BOCQUENTIN, José Carlos R. SANTOS, and Carlos G. RAMONELL. "PALEOENVIRONMENTAL MODEL FOR THE LATE CENOZOIC OF SOUTHWESTERN AMAZONIA: PALEONTOLOGY AND GEOLOGY." Acta Amazonica 27, no. 2 (1997): 103–17. http://dx.doi.org/10.1590/1809-43921997272118.

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Our study provides paleontological and geological data substantiating a paleoenvironmental model for the upper Miocene-Pliocene of Southwestern Amazonia. The extensive Late Tertiary sediments of The Solimões Formation, outcropping in Southwestern Amazonia, were deposited by a complex megafan system, originating in the high Peruvian Andes. The megafan system was the sedimentological response to the Andean Quechua tectonic phase of Tertiary age, producing sediments that fdled the foreland basin of Southwestern Amazonia. Occurrences of varied vertebrate fossil assemblages of the Huayquerian-Montehermosan Mammal age collected in these sediments support this interpretation. The fauna includes several genera and species of fishes, reptiles, birds, mammals and appears to be one that could have lived in or near a riverine habitat. In the Late Pliocene, the megafan system became inactive as a result of the influence of the Diaguita Tectonical Phase.
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Chakraborty, Tapan, and Parthasarathi Ghosh. "The geomorphology and sedimentology of the Tista megafan, Darjeeling Himalaya: Implications for megafan building processes." Geomorphology 115, no. 3-4 (2010): 252–66. http://dx.doi.org/10.1016/j.geomorph.2009.06.035.

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Gaurav, K., F. Métivier, O. Devauchelle, et al. "Morphology of the Kosi megafan channels." Earth Surface Dynamics 3, no. 3 (2015): 321–31. http://dx.doi.org/10.5194/esurf-3-321-2015.

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Abstract. We report on a new set of measurements on the morphology of braided and meandering threads of the Kosi megafan, North Bihar, India. All threads develop on a uniform sandy sediment and under a similar climate. The data set is composed of the width, depth, water discharge and grain size of 51 threads. Downstream slopes and sinuosity are also available. Using this data set, we show that braided and meandering threads share common hydraulic geometries. We then use the threshold theory to explain why the aspect ratio of threads is almost naturally detrended, and rescale the data according to this theory. As expected, the rescaled dimensions of braided and meandering threads are weakly correlated to water discharge. We propose that the large dispersion observed, which is common to meandering and braided threads, is the signature of sediment transport, vegetation or cohesion effects.
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Gaurav, K., F. Métivier, O. Devauchelle, et al. "Morphology of the Kosi megafan channels." Earth Surface Dynamics Discussions 2, no. 2 (2014): 1023–46. http://dx.doi.org/10.5194/esurfd-2-1023-2014.

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Abstract. We study the morphology of streams flowing on the alluvial megafan of the Kosi River in north Bihar, India. All streams develop on a uniform sandy sediment and under a similar climate, allowing for statistically significant comparisons. Our data set includes both channels from the braid of the Kosi River and channels from isolated single-thread rivers. Using an Acoustic Doppler Current Profiler, we measure the width, depth and water discharge of the channels. Their average slope is also acquired with a kinematic GPS. These morphological characteristics are strongly correlated with the discharge. However, rescaling the data according to the threshold channel theory removes most of this dependency. The rescaled data suggest that the threads of the Kosi River braid are morphologically similar to isolated channels.
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Singh, Harbhajan, B. Parkash, and K. Gohain. "Facies analysis of the Kosi megafan deposits." Sedimentary Geology 85, no. 1-4 (1993): 87–113. http://dx.doi.org/10.1016/0037-0738(93)90077-i.

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Dissertations / Theses on the topic "Megafan"

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Goswami, Swagata. "Geomorphology, hydrology and human-environment interactions in the Kosi megafan, India." Thesis, University of Oregon, 2019. http://hdl.handle.net/1794/24549.

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The continuing channel modification and change in the course of the River Kosi have got a greater implication on the geomorphic evolution processes within its megafan surface. A considerable portion of the land in Kosi megafan remains flooded and later waterlogged every year, a phenomenon that has been exacerbated by the rapid development of roads and railroads. Crop yields are also lowest in parts of the megafan where waterlogging is a bigger problem. This research applies GIS and remote sensing techniques to examine the Kosi channel change from 1975-2015 and map waterlogging and transport network driven ‘disconnectivity’ of the Kosi megafan located in the Indo-Gangetic Plains, India from 2005-2015. This study also used semi-structured interviews of 960 farm-households from four case studies to analyze farm-related changes, especially due to waterlogging and identify factors responsible for a farmer’s adaptation to waterlogging stress from 2014-2015. The findings reveal that there have been substantial changes in the main Kosi channel. The massive development in the road-rail transport network along with the increase in the minor channels within the megafan have led to staggering increase in transport-river intersections and foster both seasonal and permanent waterlogging. The case studies suggest that 90% of the farmers have made changes to their farms due to waterlogging and other factors associated with that. The study also shows that there are limits to adaptation, which are caused by barriers of available technology, knowledge and institutional frameworks. These barriers undermine the effectiveness of the initiatives promoted both at the national as well as local level.
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Lo, Edward Limin. "FLUVIAL-LACUSTRINE PROCESSES SHAPING THE LANDFORMS OF THE DISTAL PARAGUAY FLUVIAL MEGAFAN." UKnowledge, 2017. http://uknowledge.uky.edu/ees_etds/54.

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Tropical wetlands such as the Pantanal help regulate global biogeochemical cycles, but climate change is modifying these environments. Controls on environmental changes can potentially be assessed from ancient, well-dated lacustrine sedimentary records. An integrated field and laboratory approach was undertaken to study the limnogeology of Lake Uberaba in the northern Pantanal, and test whether the lake has preserved a reliable record of environmental change in its strata. This study was designed to understand how the basin accumulates sediment and to assess its sensitivity to hydroclimatic variability. The data showed that modern Lake Uberaba is a highly dynamic, freshwater fluvial-lacustrine basin. Modern lake floor sediments are largely siliciclastic silts, with limited organic matter content and abundant sponge spicules. This sedimentary composition reflects the lake’s open hydrology and well-mixed water column. Limited data from sediment cores indicates that Lake Uberaba may have formed ~1760 CE, following an abrupt transgression over an oxidized floodplain depositional environment. The stratal contact between lacustrine and floodplain deposits suggests the presence of an erosional unconformity, the timing and duration of which remains unknown. The environmental change favoring lake formation appears to be linked to increased effective precipitation provided by the Intertropical Convergence Zone (ITCZ) in the northern Pantanal.
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Leier, Andrew. "The Cretaceous Evolution of the Lhasa Terrane, Southern Tibet." Diss., Tucson, Ariz. : University of Arizona, 2005. http://etd.library.arizona.edu/etd/GetFileServlet?file=file:///data1/pdf/etd/azu%5Fetd%5F1340%5F1%5Fm.pdf&type=application/pdf.

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Kuerten, Sidney [UNESP]. "Evolução geomorfológica e mudanças ambientais no megaleque do Nabileque, quaternário do Pantanal mato-grossense." Universidade Estadual Paulista (UNESP), 2010. http://hdl.handle.net/11449/102880.

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Made available in DSpace on 2014-06-11T19:32:17Z (GMT). No. of bitstreams: 0 Previous issue date: 2010-09-02Bitstream added on 2014-06-13T19:42:48Z : No. of bitstreams: 1 kuerten_s_dr_rcla.pdf: 2917154 bytes, checksum: 1fef4e00aa5e9313d624978f26a3f118 (MD5)<br>Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>O megaleque fluvial do Nabileque é um sistema deposicional que vem sendo construído pelo rio Paraguai na borda sudoeste do Pantanal Mato-Grossense desde tempos pleistocênicos. É um sistema aluvial peculiar, pois não está associado a rios oriundos de relevos altos situados nos planaltos adjacentes à planície. Trata-se de um megaleque fluvial construído pelo rio Paraguai, rio-tronco coletor das águas do todo sistema hidrográfico do Pantanal, na saída do rio para a planície do Chaco, onde coalesce com o megaleque do Pilcomayo. Com base em dados de sensores remotos e verificação de campo, foi realizada compartimentação e caracterização geomorfológica do megaleque, que ocupa área de aproximadamente 9100 km². Descrição e datação dos depósitos dos compartimentos identificados permitiram elaborar modelo evolutivo para a área, cuja maior parte é ocupada por vasta planície aluvial pleistocênica (idades LOE entre 57,8 e 12,8 Ka AP), marcada pela presença de intrincada rede de paleocanais distributários de baixa sinuosidade a meandrantes. Feições fluviais erosivas e redes de canais tributários superimpostos evidenciam que as áreas de ocorrência dos depósitos pleistocênicos se encontram em degradação, embora sujeitas a frequentes inundações, responsáveis pela deposição de delgadas e irregulares coberturas de sedimentos mais recentes. Um aspecto notável é a existência de dois cinturões de meandros formados no Holoceno, em vales incisos na planície de depósitos pleistocênicos. O rio Paraguai corre hoje em um destes vales, que corta longitudinalmente o megaleque, ajustado a padrões de fratura NE associados ao lineamento Transbrasiliano, com deflexão para SSE ao se encontrar com o rio Negro (Bolívia), com o qual compõe a drenagem periférica do leque. No cinturão de meandros abandonado...<br>The Nabileque fluvial megafan is depositional system that has been built by the Paraguay River at the southwestern border of the Pantanal wetland since Pleistocene times. With an area of approximately 9100 km², it is a peculiar fan system because it is not associated with rivers flowing from adjacent plateaus. The Nabileque megafan has been forming by Paraguay River at the exit of the Pantanal wetland, in lateral coalescence with the Pilcomayo megafan of the Chaco basin. It is important to emphasize that, although the name is also used to name a small river within the wetland, the name Nabileque was adopted to designate the megafan because the whole area is known as the Pantanal of Nabileque. The establishement of its geomorphologic evolution was based on remote sensing data interpretation with field ground truthing, sediment vibrocore-sampling and optical luminescence dating (OSL). Most of the area is covered by alluvial deposits, which dating has revealed ages spanning from 57.8 to 12.8 ka BP, but probably older deposits are present that were not reached by vibrocoring. Distributary, low-sinuosity to meandering paleochannels are visible as ancient depositional geoforms, but the Pleistocene alluvial surface is degradational and the alluvial deposits have being affected by pedogenesis and dissected by tributary small channels. Despite its degradational nature, the area is inundated during exceptional flooding events; this process is responsible for reworking and depositing of thin and irregular layer of Holocene sediments capping the oldest deposits. Two Holocene meander belts, confined in broad and shallow incised-valleys, are conspicuous features and record paleo-hydrologic changes. One of them is an abandoned N-S meander belt, in which runs the Nabileque River that has a channel much smaller... (Complete abstract click electronic access below)
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Kuerten, Sidney. "Evolução geomorfológica e mudanças ambientais no megaleque do Nabileque, quaternário do Pantanal mato-grossense /." Rio Claro : [s.n.], 2010. http://hdl.handle.net/11449/102880.

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Orientador: Mario Luis Assine<br>Coorientador: Edna Maria Facincani<br>Banca: Sandra Baptista da Cunha<br>Banca: Mauro Parolin<br>Banca: Edvard Elias de Souza Filho<br>Banca: José Cândido Stevaux<br>Resumo: O megaleque fluvial do Nabileque é um sistema deposicional que vem sendo construído pelo rio Paraguai na borda sudoeste do Pantanal Mato-Grossense desde tempos pleistocênicos. É um sistema aluvial peculiar, pois não está associado a rios oriundos de relevos altos situados nos planaltos adjacentes à planície. Trata-se de um megaleque fluvial construído pelo rio Paraguai, rio-tronco coletor das águas do todo sistema hidrográfico do Pantanal, na saída do rio para a planície do Chaco, onde coalesce com o megaleque do Pilcomayo. Com base em dados de sensores remotos e verificação de campo, foi realizada compartimentação e caracterização geomorfológica do megaleque, que ocupa área de aproximadamente 9100 km². Descrição e datação dos depósitos dos compartimentos identificados permitiram elaborar modelo evolutivo para a área, cuja maior parte é ocupada por vasta planície aluvial pleistocênica (idades LOE entre 57,8 e 12,8 Ka AP), marcada pela presença de intrincada rede de paleocanais distributários de baixa sinuosidade a meandrantes. Feições fluviais erosivas e redes de canais tributários superimpostos evidenciam que as áreas de ocorrência dos depósitos pleistocênicos se encontram em degradação, embora sujeitas a frequentes inundações, responsáveis pela deposição de delgadas e irregulares coberturas de sedimentos mais recentes. Um aspecto notável é a existência de dois cinturões de meandros formados no Holoceno, em vales incisos na planície de depósitos pleistocênicos. O rio Paraguai corre hoje em um destes vales, que corta longitudinalmente o megaleque, ajustado a padrões de fratura NE associados ao lineamento Transbrasiliano, com deflexão para SSE ao se encontrar com o rio Negro (Bolívia), com o qual compõe a drenagem periférica do leque. No cinturão de meandros abandonado... (Resumo completo, clicar acesso eletrônico abaixo)<br>Abstract: The Nabileque fluvial megafan is depositional system that has been built by the Paraguay River at the southwestern border of the Pantanal wetland since Pleistocene times. With an area of approximately 9100 km², it is a peculiar fan system because it is not associated with rivers flowing from adjacent plateaus. The Nabileque megafan has been forming by Paraguay River at the exit of the Pantanal wetland, in lateral coalescence with the Pilcomayo megafan of the Chaco basin. It is important to emphasize that, although the name is also used to name a small river within the wetland, the name Nabileque was adopted to designate the megafan because the whole area is known as the Pantanal of Nabileque. The establishement of its geomorphologic evolution was based on remote sensing data interpretation with field ground truthing, sediment vibrocore-sampling and optical luminescence dating (OSL). Most of the area is covered by alluvial deposits, which dating has revealed ages spanning from 57.8 to 12.8 ka BP, but probably older deposits are present that were not reached by vibrocoring. Distributary, low-sinuosity to meandering paleochannels are visible as ancient depositional geoforms, but the Pleistocene alluvial surface is degradational and the alluvial deposits have being affected by pedogenesis and dissected by tributary small channels. Despite its degradational nature, the area is inundated during exceptional flooding events; this process is responsible for reworking and depositing of thin and irregular layer of Holocene sediments capping the oldest deposits. Two Holocene meander belts, confined in broad and shallow incised-valleys, are conspicuous features and record paleo-hydrologic changes. One of them is an abandoned N-S meander belt, in which runs the Nabileque River that has a channel much smaller... (Complete abstract click electronic access below)<br>Doutor
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Zani, Hiran. "Mudanças morfológicas na evolução do megaleque do Taquari : uma análise com base em dados orbitais /." Rio Claro : [s.n.], 2008. http://hdl.handle.net/11449/92779.

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Orientador: Maria Luis Assine<br>Banca: Márcio de Morisson Valeriano<br>Banca: Archimedes Perez Filho<br>Resumo: Esta dissertação visa caracterizar mudanças morfológicas recentes no megaleque do Taquari, através de dados de Sensoriamento Remoto. As baixas declividades do terreno e pequenas amplitudes das formas deposicionais, que predominam nesta paisagem, demandaram o desenvolvimento de métodos específicos para a extração das informações. Dados SRTM e imagens multiespectrais foram utilizados no mapeamento dos paleocanais e confecção de modelos digitais de elevação. A drenagem relicta foi mapeada através de desenho digital, sobre mosaicos georreferenciados dos sensores ASTER, MODIS e CBERS2. Nos vetores dos paleocanais identificados foi realizado cálculo de densidade areal e criados histogramas direcionais (rosetas), que ressaltaram relações topológicas e permitiram a interpretação de seis lobos deposicionais. Modelos digitais de elevação foram gerados através da subtração dos dados SRTM originais com uma superfície topográfica simplificada pelo método de regressão polinomial cúbica. Este processamento ressaltou zonas deprimidas no megaleque, espaços potenciais para acúmulo de sedimentos, e zonas de sobrelevadas, devido à processos agradacionais contínuos em determinadas áreas. A identificação e caracterização destas formas é passo inicial para a reconstituição dos eventos geomórficos e antevisão de futuras mudanças no curso do rio Taquari. A dinâmica de construção e abandono dos lobos mostrou-se mais complexa do que o apresentado em trabalhos anteriores, sendo de aspecto fragmentado e de natureza fractal.<br>Abstract: This work aims characterize morphological changes in Taquari megafan, by remote sensing techniques. Gentle slopes of landscape and low amplitudes of geoforms demands the development of specific methods to extract valuable topographic information. SRTM data and multispectral images were used to map paleochannels and to build digital elevation models (DEM). Relict streams were mapped by computer-aided design in GIS environment, using georeferenced mosaics of ASTER, CBERS and MODIS sensors. These vectors were used to calculate drainage density and directional histograms, revealing topological aspects and lead to interpret 6 depositional lobes. DEM was obtained by subtracting the original SRTM data from a simplified surface generated by cubic polynomial regression. This product revealed depressed areas in the Taquari megafan, potential accommodation spaces for deposition, and geoforms with a higher amplitude than their neighbor, probably because of continuous gradational processes in these specifics sites. The recognition of these landforms is the initial step for figure out the evolution of geomorphic events and to support a well done planning in land occupation. The dynamics of Taquari megafan showed to be more complex than previous studies proposed.<br>Mestre
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Zani, Hiran [UNESP]. "Mudanças morfológicas na evolução do megaleque do Taquari: uma análise com base em dados orbitais." Universidade Estadual Paulista (UNESP), 2008. http://hdl.handle.net/11449/92779.

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Made available in DSpace on 2014-06-11T19:26:11Z (GMT). No. of bitstreams: 0 Previous issue date: 2008-10-18Bitstream added on 2014-06-13T20:54:16Z : No. of bitstreams: 1 zani_h_me_rcla.pdf: 8429664 bytes, checksum: 62c5b99b684e6da2a2faa22d20ae412e (MD5)<br>Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)<br>Esta dissertação visa caracterizar mudanças morfológicas recentes no megaleque do Taquari, através de dados de Sensoriamento Remoto. As baixas declividades do terreno e pequenas amplitudes das formas deposicionais, que predominam nesta paisagem, demandaram o desenvolvimento de métodos específicos para a extração das informações. Dados SRTM e imagens multiespectrais foram utilizados no mapeamento dos paleocanais e confecção de modelos digitais de elevação. A drenagem relicta foi mapeada através de desenho digital, sobre mosaicos georreferenciados dos sensores ASTER, MODIS e CBERS2. Nos vetores dos paleocanais identificados foi realizado cálculo de densidade areal e criados histogramas direcionais (rosetas), que ressaltaram relações topológicas e permitiram a interpretação de seis lobos deposicionais. Modelos digitais de elevação foram gerados através da subtração dos dados SRTM originais com uma superfície topográfica simplificada pelo método de regressão polinomial cúbica. Este processamento ressaltou zonas deprimidas no megaleque, espaços potenciais para acúmulo de sedimentos, e zonas de sobrelevadas, devido à processos agradacionais contínuos em determinadas áreas. A identificação e caracterização destas formas é passo inicial para a reconstituição dos eventos geomórficos e antevisão de futuras mudanças no curso do rio Taquari. A dinâmica de construção e abandono dos lobos mostrou-se mais complexa do que o apresentado em trabalhos anteriores, sendo de aspecto fragmentado e de natureza fractal.<br>This work aims characterize morphological changes in Taquari megafan, by remote sensing techniques. Gentle slopes of landscape and low amplitudes of geoforms demands the development of specific methods to extract valuable topographic information. SRTM data and multispectral images were used to map paleochannels and to build digital elevation models (DEM). Relict streams were mapped by computer-aided design in GIS environment, using georeferenced mosaics of ASTER, CBERS and MODIS sensors. These vectors were used to calculate drainage density and directional histograms, revealing topological aspects and lead to interpret 6 depositional lobes. DEM was obtained by subtracting the original SRTM data from a simplified surface generated by cubic polynomial regression. This product revealed depressed areas in the Taquari megafan, potential accommodation spaces for deposition, and geoforms with a higher amplitude than their neighbor, probably because of continuous gradational processes in these specifics sites. The recognition of these landforms is the initial step for figure out the evolution of geomorphic events and to support a well done planning in land occupation. The dynamics of Taquari megafan showed to be more complex than previous studies proposed.
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Mouchené, Margaux. "Évolution post-orogénique du système couplé piémont/bassin versant : le méga-cône alluvial de Lannemezan et son bassin versant au Nord des Pyrénées." Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAU001/document.

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This thesis aims at deciphering the respective roles of autogenic processes and allogenic forcing in the post-orogenic evolution of a coupled mountain catchment/foreland megafan system, with a focus on the Lannemezan megafan and its mountainous catchment in the northern Pyrenees (France). AFT data are consistent with previously published thermochronological data, showing (i) the main exhumation phase of the Axial Zone (AZ; ~50-30 Ma) with lateral variations in the exhumation rates, (ii) a later unroofing of the North-Pyrenean Zone (NPZ; since ~20 Ma), and (iii) a late (~20-15 Ma) exhumation phase only recorded in the western part of the range (west of the Neste River). The megafan was thus built at a late stage of the orogeny and its source catchment lays on the boundary between two tectonic domains. Petrographic data shows that the source area encompasses the NPZ and AZ but modern river sands yield more granitic material than the megafan sediments. This discrepancy suggest that (i) the foreland deposits are locally sourced, but this is not consistent with the definition of a megafan, (ii) the crystalline massifs may have been insufficiently unroofed, but this is inconsistent with the presence of granitic material in Eocene deposits of the south foreland, (iii) the main drainage divide migrated to the south around that period, but this seems inconsistent with the exhumation history of the range as inferred from thermochronological data. Comparison of my estimation of the sedimentary budget and AFT-derived exhumation rates suggests that the current watershed of the Neste is more than sufficient to provide the material for the building of the Lannemezan megafan. This implies that (i) the catchment boundaries have not necessarily changed since the Miocene and (ii) a significant portion of the sediments bypassed the megafan. I dated the abandonment of Quaternary surfaces using cosmogenic nuclides (10Be, 26Al). The abandonment of the megafan (~300 ka) and of the alluvial terraces (~100ka, ~20ka and ~1ka) suggests that incision episodes are triggered by cold-to-warm climatic shifts. The terrace slopes increase with time: I propose that the region was subjected to northward tilting by flexural isostatic rebound as a response to erosional unloading of the range during the Quaternary. From the morphometric analysis (χ-proxy, steepness index, concavity, long river profiles) I show (i) drainage reorganization near the megafan apex and (ii) no influence on the drainage network from active tectonic structures or base-level variations. The abandonment and of the Lannemezan megafan is thus linked to the capture of the Neste by the Garonne and its episodic incision is linked to Quaternary climatic cycles. Numerical modelling adequately reproduce the building of a large megafan in 15 Ma by progradation of the deposits carried by a central river that becomes dominant in the sediment routing. I suggest that, in the northern Pyrenean foreland, the Atlantic Ocean to the west and large, efficient rivers create the conditions needed for a river to be singled out and build a megafan. Negligible subsidence at during the Miocene may have encouraged progradation. I suggest that, in the northern Pyrenees, the main driving force for long-term entrenchment of the megafan is linked to autogenic processes but these are modulated by short-term climatic changes (and possibly isostatic movements). Numerical modelling also evidenced the strong coupling between the mountainous catchment and the basin and the characteristic response times (on the order of 10 ka)<br>Le but de cette thèse est de comprendre ce qui contrôle l’évolution géomorphologique post-orogénique d’un ensemble composé d’un bassin versant montagneux et de son piedmont à partir de l’exemple du méga-cône alluvial de Lannemezan et son bassin versant au flanc nord des Pyrénées. Les données de thermochronologie in-situ et détritiques confirment les phases d’exhumations : (1) une phase d’exhumation majeure (~50-30 Ma), enregistrée dans toute la ZA bien qu’avec des vitesses différentes à l’est (Ariège) qu’à l’ouest, (2) une excavation plus tardive de la ZNP (à partir de ~20 Ma), et (3) une phase tardive d’exhumation (vers 15-20 Ma) enregistrée seulement à l’ouest. Le méga-cône se forme donc à une période post-orogénique où la tectonique cesse de jouer un rôle dominant, mais le bassin versant d’alimentation du cône se situe à une position charnière entre deux zones qui s’exhume différemment. Les données de pétrographie des sédiments indiquent une zone source qui inclut la ZNP et la ZA. La proportion de matériel cristallin dans les sédiments Oligo-Miocène est plus faible que celle des sédiments des rivières actuellesce qui pourrait suggérer que (1) les massifs cristallins n’étaient pas suffisamment exhumés mais cela semble incohérent avec les études précédentes, (2) que la ligne de partage des eaux a migré vers le sud, mais ce n’est pas cohérent avec l’histoire d’exhumation de la chaîne. J’ai comparé le volume érodé dans le bassin pour produire le méga-cône et le flux sédimentaire estimé à partir des taux d’exhumation : il semble que le bassin versant actuel de la Neste est plus que suffisant pour produire les sédiments du cône, ce qui suggère que (1) la taille du bassin versant n’a pas nécessairement changé et (2) une partie des sédiments a été directement exportée vers le bassin marin. Les résultats des datations par nucléides cosmogéniques (10Be et 26Al) suggèrent que le cône est abandonné vers ~300 ka et les terrasses alluviales qui bordent les rivières du piémont (~100ka, ~20ka et ~1ka) pourraient suggérer un contrôle climatique sur l’incision (cycles glaciaires/interglaciaires). Pour expliquer la pente des terrasses je propose l’hypothèse d’un basculement de la région en lien avec un rebond isostatique au Quaternaire. L’analyse morphométrique du réseau de drainage montre (i) une réorganisation par capture dans la partie sud du cône et (ii) qu’il n’y a pas de structure tectonique active ou de variation du niveau marin. J’ai utilisé un modèle numérique pour comprendre les conditions de formation et d’incision d’un méga-cône et comparé les résultats avec les observations faites sur le cône de Lannemezan et son bassin versant. Les résultats suggèrent que le temps de construction d’un tel cône est de l’ordre de 15 Ma, par progradation des dépôts d’une rivière centrale qui domine les apports du piémont. La comparaison avec le cas de Lannemezan suggère que (1) l’Océan Atlantique à l’ouest et les grandes rivières, au transport efficace créent un environnement propice à la formation du méga-cône; (2) la subsidence négligeable du piémont pourrait avoir favorisé la construction du méga-cône; (3) les processus autogéniques sont suffisants pour produire au long terme une incision permanente du cône par sa rivière d’alimentation. Les forçages externes (tectoniques, climat) ne font que moduler l’incision autogénique. La réponse du paysage à un forçage climatique cyclique montre un temps caractéristique de l’ordre de 10 ka. Finalement, la modélisation a permis de mettre en évidence les interactions entre le piémont et la chaîne
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Abrahami, Rachel. "Erosion et flux sédimentaires associés dans un bassin versant soumis à un régime de mousson : l'exemple de la Tista (Inde), du Sikkim au mégafan." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAU031/document.

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L'évolution d'une chaîne de montagne résulte des rétroactions entre le climat et la tectonique via l'érosion. La chaîne Himalayenne, soumise à des processus climatiques et tectoniques très actifs est un chantier d'étude idéal pour comprendre ces interactions. Dans cette étude nous nous sommes intéressés à l'évolution topographique de la région du Sikkim (Inde) ainsi qu'aux processus de formation et de développement du mégafan Quaternaire de la Tista, dépôt fluviatile situés au pieds de ces reliefs. Nos résultats indiquent qu'à l'échelle géologique, les taux d'exhumation (obtenus par les traces de fission sur apatite) les plus forts sont concentrés dans le Sud-Ouest du Sikkim (1.2 ± 0.6 mm/an) suggérant un contrôle tectonique lié à la formation du duplex du Moyen-Pays (« Rangit Duplex »). Les taux d'érosion à l'échelle millénaire (obtenus par 10Be) les plus forts (≈ 5 mm/an) sont enregistrés au niveau de la « Main Central Thrust Zone », mais les zones sources de ces échantillons semblent affectées par des glissements de terrain menant à une surestimation de ces taux. Des taux d'érosion importants sont également enregistrés au Nord du Sikkim (1 à 2 mm/an) et coïncident avec les fortes valeurs de l'indice ksn, localisées au niveau de l'altitude d'avancée maximale des glaciers durant le Dernier Maximum Glaciaire. Nous en concluons que l'érosion millénaire au Sikkim soit en partie liée à l'héritage géomorphologique glaciaire. Le mégafan de la Tista stocke les produits d'érosion du Sikkim et s'étend sur plus de 16 000 km2 depuis le front de la chaîne, où il est fortement incisé, jusqu'à la confluence de la Tista avec le Brahmapoutre. Nous présentons un scénario de développement du mégafan avec le développement successifs de deux lobes distaux en aval d'un lobe proximal commun, développé au front de la chaine depuis au moins 50 000 ans et incisé par la Tista depuis 4000+600/-400 ans. Le lobe distal occidental a été formé tôt dans l'histoire du mégafan, par des rivières drainant le Sikkim et se jettant dans le Gange, et a été abandonné au début de l'Holocène (10 000 – 11000 ans). Le lobe distal oriental, très peu incisé et plus récent (&lt; 1000 ans), s'est construit quand le réseau de drainage principal du Sikkim a migré vers l'Est grâce à d'importantes avulsions. Les périodes d'aggradation et d'incision des rivières sont compatibles avec un guidage climatique, où les périodes de forte intensité de mousson et de forts flux sédimentaires associés coïncident avec des phases d'aggradation dans l'avant-pays. Les phases initiales et terminales de ces périodes de fortes moussons sont caractérisées par de l'incision dans l'avant pays. En revanche, le rôle de l'activité tectonique sur l'alluvionnement et l'incision du mégafan semble mineur. Les résultats pétrographiques et isotopiques (Sr et Nd) utilisés pour contraindre les sources des sédiments du mégafan indiquent une forte différence avec les sédiments actuellement transportés par la Tista qui pourrait s'expliquer par l'influence de roches sédimentaires téthysiennes crétacés exposées au nord du Sikkim, et actuellement drainées par la Kosi. Cela suggère que cette zone ait été récemment (4000 ans) capturée par la Kosi, provoquant l'incision récente et importante du mégafan, due au rééquilibrage du profil de la Tista. Cette hypothèse préliminaire permettrait d'expliquer également la taille disproportionnée du mégafan comparée à celle de son bassin versant actuel. Par ailleurs, nos résultats montrent que les variations de l'érosion et de l'altération chimique répondent à des variations climatiques globales et régionales. Les périodes de fortes intensités de précipitations de mousson se traduisent au Sikkim par une plus forte pénétration des précipitations dans la haute chaîne et une plus forte altération chimique des silicates. Depuis le dernier maximum glaciaire, la région du Sikkim est caractérisée par une augmentation de l'érosion et de l'altération chimique<br>Understanding the relative strengths of tectonic and climatic forcing, as well as the interactions between these controls, at different spatial and temporal scales is important to understand the evolution of orogenic topography. The Himalayas, subjected to both tectonic and climatic phenomena very active, is one of the most popular sites for the study of these interactions. The focus of this project is to understand (1) the evolution of orogenic topography of Sikkim (India), (2)the processus of formation and development of th quaternary Tista megafan. Our results show that long-term exhumation rates obtained by thermochronology (apatite fission tracks) do not correlate with any geomorphic or climatic parameters. We suggest a tectonic control where high rates in southwest Sikkim (1.2±0.6 mm/yr) may be linked to the building of the lesser Himalaya Rangit Duplex. The highest erosion rates recorded at millennial timescales (10Be ∼5 mm/yr) occur in catchments spanning the Main Central Thrust Zone but appear to be strongly influenced by recent landsliding. High erosion rates (1-2 mm/yr) also occur in north Sikkim and may be linked to a strong glacial inheritance on the landscape, as attested by high channel-steepness values close to the maximum extent of glaciers during the Last Glacial Maximum. In contrast, variations in precipitation rate do not seem to strongly influence either short-term erosion or long-term exhumation rates in Sikkim. The Tista megafan spreads over more than 16 000 km2 form the mountain front, where it is strongly incised, to the confluence of the Tista River with the Brahmaputra River, and stores sediments produced in the Sikkim Himalaya. We propose a scenario for the formation and abandonment of the Tista megafan based on new Infra-Red Stimulated Luminescence (IRSL) and 10Be cosmogenic age constraints. We suggest that two distal lobes developed successively downstream from a common proximal lobe. Deposition took place since ~50 ka assuming a constant sedimentation rate of 0.88±0.10 mm.yr-1 and incision began at 〖4.0〗_(-0.4)^(+0.6) ka at an average rate of 〖10.5〗_(-1.8)^(+0.6) mm yr-1. The western distal lobe of the megafan was deposited early in the history of the megafan, possibly when the Sikkim Himalaya catchments were drained by rivers that where tributaries of the Ganga River, and was abandoned in the early Holocene (10-11 ka). The eastern poorly incised and recent (&lt;1ka) may have been built when the main Tista drainage system had shifted eastward through possible nodal avulsions. Tectonic processes seem to play a minor role in guiding the Tista River course and driving incision of the megafan deposits. Abandonment and incision of megafan surfaces and hinterland terraces appears associated to both the onset and the ending of phases of strong monsoon precipitation, during which the balance between water and sediment discharge changes rapidly. Petrographic ans isotopic (Nd and Sr) used to constrain sources of the megafan deposits display a significant difference with sediments actually transported by the Tista River, which could be explained by the influenced of tethyan sedimentary rocks exposed North to Sikkim, and actually drained by the Kosi River. This suggests that this area has been recently (4000 years) captured by the Kosi River, inducing a recent and important incision of the megafan in its proximal part due to the balancing of the river profile. This preliminary hypothesis could also explain the higher size of the megafan comparing to the one of its catchment. Otherwise, our results show that the variations of erosion and chemical alteration respond to global and regional climatic variations. Periods of strong summer monsoon and heavy rainfall are traduced in Sikkim by the more penetration of precipitation into the relief and a strong chemical weathering. Since the Last Glacial maximum, the Sikkim Himalaya is characterised by an augmentation of erosion and chemical weathering
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Hannula, A. (Anu). "En studie om hur funktionell inlärning beaktas i lågstadieläroboken Megafon 1." Bachelor's thesis, University of Oulu, 2019. http://jultika.oulu.fi/Record/nbnfioulu-201904251536.

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Books on the topic "Megafan"

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ill, Luc Gia Cam, ed. MegaMan NT warrior. Viz Media, 2007.

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Cam, Luc Gia, ed. MegaMan NT warrior. Viz Media, 2006.

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1957-, Leach Gary, and Luc Gia Cam, eds. MegaMan NT warrior. Viz, 2004.

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Takamisaki, Ryo. MegaMan NT warrior. Viz, 2005.

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1957-, Leach Gary, and Luc Gia Cam, eds. MegaMan NT warrior. Viz, 2004.

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Takamisaki, Ryo. MegaMan NT warrior. Viz Media, 2008.

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ill, Reich Kass, ed. Megabat. Tundra Books, 2018.

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McCann, Jesse Leon. MegaMan NT warrior: Megahandbook. Scholastic, 2006.

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McCann, Jesse Leon. MegaMan NT warrior: Megahandbook. Scholastic, 2006.

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MegaMan NT warrior: Megahandbook. Scholastic, 2006.

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Book chapters on the topic "Megafan"

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Sinha, Rajiv. "The Kosi Megafan: The Best-known Himalayan Megafan." In World Geomorphological Landscapes. Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-017-8029-2_14.

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Wilkinson, M. Justin, Larry G. Marshall, John G. Lundberg, and Mikhail H. Kreslavsky. "Megafan Environments in Northern South America and their Impact on Amazon Neogene Aquatic Ecosystems." In Amazonia: Landscape and Species Evolution. Wiley-Blackwell Publishing Ltd., 2011. http://dx.doi.org/10.1002/9781444306408.ch10.

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Hangay, George, Susan V. Gruner, F. W. Howard, et al. "Megafauna." In Encyclopedia of Entomology. Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-6359-6_1781.

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Eisert, Regina. "Antarctic Megafauna." In Exploring the Last Continent. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-18947-5_13.

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Arnold, Lorna, and Katherine Pyne. "The Megaton Mission." In Britain and the H-Bomb. Palgrave Macmillan UK, 2001. http://dx.doi.org/10.1057/9780230599772_7.

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Nesselrath, Heinz-Günther. "Theognis von Megara." In Kindlers Literatur Lexikon (KLL). J.B. Metzler, 2020. http://dx.doi.org/10.1007/978-3-476-05728-0_22498-1.

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Prado, José Luis, and María Teresa Alberdi. "Horses and Megafauna Extinction." In The Latin American Studies Book Series. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-55877-6_7.

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Herget, Winfried. "Terry, Megan." In Kindlers Literatur Lexikon (KLL). J.B. Metzler, 2020. http://dx.doi.org/10.1007/978-3-476-05728-0_18768-1.

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Wray, Michael L., and Brent G. Wilson. "Megan Martin." In The ID CaseBook. Routledge, 2019. http://dx.doi.org/10.4324/9781315148083-16.

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Nesselrath, Heinz-Günther. "Theognis von Megara: Elegien." In Kindlers Literatur Lexikon (KLL). J.B. Metzler, 2020. http://dx.doi.org/10.1007/978-3-476-05728-0_22499-1.

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Conference papers on the topic "Megafan"

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Domingos Luz, Leandro, Edward Lo, José C. Stevaux, et al. "SEASONAL VARIABILITY OF SEDIMENT TRANSPORT AND PROVENANCE IN THE DISTAL CUIABÁ MEGAFAN, PANTANAL WETLANDS, BRAZIL." In GSA 2020 Connects Online. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020am-356610.

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Lo, Edward L., Michael M. McGlue, Aguinaldo Silva, et al. "THE LIMNOGEOLOGY OF LAKE UBERABA: FLUVIO-LACUSTRINE SEDIMENTARY PROCESSES ALONG THE DISTAL PARAGUAY MEGAFAN (PANTANAL WETLANDS, BRAZIL)." In GSA Annual Meeting in Seattle, Washington, USA - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017am-305918.

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Newman, Stephen D., Gary S. Weissmann, and Louis A. Scuderi. "THE RELATIONSHIP BETWEEN ACTIVE CHANNEL AND CHANNEL BELT WIDTHS AND SINUOSITIES, AND HOW IT CHANGES DOWN A MEGAFAN." In GSA Annual Meeting in Indianapolis, Indiana, USA - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018am-317397.

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Lane*, Tessa I., Rachel A. Nanson, Boyan Vakarelov, Bruce Ainsworth, and Frank Rarity. "Morphology, Sedimentology and Architecture of Megafan-Shoreline Systems: A Case Study of the Mitchell River Delta, Gulf of Carpentaria, Australia." 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/ice2015-2208837.

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Mouchene, Margaux, Peter van der Beek, Frederic Mouthereau, and Julien Carcaillet. "CONTROLS ON THE POST-OROGENIC EVOLUTION OF THE LANNEMEZAN MEGAFAN IN THE NORTHERN PYRENEAN FORELAND: INSIGHTS FROM COSMOGENIC NUCLIDE EXPOSURE DATING, MORPHOMETRIC ANALYSIS AND NUMERICAL MODELING." In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-278110.

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Hutchens, Jason L., and Michael D. Alder. "Introducing MegaHAL." In the Joint Conferences. Association for Computational Linguistics, 1998. http://dx.doi.org/10.3115/1603899.1603945.

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Ramsey, Marc C., and Robert W. Pitz. "Megabar cavitation collapse." In 2012 IEEE 39th International Conference on Plasma Sciences (ICOPS). IEEE, 2012. http://dx.doi.org/10.1109/plasma.2012.6383511.

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Carbone, Joseph, Jeffrey J. Zarnowski, Matthew A. Pace, Steven Czebiniak, and Richard Carta, Sr. "Megarad and scientific CIDs." In Electronic Imaging: Science & Technology, edited by Constantine N. Anagnostopoulos, Morley M. Blouke, and Michael P. Lesser. SPIE, 1996. http://dx.doi.org/10.1117/12.236115.

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Wilkinson, M. Justin. "MEGAFANS—SOME NEW PERSPECTIVES FROM A GLOBAL STUDY." In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-287880.

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Carrasco, E., E. Sánchez-Blanco, M. L. García-Vargas, et al. "MEGARA spectrograph optics." In SPIE Astronomical Telescopes + Instrumentation, edited by Ian S. McLean, Suzanne K. Ramsay, and Hideki Takami. SPIE, 2012. http://dx.doi.org/10.1117/12.926694.

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Reports on the topic "Megafan"

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Bolton, T. E. Ordovician megafauna, southern Baffin Island, Nunavut. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2000. http://dx.doi.org/10.4095/211846.

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Wong, Ho-Lun. Megalin-Mediated Oligonucleotide Trafficking for Breast Cancer Chemosensitization. Defense Technical Information Center, 2010. http://dx.doi.org/10.21236/ada542623.

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Weir, S. T., W. J. Nellis, and A. C. Mitchell. Electrical conductivity of hydrogen shocked to megabar pressures. Office of Scientific and Technical Information (OSTI), 1993. http://dx.doi.org/10.2172/10179599.

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4

Esquibel, Brian. 2019 Megasun Illumination System Modifications and Operating Procedure Updates. Office of Scientific and Technical Information (OSTI), 2021. http://dx.doi.org/10.2172/1774390.

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Ruoff, A. L. Studies of the III-V compounds in the megabar regime. Office of Scientific and Technical Information (OSTI), 1992. http://dx.doi.org/10.2172/7111464.

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Lee, Maxwell. Peer Review of Megan Splettstoesser by Maxwell Lee. Office of Scientific and Technical Information (OSTI), 2015. http://dx.doi.org/10.2172/1213148.

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Slough, John. Inductively Driven, 3D Liner Compression of a Magnetized Plasma to Megabar Energy Densities. Office of Scientific and Technical Information (OSTI), 2015. http://dx.doi.org/10.2172/1172154.

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Lorenzana, H. E., C. S. Yoo, M. Lipp, T. III Barbee, A. K. McMahan, and C. Mailhiot. Novel high energy density materials: Synthesis by megabar hot pressing. LDRD final report. Office of Scientific and Technical Information (OSTI), 1996. http://dx.doi.org/10.2172/231384.

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Ruoff, A. L. Studies of the III-V compounds in the megabar regime. Technical progress report. Office of Scientific and Technical Information (OSTI), 1992. http://dx.doi.org/10.2172/10169845.

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Gilmour, Daniel. Chronology and Ecology of Late Pleistocene Megafauna in the Northern Willamette Valley, Oregon. Portland State University Library, 2000. http://dx.doi.org/10.15760/etd.416.

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