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Bibliografias temáticas / Braided fluvial

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Literatura científica selecionada sobre o tema "Braided fluvial"

Autor: Grafiati

Publicado: 21 de dezembro de 2024

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Artigos de revistas sobre o assunto "Braided fluvial"

1

Wang, H., e X. Jia. "Selective deposition response to aeolian-fluvial sediment supply in the desert braided channel of the Upper Yellow River, China". Natural Hazards and Earth System Sciences Discussions 3, n.º 2 (10 de fevereiro de 2015): 1269–90. http://dx.doi.org/10.5194/nhessd-3-1269-2015.

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Abstract. Rivers flow across aeolian dunes and develop braided stream channels. Both aeolian and fluvial sediment supplies regulate sediment transport and deposition in such a cross-dune braided river. Here we show a significant selective deposition in response to both aeolian and fluvial sediment supplies in the Ulan Buh desert braided channel. This selective deposition developed by the interaction between the flows and the Aeolian-fluvial sediment supplies, making the coarser sediments (> 0.08 mm) from aeolian sand supply and bank erosion to accumulate in the channel center and the finer fluvial sediments (< 0.08 mm) to be deposited on the bar and floodplain surfaces and forming a coarser-grained thalweg bed bounded by finer-grained floodplain surfaces. This lateral selective deposition reduces the downstream sediment transport and is a primary reason for the formation of "above-ground river" in the braided reach of the Upper Yellow River in response to aeolian and fluvial sediment supplies.

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Wang, H., X. Jia, Y. Li e W. Peng. "Selective deposition response to aeolian–fluvial sediment supply in the desert braided channel of the upper Yellow River, China". Natural Hazards and Earth System Sciences 15, n.º 9 (2 de setembro de 2015): 1955–62. http://dx.doi.org/10.5194/nhess-15-1955-2015.

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Abstract. Rivers flow across aeolian dunes and develop braided stream channels. Both aeolian and fluvial sediment supplies regulate sediment transport and deposition in such cross-dune braided rivers. Here we show a significant selective deposition in response to both aeolian and fluvial sediment supplies in the Ulan Buh desert braided channel. The Ulan Buh desert is the main coarse sediment source for this desert braided channel, and the mean percentage of the coarser (> 0.08 mm) grains on the aeolian dunes surface is 95.34 %. The lateral selective deposition process is developed by the interaction between the flows and the aeolian–fluvial sediment supplies, causing the coarser sediments (> 0.08 mm) from aeolian sand supply and bank erosion to accumulate in the channel centre and the finer fluvial sediments (< 0.08 mm) to be deposited on the bar and floodplain surfaces, forming a coarser-grained thalweg bed bounded by finer-grained floodplain surfaces. This lateral selective deposition reduces the downstream sediment transport and is a primary reason for the formation of an "above-ground" river in the braided reach of the upper Yellow River in response to aeolian and fluvial sediment supplies.

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Sigdel, Ashok, e Tetsuya Sakai. "Sedimentary facies analysis of the fluvial systems in the Siwalik Group, Karnali River section, Nepal Himalaya, and their significance for understanding the paleoclimate and Himalayan tectonics". Journal of Nepal Geological Society 51 (31 de dezembro de 2016): 11–26. http://dx.doi.org/10.3126/jngs.v51i0.24084.

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Fluvial sediments of the Siwalik successions in the Himalayan Foreland Basin are one of the most important continental archives for the history of Himalayan tectonics and climate change during the Miocene Period. This study reanalyzes the fluvial facies of the Siwalik Group along the Karnali River, where the large paleo-Karnali River system is presumed to have flowed. The reinterpreted fluvial system comprises fine-grained meandering river (FA1), flood-flow dominated meandering river with intermittent appearance of braided rivers (FA2), deep and shallow sandy braided rivers (FA3, FA4) to gravelly braided river (FA5) and finally debris-flow dominated braided river (FA6) facies associations, in ascending order. Previous work identified sandy flood-flow dominated meandering and anastomosed systems, but this study reinterprets these systems as a flood-flow dominated meandering river system with intermittent appearance of braided rivers, and a shallow sandy braided system, respectively. The order of the appearance of fluvial depositional systems in the Karnali River section is similar to those of other Siwalik sections, but the timing of the fluvial facies changes differs. The earlier appearance (3-4 Ma) of the flood-flow dominated meandering river system in the Karnali River section at about 13.5 Ma may have been due to early uplift of the larger catchment size of the paleo-Karnali River which may have changed the precipitation pattern i.e. intensification of the Indian Summer Monsoon. The change from a meandering river system to a braided river system is also recorded 1 to 3 Ma earlier than in other Siwalik sections in Nepal. Differential and diachronous activities of the thrust systems could be linked to change in catchment area as well as diachronous uplift and climate, the combination of which are major probable causes of this diachronity.

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Lu, Zhiyuan, Zhiliang He, Shizhong Ma e Yu He. "Sedimentary characteristics and sand-body distributions in the Lower Permian He 8 Member, Ordos Basin, China". Interpretation 10, n.º 2 (22 de fevereiro de 2022): T223—T236. http://dx.doi.org/10.1190/int-2021-0101.1.

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The Lower Permian He 8 Member (P1h8) in the Ordos Basin is a typical producing zone of tight lithologic gas reservoirs. Analyses of sedimentary characteristics, electrofacies, and sand-body distributions of P1h8, conducted on modern fluvial deposits, outcrops, cores, and well logs, revealed that braided rivers that developed in the Lower P1h8 and Upper P1h8 are characterized by meandering river. Within these fluvial deposits, the procedure consists of analyzing high-resolution sequence stratigraphy and sedimentary dynamics defined from calibrated logging curve signatures and depositional studies. According to modern and ancient fluvial deposits, we have developed a process-based sedimentary conceptual model for interpreting and predicting the distribution and geometries of sand bodies in braided and meandering deposits. The main sand body of the braided river system was bars and channel fill deposits. The braided river sand bodies are distributed over multiple vertical superimpositions and overlapping horizontal connections. The meandering river sand bodies are mainly point-bar deposits, which are bead-shaped and exhibit scattered development in the vertical direction. This comparison indicates that there were significant differences between braided and meandering deposystems. The sand bodies in the Lower P1h8 were multidirectionally connected and primarily distributed in a stacked pattern. In contrast, the sand bodies in the Upper P1h8 were distributed in an isolated manner, and fine grains (mud and silt) were deposited between the sand bodies with poor connectivity. We interpreted the fluvial deposits that control the distributions of the sand body of the He8 Member in the eastern Sulige gas field and constructed a corresponding prediction model of a braided-meandering reservoir. This model will promote understanding of the extent of fluvial deposits and sand-body distribution of P1h8, thus elucidating hydrocarbon-bearing sand units of the Ordos Basin for future exploration.

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Ju, Xiaoyu, Xiaodong Zhao, Boyu Zhou, Ruixue Zhang, Xinyu Wu e Dafa Guo. "Identification of Reservoir Water-Flooding Degrees via Core Sizes Based on a Drip Experiment of the Zhenwu Area in Gaoyou Sag, China". Energies 16, n.º 2 (4 de janeiro de 2023): 608. http://dx.doi.org/10.3390/en16020608.

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In order to identify the degree of water flooding in a reservoir and to discover any remaining oil-enriched areas, in this paper, a systematic study on the water flooding of cores in obturated coring wells is carried out. With observations and testing data of the cores, based on the notion of sedimentary facies, the water-flooding degrees of 4–7 sand groups in member one of the Paleogene Sanduo Formation (E2s14–7) of the Zhenwu area in the Gaoyou Sag are determined. Overall, the results show that the study area is formed under the background of lake regression, with various sedimentary systems, mainly including delta facies, braided fluvial facies, and meandering fluvial facies. The degree of water flooding is determined using a point-by-point drip experiment of the core. Combined with the testing results of the core, the water-flooding degrees of the different sedimentary facies are quantitatively determined. Identification standards for the water-flooding degree of delta facies, braided river facies, and meandering river facies are established. The water-flooding degree of the delta sand body is generally weak, with an oil saturation rate of 24.1–40.2%, essentially indicating no water flooding or weak water flooding. The water-flooding degree of the braided fluvial sand body significantly changes, and the variation range of the oil and water saturation measurement results is also large. The water-flooding degree of the meandering fluvial sand body is weaker than that of the braided fluvial sand body, which is mostly not flooded or weakly flooded. The water-flooding degree is obviously controlled by the sedimentary rhythm and the sedimentary type. The top of the positive rhythm, the bottom of the sludge bed in the braided fluvial point bar, the deltaic front subaqueous distributary channel, and the point bar in the meandering fluvial have relatively low water-flooding degrees. They are the subjects of subsequent development adjustment and the remaining oil potential tapping.

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Zawri, Nurul Fahana, Abdul Hadi Abd Rahman, Numair Ahmed Siddiqui e Norizam Md Nor. "Geomorphological evolution of the Group I fluvial system, AX field, Malay Basin". IOP Conference Series: Earth and Environmental Science 1003, n.º 1 (1 de abril de 2022): 012009. http://dx.doi.org/10.1088/1755-1315/1003/1/012009.

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Abstract The AX Field is located 167km off NNE Kerteh, Terengganu of Peninsular Malaysia, southwest of Malay Basin. This study is focused on the 3D seismic analysis of the Lower Miocene fluvio-deltaic Group I. The objective of the study is to evaluate the geomorphological evolution of fluvial succession and interpret the possible intra-basinal and extra-basinal controls on the fluvial evolution. One hundred strata slices were generated in order to evaluate the evolution of the fluvial systems within the Group I interval. Seismic attributes such as Root Mean Square (RMS), sweetness and spectral decomposition were computed to map channel geomorphology. Different fluvial styles were identified in the different parts of the study area. Variation of fluvial style were identified within the Group I interval including the low sinuosity system with tributary channels, high sinuosity system with broad meander belt and braided system. Fluvial channel imaged within the studied interval can be divided into six (6) stages based on the channel morphology. Stage 1 (1875 – 1810 ms), the oldest stage, displays high sinuosity channels. Braided system associated with coal deposition were imaged in Stage 2 (1810 – 1765 ms). During stage 3 (1765 – 1710 ms), the fluvial system is characterized by low to moderate sinuosity channel features that varies in scale and geometry. Stage 4 (1710 – 1675 ms) display fluvial style characterized by low sinuosity-to-straight system with tributary channels. Stage 5 (1675 – 1615 ms) is represented by high sinuosity fluvial system with broad meander belt and point bar. During Stage 6 (1615-1536 ms) the fluvial system displays moderate-to-high sinuosity. The high sinuosity system in period 6 exhibit well-defined meander scroll bar morphology that reveals the extension and translation course of the fluvial system.

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Sun, Yu, Xiu Li Zhang, Jin Yan Zhang e Chen Chen. "Analysis on Grain-Size Characteristics and Sedimentary Environment of Conglomerate Reservoirs in Ying-4 Section of Xingcheng Gas Field of Songliao Basin". Advanced Materials Research 734-737 (agosto de 2013): 286–89. http://dx.doi.org/10.4028/www.scientific.net/amr.734-737.286.

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Aimed at difficulty of conglomerate in Ying-4 Section of Xingcheng Gas Field, Songliao Basin, which it is impossible to be carried out, using routine granularity analysis methods, and the iconic grain-size analysis is carried out. According to iconic two-dimension grain-size analysis, and contacting to fundamental sedimentary characteristics of conglomerate, sedimentary environment analysis is carried out. It is thought that this area is Shallow gravel-bed braided fluvial fan deltas, to braided fluvial delta transition, which supported an important geological foundation for the next disposition of exploration in Xingcheng Gas Field.

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Liu, Yuming, Luxing Dou, Xiaoxu Ren e Jiagen Hou. "Sedimentary characteristics of muddy deposits in sandy braided fluvial system: A case study from outcrops of the Jurassic Yungang Formation in the Datong Basin, Central China". Interpretation 8, n.º 3 (1 de julho de 2020): SM139—SM149. http://dx.doi.org/10.1190/int-2019-0174.1.

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The sandbodies within braided fluvial deposits are important reservoirs for the oil fields in China, and they usually have complex sedimentary architecture. A lot of research has been concentrated on characterizing the architecture of the sandbodies. Based on the observation that muddy deposits are commonly well preserved in fluvial deposits, we find that understanding the contact relationship between the muddy deposits and surrounding sand bodies can help characterize the depositional process of sandy braided fluvial systems. We have determined the effectiveness of this idea by characterizing a well-exposed outcrop of sandy braided fluvial system in the Datong Basin, Shanxi Province of China. We first define six muddy lithofacies by integrating the thickness of the muddy deposits, the morphology of the muddy deposit, and the lithofacies of surrounding sand deposits. The six muddy lithofacies include floodplain muddy deposits between intermittent channel complex, lateral covering muddy deposits and fall-silt seam muddy deposits between migrated bar complex, muddy gravel deposits in erosional bar complex, and channel-fill muddy deposits and gully-fill muddy deposits in abandoned bar complex. We then analyze the depositional environments according to the defined muddy lithofacies. We finally build the architecture of the outcrops by integrating the lithofacies of sand deposits and evolution of the depositional environments deduced from the muddy lithofacies.

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Cui, Kunning. "Characteristics of sedimentary system evolution and sequence stratigraphy boundary of Denglouku group in Xujiaweizi fault depression, Songliao Basin". IOP Conference Series: Earth and Environmental Science 1087, n.º 1 (1 de outubro de 2022): 012073. http://dx.doi.org/10.1088/1755-1315/1087/1/012073.

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Abstract In the previous studies on this area, the sequence division is relatively rough. This study has improved the precision, and the Denglouku formation is divided into 10 fourth-order sequences, with the thickness of each small layer of about 70-80m. The characteristics of each small sequence boundary are described, and three third-order, four fourth-order sequence flooding surfaces are found. The stratigraphic framework is established. From bottom to top, the base level of all strata shows decline-rise-decline, which means regression-transformation-regression. The Denglouku 1st mainly includes lacustrine and fan delta, the sources of sediments from northeast, northwest, southwest and Southeast directions. In Denglouku 2nd and Denglouku 3rd, braided fluvial delta and intermittent lacustrine are dominant, which were controlled by the sedimentary systems from east, south, north, northeast, southwest, and the northwest. In Denglouku 4th, there is mainly braided fluvial, rarely are lacustrine and braided fluvial delta plain, the main source was from the northeast, and a small amount of source is from the west.

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Candeiro, Carlos Roberto, Rodrigo Pinto De Azevedo e Priscila Maria Da Silva. "PRELIMINARY APPROACH ON DEPOSITIONAL ENVIRONMENTAL OF THE UBERABA FORMATION (UPPER CRETACEOUS), PEIRÓPOLIS SITE, MINAS GERAIS STATE, BRAZIL: AN INTRODUCTION". Caminhos de Geografia 8, n.º 22 (22 de setembro de 2007): 81–85. http://dx.doi.org/10.14393/rcg82215625.

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The Coniacian-Santonian Uberaba Formation of Triângulo Mineiro region hás yielded a important paleofauna from fluvial and associated paleoenvironments. Although poor, fossil content are represented by invertebrates and vertebrates. The paleontological and geological data suggested that Uberaba Formation is characterized by a fluvial of a braided type.

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Mais fontes

Teses / dissertações sobre o assunto "Braided fluvial"

1

Pinisetti, Moe. "Integrated numerical well test modelling in braided fluvial reservoirs". Thesis, Heriot-Watt University, 1999. http://hdl.handle.net/10399/609.

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Salas, Carlos J. "Braided fluvial architecture within a rapidly subsiding basin the Pennsylvanian Cumberland group southwest of Sand River, Nova Scotia". Thesis, University of Ottawa (Canada), 1986. http://hdl.handle.net/10393/5416.

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3

Reis, Adriano Domingos dos. "Análise arquitetural de depósitos fluviais da Formação Guará (Jurássico Superior-Cretáceo Inferior) na borda sudeste da Bacia do Paraná, RS, Brasil". reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2016. http://hdl.handle.net/10183/133638.

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The Guará Formation (Upper Jurassic) crops out in the western portion of Rio Grande do Sul along a track with north-south orientation, of which the northern part essentially consists of fluvial deposits with paleocurrent to southwest. Despite the existence of outcrops with good vertical exposure and high lateral continuity, had not yet been carried out detailed studies of fluvial architecture of this unit. Through facies analysis, with vertical logs and lateral sections data, 9 lithofacies composing 8 architectural elements were described and interpreted. These elements are grouped in sandstone bodies of two fluvial styles: (1) Deep perennial braided rivers – composed by simple and composed downstream-accretion elements, small and large-sized hollows, trough cross-stratified sets and overbank sand and fine facies – and (2) Poorly channelized ephemeral braided rivers - characterized by horizontally stratified sandstones and trough cross-stratified sets. Two or more sandstone bodies of same style amalgamate into 10 to 15 m packages representing time intervals with the domain of a river style. These packages alternate vertically separated by hundreds of meters lateral extent surfaces, reflecting intervals with larger and more continuous water discharge (sandstone bodies of deep perennial rivers) or with high energy episodic discharge (with sandstone bodies of poorly channelized ephemeral rivers). The river systems of the proximal portion of the Guará Formation reflects low frequency discharge variations, controlled by the climate.
A Formação Guará (Jurássico Superior) aflora na porção oeste do Rio Grande do Sul ao longo de uma faixa com orientação norte-sul, sendo a sua porção setentrional constituída essencialmente por depósitos fluviais com paleocorrente para sudoeste. Apesar da existência de afloramentos com boa exposição vertical e uma alta continuidade lateral, não haviam sido realizados até o presente momento estudos detalhados da arquitetura fluvial desta unidade. Por meio da análise de fácies, com a elaboração de perfis verticais e seções laterais, foram descritos e interpretados 9 litofácies que compõem 8 elementos arquiteturais. Estes elementos se agrupam em corpos arenosos de dois estilos fluviais: (1) Rios entrelaçados perenes profundos – compostos por elementos de acresção frontal simples e compostas, hollows de pequeno e grande porte, sets isolados com estratificações cruzadas e fácies arenosas e finas externas aos canais – e (2) Rios entrelaçados efêmeros fracamente canalizados – caracterizados por arenitos horizontalmente estratificados e sets isolados com estratificações cruzadas. Dois ou mais corpos arenosos de mesmo estilo se amalgamam em pacotes de 10 a 15 m que representam intervalos de tempo com o domínio de um estilo fluvial. Estes pacotes se alternam verticalmente separados por superfícies de centenas de metros de extensão lateral, refletindo intervalos com descarga aquosa maior e mais contínua (com corpos arenosos de rios perenes e profundos) ou com descarga episódica e de alta energia (com corpos arenosos de rios efêmeros fracamente canalizados). Os sistemas fluviais da porção proximal da Formação Guará refletem variações de descarga de baixa frequência, de controle climático.

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Picco, Lorenzo. "Long period morphological dynamics in regulated braided gravel-bed rivers: comparison between Piave River (Italy) and Waitaki River (New Zealand)". Doctoral thesis, Università degli studi di Padova, 2010. http://hdl.handle.net/11577/3426981.

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Aim of this research has been to make an analysis of long and medium term morphological dynamics that may affect the regulated gravel-bed braided rivers as the Piave river (Italy) and the Waitaki river (New Zealand). The Piave river (drainage area around 4000km2), is one of the largest rivers in the north-east of Italy, the study reach is, mainly, 37 km long, and represent the intermediate course of the river within the mountain district. In addiction were been study different sub-reaches until a minimum of around 1,5 km long. The Waitaki river (drainage area around 11000 km2), is a large gravel-bed river draining the eastern slope of Southern Alps, South Island, New Zealand, has been analyzed along a 13 km long subreach. The flow regime and the sediment supply of these rivers have been considerably altered by hydroelectric dams, flow diversions and, along the Piave river, gravel mining. In addiction, river dynamics have been affected by the construction of stream-bank protection structures. To document these changes, an historical analysis was performed using aerial photographs, cross section survey data and a LiDAR dataset. Morphological features that were examine included planform configuration, active corridor extension, channel width, channel top depth, flow area, number of channels and bed elevation. Vegetation features that were examine included, instead, areal island cover extension and different vegetation class extension. The results indicate as remarkable changes occurred during the study period. In both river there was a marked tendency to the diminution in the number of channels and in the active corridor extension, just subsequently to the main flood events is possible see an increase in the active corridor extensions. Along the Piave river was possible see a marked tendency to narrowing and channel incision during the last 80 years. The island, along both rivers, tend to encroachment and maturation for many years, occupying the active corridor. The island extension could decrease just after considerably flood events (RI > 10 years) or thanks to many close flood events. Regarding islands, has been possible see their tendency to joining with perifluvial vegetation, in consequence of long no-flood periods.
Obbiettivo della presente ricerca è quello di eseguire un’analisi di lungo e medio periodo sulla dinamica della morfologia fluviale riguardante fiumi a canali intrecciati a fondo ghiaioso, sottoposti a regolazione dei regimi idrici, come il fiume Piave (Italia) e il fiume Waitaki (Nuova Zelanda). Il fiume Piave (area del bacino di circa 4000 km2), è uno dei principali fiumi del nord-est d’Italia; il tratto analizzato ha una lunghezza di circa 37 km e si trova nella parte centrale del bacino montano. Inoltre, sono stati studiati diversi sottotratti fino ad un minimo di 1.5 km di lunghezza. Il fiume Waitaki (area del bacino di circa 11000 km2) è il più importante fiume delle Nuova Zelanda per valori di portata, scorre dal versante est delle Alpi del Sud dell’isola del Sud della Nuova Zelanda; il tratto analizzato ha una lunghezza di circa 13 km. Il regime delle portate e l’apporto di sedimenti di questi due fiumi sono stati considerevolmente alterati dalla presenza di dighe per la produzione di energia idroelettrica e dalla presenza di opere trasversali e di difesa spondale. Per studiare le variazioni che si sono succedute nel tempo si è eseguita una ricostruzione storica con l’ausilio di fotografie aeree, dati storici di rilievi topografici e un set di dati LiDAR. Le caratteristiche che si sono analizzate sono l’estensione dell’alveo attivo, la larghezza massima dei canali, la profondità massima dei canali, l’area bagnata dei canali, il numero di canali e le caratteristiche altimetriche del letto del fiume. Si sono, anche, condotte analisi sulla variazione e la dinamica della vegetazione presente in alveo, attraverso la misurazione dell’area delle isole fluviali e l’estensione delle diverse tipologie di vegetazione presente nell’area perifluviale. I risultati ottenuti indicano come nel corso degli anni considerati vi siano stati delle variazioni considerevoli. In entrambi i fiumi c’è stata una marcata tendenza alla diminuzione dei numeri di canali e dell’estensione de corridoio attivo, solamente a seguito di eventi di piene rilevanti è stato possibile osservare un aumento dell’estensione del corridoio attivo. Lungo il corso del fiume Piave è stato possibile osservare una marcata tendenza all’incisione del canale durante gli ultimi 80 anni. Le isole fluviali tendono a maturare e stabilizzarsi per molti anni, occupando così il corridoio attivo. L’estensione delle isole diminuisce solamente a seguito di eventi di piena con tempi di ritorno marcati (> 10 anni), oppure a seguito di eventi che si succedono frequentemente, anche se di intensità minore. Infine si è potuto notare una tendenza delle isole fluviali a fondersi con la vegetazione perifluviale circostante, limitando ancor più l’estensione del corridoio attivo.

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Bofill, Lucas. "From outcrop to fluid-flow : sedimentary architecture, permeability heterogeneity, and effect of sedimentary facies in fluid-flow modelling : a case study of the middle buntstandstein continental sandstones (lower triassic, eastern France)". Electronic Thesis or Diss., Strasbourg, 2024. http://www.theses.fr/2024STRAH006.

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Au fossé rhénan supérieur, dans l'est de la France, le Buntsandstein du Trias inférieur constitue un important réservoir d'eau souterraine et de saumures géothermiques riches en lithium. L'objectif scientifique de cette étude est de comprendre l'architecture de la Formation du Grès Vosgien inférieur (LGV), Buntsandstein moyen ; comment les processus sédimentologiques, à différentes échelles, génèrent des hétérogénéités significatives de perméabilité ; et l'effet de telles hétérogénéités sur les résultats de la modélisation des flux de fluides. L'étude utilise une caractérisation sédimentologique à haute résolution, par le biais de descriptions de profils verticaux, de modèles numériques d'affleurements et d'analyses pétrographiques. Ensuite, les mesures de perméabilité sont couplées aux données sédimentologiques, afin d'identifier différentes échelles de contrôles sédimentaires sur la distribution de la perméabilité. Enfin, un modèle conceptuel hydrostratigraphique réaliste en 2D est généré comme référence, pour évaluer comment différents scénarios de simplification des hétérogénéités impactent la modélisation des flux de fluides, en ce qui concerne le temps de résidence des particules, la macro-dispersivité et l'anisotropie mise à l'échelle.Les résultats indiquent que 93% du LGV est composé de grès déposés par un système fluvial en tresses, avec des indices suggérant que la variabilité du débit était un facteur de contrôle principal de la distribution des faciès sédimentaires et des hétérogénéités. Le modèle de superposition du LGV révèle des périodes où les processus fluviaux étaient absents, et les processus éoliens dominaient le transport et le dépôt des sédiments, constituant 7% de l'épaisseur totale du LGV. Les dépôts éoliens montrent des indications de la présence persistante d'eau dans le système, soit en raison de la montée de la nappe phréatique, soit de crues éphémères.Dans l'association de faciès des chenaux fluviaux, une relation inverse entre les conditions du régime fluvial et la perméabilité de ses faciès est observée. Dans l'association de faciès déposés par le vent et l'eau (WWL), la distribution de la perméabilité est directement influencée par les conditions climatiques, où des feuilles de sable hybrides à faible perméabilité ont été déposées dans des conditions plus humides, et des dunes éoliennes à haute perméabilité dans des conditions plus arides. Cependant, malgré la haute perméabilité des dunes éoliennes, l'architecture des WWL implique un faible potentiel de connectivité. La compaction est le principal processus influençant la perméabilité et la porosité du LGV. Les échantillons avec une proportion plus élevée de lithoclastes et d'argile infiltrée ont enregistré un degré de compaction plus avancé, tandis que les échantillons avec un pourcentage plus élevé de surcroissance de quartz ont montré un degré de compaction moindre. La surimpression diagénétique a affecté les différents faciès de manière distincte, indiquant que les processus et l'architecture sédimentaires primaires régissent la distribution des hétérogénéités de perméabilité dans le LGV. Les données de perméabilité provenant des affleurements ont montré des valeurs médianes jusqu'à trois ordres de grandeur plus élevées que celles des données de subsurface. Cependant, les mêmes faciès, et des tendances similaires des réponses porosité-perméabilité relatives aux différents faciès, sont observées entre les affleurements et les échantillons de forage, mettant en évidence la sédimentologie comme un proxy indispensable pour les études d'hétérogénéité des réservoirs[...]
At the Upper Rhine Graben, in Eastern France, the Lower Triassic Buntsandstein serves as an important reservoir of groundwater and lithium-rich geothermal brines. The scientific objective of this study is to comprehend the architecture of the Lower Grès Vosgien Formation (LGV), Middle Buntsandstein; how sedimentological processes, at different scales, generate significant permeability heterogeneities; and the effect of such heterogeneity in fluid-flow modelling results. The study employs high-resolution sedimentological characterisation, through vertical profile descriptions, digital outcrop model, and petrographic analysis. Subsequently, permeability measurements are coupled with sedimentological data, to identify different scales of sedimentary controls on permeability distribution. Finally, a realistic 2D hydrostratigraphyc conceptual model is generated as a reference, to evaluate how different scenarios of heterogeneity simplification impact fluid-flow modelling, concerning particle residence time, macro-dispersivity and upscaled anisotropy.Results indicate that 93% of the LGV is composed of sandstones deposited by a braided fluvial system, with evidence suggesting that discharge variability was a main depositional controlling factor of sedimentary facies and heterogeneity distribution. The LGV stacking pattern reveals periods when fluvial processes were absent, and aeolian processes dominated sediment transport and deposition, constituting 7% of the total LGV thickness. The aeolian deposits record indications of persistent water in the system, either due to water table rise or ephemeral floods In the fluvial channel facies association, an inverse relationship between fluvial flow regime conditions and the permeability of its facies is observed. In the wind- and water-laid facies association (WWL), permeability distribution is directly influenced by climatic conditions, where low permeability hybrid sand sheets were deposited in more humid conditions, and high permeability aeolian dunes in more arid conditions. However, despite the high permeability of the AD, the architecture of the WWL implies low connectivity potential. Compaction is the main process influencing the permeability and porosity of the LGV. Samples with a higher proportion of lithoclasts and infiltrated clay recorded a more advanced degree of compaction, whereas samples with a higher percentage of quartz overgrowth exhibited a lower degree of compaction. The diagenetic overprint affected the distinct facies differently, indicating that primary sedimentary processes and architecture govern the distribution of permeability heterogeneity in the LGV. Permeability data from outcrops exhibited median values up to three orders of magnitude higher than those from subsurface data. However, the same facies, and similar trends of relative porosity-permeability responses to the distinct facies, are observed between outcrops and borehole samples, highlighting sedimentology as an indispensable proxy for reservoir heterogeneity studies[...]

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Tacon, Sandrine. "Spatio-temporal analysis of braided river morphology with airborne LiDAR". Thesis, Lyon 2, 2015. http://www.theses.fr/2015LYO20054/document.

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Les rivières en tresses constituent des plaines alluviales complexes constituées d'une mosaïque d'unités correspondant à des échelles spatio-temporelles différentes. L'objectif de cette thèse a été d'utiliser des données de LiDAR aéroporté pour améliorer la connaissance des réponses morphologiques des lits en tresses à différentes échelles spatio-temporelles. Dans un premier temps, 2 levés LiDAR séquentiels ont permis de détecter les changements morphologiques d’une tresse de 7 km survenus suite à une crue de période de retour 14 ans. Ces travaux ont été réalisés sur le site du Bès, un affluent de la Bléone. Les résultats ont mis en évidence l’importance des différentes étapes de traitement de l’information dans le calcul du bilan sédimentaire (réalignement des nuages de points séquentiels, évaluation de la bathymétrie, variabilité spatiale de l’incertitude altimétrique). L’exploitation des résultats a de plus montré un profond remaniement des chenaux tressés, du fait de l’occurrence de nombreuses avulsions. Dans un deuxième temps, les données LiDAR ont été utilisées pour caractériser la signature morphologique des lits en tresses à l’échelle plurikilométrique. L’analyse a porté sur un linéaire de plus de 25 km réparti sur 9 sites, dans les bassins versants de la Drôme, du Drac et de la Bléone. Premièrement, ces données mettent clairement en évidence l’effet du confinement de la tresse sur ses propriétés morphologiques avec entre autres un élargissement de la bande active à l'amont de ces zones. Deuxièmement, deux périodes caractéristiques ont été mises en évidence : autour de 3-4 et de 9-10 fois la largeur de la bande active. La période à 3-4 serait liée à la dynamique des macroformes. La période à 10 pourrait être liée à la dynamique de transfert à long terme des sédiments et pourrait correspondre aux successions longitudinales des mégaformes sédimentaires. Finalement, les données de LIDAR aérien ont été couplées à une étude diachronique de photographies aériennes pour reconstruire l'historique de formation des différentes unités spatiales composant la plaine d'inondation et relier cette structure avec les caractéristiques des unités de végétation. 3 rivières en tresses ont été étudiées dans les Alpes françaises avec un degré croissant d'activité : le Bouinenc, la Drôme et le Bès. Cette méthodologie a permis de reconstruire les différentes phases d'incision du lit avec deux périodes majeurs : avant 1948 et seconde partie du 20ème siècle. Il a aussi été montré l'impact des crues sur l'incision et l'élargissement de la bande active en lien avec le régime sédimentaire. Ces changements à long terme jouent un rôle significatif pour expliquer la mosaïque de la végétation de la plaine d'inondation avec une végétation bien développée et composée majoritairement d'unité matures dans le cas d'une rétraction et d'une incision sur le long terme. Les rivières plus actives présentent une diversité d'unité de végétation plus équilibrée. Enfin, la présence de lande arbustive semble être un bon indicateur des périodes d'incision
Braided rivers form complex floodplains composed of sedimentary deposits mosaics, which differ in term of spatial and time scales, in function of hydrologic forcing and sediment supply. The goal of this thesis is to use airborne LiDAR to improve our understanding of braided channel morphological responses at different spatial and time scales.In a first time, two sequential airborne LiDAR surveys were used to reconstruct morphological changes of a 7-km-long braided river channel following a 14-year return period flood. This was done on the Bès River, a tributary of the Bléone River in southeastern France. Results highlighted the importance of different data processing steps in sediment budget computation (surface matching, bathymetry assessment, spatially distributed propagation of uncertainty). Analysis of these data also shows that the braided channel pattern was highly disturbed by the flood owing to the occurrence of several channel avulsions.In a second time, LiDAR data were used to look at longitudinal signatures of cross-sectional morphology at the scale of several kilometers. This study was done on 9 study reaches distributed on five braided rivers in Drôme, Drac and Bléone catchments. These data highlighted the effect of braided river confinement/obstruction on morphologic signature with upstream widening pattern. Secondly, two characteristic wavelengths have been identified from these signals: 3-4 and 10 times the active channel width. The first could be link to the dynamics of macroforms. The second could be associated to the dynamics of megaforms and long term sediment transfer.Finally, airborne LiDAR data were associated with archived aerial photos to reconstruct floodplain formation and relate this geomorphic organisation with vegetation patch characters. This is achieved on 3 different braided rivers in French Alps with an increasing degree of activity: the Bouinenc Torrent, the Drôme River and the Bès River. This methodology allowed us to establish the timing of channel incision with the identification of two major periods: before 1948 and second part of 20th century. Impacts of flood history on channel incision and widening pattern were also highlighted. These long term changes are playing a significant role to explain vegetation mosaics with a well-developed vegetated floodplain mainly composed of mature units following long term narrowing and incision. Rivers with higher activity show an equi-diversity of floodplain vegetation units. Finally, presence of shrubland patches seems to be good indicator of incision periods

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Krapf, Carmen. "Ephemeral river systems at the Skeleton Coast, NW-Namibia sedimentological and geomorphological studies on the braided river dominated Koigab Fan, the cenozoic succession in the Uniabmond area and comparative studies on fluvio-aeolian interaction between ephemeral rivers and the Skeleton Coast erg /". Doctoral thesis, [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=968609740.

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PICCO, LORENZO. "Long period morphological dynamics in regulated braided gravel-bed rivers: comparison between Piave River (Italy) and Waitaki River (New Zealand)". Doctoral thesis, 2010. http://hdl.handle.net/11577/3033851.

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Obbiettivo della presente ricerca è quello di eseguire un’analisi di lungo e medio periodo sulla dinamica della morfologia fluviale riguardante fiumi a canali intrecciati a fondo ghiaioso, sottoposti a regolazione dei regimi idrici, come il fiume Piave (Italia) e il fiume Waitaki (Nuova Zelanda). Il fiume Piave (area del bacino di circa 4000 km2), è uno dei principali fiumi del nord-est d’Italia; il tratto analizzato ha una lunghezza di circa 37 km e si trova nella parte centrale del bacino montano. Inoltre, sono stati studiati diversi sottotratti fino ad un minimo di 1.5 km di lunghezza. Il fiume Waitaki (area del bacino di circa 11000 km2) è il più importante fiume delle Nuova Zelanda per valori di portata, scorre dal versante est delle Alpi del Sud dell’isola del Sud della Nuova Zelanda; il tratto analizzato ha una lunghezza di circa 13 km. Il regime delle portate e l’apporto di sedimenti di questi due fiumi sono stati considerevolmente alterati dalla presenza di dighe per la produzione di energia idroelettrica e dalla presenza di opere trasversali e di difesa spondale. Per studiare le variazioni che si sono succedute nel tempo si è eseguita una ricostruzione storica con l’ausilio di fotografie aeree, dati storici di rilievi topografici e un set di dati LiDAR. Le caratteristiche che si sono analizzate sono l’estensione dell’alveo attivo, la larghezza massima dei canali, la profondità massima dei canali, l’area bagnata dei canali, il numero di canali e le caratteristiche altimetriche del letto del fiume. Si sono, anche, condotte analisi sulla variazione e la dinamica della vegetazione presente in alveo, attraverso la misurazione dell’area delle isole fluviali e l’estensione delle diverse tipologie di vegetazione presente nell’area perifluviale. I risultati ottenuti indicano come nel corso degli anni considerati vi siano stati delle variazioni considerevoli. In entrambi i fiumi c’è stata una marcata tendenza alla diminuzione dei numeri di canali e dell’estensione de corridoio attivo, solamente a seguito di eventi di piene rilevanti è stato possibile osservare un aumento dell’estensione del corridoio attivo. Lungo il corso del fiume Piave è stato possibile osservare una marcata tendenza all’incisione del canale durante gli ultimi 80 anni. Le isole fluviali tendono a maturare e stabilizzarsi per molti anni, occupando così il corridoio attivo. L’estensione delle isole diminuisce solamente a seguito di eventi di piena con tempi di ritorno marcati (> 10 anni), oppure a seguito di eventi che si succedono frequentemente, anche se di intensità minore. Infine si è potuto notare una tendenza delle isole fluviali a fondersi con la vegetazione perifluviale circostante, limitando ancor più l’estensione del corridoio attivo.

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Krapf, Carmen [Verfasser]. "Ephemeral river systems at the Skeleton Coast, NW-Namibia : sedimentological and geomorphological studies on the braided river dominated Koigab Fan, the cenozoic succession in the Uniabmond area and comparative studies on fluvio-aeolian interaction between ephemeral rivers and the Skeleton Coast erg / vorgelegt von Carmen Krapf". 2003. http://d-nb.info/968609740/34.

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Livros sobre o assunto "Braided fluvial"

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E&G Quaternary Science Journal Vol. 60 No 4: Quaternary landscape evolution in the Peribaltic region. Geozon Science Media, 2011.

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Capítulos de livros sobre o assunto "Braided fluvial"

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Surian, Nicola. "Fluvial Processes in Braided Rivers". In Rivers – Physical, Fluvial and Environmental Processes, 403–25. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-17719-9_15.

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Ashmore, P., e J. T. Gardner. "Unconfined Confluences in Braided Rivers". In River Confluences, Tributaries and the Fluvial Network, 119–47. Chichester, UK: John Wiley & Sons, Ltd, 2008. http://dx.doi.org/10.1002/9780470760383.ch7.

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Gardiner, Scott, David V. Thomas, E. Dale Bowering e Larry S. McMinn. "A Braided Fluvial Reservoir, Peco Field, Alberta, Canada". In Casebooks in Earth Sciences, 31–56. New York, NY: Springer New York, 1990. http://dx.doi.org/10.1007/978-1-4613-8988-0_3.

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Surian, Nicola, e Alessandro Fontana. "The Tagliamento River: The Fluvial Landscape and Long-Term Evolution of a Large Alpine Braided River". In World Geomorphological Landscapes, 157–67. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-26194-2_13.

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Momin, Hassan, e Gorky Chakraborty. "Missing Fluvio-Social Dynamics of a Braided River: A Study on a Select Stretch of the Brahmaputra in Assam". In Indigeneity, Development and Sustainability, 245–74. Singapore: Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-1436-0_12.

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"Braided Fluvial Reservoirs". In Oil Field Production Geology, 273–77. American Association of Petroleum Geologists, 2009. http://dx.doi.org/10.1306/13161222m913372.

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MAIZELS, JUDITH K. "LARGE-SCALE FLOOD DEPOSITS ASSOCIATED WITH THE FORMATION OF COARSE-GRAINED, BRAIDED TERRACE SEQUENCES". In Recent Developments in Fluvial Sedimentology, 135–48. SEPM (Society for Sedimentary Geology), 1987. http://dx.doi.org/10.2110/pec.87.39.0135.

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Mcvey, R., B. Rumsby e J. Brasington. "The potential for high resolution fluvial archives in braided rivers". In River Basin Sediment Systems - Archives of Environmental Change. Taylor & Francis, 2001. http://dx.doi.org/10.1201/9781439824672.ch16.

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KINGSLEY, CHARLES S. "FACIES CHANGES FROM FLUVIAL CONGLOMERATE TO BRAIDED SANDSTONE OF THE EARLY PROTEROZOIC ELDORADO FORMATION, WELKOM GOLDFIELD, SOUTH AFRICA". In Recent Developments in Fluvial Sedimentology, 359–70. SEPM (Society for Sedimentary Geology), 1987. http://dx.doi.org/10.2110/pec.87.39.0359.

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Barineau*, Clinton, e Diana Ortega-Ariza*. "An Upper Cretaceous paleodrainage system on the Coastal Plain unconformity of Alabama-Georgia". In Field Excursions from the 2021 GSA Section Meetings, 35–60. Geological Society of America, 2021. http://dx.doi.org/10.1130/2021.0061(03).

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ABSTRACT Rocks of the Upper Cretaceous Tuscaloosa Formation (Cenomanian) and Eutaw Formation (Santonian) in southwestern Georgia and southeastern Alabama record an interval of fluvial and nearshore marine deposition. In the vicinity of Columbus, Georgia, basal units of the Tuscaloosa Formation consist of a residual paleosol built on crystalline rocks of the Appalachian Piedmont covered by conglomeratic sandstones deposited in braided stream systems flowing across the mid-Cenomanian Coastal Plain unconformity. The unconformity, which separates Cretaceous detrital rocks from underlying metamorphic rocks and residual paleosols built on those metamorphic rocks, lies primarily within the Tuscaloosa Formation in this region and is marked at the modern surface by the geomorphic Fall Line. Mapping of the unconformity across the region reveals areas of significant paleorelief associated with a number of distinct paleovalleys incised into the mid-Cenomanian surface. The most distinct of these lie immediately east of the Alabama-Georgia state line, within 15 km of the modern Lower Chattahoochee River Valley. Spatially, these distinct paleovalleys lie immediately north of a Santonian estuarine environment recorded in the Eutaw Formation, disconformably above the Tuscaloosa Formation. Collectively, paleo-valleys in the mid-Cenomanian surface, the fluvial nature of the Tuscaloosa Formation in southwestern Georgia and southeastern Alabama, and the estuarine environment in the younger Eutaw Formation suggest a persistent (~10 m.y.) paleodrainage system that may be a forerunner to the modern Chattahoochee River.

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Trabalhos de conferências sobre o assunto "Braided fluvial"

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Toro-Rivera, M. L. E., P. W. M. Corbett e George Stewart. "Well Test Interpretation in a Heterogeneous Braided Fluvial Reservoir". In European Petroleum Conference. Society of Petroleum Engineers, 1994. http://dx.doi.org/10.2118/28828-ms.

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Ettema, R., D. Armstrong, C. Thornton, S. Hughes e S. Abt. "Hydraulic modeling of braided channels self-formed in an alluvial plain". In The International Conference On Fluvial Hydraulics (River Flow 2016). Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742: CRC Press, 2016. http://dx.doi.org/10.1201/9781315644479-176.

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Taylor, D., D. Hodgetts, J. Redfern e J. Richardson. "Quantification and Prediction of Braided Fluvial Systems Using Digital Outcrop Models". In 80th EAGE Conference and Exhibition 2018. Netherlands: EAGE Publications BV, 2018. http://dx.doi.org/10.3997/2214-4609.201801689.

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Biswas, Robin, A. Yorozuya e S. Egashira. "Monitoring of sandbars migration process in mega-sized braided river using MODIS". In The International Conference On Fluvial Hydraulics (River Flow 2016). Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742: CRC Press, 2016. http://dx.doi.org/10.1201/9781315644479-99.

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Li, S. L., e X. H. Yu. "The Response of Architectural Elements to Sequence Stratigraphy in Braided Fluvial System". In Saint Petersburg 2012. Netherlands: EAGE Publications BV, 2012. http://dx.doi.org/10.3997/2214-4609.20143720.

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Unsworth, C., A. Nicholas, P. Ashworth, C. Simpson, J. Best, S. Lane, D. Parsons e G. Sambrook. "Using bedform migration and orientation to infer sediment transport pathways in a sandy braided river". In The International Conference On Fluvial Hydraulics (River Flow 2016). Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742: CRC Press, 2016. http://dx.doi.org/10.1201/9781315644479-180.

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Becker, Mauro R., Larry W. Lake e Noel Tyler. "Fractal Properties of Braided Fluvial Deposits for Characterization and Simulation of Reservoir Heterogeneity". In Latin American and Caribbean Petroleum Engineering Conference. Society of Petroleum Engineers, 1997. http://dx.doi.org/10.2118/38951-ms.

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Labourdette, R., e R. Jones. "Characterisation of Fluvial Architectural Elements Using a Three Dimensional Outcrop Dataset – Escanilla Braided System". In 69th EAGE Conference and Exhibition incorporating SPE EUROPEC 2007. European Association of Geoscientists & Engineers, 2007. http://dx.doi.org/10.3997/2214-4609.201401722.

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Davies, D. K., B. P. J. Williams e R. K. Vessell. "Models for Meandering and Braided Fluvial Reservoirs With Examples From the Travis Peak Formation, East Texas". In SPE Annual Technical Conference and Exhibition. Society of Petroleum Engineers, 1992. http://dx.doi.org/10.2118/24692-ms.

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Zhongbo, Xu, Huang Kai, Shen Chunsheng, Luo Xianbo, He Bin, Kang Kai, Chen Yukun et al. "Architecture Characterization of Sandy Braided Fluvial Reservoir: A Case Study of P Oilfield (Neogene), Bohai Offshore, China". In SPE Annual Technical Conference and Exhibition. Society of Petroleum Engineers, 2015. http://dx.doi.org/10.2118/174886-ms.

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Relatórios de organizações sobre o assunto "Braided fluvial"

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Devaney, J. R., e P. W. Fralick. Regional sedimentology of the Namewaminikan group, northern Ontario: archean fluvial fans, braided rivers, deltas, and an aquabasin. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1985. http://dx.doi.org/10.4095/120237.

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