Relevant bibliographies by topics / Fluvial sediments

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Academic literature on the topic 'Fluvial sediments'

Author: Grafiati
Published: 4 June 2021
Last updated: 27 April 2022

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Journal articles on the topic "Fluvial sediments"

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Rosales-Hoz, L., A. Carranza-Edwards, C. Mendez-Jaime, and M. A. Monreal-Gómez. "Metals in shelf sediments and their association with continental discharges in a tropical zone." Marine and Freshwater Research 50, no. 3 (1999): 189. http://dx.doi.org/10.1071/mf98107.

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Geochemical studies of shelf sediments of the south-eastern Gulf of Mexico were carried out to understand the influence of fluvial and fluvio–lagoonal discharges on sediment geochemistry and to study elemental distribution patterns that could be used together with hydrographic and sedimentological data to assess depth circulation. On the basis of sediment chemical composition, three provinces were identified: fluvial, fluvio–lagoonal and calcareous; their distribution is a function of circulation patterns and fluvio and fluvio–lagoonal discharges. Factor analysis separated the sediments into three groups: fluvial influence, anthropic activities and fluvio–lagoonal origin.
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Woronko, Barbara, Paweł Zieliński, and Robert Jan Sokołowski. "Climate evolution during the Pleniglacial and Late Glacial as recorded in quartz grain morphoscopy of fluvial to aeolian successions of the European Sand Belt." Geologos 21, no. 2 (June 1, 2015): 89–103. http://dx.doi.org/10.1515/logos-2015-0005.

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Abstract We present results of research into fluvial to aeolian successions at four sites in the foreland of the Last Glacial Maximum, i.e., the central part of the “European Sand Belt”. These sites include dune fields on higher-lying river terraces and alluvial fans. Sediments were subjected to detailed lithofacies analyses and sampling for morphoscopic assessment of quartz grains. Based on these results, three units were identified in the sedimentary succession: fluvial, fluvio-aeolian and aeolian. Material with traces of aeolian origin predominate in these sediments and this enabled conclusions on the activity of aeolian processes during the Pleniglacial and Late Glacial, and the source of sediment supply to be drawn. Aeolian processes played a major role in the deposition of the lower portions of the fluvial and fluvio-aeolian units. Aeolian material in the fluvial unit stems from aeolian accumulation of fluvial sediments within the valley as well as particles transported by wind from beyond the valley. The fluvio-aeolian unit is composed mainly of fluvial sediments that were subject to multiple redeposition, and long-term, intensive processing in an aeolian environment. In spite of the asynchronous onset of deposition of the fluvio-aeolian unit, it is characterised by the greatest homogeneity of structural and textural characteristics. Although the aeolian unit was laid down simultaneously, it is typified by the widest range of variation in quartz morphoscopic traits. It reflects local factors, mainly the origin of the source material, rather than climate. The duration of dune-formation processes was too short to be reflected in the morphoscopy of quartz grains.
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Marinho, Rogério Ribeiro, Antonio Fábio Sabbá Guimarães Vieira, and Feliciano De Souza Maciel. "Análise Montante-Jusante da Granulometria dos Sedimentos de Fundo e Suspenso do Rio Negro e Tributários (Bacia Amazônica, Brasil)." Revista Brasileira de Geografia Física 14, no. 2 (April 14, 2021): 997. http://dx.doi.org/10.26848/rbgf.v14.2.p997-1008.

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O conhecimento das características físicas de sedimentos transportados por grandes sistemas fluviais possui significativa importância para o entendimento de processos geomorfológicos e hidrológicos. O nível de conhecimento dos grandes sistemas fluviais da Amazônia e sua relação com o transporte de sedimentos ainda é limitado, resultando em lacunas de conhecimento sobre a dinâmica da paisagem nesta complexa região. Este trabalho teve como objetivo avaliar a distribuição espacial da granulometria de sedimentos de fundo e suspenso do Rio Negro e tributários. Realizou-se análise da distribuição do tamanho dos sedimentos em seções amostrais localizadas no alto, médio e baixo curso do Rio Negro. Os resultados da análise granulométrica da carga de fundo indicam a predominância de sedimentos com tamanho variando de 0,25 a 1,0 mm (principalmente areia fina, areia média e areia grossa) enquanto no baixo curso as amostram oscilaram de areia fina a partículas lamosas (< 0,50 mm). No Rio Negro os sedimentos suspensos são compostos principalmente de partículas finas de silte (90% menor que 80 µm) com diâmetro mediano (D50) de 25 µm. As características granulométricas apresentadas neste trabalho fornecem subsídios para o entendimento de processos hidrodinâmicos de transporte e deposição dos sedimentos de fundo e suspenso neste gigante sistema fluvial. Upstream-downstream Granulometry Analysis of bed and suspended sediments in the Negro River Basin (Amazon Basin, Brazil)A B S T R A C TThe knowledge of the physical characteristics of sediments transported by large river systems has significant importance for the understanding of geomorphological and hydrological processes. The level of knowledge of the large rivers of the Amazon basin and their relationship with sediment transport is limited, resulting in gaps about the dynamics of the landscape in this complex region. This article analyzes the spatial distribution of granulometry of bed and suspended sediments in the Negro River and tributaries. An analysis of the sediment size distribution was carried out in sample sections located in the upper, middle and lower reaches of the Negro River. The results of the granulometric analysis of the bed load indicate the predominance of sediments with sizes ranging from 0.25 to 1.0 mm (mainly fine sand, medium sand and coarse sand) while in the low course they showed oscillated from fine sand to muddy particles (<0.50 mm). In the Negro River basin the suspended sediments are composed mainly of fine silt particles (90% less than 80 µm) with a median diameter (D50) of 25 µm. The granulometric characteristics presented in this work provide subsidies for the understanding of hydrodynamic processes of transport and deposition of bed and suspended sediments in this huge fluvial system.Keywords: sediment transport, Amazon floodplain, multichannel river, anabranching
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Sawakuchi, André Oliveira, Vinicius Ribau Mendes, Fabiano do Nascimento Pupim, Thays Desiree Mineli, Ligia Maria Almeida Leite Ribeiro, Andre Zular, Carlos Conforti Ferreira Guedes, et al. "Optically stimulated luminescence and isothermal thermoluminescence dating of high sensitivity and well bleached quartz from Brazilian sediments: from Late Holocene to beyond the Quaternary?" Brazilian Journal of Geology 46, suppl 1 (June 2016): 209–26. http://dx.doi.org/10.1590/2317-488920160030295.

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ABSTRACT: The development of optically stimulated luminescence (OSL) dating of sediments has led to considerable advance in the geochronology of the Quaternary. OSL dating is a well established technique to determine sediment burial ages from tens of years to few hundred thousand years. Recent studies have shown that Quaternary sediments of Brazil are dominated by quartz grains with high luminescence sensitivity, allowing the determination of precise and reliable OSL burial ages. In this paper, we show examples of OSL dating of quartz aliquots and single grains from different regions in Brazil, including young coastal-eolian Late Holocene (< 100 years) to Late Pleistocene (~ 150 ka) fluvial sediments. We discuss the OSL data and ages of sediments from carbonate and terrigenous (distributary and tributary systems) fluvial depositional contexts in Brazil. Most of the studied fluvial sediments show equivalent dose distributions with low to moderate dispersion, suggesting well bleached sediments. The comparison between aliquot and single grain data suggests that high overdispersion in equivalent dose distributions of some samples is more related with sediment mixture due to bioturbation than with incomplete bleaching during transport. Well bleached fluvial sediments contrast with the poor bleached pattern usually described for fluvial sediments in the literature. A large part of the fluvial sedimentary record in Brazil is older than the age limit for quartz OSL dating using blue light stimulation. Thus, isothermal thermoluminescence (ITL) dating protocols were tested for dating of fluvial sands from the Xingu River (eastern Amazonia). The studied sample can recover reliable equivalent doses up to 1600 Gy using the ITL 310oC signal. Therefore, this signal would be suitable to extend the age limit of quartz luminescence to the whole Quaternary or beyond (> 2 Ma) in the low dose rate (0.5 - 1.0 Gy/ka) environments typical for Brazilian sediments.
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Wang, H., and 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, no. 2 (February 10, 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, and 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, no. 9 (September 2, 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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Halifa-Marín, A., P. Pérez-Cutillas, M. Almagro, and C. Boix-Fayos. "Presión antrópica sobre cuencas de drenaje en ecosistemas frágiles: variaciones en las existencias (stock) de carbono orgánico asociadas a cambios morfológicos fluviales." Cuadernos de Investigación Geográfica 45, no. 1 (June 18, 2019): 245. http://dx.doi.org/10.18172/cig.3690.

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Anthropic changes in the drainage area of catchments can influence dominant erosion processes and sediment sources and mobilize specific carbon pools. It also causes changes in the sedimentary dynamics and thus in the fluvial morphology. At the same time fluvial morphologies can create the conditions for stabilizing organic carbon (OC) in sediments by burial, carbon preservation, slowing down mineralization processes, and terrestrial or aquatic plant colonization. All this might have a significant impact on the fluvial carbon sink or sources. This work explores the impact of changes in the drainage area (reforestation, check-dam building, agricultural abandonment) on fluvial morphology and on the sedimentary carbon sink of an arid and erodible catchment. The methodological approach combines cartographic analysis of land use, geomorphological photointerpretation of the channel and slope-channel connections in 1956 and 2016. Furthermore, soil and sediment sampling across the catchment for organic carbon stock determination was carried out. The watershed underwent a drastic transformation of land use from 1956, changing from an agrarian scenario to a forest pattern in 2016. This evolution altered sedimentological dynamics and fluvial morphologies. The active channel was narrowed (52%) whereas bank erosion (77%) and the adjacent gullies (11%) increased. The inner alluvial plain increased up to 31% and alluvial fans up to 37%. In addition, vegetation in the channel increased up to 16%. All this led to an increase of the total OC pool of fluvial sediments (12%), slightly above than the increase of OC total pool in the soils of the catchment (10%). The ratio of the OC stock sediments/soils was > 0.8, which indicates the large capacity of carbon sequestration of fluvial sediments, with OC stocks larger than those of agricultural soils. It was found that the geomorphological dynamics plays an important role in the OC fluvial flows. In scenarios of channel narrowing and vegetation encroachment of fluvial morphologies, the sediments can stabilize and generate OC sinks. These processes of OC sequestration in dry and ephemeral channels can have a large relevance for various ecosystem services and should be considered in the management of fluvial sedimentary areas.
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Galia, Tomáš, and Václav Škarpich. "Coarse Bed Sediments in a Headwater Channel as Indicators of Fluvial Processes and Slope-Channel Coupling: A Case Study from the Carpathian Mountains (Czech Republic)." Moravian Geographical Reports 21, no. 3 (September 1, 2013): 2–11. http://dx.doi.org/10.2478/mgr-2013-0012.

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Abstract The character of riverbed sediments usually reflects fluvial processes and the dynamics of sediment transport in fluvial systems. The approach in this study was based on the measurement of the largest boulders located within a bankfull channel, and on the observation of changes in their size in the longitudinal profile of a headwater stream in the Moravian-Silesian Beskids Mountains. The resulting trends in a particle-size index reflect the character of sediment delivery into channel segments and the recent channel-forming processes. The largest boulders were observed in channel sections with a strong interaction of slope and fluvial processes, and a slight coarsening of sediments was recorded in the incised downstream sections of the longitudinal stream profile. In contrast, the refining of bed sediments was typical of the transitional zone between slope-channel coupled reaches and an alluvial cone characterised by a tendency to material aggradation.
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Aleixo, Yan De Mello, Márcio Henrique De Campos Zancopé, and Luis Felipe Soares Cherem. "O Papel do Perfil Longitudinal na atenuação do Potencial de Transporte de Sedimentos em Bacias Hidrográficas: o caso do Parque Estadual de Terra Ronca (GO), Brasil." Revista Brasileira de Geografia Física 12, no. 5 (June 28, 2019): 1730. http://dx.doi.org/10.26848/rbgf.v12.5.p1730-1745.

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A forma dos perfis longitudinais dos cursos d’água associada à distribuição das planícies aluviais adjacentes permitem identificar trechos com predomínio de processos agradacionais e denudacionais nos sistemas fluviais. Este trabalho identifica trechos dos perfis longitudinais dos rios a montante do Parque Estadual de Terra Ronca, no nordeste do estado de Goiás, que possuem tendências diferentes para transferência de sedimentos para jusante. Os rios cujos perfis longitudinais mais atenuam o potencial de transferência de sedimentos são: o São Vicente, da Lapa e Angélica. A forma dos perfis e a distribuição das planícies aluviais estão intrinsecamente ligados aos compartimentos geomorfológicos da área do Parque Estadual de Terra Ronca e à evolução do relevo regional, influenciando o transporte de sedimentos da rede de drenagem.The Role of the Longitudinal Profile in the attenuation of the Potential of Transport of Sediments in Watersheds: the case of the Terra Ronca State Park (GO), Brazil A B S T R A C TThe shape of the longitudinal profiles of rivers associated with the distribution of the adjacent floodplains allows identifying sections with predominance of aggradational and denudational processes in the fluvial systems. This paper identifies stretches of the longitudinal profiles of the rivers upstream of the Terra Ronca State Park, in the northeast of the state of Goiás, which have different trends to transfer of sediments to downstream. The rivers whose longitudinal profiles more attenuate the sediment transfer potential are: São Vicente, Lapa and Angélica. The shape of the profiles and the distribution of alluvial plains are intrinsically linked to the geomorphological compartments of the Terra Ronca State Park’s area and the evolution of the regional relief, influencing the sediment transportation of the fluvial drainage network.Keywords: sediment transportation, alluvial plains, geomorphological compartmentation.
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Retelle, Michael J. "Stratigraphy and Sedimentology of Coastal Lacustrine Basins, Northeastern Ellesmere Island, N. W. T." Géographie physique et Quaternaire 40, no. 2 (December 4, 2007): 117–28. http://dx.doi.org/10.7202/032632ar.

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ABSTRACT Sediment cores recovered from three high arctic coastal lake basins contain a sequence of glaciomarine sediments overlain by laminated to massive-bedded lacustrine sediments. Glaciomarine sediments were deposited while the basins were isostatically depressed below sea level. Subsequent to emergence of the basin from the sea, lacustrine sediments accumulated in each basin. A transitional fades between the marine and lacustrine units represents an isolation interval during which trapped sea water lay beneath a freshwater lens. Sedimentological and faunal evidence from sediment cores demonstrates that embayments were closed and fluvial sedimentation was minimal during the glacial maximum (ca. 8000-8200 BP) Subsequent increases in sand content and macrofaunal abundance reflects increases in mobility of sea ice and fluvial input during the middle Holocene. Late HoIocene cooling trends are demonstrated by decreases in ice rafted material and an increase in diffuse bedding in lake surface sediments.
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Dissertations / Theses on the topic "Fluvial sediments"

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Heim, Sabine. "Geochronology of anthropogenic contaminants in fluvial sediments /." Aachen : Shaker, 2005. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=014779100&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.

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Taylor, Katherine Sarah. "Ephemeral-fluvial sediments as potential hydrocarbon reservoirs." Thesis, University of Aberdeen, 1994. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=123206.

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Although reservoirs formed from ephemeral-fluvial sandstones have previously been considered relatively simple, unresolved problems of sandbody correlation and production anomalies demonstrate the need for improved understanding of their internal complexity. Ephemeral flows occur in direct response to precipitation, receiving little or no water from springs or other long-continued sources. They consequently predominate in dryland regions where precipitation is high in intensity, short lived and of limited areal extent. Resulting flow is high energy, relatively shallow and also restricted in duration and areal coverage. High transmission losses, abundant loose material and sparse vegetation result in highly concentrated flows which dissipate rapidly, causing a downstream decrease in flow discharge. Sediments deposited from these flows include parallel laminated sands, massive sands, scour-fill sands, transitional lower to upper flow regime dunes, and commonly contain numerous erosional discontinuities, scattered mudclasts, rapid grain size changes and deformational features. Large quantities of rainfall falling over longer periods produces steady flows dominated by well sorted, lower flow regime bedforms which have moderately well developed fining-up sequences. High intensity rainfall falling for shorter periods produces unsteady flows which are characterised by more poorly sorted, upper flow regime bedforms and an absence of fining-up sequences. Outcropping ephemeral-fluvial systems have been studied in order to determine the main features and processes occurring in sand-rich ephemeral systems and to identify which features will be of importance in a hydrocarbon reservoir. The Lower Jurassic Upper Moenave and Kayenta Formations of south-eastern Utah and northern Arizona comprise complex series of stacked, sand-dominated sheet-like palaeochannels suggestive of low sinuosity, braided systems.
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Heim, Sabine [Verfasser]. "Geochronology of Anthropogenic Contaminants in Fluvial Sediments / Sabine Heim." Aachen : Shaker, 2005. http://d-nb.info/118658825X/34.

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Ewald, Karl Heins. "Caracterização de formas topográficas em fundos de vale no Planalto de Cascavel, Região Oeste do Estado do Paraná." Universidade Estadual do Oeste do Paraná, 2013. http://tede.unioeste.br:8080/tede/handle/tede/1655.

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Rivers are important agents working in the sculpturing of relief, through its high transport capacity of sediments originary from slopes and marginal erosion. The modeling occurs through the processes of erosion and deposition of sediments, which depend on variables such as lithological composition, slope, and flooding. The processes that originate topographic forms are widely described in the literature of alluvial-bed rivers, however little is known about the occurrence of these forms in mixed bed channels (alluvial-rock) and bedrock channel. In this context, this research aims to describe the topographic forms of the valleys on the Cascavel Plateau. The method for the recognition of these forms is the topographic mapping of cross sections in different parts of the channel located at the top, middle and lower course. The mapping is performed with a set level and optical sights. Were mapped four fluvial channels, two channels in areas with altimetric elevations below 400 meters, and two other channels with elevations above 700 meters. The channels have floodplains with varying lengths. Topographic forms were found as dikes, point bars, flood inundation basins, pools and riffles. The data collected show strong channel incision in the sections corresponding to the upper parts of the channels, and that in the course stretches of low flood plains are well developed. Channel meandering is a characteristic feature of the Cascavel Plateau. The formation of point bars is directly associated with the channel marginal erosion, whereas the dikes are the result of sediment settling. The pool-riffle sequences occur by the reduction of the flow velocity in some places, and, in others, by the presence of woody debris. In some parts of the river where are rock outcrop was observed the formation of pot-holes
Os rios são importantes agentes atuando na esculturação do relevo por meio da sua alta capacidade de transporte de sedimentos originários das vertentes e dos processos de erosão marginal. A modelagem ocorre através dos processos de erosão e deposição de sedimentos, que dependem de variáveis como composição litológica, declividade e cheias. Os processos que originam as formas topográficas são descritos vastamente na literatura sobre rios de leito aluviais, no entanto pouco se sabe sobre a ocorrência dessas formas em canais de leitos mistos (aluviais-rochosos) e leitos rochosos. Nesse contexto esta pesquisa objetiva a descrição das formas topográficas de fundos de vale no Planalto de Cascavel. O método para o reconhecimento dessas formas topográficas consiste no mapeamento de seções transversais em trechos distintos do canal localizados no alto, médio e baixo curso. O mapeamento é realizado com um conjunto de nível ótico e mira. Foram mapeados quatro canais fluviais, sendo dois canais em áreas com cotas altimétricas inferiores a 400 metros e, outros dois canais com cotas superiores a 700 metros. Os canais apresentam planícies de inundação com extensões variadas. Foram encontradas formas topográficas como diques, barras em pontal, bacias de inundação, soleiras e depressões. Os dados coletados mostram que há forte incisão do canal nos trechos correspondentes ao alto curso dos canais, e, que nos trechos de baixo curso as planícies de inundação são bem desenvolvidas. O meandramento de canais é uma característica do Planalto de Cascavel. A formação de barras em pontal está associada diretamente a erosão marginal, enquanto que os diques são resultantes da decantação de sedimentos. As sequências de soleiras-depressões ocorrem pela diminuição da velocidade do fluxo em alguns trechos, e, em outros, pela presença de detritos lenhosos. Nos trechos rochosos onde há afloramento rochoso foi observada a formação de marmitas
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Evans, Dyfed. "Fluvial dispersal of heavy metals in contaminated soils and sediments." Thesis, University of Bradford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334773.

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Saup, Casey Morrisroe. "Biogeochemical Cycling in Pristine and Mining-Impacted Upland Fluvial Sediments." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1593664378874682.

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Tofelde, Stefanie [Verfasser], and Taylor [Akademischer Betreuer] Schildgen. "Signals stored in sediment : fluvial sediments as records of landscape evolution / Stefanie Tofelde ; Betreuer: Taylor Schildgen." Potsdam : Universität Potsdam, 2018. http://d-nb.info/1218404566/34.

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Guarch, Ribot Alba. "Dissolved organic matter fluctuations in an intermittent headwater stream: from storm oscillations to decadal hydrological changes = Fluctuacions de la matèria orgànica dissolta en un riu de capçalera intermitent : de crescudes a canvis hidrològics decennals." Doctoral thesis, Universitat de Barcelona, 2017. http://hdl.handle.net/10803/406137.

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Dissolved organic matter (DOM) is an important source of carbon for aquatic microorganisms and it regulates many biogeochemical processes. Therefore, changes in river DOM concentration and properties could notably affect the functioning of fluvial and coastal ecosystems and alter the global carbon cycle. The DOM in headwater streams is strongly influenced by hydrology, as a consequence of the modification of catchment flow paths with high discharges. During storm events, the catchment hillsides are washed and terrigenous DOM is transported to rivers. In the Mediterranean region, the precipitation regime and evapotranspiration strongly modulate fluvial hydrology, which shows low discharges in summer and even flow disappearance. These dry–wet cycles of conditions affect many ecological and biogeochemical processes. In this thesis, I analyse a long time series of discharge and DOM data from Fuirosos, an intermittent headwater stream in NE Spain. My aim is to examine the relationship between DOM and hydrology at different temporal scales. First, I characterise the hydrological regime of this Mediterranean stream. A decrease in discharge was revealed, although trends in temperature and precipitation were not significant. In contrast, I did not find a clear temporal trend in dry period duration. However, rewetting has been significantly delayed, moving from September to October. The frequency of storm events decreased over the interval 1998–2015, showing a significant positive relationship with solar activity with a 2-year lag. Dissolved organic carbon (DOC) concentration saw a slight decrease during the study period, which was opposed to that observed in boreal systems. This pattern might respond to a reduction of terrigenous DOC input from forest hillsides as a consequence of the decrease in flushing episodes. The DOC temporal dynamics during the rewetting was regulated by dry period duration. Discharge oscillations explained up to 50% of total DOC variability during the wet period. Notably, this weight of discharge increased significantly over the years. DOM quality was also explored, and described in terms of absorbance and fluorescence properties. Most of the DOM properties were strongly related to discharge, revealing the input of allochthonous, degraded, aromatic, humic and large-molecular DOM under high flow conditions. However, these relationships were altered during drying and rewetting periods. The DOM responses at the individual storm event scale were highly heterogeneous. Multiple linear regression and commonality analyses showed that, in addition to the magnitude of storm episodes, antecedent hydrological conditions, namely pre-event basal flow and the magnitude of the previous storm event, played a significant role in regulating the trends and shapes of DOM–discharge hysteresis. Finally, I identified the differences and similarities in the DOM–discharge relationships between the intermittent Mediterranean stream analysed herein and a perennial Alpine stream with higher mean discharge (Oberer Seebach). The DOM in Fuirosos was significantly more concentrated, more terrigenous, more degraded, more aromatic and more humified. The sign of the global DOM–discharge response was the same in both streams. However, discharge was a more robust predictor of DOM variability in Oberer Seebach. In fact, low flow and rewetting periods in Fuirosos introduced considerable dispersion into the relationship. During snowmelt in Oberer Seebach the sensitivity to discharge also decreased or disappeared. The flushing/dilution patterns were essentially associated with the magnitude of storm events in Fuirosos. In contrast, the DOM quality change was more coupled to basal flow conditions in Oberer Seebach, while the storms were behind the DOC oscillations. This study attests to the importance of generating and analysing long-term and high-frequency biogeochemical series, which allow relationships between DOM and hydrology to be explored in intermittent headwater streams that are subjected to extreme hydrological regimes.
La matèria orgànica dissolta (MOD) és una important font de carboni per als microorganismes aquàtics i regula molts processos biogeoquímics. La MOD en els rius de capçalera està modelada principalment per la hidrologia. A la regió mediterrània, el règim de precipitació i evapotranspiració impacta fortament la hidrologia fluvial, que mostra cabals baixos a l’estiu i pot arribar fins i tot a la seva desaparició. En aquesta tesi hem analitzat un sèrie temporal a llarg termini de cabal i MOD a Fuirosos, un riu de capçalera intermitent al NE de la Península Ibèrica. El nostre objectiu era examinar la relació entre la MOD i la hidrologia en diferents escales temporals. Primer, vam caracteritzar el règim hidrològic d’aquest riu mediterrani. Al llarg de l’estudi es va revelar una disminució del cabal, no vam trobar una tendència temporal clara en la durada de la sequera i la freqüència de les crescudes va disminuir en l’interval 1998–2015. La concentració de carboni orgànic dissolt (COD) ha patit una lleugera disminució durant el període d’estudi, cosa que contrasta amb el que s’ha observat en sistemes boreals. La dinàmica temporal del COD durant el període de transició va ser regulada per la durada del període sec. La qualitat de la MOD també va ser explorada, i descrita en termes de propietats d’absorbència i fluorescència. La majoria de les propietats de la MOD van ser clarament relacionades amb el cabal. No obstant, aquestes relacions van ser alterades durant els períodes de fragmentació i de transició. A més de la magnitud dels episodis de crescuda, les condicions hidrològiques prèvies juguen un paper significatiu perquè regulen les tendències i formes de les histèresis MOD–cabal. Per acabar, vaig identificar les diferències i semblances en les relacions MOD–cabal entre el riu mediterrani intermitent analitzat i un riu perenne alpí amb un cabal mitjà superior (Oberer Seebach). Aquest estudi testifica la importància de generar i analitzar sèries biogeoquímiques de llarga durada i alta freqüència, que permeten explorar les relacions entre la MOD i la hidrologia en rius de capçalera intermitents que estan subjectes a règims hidrològics extrems.
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Chandra, Shobhit. "Fluvial landforms and sediments in the north-central Gangetic Plain, India." Thesis, University of Cambridge, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309855.

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Hu, Mengyu. "Plio-Pleistocene environmental variations inferred from thick sediment sequences in the North China Plain." Thesis, University of Oxford, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.363619.

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Books on the topic "Fluvial sediments"

1

Smith, Norman D., and J. Rogers. Fluvial sedimentology VI. Oxford: Blackwell Science, 1999.

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Marriott, Susan B., Suzanne F. Leclair, and Michael D. Blum. Fluvial sedimentology VII. Malden, MA: Blackwell Pub., 2005.

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G, Ethridge Frank, Flores Romeo M, and Harvey Michael D, eds. Recent developments in fluvial sedimentology: Contributions from the Third International Fluvial Sedimentology Conference. Tulsa, Okla., U.S.A: Society of Economic Paleontologists and Mineralogists, 1987.

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Edwards, Thomas K. Field methods for measurement of fluvial sediment. [Denver, Colo.?]: Dept. of the Interior, U.S. Geological Survey, 1986.

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Douglas, Glysson G., Guy Harold P, and Geological Survey (U.S.), eds. Field methods for measurement of fluvial sediment. Reston, Va: U.S. Geological Survey, 1999.

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River processes: An introduction to fluvial dynamics. London: Arnold, 2003.

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Stevens, Herbert H. Computer programs for computing particle-size statistics of fluvial sediments. Denver, Colo: U.S. Geological Survey, 1986.

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Stevens, Herbert H. Computer programs for computing particle-size statistics of fluvial sediments. Denver, Colo: U.S. Dept. of the Interior, Geological Survey, 1986.

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Stevens, Herbert H. Computer programs for computing particle-size statistics of fluvial sediments. Denver, Colo: U.S. Dept. of the Interior, Geological Survey, 1986.

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Törnqvist, Torbjörn E. Fluvial sedimentary geology and chronology of the Holocene Rhine-Meuse delta, the Netherlands. Utrecht: Koninklijk Nederlands Aardrijkskundig Genootschap, 1993.

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Book chapters on the topic "Fluvial sediments"

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Keen-Zebert, Amanda. "Luminescence, Fluvial Sediments." In Encyclopedia of Scientific Dating Methods, 465–69. Dordrecht: Springer Netherlands, 2015. http://dx.doi.org/10.1007/978-94-007-6304-3_3.

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Keen-Zebert, Amanda. "Luminescence, Fluvial Sediments." In Encyclopedia of Scientific Dating Methods, 1–9. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-6326-5_3-1.

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Rivard, Lambert A. "Section 7 Fluvial System Sediments." In Satellite Geology and Photogeomorphology, 161–82. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-20608-5_8.

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Westrich, Bernd. "Hydromechanic Aspects of Contaminated Sediment Transport in Fluvial Systems." In Sediments and Water Interactions, 63–68. New York, NY: Springer New York, 1986. http://dx.doi.org/10.1007/978-1-4612-4932-0_6.

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Ebinghaus, R., and R. D. Wilken. "Mercury Distribution and Speciation in a Polluted Fluvial System." In Sediments and Toxic Substances, 215–44. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/978-3-642-79890-0_9.

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Stokes, Stephen, and Des E. Walling. "Radiogenic and Isotopic Methods for the Direct Dating of Fluvial Sediments." In Tools in Fluvial Geomorphology, 231–67. Chichester, UK: John Wiley & Sons, Ltd, 2005. http://dx.doi.org/10.1002/0470868333.ch9.

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Rivard, Lambert A. "Surficial Deposits Group F · Fluvial System Sediments." In Geohazard-associated Geounits, 1–126. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/b93844_9.

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Amsler, Mario L., Edmundo C. Drago, and Aldo R. Paira. "Fluvial Sediments: Main Channel and Floodplain Interrelationships." In The Middle Paraná River, 123–42. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-70624-3_5.

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Wehmiller, John. "Amino Acid Racemization, Fluvial and Lacustrine Sediments (AAR)." In Encyclopedia of Scientific Dating Methods, 1–8. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-6326-5_114-4.

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Wehmiller, John F. "Amino Acid Racemization, Fluvial and Lacustrine Sediments (AAR)." In Encyclopedia of Scientific Dating Methods, 40–44. Dordrecht: Springer Netherlands, 2015. http://dx.doi.org/10.1007/978-94-007-6304-3_114.

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Conference papers on the topic "Fluvial sediments"

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Abdullatif, Osman, Mutasim Osman, Mazin Bashri, Ammar Abdlmutalib, and Mohamed Yassin. "Sedimentology and Evolution of the Fluvial-Deltaic System: A Modern Depositional Model Analog from the Red Sea Coastal Region, Saudi Arabia." In SPE Middle East Oil & Gas Show and Conference. SPE, 2021. http://dx.doi.org/10.2118/204558-ms.

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Abstract Siliciclastic sediments represent important lithological unit of the Red Sea coastal plain. Their subsurface equivalents are important targets of groundwater aquifer and hydrocarbon reservoirs in the region. The lithofacies of the modern fluvial deltaic system has several distinct geomorphic units and sub-environments such as alluvial, fluvial, delta plain, aeolian, intertidal, coastal sabkha and eustuarine sediments. This study intends to characterize the lithofacies and the depositional environments and to produce an integrated facies model for this modern fluvial-deltaic system. The study might provide a valuable modern analog to several important subsurface Neogene formations that act as important hydrocarbon reservoirs and groundwater aquifers. The study integrates information and data obtained from landsats, maps and detailed field observation and measurements of facies analysis of the fluvial and deltaic along traveses from the Arabian Shield to the Red Sea coast. The lithofacies sediment analysis revealed four main lithofacies associations namely lithofacies A,B,C ad D. Lithoacies Associations A, which represents the oldest unit is dominated by coarse gravel with minor sands facies. While the lithofacies B is dominated byfine gravel and sand lithofacies, occasionally pebbly, vary from horizontal, planar to massive sands with minor laminated to massive silts and mud facies. The lithofacies in A and B show lateral proximal to distal variation as well as characteristic vertical stacking patterns. The Facies Association A and B indicates a change in fluvial depositional styles from gravelly alluvial fans to gravelly sandy fluvial systems. The lithofacies association C represents the recent fluvial system which consists of minor gravel lag deposits associated maily with various sand lithofacies of planner, horizontal and massive sand associated with massive and limainted sand and mud lithofacies. The lithofacies Association D is dominated with Barchan sand dunes local interfigger with muddy iinterdunes and sand sheets. Lithofacies D occupies rather more distal geomporphic position of the fluvial deltaic system that is adjace to coastal sabkha. The lithofacies associations described here document the evolution and development of the coastal plain sediments through space and time under various autocyclic and allocyclic controls. This included the tectonics and structural development associated with the Red Sea rifting and opening since the Oligocene – Miocene time. Others controls include the evolution of the Arabian shield (provenance) and the coastal plain through space and time as controlled by tectonics, sediment supply, climate and locally by autocyclic environmental This study might be beneficial for understanding the controls and stratigraphic evolution of the Red Sea region and will be of great value for reservoir and aquifer characterization, development and management. This modern analog model can also help in providing geological baseline information that would be beneficial for understanding similar ancient fluvial deltaic sediments. The study might provide guides and leads to understand the subsurface facies, stratigraphic architecture and heterogeneity of any potential groundwater aquifers and hydrocarbon reservoirs.
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DOUCETTE, J., and C. PINILLA. "A TALE OF FIVE HARBOURS: FLUVIAL VS. LONGSHORE SEDIMENT SOURCES IN GREAT LAKES HARBOURS." In Coastal Sediments 2015. WORLD SCIENTIFIC, 2015. http://dx.doi.org/10.1142/9789814689977_0133.

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Dezso, Jozsef. "RANDOMLY LAYERED FLUVIAL SEDIMENTS INFLUENCED GROUNDWATER-SURFACE WATER INTERACTION." In 17th International Multidisciplinary Scientific GeoConference SGEM2017. Stef92 Technology, 2017. http://dx.doi.org/10.5593/sgem2017h/33/s12.041.

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Wallace, Corey D., Audrey H. Sawyer, Mohamad Reza Soltanian, and Rebecca Barnes. "NITRATE REMOVAL WITHIN HETEROGENEOUS FLUVIAL SEDIMENTS UNDER TIDAL INFLUENCE." In GSA Annual Meeting in Phoenix, Arizona, USA - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019am-338852.

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Jodeau, M., G. Antoine, M. Cormier, Q. Monnoyer, and N. Gratiot. "Settling velocity of sediments from reservoirs, laboratory measurements and numerical modeling." 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/10.1201/9781315644479-149.

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Lo, Edward, Chris Matocha, Michael McGlue, and Aguinaldo Silva. "CLAY MINERALOGY OF MODERN FLUVIAL SEDIMENTS FROM THE PANTANAL BASIN, BRAZIL." In GSA Connects 2021 in Portland, Oregon. Geological Society of America, 2021. http://dx.doi.org/10.1130/abs/2021am-371057.

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Beres, Milan, Heinrich Horstmeyer, Alan Green, and Petet Huggenberger. "Three‐dimensional georadar mapping of glacio‐fluvial sediments: Processing and preliminary interpretation." In SEG Technical Program Expanded Abstracts 1996. Society of Exploration Geophysicists, 1996. http://dx.doi.org/10.1190/1.1826780.

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Weitz, Catherine, Janice Bishop, John A. Grant, Sharon Wilson, Arun Saranathan, Yuki Itoh, and Mario Parente. "CLAY SEDIMENTS DERIVED FROM FLUVIAL ACTIVITY IN AND AROUND LADON BASIN, MARS." In GSA 2020 Connects Online. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020am-353860.

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Perret, E., C. Berni, A. Herrero, B. Camenen, and K. El kadi Abderrezzak. "Laser scanning method to characterize bed arrangement and its influence on incipient motion of gravel sediments." 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/10.1201/9781315644479-152.

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Joo, Young Ji, G. S. Soreghan, and Megan E. Elwood Madden. "UNEXPECTEDLY LOW CHEMICAL WEATHERING RECORDED IN FLUVIAL SEDIMENTS OF A HOT-HUMID SYSTEM." In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-286693.

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Reports on the topic "Fluvial sediments"

1

Moorman, B. J., A. S. Judge, and D. G. Smith. Examining Fluvial Sediments using Ground Penetrating Radar in British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1991. http://dx.doi.org/10.4095/132493.

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Humphrey, Neil F. Quantifying Fluvial Sediment Transport by Anchor Ice. Fort Belvoir, VA: Defense Technical Information Center, September 1999. http://dx.doi.org/10.21236/ada630378.

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Thorne, Colin R., and Kevin S. Skinner. Geomorphic Approach to Regional Sediment Management in Engineered and Restored Fluvial Systems. Fort Belvoir, VA: Defense Technical Information Center, August 2001. http://dx.doi.org/10.21236/ada396050.

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Ogston, Andrea S. Processes Controlling Transfer of Fine-Grained Sediment in Tidal Systems Spanning a Range of Fluvial Influence. Fort Belvoir, VA: Defense Technical Information Center, September 2012. http://dx.doi.org/10.21236/ada572944.

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Castelltort Aiguabella, F. X., and J. C. Balasch Solanes. ¿PUEDE EL EBRO MULTIPLICAR SUS CRECIDAS MÁS DE UN ORDEN DE MAGNITUD? Ilustre Colegio Oficial de Geólogos, November 2020. http://dx.doi.org/10.21028/fxc.2020.11.11.

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Las megacrecidas fluviales son episodios de una gran trascendencia geomorfológica por su alta capacidad energética y su muy baja frecuencia en el registro geológico. Su rareza es superior en áreas alejadas de las grandes masas glaciares continentales. Los problemas de desagüe de los desfiladeros del curso bajo del Ebro son la causa de la acumulación de depósitos fluviales con origen en el río Ebro que han remontado los valles de torrentes tributarios en la cubeta de Móra. El paradigma de estas formaciones es el torrente del Comte, donde dos unidades deposicionales de edad diferente muestran procesos de flujo torrente arriba, hasta unos 4 km, y reflujo torrente abajo, con estructuras sedimentarias de muy alta energía. El uso de herramientas de simulación hidráulica bidimensional indica que serían necesarios caudales punta superiores a los 100.000 m3 · s-1, con alturas de agua de unos 24 m en la zona de la confluencia, para introducir estos sedimentos a las posiciones de afloramiento. Los efectos se verían reforzados por la influencia de niveles del mar más elevados que el actual.
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Computer programs for computing particle-size statistics of fluvial sediments. US Geological Survey, 1986. http://dx.doi.org/10.3133/wri864141.

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Methods for determination of inorganic substances in water and fluvial sediments. US Geological Survey, 1989. http://dx.doi.org/10.3133/twri05a1.

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Methods for the determination of organic substances in water and fluvial sediments. US Geological Survey, 1987. http://dx.doi.org/10.3133/twri05a3.

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Field methods for measurement of fluvial sediment. US Geological Survey, 1999. http://dx.doi.org/10.3133/twri03c2.

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Field methods for measurement of fluvial sediment. US Geological Survey, 1998. http://dx.doi.org/10.3133/twri03c2_1998.

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