Thematische Bibliographien / FLUVIAL CHARACTERISTICS

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Auswahl der wissenschaftlichen Literatur zum Thema „FLUVIAL CHARACTERISTICS“

Autor: Grafiati
Veröffentlicht am 18. Mai 2024

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Zeitschriftenartikel zum Thema "FLUVIAL CHARACTERISTICS"

1

Woronko, Barbara, Paweł Zieliński und 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, Nr. 2 (01.06.2015): 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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Lin, Zhipeng, Le Chen, Jingfu Shan, Tan Zhang, Qianjun Sun und Yiwu Wang. „A New Sequence Stratigraphic Framework of Terrestrial Fluvial“. Studies in Engineering and Technology 4, Nr. 1 (30.07.2017): 85. http://dx.doi.org/10.11114/set.v4i1.2521.

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Currently, the recognition and research on the classification of fluvial types mainly focus on the description and results of a series of indicators, such as the plane shape and sediment characteristics. However, there is limited literacy about how to demonstrate the fluvial types from the depositional process, especially less on sequence model of inland fluvial. Thus, this paper aims o propose a new kind of sequence stratigraphic framework, which is able to reflect the fluvial processes under the perspective of sequence stratigraphy. Accordingly, we use the principle of concrete analysis for concrete problems by comprehensively summing up the previous classification schemes of river types. With the research method of sedimentation process, new fluvial systems tracts for fluvial are presented here, including four parts: low fluvial system tract (LFST), advancing fluvial system tract (AFST), flooding fluvial system tract (FFST), receding fluvial system tract (RFST). Moreover, these could be applied to tackle the problem of the traditional division of fluvial. Various rivers have the different characteristics of systems tracts, then this may play a vital role in the discrimination of meandering river, braided river, anastomosing river and branched river. This study embodies the philosophical thought of Process Sedimentology and may contribute to revealing the deposition process of the fluvial system more profoundly from the aspect of genetic mechanism and evolution course. Most importantly, the fluvial classification system is definitely improved from the description stage to a complete rational stage.
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Hassan, Marwan A., Hal Voepel, Rina Schumer, Gary Parker und Luigi Fraccarollo. „Displacement characteristics of coarse fluvial bed sediment“. Journal of Geophysical Research: Earth Surface 118, Nr. 1 (25.02.2013): 155–65. http://dx.doi.org/10.1029/2012jf002374.

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Payenberg, T. H. D., und S. C. Lang. „RESERVOIR GEOMETRY OF FLUVIAL DISTRIBUTARY CHANNELS—IMPLICATIONS FOR NORTHWEST SHELF, AUSTRALIA, DELTAIC SUCCESSIONS“. APPEA Journal 43, Nr. 1 (2003): 325. http://dx.doi.org/10.1071/aj02017.

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The exploration and development of stratigraphically trapped hydrocarbons requires detailed knowledge of the morphologies and reservoir characteristics of the stratigraphic body. Fluvial distributary channels are important exploration targets because they are typically isolated reservoirs, laterally and vertically sealed by delta plain and abandoned channel mudstone, and thus form excellent stratigraphic traps. The morphology and reservoir characteristics of fluvial distributary channels have been confused with fluvial channels in the past. Knowing the characteristics of fluvial distributary channels and their difference from fluvial channels is the key to the successful exploration and development of distributary channel reservoirs.Fluvial distributary channels, formed by mixed-load systems, are commonly rectilinear channel segments found only on the delta plain between the head of passes and the depositional mouthbars. While fluvial channel reservoirs are mainly sandstone deposits of meander pointbars or braided sheets, fluvial distributary channel reservoirs are typically elongated sandy channel sidebars attached to morphologically rectilinear channel walls. The sidebars form by both lateral and downstream accretion resulting from flow in a confined, but lowsinuosity thalweg, which may be filled with organic mud following channel abandonment. On 3D seismic data the morphology of a fluvial distributary channel is often slightly sinuous and can easily be mistaken for part of a meander channel belt.Fluvial distributary channels are usually thinner and shallower compared to their updip fluvial channel belts. Width-thickness ratios for fluvial distributary channel reservoirs are on average 50:1 (range 15:1 to 100:1), while meandering fluvial channel reservoirs have widththickness ratios typically >100:1, and braided river reservoirs show ratios of 500:1 or higher. Examples from the Mahakam Delta are used to illustrate these issues. Implications for exploration and development of deltaic deposits on the North West Shelf of Australia are discussed.
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Huang, Kai, Chunsheng Shen, Kai Kang, Libing Wang, Zhongbo Xu und Lin Li. „Characteristics of Mudstone in Complex Fluvial Sedimentary System in Bohai L Oilfield“. Earth Science Research 7, Nr. 2 (08.07.2018): 79. http://dx.doi.org/10.5539/esr.v7n2p79.

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Bohai L oilfield develops a complex fluvial sedimentary system, which includes many types of fluvial sedimentary facies. Based on the coring well of oil field, the distribution characteristics of mudstone are analyzed, it is shown that the mudstone has similar internal structure and can be classified into four types according to its color: gray to grayish, variegated, brown to gray-brown and khaki, the assemblage has a large gray to grayish mudstone section, large gray to grayish mudstone intercalated thin layer sandstone, gray to grayish mudstone associated with variegated (brown) mudstone, grayish mudstone associated with lacustrine sand grain bedding sandstone, concomitant generation of large staggered bedding sandstone and grayish mudstone, mixed (gray-brown) mudstone associated with large staggered bedding sandstone, interaction between different colors of mudstone and sandstone and large interlaced sandstone intercalated with thin layer mudstone. The mudstone color is mainly gray and grayish, and very few oxidized mudstone is developed alone, which indicates that fluvial mudstone may be formed in the reductive environment in humid climate, and the fluvial mudstone in this area may be formed in the oxidizing environment, which is different from the general understanding of fluvial facies, the oxidation color is the result of the later transformation.
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ZHANG, Yuanfu, Xin DAI, Min WANG und Xinxin LI. „The concept, characteristics and significance of fluvial fans“. Petroleum Exploration and Development 47, Nr. 5 (Oktober 2020): 1014–26. http://dx.doi.org/10.1016/s1876-3804(20)60113-6.

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Ferreira, Cesar Cardoso, Paulo César Rocha, Arnaldo Yoso Sakamoto und Heloissa Gabriela Silva Sokolowski. „Análise Temporal da Dinâmica de Aspectos Físicos Fluviais no Rio Abobral-Pantanal-MS-BR“. Revista Brasileira de Geografia Física 12, Nr. 7 (29.02.2020): 2672. http://dx.doi.org/10.26848/rbgf.v12.7.p2672-2684.

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O conhecimento de características geomorfológicas fluviais é de suma relevância para estudos voltados aos recursos hídricos, tanto do ponto de vista da hidráulica, da sedimentologia, como também do ponto de vista do planejamento regional. Nesse sentido, este artigo tem como objetivo individualizar e analisar sazonalmente a dinâmica fluvial do rio Abobral no Pantanal-MS situado na bacia do Alto Paraguai, compreendendo uma área composta por extensa superfície de acumulação sujeita a inundações periódicas. Para alcançar o objetivo supracitado, foram executados procedimentos divididos em quatro etapas: coleta de amostras; individualização morfológica, sedimentológica e hidráulica; processamento dos dados cartográficos e estabelecer correlações entre as variáveis físico-fluviais. Deste modo, observou-se que tipicamente o trecho do rio estudado, é caracterizado como meandrante em planície de inundação, com aspectos de sazonalidades de cheias e secas, além disso, no período de inverno, começa a cessar a vazão e o rio Abobral, no qual, configura-se seccionado, com presença de bancos de areias e aspectos de lagos encaixados e alongados na planície. Temporal analysis of the fluvial physical aspects dynamics in the Aboral river-Pantanal-MS-BR A B S T R A C TThe knowledge of fluvial geomorphological characteristics is of great relevance for studies on water resources, both from the point of view of hydraulics and sedimentology, as well as from the point of view of regional planning. In this sense, this article aims to individualize and analyse seasonally the fluvial physical aspects of the Abobral river in the Pantanal-MS located in the Upper Paraguay watershed, an area composed by extensive accumulation surface subject to periodic flooding. In order to achieve the aforementioned objective, the executed procedures divided into four steps: sample collection; morphological, sedimentological and hydraulic individualization; cartographic data processing and the establishment of correlations between the physical-fluvial variables. In this way, it was observed that typically the river section studied typically characterized as meandering in floodplain, with aspects of seasonality of floods and droughts, in addition, in the winter period, the flow and the Abobral river cease, which, it is sectioned, with the presence of sand banks and aspects of lakes embedded and elongated in the plain.Keywords: Pantanal, Abobral river, fluvial geomorphology.
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Guo, Shao Lei, und Xuan Ying Guo. „The Fluvial Process of Wandering Reach in the Lower Yellow River“. Applied Mechanics and Materials 438-439 (Oktober 2013): 1309–13. http://dx.doi.org/10.4028/www.scientific.net/amm.438-439.1309.

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There are three characteristics of river channel which are wandering, transitional, bending in the Lower Yellow River. The fluvial process is complicated and variable. The channel characteristics of wandering reach was analyzed, and then based on the measured data and model test data, the formation conditions, basic characteristics and influencing factor of the fluvial process law in wandering river were analyzed. All of this can provide technical guidance and theoretical support for river regulation of the Lower Yellow River.
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Zheng, Dong-Yu, und Si-Xuan Wu. „Principal component analysis of textural characteristics of fluvio-lacustrine sandstones and controlling factors of sandstone textures“. Geological Magazine 158, Nr. 10 (21.05.2021): 1847–61. http://dx.doi.org/10.1017/s0016756821000418.

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AbstractTextures are important features of sandstones; however, their controlling factors are not fully understood. We present a detailed textural analysis of fluvio-lacustrine sandstones and discuss the influences of provenance and depositional environments on sandstone textures. The upper Permian – lowermost Triassic Wutonggou sandstones in the Bogda Mountains, NW China, are the focus of this study. Sandstone thin-sections were studied by point counting and their textures were analysed using statistical and principal component analysis. Fluvial lithic, fluvial feldspathic, deltaic lithic, deltaic feldspathic, littoral lithic and littoral feldspathic sandstone were classified and compared. These comparisons indicate that lithic and feldspathic sandstones from the same depositional settings have significant differences in graphic mean, graphic standard deviation and roundness; in contrast, sandstones from different depositional settings but with similar compositions have limited differences in textures. Moreover, three principal components (PCs) are recognized to explain 75% of the total variance, of which the first principal component (PC1) can explain 44%. In bivariate plots of the PCs, sandstones can be distinguished by composition where lithic and feldspathic sandstones are placed in different fields of the plots along the axis of PC1. However, sandstones from different depositional settings overlap and show no clear division. These results indicate that provenance, mainly the source lithology, is the most significant controlling factor on sandstone texture, whereas the depositional environment has limited influence. This study improves our understanding of textural characteristics of fluvio-lacustrine sandstones and their controlling factors, and shows the potentiality of principal component analysis in sandstone studies.
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Alexouli - Livaditi, A., K. Vouvalidis, G. Livaditis und S. Pechlivanidou. „Drainage network characteristics of Athens plain at the end of the 19th century“. Bulletin of the Geological Society of Greece 40, Nr. 4 (01.01.2007): 1513. http://dx.doi.org/10.12681/bgsg.17054.

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Kephissos River is the main fluvial system of the hydrological basin of Athens. It drains the central part of Attica and almost the entire urban area of the city of Athens. In this paper, we present the results of both the qualitative and quantitative analysis of the initial drainage network of the plain before the urbanization through the processing of digitised data with GIS software. The initial drainage network of the. basin, plotted with the use of a very detailed mosaic of maps, was constructed by German cartographers (Curtius E. and Kaupert J.) at the end of the 19' century. For the analysis of the drainage network the Laws of drainage composition were used and values for the D and F indices were calculated. One of the major aspects of this article is \o reveal information about the fluvial and environmental conditions in the plain of Athens before the urbanization of the area. This kind of information is very critical because until that time (end of the 19th century) the fluvial system of Kephissos\ was natural, without any human intervention.
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Dissertationen zum Thema "FLUVIAL CHARACTERISTICS"

1

Phillips, John Mansell. „The effective particle size characteristics of fluvial suspended sediment“. Thesis, University of Exeter, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.296287.

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Tamang, Lakpa. „EFFECTS OF BOULDER LIFTING ON THE FLUVIAL CHARACTERISTICS OF LOWER BALASON BASIN IN DARJEELING DISTRICT, WEST BENGAL“. Thesis, University of North Bengal, 2013. http://ir.nbu.ac.in/handle/123456789/949.

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Landers, Mark Newton. „Fluvial suspended sediment characteristics by high-resolution, surrogate metrics of turbidity, laser-diffraction, acoustic backscatter, and acoustic attenuation“. Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/43747.

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Sedimentation (erosion, transport, and deposition) is a primary and growing environmental, engineering, and agricultural issue around the world. However, collection of the data needed to develop solutions to sedimentation issues has declined by about three-fourths since 1983. Suspended-sediment surrogates have the potential to obtain sediment data using methods that are more accurate, of higher spatial and temporal resolution, and with less manually intensive, costly, and hazardous methods. The improved quality of sediment data from high-resolution surrogates may inform improved understanding and solutions to environmental, engineering, and agricultural sedimentation problems. The field experiments for this research includ physical samples of suspended sediment collected concurrently with surrogate metrics from instruments including 1.2, 1.5, and 3.0 megahertz frequency acoustic doppler current profilers, a nephelometric turbidity sensor, and a laser-diffraction particle size analyzer. This comprehensive data set was collected over five storms in 2009 and 2010 at Yellow River near Atlanta, Georgia. This research project has proposed, developed, and tested a new method for evaluation of sediment size from theoretical acoustic attenuation; evaluated and further developed recently introduced empirical methods for estimating acoustic attenuation by sediment; found and quantified data mischaracterization issues for laser-diffraction metrics; defined deterministic causes for observed hysteresis and variance in suspended sediment to surrogate relations; compared the accuracy of sediment concentration models and loads for each tested surrogate; and compared sediment surrogate technologies on the basis of reliability and operational considerations.
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Rieck, Leslie O. „Associations between hydrogeomorphic characteristics and biotic community dynamics in urban streams of Columbus, Ohio, USA“. The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1563042221041466.

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Abouessa, Ashour. „Sedimentological and ichnological characteristics of Dur At Tallah siliciclastic rock sequence, and their significance in the depositional environment interpretation of tidal-fluvial system (Upper Eocene, Sirt Basin, Libya)“. Phd thesis, Université de Strasbourg, 2013. http://tel.archives-ouvertes.fr/tel-00985603.

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Dur At Talah sedimentary sequence, located at the southern side of the Sirt Basin in central Libya, is composed of 150 m thick of mainly siliciclastic rocks. The importance of this sequence is linked to the importance of the Sirt Basin as one of large hydrocarbon reservoirs in Libya. The sequence is also an excellent site for vertebrate fossils of Late Eocene, the age of the sequence. Previous studies, though very limited compared to the importance of this area, are focused on its paleontological content. Sedimentology received only scant attention before this project. This thesis is an outcrop based study in which the focus is given to the sedimentary and biogenic (trace fossils) structures, aiming at defining and interpreting depositional facies which building up the sequence. The study is mainly based on field data which are analyzed on the light of related published literature and on the comparison with modern sedimentary environments. Results of facies analysis have led to splitting the entire sequence into three genetically related intervals. The oldest, we called the New Idam Unit (around 80m), is composed of very fine sandstones to mudstones. New Idam Unit is unconformably overlain by the Sarir Unit (around 50m), composed of medium grained cross bedded sandstones (the lower 25-30 m) changes up to very coarse and microconglomeratic sandstone (the upper 20-30 m). Thus, the Sarir Unit is split into the lower Sarir Subunit and upper Sarir subunit. The New Idam Unit presents both classical and unusual sedimentary and biogenic indicators that attribute this unit to estuarine depositional environment. It starts with outer estuarine (the lower 35 m) and ends up with inner estuarine (the upper 45 m). Maximum flooding surface is located in between. Above this surface the fluvial indicators increase and tidal indicators decrease, thus providing clue for basinward (North) migration of the shoreline. The lower Sarir subunit which was previously interpreted as fluvial deposits, preserves multi-scale sedimentary structures that undoubtedly belong to tidal processes. This is especially evidenced at the lower part of the lower Sarir Subunit (LLS). Fluvial indications over dominates the tidal ones in the upper part of the lower Sarir (ULS). Due to this configuration the whole lower Sarir subunit is interpreted as shallow marine, deltaic, depositional system, occurred during sea level ¨normal¨ regression. This time, maximum flooding surface is located between the LLS and ULS. The lower Sarir subunit is terminated by subaerial unconformity, with evidences of subaerial exposure preserved at the top of the ULS. These are intruded by the upper Sarir subunit which presents clear evidences of strictly fluvial environment of deposition. The deposits of the upper Sarir subunit record the low stand system tract part of the Dur At Talah sequence. In addition to the outlined results, the sequential pattern of the depositional events is suggested for the entire sequence of Dur At Talah. This study provides a valuable information regarding the depositional and sequential aspects of the Sirt Basin during the late Eocene, it also provide an unique case study for the better understanding of the shallow marine tidal deposits.
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Johnson, Arvee Sujil. „Yielding characteristics of an overconsolidated fluvio-glacial clay from the Belfast region“. Thesis, Queen's University Belfast, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263399.

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De, Wilde Mélissa. „Conséquences des exondations pour les communautés végétales aquatiques et le fonctionnement des zones humides fluviales“. Thesis, Lyon 1, 2014. http://www.theses.fr/2014LYO10275/document.

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L'objectif de cette thèse a été de mesurer comment les modifications des régimes hydrologiques, plus particulièrement les exondations, régissent 1) certains aspects du fonctionnement des zones humides, 2) l'organisation et la dynamique à court terme des communautés végétales aquatiques et 3) la survie et la réponse plastique des végétaux aquatiques. Cette thèse aborde les questions à des échelles spatio-temporelles différentes. Premièrement, à l'échelle de la décennie, j'ai mesuré la conséquence de la baisse de la hauteur d'eau des zones humides péri-fluviales sur leur physico-chimie. Deuxièmement, à l'échelle de la saison, j'ai mesuré l'influence des caractéristiques sédimentaires des zones humides sur la réponse à court terme des communautés végétales à l'exondation. Enfin, à l'échelle de quelques semaines, je me suis intéressée à l'aptitude des espèces d'angiospermes aquatiques à mettre en place un ajustement plastique face à l'exondation, en conditions expérimentales de laboratoire et in situ, j'ai recherché les déterminismes de cette réponse (écologiques, morphologiques, phylogénétiques). En termes de caractéristiques physico-chimiques des eaux de surface, l'étude sur 15 ans de la dynamique de zones humides péri-fluviales subissant des exondations, ne conclue pas, comme cela est habituellement décrit dans la littérature, à une augmentation de la teneur en nutriments de la masse d'eau, mais plutôt des changements suggérant des variations du fonctionnement hydrogéologique des zones humides, en faveur d'une plus grande influence de la nappe de versant dans leur alimentation. La réponse in situ des communautés végétales à l'exondation diffère selon le type de sédiment. La résistance et la résilience des communautés décroissent toutes deux avec la capacité de rétention d'eau du sédiment. La capacité des plantes aquatiques à tolérer l'exondation, en conditions expérimentales, semble différer selon leur position phylogénétique, mais pas selon leur forme de croissance (rosettes ou caulescentes)
The objective of this thesis was to measure how changes in hydrological regimes, particularly dewatering govern 1) aspects of the functioning of wetlands, 2) the organization and short-term dynamics of aquatic plant communities and 3 ) survival and plastic response of aquatic plants. This thesis addresses issues at different spatial and temporal scales. First, at the decade scale, I measured the effect of water-level decreases in riverine wetlands on their physico-chemistry characteristics. Second, at the season scale, I measured the influence of sedimentary characteristics of wetlands on short-term response of plant communities to dewatering. Finally, at the scale of a few weeks, I was interested in the ability of aquatic angiosperm species to develop a plastic adjustment to dewatering, in experimental laboratory conditions and in situ, and I looked determinism of this response (ecological, morphological, phylogenetic). In terms of physico-chemical characteristics of surface waters, the 15- year study of the dynamics of riverine wetlands undergoing dewatering, not reached, as is usually described in the literature, with an increase of water body nutrient contents, but rather changes suggesting variations of the hydrogeological functioning of wetlands in favor of a greater influence of the hillslope groundwater table in their water supply. In situ response of plant communities to dewatering differs according to sediment type. Both, resistance and resilience of communities decrease with the sediment water retention capacity. The ability of aquatic plants to tolerate dewatering, in experimental conditions, seems to differ according to their phylogenetic position, but not according to their growth form (rosettes or caulescentes). Species tolerating dewatering show phenotypic adjustments such as denser aerial organs and high plasticity of the leaves, which may explain the maintenance of a similar growth rate in terrestrial and aquatic conditions in these species
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Gardes, Thomas. „Reconstruction temporelle des contaminations métalliques et organiques particulaires dans le bassin versant de l'Eure et devenir des sédiments suite à l'arasement d'un barrage. Reconstruction of anthropogenic activities in legacy sediments from the Eure River, a major tributary of the Seine Estuary (France) Flux estimation, temporal trends and source determination of trace metal contamination in a major tributary of the Seine estuary, France Temporal trends, sources, and relationships between sediment characteristics and polycyclic aromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs) in sediment cores from the major Seine estuary tributary, France Impacts à court-terme de l’arasement d’un barrage sur la morphologie du cours d’eau et la remobilisation de sédiments contaminés par les métaux traces Bioaccessibility of polycyclic aromatic compounds (PAHs, PCBs) and trace elements: Influencing factors and determination in a river sediment core“. Thesis, Normandie, 2020. http://www.theses.fr/2020NORMR038.

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L’impact anthropique sur les cours d’eau a significativement augmenté suite à la révolution industrielle engagée par les pays occidentaux. Ainsi, les modifications de la géomorphologie des cours d’eau pour le stockage de l’eau et la navigation, la conversion des surfaces à des fins agricoles, industrielles et d’urbanisation illustrent cette pression environnementale, qui se traduit, en autre, par une augmentation de rejets de divers contaminants dans les compartiments environnementaux et notamment les rivières. Une part de ces rejets peut donc se retrouver dans les matières en suspension, considérées alors comme des puits de stockage, qui transitent dans les rivières. Les aménagements des rivières et notamment la construction de barrages favorisent alors la sédimentation de ces particules contaminées au cours du temps. Ces sédiments d’origines anthropiques, également appelés legacy sediments, sont donc les témoins des activités anthropiques et permettent de reconstruire les trajectoires temporelles des contaminations au sein des bassins versants. L’Eure, affluent majeur de l’estuaire de Seine, a connu d’importantes pressions anthropiques depuis le vingtième siècle. La reconstruction temporelle des pressions anthropiques a nécessité l’association de différentes approches méthodologiques : (i) une analyse diachronique des modifications morphologiques de la rivière a été menée, conjointement à (ii) une analyse de la dynamique sédimentaire et de la nature des dépôts sédimentaires par couplage de méthodes géophysiques, sédimentologiques et géochimiques, et à (iii) la mise en place d’un réseau de suivi du comportement hydro-sédimentaire avec un échantillonnage en continu des matières en suspensions. De profondes modifications géomorphologiques se sont produites en aval du bassin versant, avec pour principales conséquences un exutoire déplacé d’une dizaine de kilomètres en direction d’un barrage et la formation d’annexes hydrauliques favorisant l’accumulation de sédiments dès les années 1940. Ceux-ci ont permis de montrer que le bassin versant de l’Eure avait connu d’importantes contaminations dont les conséquences sont encore enregistrées malgré l’arrêt des activités ou usages. Les tendances temporelles des éléments traces métalliques et métalloïdes ont montré de fortes contaminations en As dans les années 1940 et des contaminations d’origines industrielles en Cr, Co, Ni, Cu, Zn, Ag et Cd durant les années 1960–1970, ainsi que des contaminations en Sb et Pb en 1990–2000. Ces dernières sont toujours enregistrées malgré l’arrêt des activités responsables des rejets, comme l’ont attesté les résultats issus des matières en suspension actuellement collectées dans le cours d’eau. A l’instar d’une majorité des métaux traces, les contaminants organiques, tels les HAPs, ont montré d’importantes contaminations durant les années 1940–1960, dont les signatures indiquent une origine majoritairement pyrogénique. Les PCBs ont montré des contaminations importantes lors de la période 1950–1970, en lien avec la production et les usages nationaux de mélanges composés en majorité de congénères faiblement chlorés. Enfin, l’intérêt porté à une troisième famille de contaminants organiques persistants, les pesticides organochlorés, a montré l’utilisation de lindane et du DDT notamment lors de la période 1940–1970, et a mis en avant d’une part une utilisation post-interdiction du lindane et d’autre part la présence d’un métabolite du DDT plusieurs décennies après l’arrêt d’utilisation de ce dernier, en lien avec l’augmentation de l’érosion des sols cultivés
The anthropogenic impact on rivers has significantly increased following the industrial revolutioninitiated by Western countries. Thus, changes in the geomorphology of rivers for water storage andnavigation, the conversion of land for agricultural, industrial and urbanization purposes illustrate thisenvironmental pressure, which results, among other things, in an increase in discharges of variouscontaminants into environmental compartments, particularly rivers. Therefore, part of these dischargescan end up in suspended particulate matter, which is then considered as storage wells, which transit inrivers. River development, particularly the construction of dams, encourages the sedimentation of these contaminated particles over time. These sediments of anthropogenic origin, also called legacy sediments, are therefore witnesses to human activities and make it possible to reconstruct the temporal trajectories of contamination within watersheds. The Eure River, a major tributary of the Seine estuary, has experienced significant anthropogenic pressures since the twentieth century. The temporal reconstruction of anthropogenic pressures has required the combination of different methodological approaches: (i) a diachronic analysis of the morphological modifications of the river was carried out, in conjunction with (ii) an analysis of the sedimentary dynamics and the nature of the sediment deposits by coupling geophysical, sedimentological and geochemical methods, and (iii) the setting up of a network for monitoring the hydro-sedimentary behaviour with continuous sampling of suspended particulate matter. Significant geomorphological changes have occurred in the lower reaches of the watershed, with the main consequences being an outlet moved some ten kilometres in the direction of a dam and the formation of hydraulic annexes favouring the accumulation of sediments as early as the 1940s. These made it possible to show that the Eure River watershed had experienced significant contamination, the consequences of which are still being recorded despite the cessation of activities or uses. The temporal trends of trace metal and metalloid elements showed strong contaminations in As in the 1940s and contaminations of industrial origin in Cr, Co, Ni, Cu, Zn, Ag and Cd in the 1960s and 1970s, as well as contaminations in Sb and Pb in 1990–2000. The latter are still recorded despite the cessation of the activities responsible for the discharges, as evidenced by the results from the suspended particulate matter currently collected in the river. Like most trace metals, organic contaminants such as PAHs showed significant contamination during the 1940–1960s, with signatures indicating a predominantly pyrogenic origin. PCBs showed significant contamination during the period 1950–1970, in connection with the production and national uses of mixtures composed mainly of low chlorinated congeners. Finally, interest in a third family of persistent organic contaminants, organochlorine pesticides, showed the use of lindane and DDT, particularly during the 1940–1970 period, and highlighted the post-ban use of lindane and the presence of a metabolite of DDT several decades after the cessation of its use, in connection with the increase in erosion of cultivated soils
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Fambrough, Brooke A. „Controls on fluvial longitudinal profile and sediment characteristics predictions from a morphodynamic model /“. 2008. http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-2546/index.html.

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Du, Kuan-Ying, und 杜冠穎. „Neotectonic characteristics of Liuchia fault, southwestern Taiwan, from the analysis of fluvial channel morphology“. Thesis, 2013. http://ndltd.ncl.edu.tw/handle/04255177193576822722.

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碩士
國立臺灣大學
地質科學研究所
101
The Liuchia fault in southwestern Taiwan has been considered as one of the major active faults in the active Taiwan orogen. It is identified by its clear geomorphic features, and forms a major geologic boundary of Taiwan’s Western Foothills. In the twentieth century, several large earthquakes occurred in southwestern Taiwan and caused significant damages. However, there is no unanimous historical evidence for the activity on the Liuchia fault. Therefore, the Liuchia fault poses large hazard potentials for this populous area. Several previous studies have shown that fluvial channel morphology, such as channel slope and width, is strongly influenced by tectonic activities on the assumption of the rock uplift being balanced by the incision of river channels. Base on these hypotheses, it has been shown previously that the analysis of river channel morphology can successfully estimate the activity of potentially active faults in central Taiwan. As a result, we attempted to obtain information of recent activity of the Liuchia fault by analyzing the channel morphology of the Kueichung River, which flows across the fault. We also attempted to calculate the actual river incision rates from the age of river terraces along the river. Such information would enable us to construct the subsurface geometry of this important active structure. We have obtained a detailed river long profile of the Kueichung River from surveys using RTK-GPS, and the channel width profile from actual field measurements using a Laser Rangefinder. The fluvial channel morphology of the Kueichung River appears to have been affected by active folding in the hanging-wall block of the Liuchia fault. Such active deformation pattern is also evident from river incision rate patterns, calculated from the ages and elevations of river terraces along the channel. From the Liuchia fault toward the east, the uplift rate becomes higher, to a highest of 4.6mm/yr at the axis of the Niushan anticline. The uplift rate then becomes lower toward the Chiendapu syncline. The uplift rate pattern indicates the active folding is the uplift mechanism and the fault tip does not extend to the surface yet. We constructed a model of the subsurface geometry of the Liuchia fault, and obtained the trend of dipping angle for the fault plane underneath. Based on this model, we estimated the activity of the Liuchia fault may cause Mw 6.5 earthquakes in the future, and the recurrence interval is about 140yrs. Our results suggest the Liuchia fault has high hazard potential for this populous area, and we need to pay attention to this structure.
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Bücher zum Thema "FLUVIAL CHARACTERISTICS"

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Lowham, H. W. Characteristics of fluvial systems in the plains and deserts of Wyoming. Cheyenne, Wyo: U.S. Dept. of the Interior, U.S. Geological Survey, 1993.

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Gogoi, Swapnali. Advanced Topics on River Study: Fluvio-geomorphological characteristics. LAP Lambert Academic Publishing, 2011.

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Buchteile zum Thema "FLUVIAL CHARACTERISTICS"

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Tal, Michal, Karen Gran, A. Brad Murray, Chris Paola und D. Murray Hicks. „Riparian vegetation as a primary control on channel characteristics in multi-thread rivers“. In Riparian Vegetation and Fluvial Geomorphology, 43–58. Washington, D. C.: American Geophysical Union, 2004. http://dx.doi.org/10.1029/008wsa04.

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Walling, D. E., und P. W. Moorehead. „The particle size characteristics of fluvial suspended sediment: an overview“. In Sediment/Water Interactions, 125–49. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-2376-8_12.

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Poulos, S. E. „An insight to the fluvial characteristics of the Mediterranean and Black Sea watersheds“. In Advances in the Research of Aquatic Environment, 191–98. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-19902-8_22.

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Huang, Huiming, Xiantao Huang, Yuliang Zhu und Siqi Li. „River Regime Evolution of the South Channel in the Changjiang River Estuary, China, During Past 50 Years“. In Lecture Notes in Civil Engineering, 1209–19. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-6138-0_106.

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AbstractAs the middle reach of the Changjiang River Estuary, China, the South Channel’s evolution would directly affected upper and lower reaches. However in recent decades, fluvial water and sediment loads have appeared notable changes, consequently, the latest evolution of the South Channel would adjust either. Hence, topography data of the South Channel in different historical period during past 50 years were adopted, then geomorphology evolution were analyzed in detail. The result showed that river regime of the South Channel had undergone three stages. In the first stage among 1973~1981, it deposited 1.0~9.7 m in central shoal and eroded −1.0~−13.6 m in two side deep channels. In the second stage during 1981~1994, the erosion and sedimentation region turned around, wherein the central shoal eroded −1.0~−9.8 m and two side channels deposited 1.0~10.6 m. In the third stage during 1994~2016, the central shoal partially deposited 1.0~8.1 m and partially eroded −1~−6.1 m, and both side channels eroded −1~−13.2 m. Meanwhile, in the inlet cross section during 1973~2016, location of main channel moved 275 m southward with average elevation changing −1.1 m and the central shoal eroded about −4.6 m. In the middle and outlet cross sections, their central shoal eroded −1.3~−5.8 m and main channel respectively swung 450 m northward with elevation decreasing 0.4 m and 1775 m northward with elevation deepening 6.1 m. Moreover, average elevation of thalwegs changed from −14.0 m to −15.9 m during 1973~2016. Furthermore, evolution characteristics of geomorphology and fluvial water and sediment load in past 50 years showed that there might be close relationship between them.
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Mollah, Swati. „Fluvial Characteristics of Dwarka-Mayurakshi Plain Causing Flood in Kandi Block and Impacts of Manmade Embankments on Riparian Environment“. In Anthropogeomorphology, 395–409. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-77572-8_20.

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Wan, Zhaohui, und Zhaoyin Wang. „Characteristics of fluvial processes associated with hyperconcentrated flow“. In Hyperconcentrated Flow, 189–212. CRC Press, 2020. http://dx.doi.org/10.1201/9781003077671-9.

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Oguchi, T., Y. S. Hayakawa und T. Wasklewicz. „Remote Data in Fluvial Geomorphology: Characteristics and Applications“. In Reference Module in Earth Systems and Environmental Sciences. Elsevier, 2021. http://dx.doi.org/10.1016/b978-0-12-818234-5.00103-6.

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Graf, William L. „Fluvial Sediment, Forms, and Processes“. In Plutonium and the Rio Grande. Oxford University Press, 1995. http://dx.doi.org/10.1093/oso/9780195089332.003.0009.

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Although there are numerous aspects of sediment that might be considered in conjunction with questions related to plutonium transport and storage in rivers, particle size is the critical characteristic. Information on the size distribution of particles in sedimentary deposits connects plutonium, sediment, and river processes. An explanation of the geography of plutonium in the regional river system requires knowledge of particle sizes, the distribution of those particle sizes, and their potential mobility in the regional canyons, rivers, and reservoirs. Some general data concerning the size characteristics of fluvial sediment in the Rio Grande system are available from published sources for a few locations, particularly Los Alamos Canyon. Recent, previously unpublished field and laboratory investigations provide additional detailed information for the changing sedimentary environments associated with the river system. This chapter reviews the characteristics of river sediments in the Northern Rio Grande and presents a regional sediment budget from historical and geographical perspectives. Almost 200 sediment samples from deposits of various ages near the channels of the Rio Grande and tributaries demonstrate the variability of the sediment particle sizes. The analysis had three parts: sample collection, sieving, and electronic particle analysis. In the sample-collection phase, collection sites represented identifiable sedimentary units or channel deposits. Each collection site yielded three samples to indicate local variability. Penetration of the surfaces to depths of 5 to 90 cm with a standard cylindrical soil probe provided masses of about 120 g each for laboratory analysis. Investigators kept only the split of the sample that included those particles with diameters of less than 2 mm (that is, sand size or smaller). Laboratory procedures included sieving and electronic counting. Sieving divided each sample into masses consisting of those particles larger than 63 microns in diameter (the sand fraction) and those smaller than 63 microns (the silt and clay fraction). The weight of each fraction provided a standarized means of comparing the samples for this study and the results reported by other researchers. Analysis of the silt and clay fraction using a Coulter electronic particle analysis system permitted a detailed investigation of the frequency distribution of the particles in this restricted range.
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Carr, Michael H. „Valley Networks“. In Water On Mars, 71–99. Oxford University PressNew York, NY, 1996. http://dx.doi.org/10.1093/oso/9780195099386.003.0004.

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Abstract The valley networks are the most common drainage feature on Mars and the feature most commonly cited as evidence for former warm and wet climatic conditions. Because of their resemblance to river valleys, they have generally been assumed to have formed by fluvial erosion. If formed by fluvial erosion, they imply warm, wet climatic conditions, for under present conditions, small streams would rapidly freeze and prevent development of a network. Since most of the valley networks are old, the former warm and wet conditions are proposed mainly for early in the planet’s history. These interpretations are, however, almost certainly too simplistic and the view of a warm, wet early Mars on which fluvial activity was common, changing early to the cold planet we know today, is likely to be only partly true, if true at all. The resemblance of the valley networks to terrestrial valleys is not exact. River channels, for example, are not observed within the valleys, as would be expected if they were fluvial valleys and other seemingly non-fluvial characteristics must be reconciled with a fluvial origin. In addition, while most of the networks appear to be very ancient, some, cut in young units, must have formed late. Thus, there are reasons to question both a purely fluvial origin and an exclusively old age for the networks. We are on questionable grounds if we invoke warm, wet terrestrial climatic conditions to explain the martian valleys without understanding the reasons for the differences between the terrestrial and martian examples, and also if we invoke wet conditions for the early period of intense network development, while calling upon some other circumstances to explain the younger networks. In this chapter, we examine the characteristics, distribution, ages, and mode of origin of the valley networks and attempt to draw some implications with respect to climate.
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„Characteristics of plunging flows in stepped-channel chutes“. In Fluvial, Environmental and Coastal Developments in Hydraulic Engineering, 17–26. CRC Press, 2004. http://dx.doi.org/10.1201/9780203023396-4.

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Konferenzberichte zum Thema "FLUVIAL CHARACTERISTICS"

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Headley, Rachel, Amy Johnston, Jessica M. Orlofkse, Benjamin Sieren und Christopher D. Tyrrell. „LINKING FLUVIAL SEDIMENTATION CHARACTERISTICS TO LARVAL DRAGONFLY HABITAT“. In Joint 55th Annual North-Central / 55th Annual South-Central Section Meeting - 2021. Geological Society of America, 2021. http://dx.doi.org/10.1130/abs/2021nc-362825.

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Amirshahi, S., C. Winter und E. Kwoll. „Characteristics of instantaneous turbulent events in southern German Bight“. 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/10.1201/9781315644479-32.

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van, R., R. Schielen, A. Blom, M. Kleinhans und S. Hulscher. „Characteristics of side channels in the River Ain, France“. 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/10.1201/9781315644479-39.

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PAN, CUNHONG, AIJU YOU und NINGPING FU. „SOME CHARACTERISTICS OF HILLY AND FLUVIAL MACRO-TIDAL CAO'E ESTUARY“. In Proceedings of the 13th IAHRߝ;APD Congress. World Scientific Publishing Company, 2002. http://dx.doi.org/10.1142/9789812776969_0196.

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Wu, Yihong, Baoligao Bai-Yin, Xiangpeng Mu, Shengzong Xie und Shuang Zheng. „Hydrodynamic characteristics in channel flow with submerged flexible aquatic plants“. 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/10.1201/9781315644479-346.

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Bassie, Abby. „Image-based instrumentation development for measurement of debris flow characteristics“. 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/10.1201/9781315644479-85.

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Okamoto, T., H. Takebayashi, T. Kaneko, Y. Shibayama und K. Toda. „Flood-flow characteristics in a blocked river: Detour flow around a bridge“. 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/10.1201/9781315644479-292.

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Heidari, M., V. Roussinova, R. Balachandar und R. Barron. „Experimental study of wake characteristics of shallow flow past a single cylinder“. 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/10.1201/9781315644479-54.

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Devi, T., und B. Kumar. „A study on the flow characteristics in a finite vegetation patch with downward seepage“. 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/10.1201/9781315644479-127.

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Kean, Jonathan, Alan Cuthbertson und Lindsay Beevers. „Near-bed turbulence characteristics in unsteady hydrograph flows over mobile and immobile gravel beds“. 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/10.1201/9781315644479-283.

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Berichte der Organisationen zum Thema "FLUVIAL CHARACTERISTICS"

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Cole, E. L., M. L. Fowler, S. R. Jackson, M. P. Madden, V. Raw-Schatzinger, S. P. Salamy, P. Sarathi und M. A. Young. Reservoir Characterization, Production Characteristics, and Research Needs for Fluvial/Alluvial Reservoirs in the United States. Office of Scientific and Technical Information (OSTI), April 1999. http://dx.doi.org/10.2172/6081.

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David, Gabrielle C. L., Patrick H. Trier, Ken M. Fritz, Steven L. Kichefski, Tracie-Lynn Nadeau, L. Allan James, Brian J. Topping, Wohl Ellen E. und Aaron Allen. National Ordinary High Water Mark Field Delineation Manual for Rivers and Streams : Interim Version. U.S. Army Engineer Reseach and Development Center, November 2022. http://dx.doi.org/10.21079/11681/46102.

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The ordinary high water mark (OHWM) defines the lateral extent of nontidal aquatic features in the absence of adjacent wetlands in the United States. The federal regulatory definition of the OHWM, 33 CFR 328.3(c)(7), states the OHWM is “that line on the shore established by the fluctuations of water and indicated by physical characteristics such as [a] clear, natural line impressed on the bank, shelving, changes in the character of soil, destruction of terrestrial vegetation, the presence of litter and debris, or other appropriate means that consider the characteristics of the surrounding areas.” This is the first manual to present a methodology for nationwide identification and delineation of the OHWM. A two-page data sheet and field procedure outline a weight-of-evidence (WoE) methodology to organize and evaluate observations at stream sites. This manual presents a consistent, science-based method for delineating the OHWM in streams. It also describes regional differences and challenges in identifying the OHWM at sites disturbed by human-induced or natural changes and illustrates how to use remote data to structure field inquiries and interpret field evidence using the principles of fluvial science. The manual demonstrates that, in many landscape settings, the OHWM may be located near the bankfull elevation.
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Characteristics of fluvial systems in the plains and deserts of Wyoming. US Geological Survey, 1993. http://dx.doi.org/10.3133/wri914153.

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