Готові списки джерел за темами / Floodplain sediments

Добірка наукової літератури з теми "Floodplain sediments"

Автор: Grafiati

Опубліковано: 7 липня 2024

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Статті в журналах з теми "Floodplain sediments":

Martin, Simon, Stefan Klingler, Peter Dietrich, Carsten Leven, and Olaf A. Cirpka. "Structural controls on the hydrogeological functioning of a floodplain." Hydrogeology Journal 28, no. 8 (August 22, 2020): 2675–96. http://dx.doi.org/10.1007/s10040-020-02225-8.

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AbstractFloodplains are often conceptualized as homogeneous sediment bodies which connect streams with their respective catchment and buffer agricultural inputs. This has led to a general bias within the hydrological community towards research on sites where the floodplain is a clear conduit for groundwater flow. In humid temperate regions of central Europe, floodplains have experienced rapid environmental changes since the last glaciation, yielding significant bedrock weathering and predominantly fine-grained, highly stratified hillslope and floodplain sediments. Such heterogeneous sedimentary architecture leads to conceptual ambiguities in the interpretation of the hydrogeological functioning of floodplains, thus raising the question: Do floodplains act as barriers or conduits to groundwater flow? This study analyzes the Ammer floodplain close to Tübingen in south-western Germany as a representative mid-section floodplain in a temperate climate where the regional bedrock-geology is dominated by mudstones. Geological, geophysical, and geochemical characterization and monitoring techniques were combined to shed light on the internal geological structure as a key control modulating the floodplain hydrology. Two partially separate groundwater systems were identified: a gravel body at the bottom of the Quaternary sediments and a Holocene confined tufaceous aquifer, separated by low-permeability clays. Despite flow being predominantly along-valley, sulfate concentrations in the floodplain aquifers showed evidence of a strong connection to the gypsum-bearing hillslope, particularly where tributary valley sediments are present (e.g., alluvial fans). Results from a floodplain water balance suggest the hillslope- and floodplain-aquifer material act as a barrier to hillslope groundwater recharge, where a large fraction may be bypassing the local floodplain groundwater system.

Baldan, Damiano, Matthias Pucher, Elmira Akbari, Thomas Hein, and Gabriele Weigelhofer. "Effects of Two-Stage Ditch and Natural Floodplains on Sediment Processes Driven by Different Hydrological Conditions." Water 13, no. 15 (July 27, 2021): 2046. http://dx.doi.org/10.3390/w13152046.

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The two-stage ditch is a river restoration technique that aims at improving the sediment regime and lateral channel connectivity by recreating a small floodplain alongside a stream reach. This study aimed to analyze the efficiency of a two-stage ditch in improving the stream sediment structure and functions under different hydrological conditions (baseflow, post-bankfull, post-flood). Stream sediments were collected in channel sections adjacent to the two-stage ditch, adjacent to a natural floodplain along channelized reaches without inundation areas. Grain sizes, organic matter content and phosphorous (P) fractions were analyzed along with functional parameters (benthic respiration rate and P adsorption capacity, EPC0). The reach at the two-stage ditch showed no changes in sediment texture and stocks, while the floodplain reach showed higher fines and organic matter content under all hydrological conditions. The sediments in degraded reaches were more likely to be P sources, while they were more in equilibrium with the water column next to the natural floodplains and the two-stage ditch. Only functional parameters allowed for assessing the restoration effects on improving the sediment stability and functionality. Due to its sensitivity, the use of P adsorption capacity is recommended in future studies aiming at evaluating the response of river sediments to restoration measures under different hydrological conditions.

Manh, N. V., B. Merz, and H. Apel. "Sedimentation monitoring including uncertainty analysis in complex floodplains: a case study in the Mekong Delta." Hydrology and Earth System Sciences Discussions 10, no. 1 (January 11, 2013): 325–73. http://dx.doi.org/10.5194/hessd-10-325-2013.

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Abstract. Quantity and quality of sediment deposition in complex floodplains are affected by many uncertain factors, ranging from suspended sediment transport dynamics in rivers and floodplain channel interactions to internal floodplain processes. In consequence, any point measurement of sedimentation in floodplains contains a high degree of uncertainty calling for a careful analysis of the measured data. However, uncertainty analyses are not documented in publications on floodplain sedimentation data. Therefore the presented work illustrates a field sampling strategy aiming at the quantification of uncertainties associated to sediment deposition data, as well as the spatial variability of sediments deposition on floodplains. The study was performed in the Mekong Delta (MD), being an example for a large and complex floodplain with a high degree of anthropogenic disturbances. We present a procedure for the quantification of the uncertainty associated to the data, based on the design of the monitoring campaign and floodplain characteristics. Sediment traps were distributed strategically over the floodplain in clusters of three mat traps representing one monitoring point. The uncertainty originating from collection of the traps in ponding water is quantified by lab experiments. The uncertainty of a single monitoring point is then quantified in a Monte Carlo simulation, propagating the uncertainty from the different uncertainty sources to final uncertainty bounds of the monitored sediment data. For the case study area, it is shown that there are no correlations in the spatial distribution of sedimentation in floodplains. This can be explained by the highly complex channel and dike system and the high number of hydraulic structures. However, it can be shown that within single floodplain compartments the spatial deposition variability depends on the dike levels and operation and location of hydraulic structures.

Kretz, Lena, Katinka Koll, Carolin Seele-Dilbat, Fons van der Plas, Alexandra Weigelt, and Christian Wirth. "Plant structural diversity alters sediment retention on and underneath herbaceous vegetation in a flume experiment." PLOS ONE 16, no. 3 (March 18, 2021): e0248320. http://dx.doi.org/10.1371/journal.pone.0248320.

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Sediment retention is a key ecosystem function provided by floodplains to filter sediments and nutrients from the river water during floods. Floodplain vegetation is an important driver of fine sediment retention. We aim to understand which structural properties of the vegetation are most important for capturing sediments. In a hydraulic flume experiment, we investigated this by disentangling sedimentation on and underneath 96 vegetation patches (40 cm x 60 cm). We planted two grass and two herb species in each patch and conducted a full-factorial manipulation of 1) vegetation density, 2) vegetation height, 3) structural diversity (small-tall vs tall-tall species combinations) and 4) leaf pubescence (based on trait information). We inundated the vegetation patches for 21 h in a flume with silt- and clay-rich water and subsequently measured the amount of accumulated sediment on the vegetation and on a fleece as ground underneath it. We quantified the sediment by washing it off the biomass and off the fleece, drying the sediment and weighting it. Our results showed that all manipulated vegetation properties combined (vegetation density and height, and the interaction of structural diversity and leaf pubescence) explained sedimentation on the vegetation (total R2 = 0.34). The sedimentation underneath the vegetation was explained by the structural diversity and the leaf pubescence (total R2 = 0.11). We further found that vegetation biomass positively affected the sedimentation on and underneath the vegetation. These findings are crucial for floodplain management strategies with the aim to increase sediment retention. Based on our findings, we can identify management strategies and target plant communities that are able to maximize a floodplain’s ability to capture sediments.

Hallberg, Lukas, Faruk Djodjic, and Magdalena Bieroza. "Phosphorus supply and floodplain design govern phosphorus reduction capacity in remediated agricultural streams." Hydrology and Earth System Sciences 28, no. 2 (January 26, 2024): 341–55. http://dx.doi.org/10.5194/hess-28-341-2024.

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Abstract. Agricultural headwater streams are important pathways for diffuse sediment and nutrient losses, requiring mitigation strategies beyond in-field measures to intercept the transport of pollutants to downstream freshwater resources. As such, floodplains can be constructed along existing agricultural streams and ditches to improve fluvial stability and promote deposition of sediments and particulate phosphorus. In this study, we evaluated 10 remediated agricultural streams in Sweden for their capacity to reduce sediment and particulate phosphorus export and investigated the interplay between fluvial processes and phosphorus dynamics. Remediated streams with different floodplain designs (either on one side or both sides of the channel, with different width and elevation) were paired with upstream trapezoidal channels as controls. We used sedimentation plates to determine seasonal patterns in sediment deposition on channel beds and floodplains and monthly water quality monitoring. This was combined with continuous flow discharge measurements to examine suspended sediment and particulate phosphorus dynamics and reduction along reaches. Remediated streams with floodplains on both sides of the channel reduced particulate phosphorus concentrations and loads (−54 µg L−1, −0.21 kg ha−1 yr−1) along reaches, whereas increases occurred along streams with one-sided floodplains (27 µg L−1, 0.09 kg ha−1 yr−1) and control streams (46.6 µg L−1). Sediment deposition in remediated streams was five times higher on channel beds than on floodplains and there was no evident lateral distribution of sediments from channel to floodplains. There was no effect from sediment deposition on particulate phosphorus reduction, suggesting that bank stabilization was the key determinant for phosphorus mitigation in remediated streams, which can be realized with two-sided but not one-sided floodplains. Further, the overall narrow floodplain widths likely restricted reach-scale sediment deposition and its impact on P reductions. To fully understand remediated streams' potential for reductions in both nitrogen and different phosphorus species and to avoid pollution swapping effects, there is a need to further investigate how floodplain design can be optimized to achieve a holistic solution towards improved stream water quality.

Zaharova, Ellina D., and Vladimir R. Belyaev. "Contribution Of The Different Sources To The Formation Of Alluvial Sediments In The Selenga River Delta. (Eastern Siberia, Russia)." GEOGRAPHY, ENVIRONMENT, SUSTAINABILITY 15, no. 4 (January 18, 2023): 222–31. http://dx.doi.org/10.24057/2071-9388-2022-098.

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Unraveling sources of sediment supply, their temporal and spatial variability is of key importance to determine origin of deposits and to explore the formation mechanism of Selenga Delta landscape units. From an environmental point of view this solution would help to identify the particle-bound pollution sources. We used geochemical fingerprinting (the FingerPro R package), which is a modern quantitative implementation of the method of sedimentary provenance analysis. The main aim was to recognize the main patterns of sediment and associated particle-bound pollutants transport and deposition within the delta. At the old floodplain from 55% to 90% of sediments were delivered from the eroded floodplain and terrace banks upstream and only about 10-15% originates from the remote basin sources. Sedimentary environment in the Khlystov Zaton reveals a greater variety than on the floodplains. 40% of sediments from the upper 5 cm-layer originated from the flood, taking place in 2013, and 30% were the product of floodplain and terraces banks erosion. Nevertheless, analysis of the fine-grained component of suspended sediment sets the material from eroded floodplain banks as the dominant source of accumulation within the delta. This means that the self-absorption is the leading process in the Selenga delta at the moment. Heavy metals and metalloids accumulates in the lower reaches of the Selenga on the floodplain surface, deltaic lakes and oxbows during high floods. Runoff decrease during floods can lead to the release of pollutants into the Lake Baikal.

Jílek, Pavel, Jaroslava Melková, Eliška Růžičková, Jan Šilar, and Antonín Zeman. "Radiocarbon Dating of Holocene Sediments: Flood Events and Evolution of the Labe (Elbe) River in Central Bohemia (Czech Republic)." Radiocarbon 37, no. 2 (1995): 131–37. http://dx.doi.org/10.1017/s0033822200030563.

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We studied the structure and development of the Holocene floodplain of the Labe (Elbe) River by radiocarbon dating sections of the upper and middle courses of the river. We focused on geomorphological and sedimentological conditions, mineralogy and the chemical composition of sediments. We established the stratigraphy of the Holocene deposits of the floodplain. The results of our investigation of fluvial sediments imply that several abrupt changes in temperature and precipitation occurred during the Holocene. These changes led to intervals of hydrological disequilibrium, which caused the formation of two Holocene terraces and a contemporaneous floodplain. The lower terrace was flooded and covered with sediments upon which the recent floodplain formed. During the Holocene, there were four periods during which large tree trunks were deposited in the fluvial sediments, indicating periods of extensive flooding. The supposition that these events were of more global scale is supported by the results of investigations made on the Holocene floodplains of other regions.

Notebaert, B., G. Houbrechts, G. Verstraeten, N. Broothaerts, J. Haeckx, M. Reynders, G. Govers, F. Petit, and J. Poesen. "Fluvial architecture of Belgian river systems in contrasting environments: implications for reconstructing the sedimentation history." Netherlands Journal of Geosciences - Geologie en Mijnbouw 90, no. 1 (August 2011): 31–50. http://dx.doi.org/10.1017/s0016774600000652.

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AbstractAccurate dating is necessary to get insight in the temporal variations in sediment deposition in floodplains. The interpretation of such dates is however dependent on the fluvial architecture of the floodplain. In this study we discuss the fluvial architecture of three contrasting Belgian catchments (Dijle, Geul and Amblève catchment) and how this influences the dating possibilities of net floodplain sediment storage. Although vertical aggradation occurred in all three floodplains during the last part of the Holocene, they differ in the importance of lateral accretion and vertical aggradation during the entire Holocene. Holocene floodplain aggradation is the dominant process in the Dijle catchment. Lateral reworking of the floodplain sediments by river meandering was limited to a part of the floodplain, resulting in stacked point bar deposits. The fluvial architecture allows identifying vertical aggradation without erosional hiatuses. Results show that trends in vertical floodplain aggradation in the Dijle catchment are mainly related to land use changes. In the other two catchments, lateral reworking was the dominant process, and channel lag and point bar deposits occur over the entire floodplain width. Here, tracers were used to date the sediment dynamics: lead from metal mining in the Geul and iron slag from ironworks in the Amblève catchment. These methods allow the identification of two or three discrete periods, but their spatial extent and variations is identified in a continuous way. The fluvial architecture and the limitation in dating with tracers hampered the identification of dominant environmental changes for sediment dynamics in both catchments. Dating methods which provide only discrete point information, like radiocarbon or OSL dating, are best suited for fluvial systems which contain continuous aggradation profiles. Spatially more continuous dating methods, e.g. through the use of tracers, allow to reconstruct past surfaces and allow to reconstruct reworked parts of the floodplain. As such they allow a better reconstruction of past sedimentation rates in systems with important lateral reworking.

ŠORŠA, Ajka, Teja ČERU, Zsófia KOVÁCS, Gyozo JORDAN, Katalin Mária DUDÁS, and Peter SZABÓ. "ASSESSMENT OF RIVER SEDIMENT QUALITY ACCORDING TO THE EU WATER FRAMEWORK DIRECTIVE IN LOWLAND FLUVIAL CONDITIONS. A CASE STUDY IN THE DRAVA RIVER AREA, DANUBE RIVER BASIN." Carpathian Journal of Earth and Environmental Sciences 17, no. 2 (August 31, 2022): 459–68. http://dx.doi.org/10.26471/cjees/2022/017/235.

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The EU Water Framework Directive requires the monitoring and evaluation of surface water sediment quality based on the assessment of risk posed by contamination on the biotic receptors. Fluvial sediments are important receptors of hazardous substances (HSs) pollution from the upstream catchment areas in the Danube River Basin (DRB). For the development of systematic sediment quality monitoring and evaluation, the Drava River region on the border of Hungary and Croatia was selected as a test area representative of lowland hydromorphological conditions. Overbank (floodplain) sediments and river bottom sediments (stream sediments) were sampled at two depths at 9 locations in the test area. Eight heavy metal(oid)s were analyzed As, Cd, Cr, Cu, Hg, Ni, and Zn as hazardous substances. The sediment quality assessment was carried out according to the 2013/39/EU Directive and EU Water Framework Directive standards. Most of the analysed HS concentrations in river bottom sediment and overbank (floodplain) sediments fall within the limits of environmental quality standards (EQS). Results show that there is no significant differences in metal(oid) HS concentrations among the various sediment types and between shallow (0-5cm) and deeper (stream sediment: 5-10cm; floodplain sediment: 40-50cm) sediment which suggests that the large lowland Drava River fluvial system is an extensive single fluvial system with homogeneous distribution of sediments and the associated contaminants. Specifically, the studied sediments in the tributaries of the Drava River do not seem to be contaminated with metal(oid) hazardous substances but at certain sites concentrations are elevated above the environmental limit values, especially for As and Zn, and to lesser extent for Cr. The data analysis techniques used enabled the identification of sites with anthropogenic pollution and the recognition of regional pattern in HSs distribution.

Berger, Glenn W., and Don J. Easterbrook. "Thermoluminescence dating tests for lacustrine, glaciomarine, and floodplain sediments from western Washington and British Columbia." Canadian Journal of Earth Sciences 30, no. 9 (September 1, 1993): 1815–28. http://dx.doi.org/10.1139/e93-160.

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To help further develop reliable procedures for accurate thermoluminescence (TL) dating of Quaternary waterlaid sediments, we tested TL dating procedures on sediment types rarely examined: six glaciolacustrine samples, three samples of glaciomarine drift, and eight samples of floodplain deposits. We used the partial-bleach (R-beta/gamma) technique applied to fine-silt polymineral grains. Results from our younger known-age glaciolacustrine sediments confirm earlier observations that only the clayey laminae are generally suitable for TL dating. A clayey lamina older than ca. 140 – 150 ka produced no age underestimation, and this result (ca. 300 ka) suggests that such older lake sediments are probably suitable for TL dating. Two proximal samples of glaciomarine drift produced large TL age overestimates, whereas the single distal glaciomarine-drift sample yielded an expected age (177 ± 38 ka), suggesting that follow-up studies are warranted. Our results for eight flood-plain samples confirm that zeroing of light-sensitive TL is more likely to be effective for sediments deposited in quiet, ponded water on the floodplain than for proximal sediments deposited from turbid floodwater. TL age estimates for floodplain sediments of the regional Whidbey Formation are consistent with its expected last-interglacial age, and those for two samples from stratigraphically older beds are consistent with deposition near or beyond 200 ka. Two of our younger samples (one lacustrine and one floodplain) gave TL age underestimates, perhaps because of use of ultraviolet TL emissions for these samples.

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Дисертації з теми "Floodplain sediments":

Denys, Frank. "Transverse transport of suspended sediment across the main channel - floodplain shear boundary /." Link to the online version, 2007. http://hdl.handle.net/10019/415.

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Denys, Frank. "Transverse transport of suspended sediment across the main channel – floodplain shear boundary." Thesis, Stellenbosch : University of Stellenbosch, 2006. http://hdl.handle.net/10019.1/2602.

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Thesis (MScEng (Civil Engineering))--University of Stellenbosch, 2006.
The floodplain of a river forms a close relationship with the stream that created it. Not only does the river influence the characteristics of the floodplain, the floodplain can also very easily influence its river, as is evidenced by examples such as the Huang He River in China and the Columbia River in Canada. These two cases clearly indicate that suspended sediment has a pronounced influence on the floodplain. This thesis investigates the processes which cause sediment to move onto the floodplain. As observed in many rivers worldwide suspended sediment on the floodplain has a tendency to settle near but not directly next to the main river channel. This gap between the river channel and the location of highest sedimentation rate stems from the fact that there is a zone of relatively higher turbulence at the boundaries of the floodplain. Close to this zone flow on the floodplain is increased in velocity whilst the flow velocity in the main channel is decreased as can be seen in the figure below: ...

Zhao, Yingkui. "Heavy metal distribution in floodplain sediments of the river Severn, UK." Thesis, University of the West of England, Bristol, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327475.

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He, Qingping. "Interpretation of fallout radionuclide profiles in sediments from lake and floodplain environments." Thesis, University of Exeter, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358000.

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Alderson, Danielle. "The fate of carbon in upland floodplain sediments : a combined geomorphological and organic geochemical approach." Thesis, University of Manchester, 2018. https://www.research.manchester.ac.uk/portal/en/theses/the-fate-of-carbon-in-upland-floodplain-sediments-a-combined-geomorphological-and-organic-geochemical-approach(fb0b0de9-6906-4000-9d1d-897c382ca479).html.

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As conveyors of water and sediment, rivers play an instrumental role in landscape evolution (Turner et al., 2015). River systems were traditionally considered as passive pipes of terrestrial organic carbon (OC), but are now viewed as active sites of OC processing, redistribution and storage (Aufdenkampe et al., 2011). Floodplains are an important part of this system and have the capacity to act as sources or sinks of carbon (Zehetner et al., 2009), but most importantly active hotspots of organic matter (OM) transformation (Hoffmann et al., 2009; Zocatelli et al., 2013). POC eroded from highly-organic peat soils, may be interrupted in its transport through the fluvial system, by temporary storage on floodplain landforms (Evans and Warburton, 2005; Evans et al., 2006). It is important to investigate the fate of fluvial peatland POC, in order to fully close the terrestrial peatland carbon budget, to account for subsequent mineralisation and explore the processes that lead to redistribution and storage. The River Ashop in the southern Pennines, UK, drains the slopes of both Bleaklow and Kinder Scout which are upland plateaux, which support an extensive cover of blanket peat (Evans and Lindsay, 2010). These peatlands have been severely eroded and are vulnerable to future erosion as they are marginal to the climatic space suitable for growth of peat bogs in the UK (Clark et al., 2010). The wider peatland catchment features cohesive, organic-rich floodplains, which are atypical in an upland landscape, and thus suitable for investigation in their role in the fate of eroded carbon. OM quality was an important focus of this research into the redistribution of terrestrial organic carbon. As such, OM quality was conceptualised, by identifying how different research disciplines identify with the term, and ultimately providing a classification scheme to assist individuals in their exploration of OM character. A novel approach using ITRAX core scanning data was used to establish carbon stocks of floodplains in the River Ashop catchment. Sedimentological characteristics were insufficient to distinguish between allochthonous and autochthonous organic matter storage. However, dating was used as a rapid and accurate tool to assess carbon source on the 'off-site' floodplain, and could perhaps be used in the wider environment where there are large discrepancies between the ages of source materials. Investigations into the OM quality, provided suitably convincing evidence that substantial overbank deposition of eroded 'old' peat had occurred. Despite this, viewing these sites simply as areas of carbon storage is misleading. In fact, these systems have potentially been turning over substantial quantities of carbon to the atmosphere. Contextual information from modern-day fluvial POC fluxes showed that both 'off-site' and 'on-site' floodplains only play a minor role in storing carbon. Geomorphological events, particularly the substantial sediment flux generated from peatland erosion were critical in the formation of these floodplains. In these peatland systems, erosion, deposition and turnover of carbon are intimately linked at the landscape scale, and floodplains are a dynamic component of this system.

Vandeberg, Gregory Scott. "The distribution of trace elements in floodplain soils and sediments of the upper Blackfoot River, Montana /." Search for this dissertation online, 2005. http://wwwlib.umi.com/cr/ksu/main.

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Michel, James T. Helfield James M. "Seed rain and selected species germination and growth trials : implications for natural and augmented revegetation of post-dam Elwha River floodplain and reservoir sediments /." Online version, 2010. http://content.wwu.edu/cdm4/item_viewer.php?CISOROOT=/theses&CISOPTR=361&CISOBOX=1&REC=5.

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Bechtold, James Scott. "Fluvial sediment influences on floodplain soil biogeochemistry /." Thesis, Connect to this title online; UW restricted, 2007. http://hdl.handle.net/1773/5358.

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Euzen, Cassandra. "Reconstruction spatio-temporelle des dépôts métalliques le long d'un hydrosystème fluvial fortement anthropisé : combinaison d'approches géochimiques, hydrogéomorphologiques et géochronologiques appliquée au Rhin supérieur." Electronic Thesis or Diss., Strasbourg, 2023. http://www.theses.fr/2023STRAH006.

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Connaitre l'évolution temporelle de la composition chimique des rivières fortement anthropisées est essentiel pour évaluer l'impact des activités humaines et des mesures de réduction de la pollution. La plupart des contaminants s'associant aux sédiments fins, l'analyse géochimique de dépôts sédimentaires bien datés formés dans les plaines inondables peut permettre de reconstruire la trajectoire des fleuves sur plus d’un siècle. Dans ce cadre, cette thèse a eu pour objectif de reconstruire, à partir d’archives sédimentaires, l’évolution des émissions humaines en métaux dans le Rhin supérieur. Plus précisément, une première partie s’est intéressée à la datation robuste et précise des sédiments déposés durant les 200 dernières années à partir d’une analyse multiméthodes (anciennes cartes, hydrologie, datation par luminescence, 137Cs, 210Pbxs). Une séquence sédimentaire longue et continue a ensuite été étudiée pour reconstruire les impacts humains historiques en métaux sur le Rhin. Enfin, la variabilité spatiale de l’enregistrement des contaminations historique a été étudiée entre Bâle et Strasbourg grâce à plusieurs archives sédimentaires
Understanding the temporal evolution of the geochemical composition of heavily impacted rivers is crucial for assessing the impact of human activities and measures to reduce river pollution. To this end and since most contaminants are associated with suspended load, geochemical analysis of well-dated floodplain sedimentary deposits can allow reconstructing the chemical trajectory of rivers over a century or more. This thesis aimed to reconstruct the historical metal emissions in the Rhine by studying its sedimentary archives. Specifically, the first part of the work focused on robust and precise dating of sediments deposited during the last 200 years using a combination of historical planimetric (old maps) and hydrological data with geochronological dating (single grain IRSL, 137Cs, 210Pbxs). Subsequently, the work focused on a long and continuous sedimentary sequence to reconstruct historical metal emissions in the Rhine. Finally, the spatial variability of the historical contamination record was studied between Basel and Strasbourg using several sedimentary archives

Ahmed, Joshua. "Sediment-triggered migration and floodplain habitat development in meandering rivers." Thesis, Cardiff University, 2017. http://orca.cf.ac.uk/105765/.

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Meandering rivers create some of the most intricate and diverse regions on the planet. Lateral migration excavates floodplain material from the outer banks of meanders and subsequently deposits it at the hydrodynamically calmer inner bank region, creating point bars. Point bars are constructed by the progressive attachment of sediment in the form of scroll bar deposits: sediment shoals up and becomes deposited on the margins of the bar, increasing its aerial extent, which becomes stabilised by vegetation once regular inundation ceases. Point bars have the potential to affect flow as it is routed through the meander by both increasing the curvature of the bend and topographically forcing water to flow outwards, increasing boundary shear stress and rates of bank erosion. A combination of remotely-sensed data, GIS, and a 2D morphodynamic flow model was used to examine the role of externally-imposed sediment supply on point bar growth and floodplain evolution in the Amazon Basin. Externally-derived sediment supply is important since it provides the material used to build point bars – of course supplemented by internal sediment sources. A simulated reach on the Sacramento River, USA was used to investigate the role of increased sediment supply on bar growth and meander evolution through time. It is demonstrated that rivers characterised by high sediment loads have greter migration rates, rates of cutoff production, and larger populations of oxbow lakes driven by the maintenance of a steady-state sinuosity on the rivers through time. Channel sinuosity increases with migration rate, although the rate of sinuosity increase is determined by the type of meander deformation: downstream translating bends increase their length more quickly than their upstream translating or extensional counterparts. Point bar growth was observed to occur under high sediment loading conditions when modelled using a 2D morphodynamic model. The bar sequestered sediment at the upstream head of the bar causing it to grow ii upstream. This increased the distance of outer bank subjected to bank erosion and also increased to magnitude of bank erosion. a sediment-driven control on sinuosity increases manifested through bend deformation style, and the simulated growth of point bars in the presence of enhanced sediment loading which resulted in increased rates of bank erosion. These results are of significance for meandering theory and particularly indicate the importance of point bars in effecting the morphodynamic evolution of meandering rivers.

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Книги з теми "Floodplain sediments":

Rathore, D. S. Floodplain mapping in a part of Yamuna river. Roorkee: National Institute of Hydrology, 1997.

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Thonon, Ivo. Deposition of sediment and associated heavy metals on floodplains. Utrecht: Koninklijk Nederlands Aardrijkskundig Genootschap, Faculteit Geowetenschappen Universiteit Utrecht, 2006.

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Wilding, C. T. Heavy metal contamination of channel sediments and floodplain soils downstream of a former mining district on the Isleof Man. Wolverhampton: University of Wolverhampton, 1994.

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R, Somma, and Geological Survey (U.S.), eds. Pb isotopes and toxic metal abundances in the floodplain and stream sediments from the Volturno River Basin (Campania, Italy): Natural and anthropogenic contributions. Reston, VA: U.S. Dept. of the Interior, U.S. Geological Survey, 1999.

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S, Redmond Anjela, Sparks Richard E, and Environmental Management Technical Center (U.S.), eds. Impacts of settlement on floodplain vegetation at the confluence of the Illinois and Mississippi Rivers. Onalaska, Wis: National Biological Survey, Environmental Management Technical Center, 1995.

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B, Marriott Susan, Alexander Jan 1962-, and Geological Society of London, eds. Floodplains: Interdisciplinary approaches. London: Geological Society, 1999.

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Demissie, Misganaw. Sediment load during flood events for Illinois streams. Onalaska, Wis: National Biological Survey, Environmental Management Technical Center, 1995.

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Thonon, Ivo. Deposition of sediment and associated heavy metals on floodplains. Utrecht: Koninklijk Nederlands Aardrijkskundig Genootschap, 2005.

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Rudiš, Miroslav. Effect of polluted sediments settled in flood plains on environment and ground water. Prague: T.G. Masaryk Water Research Institute, Public Research Institution, 2008.

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Rudiš, Miroslav. Effect of polluted sediments settled in flood plains on environment and ground water. Prague: T.G. Masaryk Water Research Institute, Public Research Institution, 2008.

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Частини книг з теми "Floodplain sediments":

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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Leenaers, H. "Sequential Extraction of Heavy Metals from Floodplain Sediments." In Contaminated Soil ’90, 383–84. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-011-3270-1_82.

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Walling, D. E., and P. N. Owens. "The role of overbank floodplain sedimentation in catchment contaminant budgets." In The Interactions between Sediments and Water, 83–91. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-017-3366-3_13.

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He, Q., and D. E. Walling. "Spatial Variability of the Particle Size Composition of Overbank Floodplain Deposits." In The Interactions Between Sediments and Water, 71–80. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5552-6_8.

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Van Koetsem, Frederik, Jörg Rinklebe, and Gijs Du Laing. "Analysis and Fate of Metal-Based Engineered Nanoparticles in Aquatic Environments, Wetlands, and Floodplain Soils." In Trace Elements in Waterlogged Soils and Sediments, 101–33. Boca Raton: CRC Press, 2016. http://dx.doi.org/10.1201/9781315372952-7.

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Owens, Philip N., and Desmond E. Walling. "Temporal changes in the metal and phosphorus content of suspended sediment transported by Yorkshire rivers, U.K. over the last 100 years, as recorded by overbank floodplain deposits." In The Interactions between Sediments and Water, 185–91. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-017-3366-3_25.

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Walling, D. E., and Q. He. "Investigating Spatial Patterns of Overbank Sedimentation on River Floodplains." In The Interactions Between Sediments and Water, 9–20. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5552-6_2.

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Sweet, R. J., A. P. Nicholas, D. E. Walling, and X. Fang. "Morphological controls on medium-term sedimentation rates on British lowland river floodplains." In The Interactions between Sediments and Water, 177–83. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-017-3366-3_24.

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Ripl, Wilhelm. "Restoration of Eutrophic Lakes by Sediment Treatment." In Restoration of Lakes, Streams, Floodplains, and Bogs in Europe, 77–84. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-9265-6_6.

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Björk, Sven, Jan Pokorný, and Václav Hauser. "Restoration of Lakes Through Sediment Removal, with Case Studies from Lakes Trummen, Sweden and Vajgar, Czech Republic." In Restoration of Lakes, Streams, Floodplains, and Bogs in Europe, 101–22. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-9265-6_8.

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Тези доповідей конференцій з теми "Floodplain sediments":

Ishman, Scott, and Stephanie Jarvis. "EVIDENCE OF TESTATE AMOEBAE IN MIDDLE MISSISSIPPI RIVER FLOODPLAIN SEDIMENTS." In GSA Connects 2022 meeting in Denver, Colorado. Geological Society of America, 2022. http://dx.doi.org/10.1130/abs/2022am-378249.

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Maher, Ryan Michael. "IDENTIFYING TRACE ELEMENT CHRONOLOGICAL MARKERS WITHIN UPPER MISSISSIPPI RIVER FLOODPLAIN-SEDIMENTS." In 52nd Annual North-Central GSA Section Meeting - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018nc-313035.

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Lo, Edward, Chris Matocha, Sidney Kuerten, Aguinaldo Silva, Romullo O. Louzada, and Michael M. McGlue. "CLAY MINERAL COMPOSITION OF MODERN SEDIMENTS IN THE PANTANAL FLOODPLAIN, BRAZIL." In Joint 56th Annual North-Central/ 71st Annual Southeastern Section Meeting - 2022. Geological Society of America, 2022. http://dx.doi.org/10.1130/abs/2022nc-374942.

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Jordan, Miranda, Robert T. Pavlowsky, and Marc Owen. "STRATIGRAPHIC RECORD OF LEGACY SEDIMENTS IN FLOODPLAIN DEPOSITS ALONG BIG RIVER, MISSOURI OZARKS." In GSA Annual Meeting in Indianapolis, Indiana, USA - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018am-323781.

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Kulkarni, Harshad, Thomas Varner, Deeksha Kumari, Anand Giri, Peter S. K. Knappett, and Saugata Datta. "INVESTIGATING GEOCHEMICAL PROCESSES IN SEDIMENTS OF HIMALAYAN TRIBUTARIES TO ARSENIC-CONTAMINATED FLOODPLAIN AQUIFERS." In GSA Connects 2023 Meeting in Pittsburgh, Pennsylvania. Geological Society of America, 2023. http://dx.doi.org/10.1130/abs/2023am-394419.

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Dewey, Christian, Patricia Fox, Dipankar Dwivedi, Carolyn Anderson, Hannah Naughton, Marco Keiluweit, Shawn Benner, Peter Nico, and Scott Fendorf. "Assessing Controls of Carbon and Sulfur Fluxes in High Elevation Floodplain Sediments Under Transient Hydrologic Conditions." In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.565.

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Huot, Sebastien, Ciara Fleming, Jonathan Turner, and Mary Bourke. "OPTICALLY STIMULATED LUMINESCENCE DATING OF POSTGLACIAL FLOODPLAIN SEDIMENTS IN IRELAND: IT IS LIKE ASSEMBLING A JIGSAW PUZZLE!" In Joint 53rd Annual South-Central/53rd North-Central/71st Rocky Mtn GSA Section Meeting - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019sc-327423.

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Skliar, Iurii, Viktoriia Skliar, Maryna Sherstiuk, and Inna Zubtsova. "DIMENSIONAL CHARACTERISTICS OF NYMPHOIDES PELTATA (S.G. GMEL.) KUNTZE IN DIFFERENT ECOLOGICAL AND CENOTIC CONDITIONS OF THE BASIN'S WATER BODIES DESNA RIVER (UKRAINE)." In 23rd SGEM International Multidisciplinary Scientific GeoConference 2023. STEF92 Technology, 2023. http://dx.doi.org/10.5593/sgem2023v/3.2/s12.13.

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Nymphoides peltata is a typical representative of higher aquatic plants. Despite its wide geographical distribution, N. peltata is a rather rare species. The development of effective measures to protect a species in any territory is possible only if there is complete information on the status of its populations. Study of the size and morphological structure of plants plays an important role in the system of population studies. The purpose of this publication is to characterise the dimensional values of N. peltata plants growing in the waters of the Desna River basin and to assess the impact of the leading ecological and coenotic factors on them. Five N. peltata cenopopulations were studied. Morphometric analysis was used, which was accompanied by the recording of 12 static metric morphoparameters. The results of the study showed that N. peltata plants respond to changes in ecological and cenotic conditions with a statistically significant change in the values of the leading morphological parameters and total size. As a result, plants of a characteristic habit and morphostructure are formed in each habitat. Based on the results of the study of plant size and the assessment of the influence of the leading ecological and coenotic factors, it was found that the most favourable for the formation, growth and development of N. peltata coenopopulations are large floodplain lakes, which are characterised by the following set of indicators: no current, water depth of 30�80 cm, transparency of at least 75�80% of the maximum depth, muddy bottom sediments, and projective coverage of the species of 70�95%. The habitats of the Nymphoides peltata subpurum (floodplain lake) and Nymphoides peltata�Ceratophyllum demersum (floodplain lake) communities most closely correspond to the parameters of the ecological and cenotic optimum.

Tigar, Aaron D., Raymond H. Johnson, Michael S. Bradley, and Kara Tafoya. "COMPARISON OF COLUMN LEACHING RATES ON CONTAMINANT RELEASE FROM RIVER FLOODPLAIN SEDIMENTS AT A FORMER URANIUM MILL SITE." In GSA Annual Meeting in Phoenix, Arizona, USA - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019am-334437.

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Rasmussen, Anna, Chris Francis, Kristin Boye, John Bargar, and Bradley Tolar. "Genome-based approach for assessing microbial community dynamics and genetic potential reveals diverse methylotrophs in Slate River floodplain sediments." In Goldschmidt2023. France: European Association of Geochemistry, 2023. http://dx.doi.org/10.7185/gold2023.18663.

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Звіти організацій з теми "Floodplain sediments":

Yeager, Kevin M. Floodplain sedimentology and sediment accumulation assessment – Savannah River Site. Office of Scientific and Technical Information (OSTI), January 2016. http://dx.doi.org/10.2172/1234549.

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Harris, Aubrey, and Darixa Hernandez-Abrams. Monitoring geomorphology to inform ecological outcomes downstream of reservoirs affected by sediment release. Engineer Research and Development Center (U.S.), May 2024. http://dx.doi.org/10.21079/11681/48470.

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Increasingly, reservoir managers are seeking techniques that improve sediment management while considering long-term sedimentation and reduced operational flexibility. These techniques, often termed sustainable sediment management, involve passing sediment through reservoirs and into downstream rivers. Conceptually, restoring sediment continuity can benefit ecosystem function by increasing floodplain connectivity, contributing to the heterogeneity of channel geomorphology, and supporting the continuity of nutrient cycling. However, when a change is made to operations, geomorphic changes may need to be monitored to document benefits and mitigate any unexpected effects of the change. This investigation develops a geomorphic monitoring plan for downstream reaches affected by sediment-release operations at reservoirs. The monitoring objectives are aligned with potential geomorphic change caused by changes to sediment supply and the associated effects on river function. A tiered approach is presented to explain the quality of information that can be assessed from increasing levels of data collection. A general conceptual model is described in which geomorphic data may be linked to physical habitat conditions and, therefore, ecological processes. The geomorphic monitoring plan for the Tuttle Creek Reservoir water injection dredging (WID) pilot project is presented as a case study. This technical note establishes a general framework for monitoring the design for sustainable sediment management in different ecological and geomorphic contexts.

Livensperger, Carolyn, Rebecca Weissinger, Luke Gommermann, and Alice Wondrak Biel. Riparian monitoring of wadeable streams on the Fremont River, Capitol Reef National Park, 2009?2021. National Park Service, 2023. http://dx.doi.org/10.36967/2301391.

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The goal of Northern Colorado Plateau Network (NCPN) riparian monitoring is to deter-mine long-term trends in hydrologic, geomorphic, and vegetative properties of wadeable streams in the context of changes in other ecological drivers, stressors, and processes. This information is intended to provide early warning of resource degradation and determine natural variability of wadeable streams. This report summarizes NCPN monitoring of the Fremont River in Capitol Reef National Park (NP) from water years 2009 to 2021. The focus of this report is to (1) examine patterns in water availability at one monitoring reach from 2010 to 2021, and (2) present geomorphology and vegetation data from four reaches monitored from 2009 to 2021. Vegetation sampling and geomorphology surveys were completed at varying intervals throughout the time period; this report looks at changes within single reaches and establishes a baseline for future comparisons. There are four monitoring reaches established on the Fremont River: (1) F-01, approximately 2.5 kilometers upstream of a knickpoint (sharp change in channel slope) and associated waterfall that emerged following construction of State Highway 24 in 1964, (2) F-07, in a large oxbow that was cut off due to the highway construction, (3) F-04, approximately 1.5 kilometers downstream of the knickpoint, and (4) F-14, approximately 4.8 kilometers downstream of the knickpoint. Geomorphic and vegetation surveys took place at all reaches. Hydrologic monitoring occurred only at F-01. From 2001 to 2021, the entire range of flows recorded at a gaging station on the Fremont River upstream of the park near Bicknell, Utah, decreased, with the steepest decreases occurring in the highest flow percentiles. Continuous hydrologic monitoring at reach F-01 in the park from 2010 to 2021 showed perennial flows in the Fremont River, with lower flows during the irrigation season (April 1?October 31). The irrigation season was also characterized by greater evapotranspiration, which may be exacerbated in the future due to higher air temperatures. Lower observed inputs and greater evapotranspiration suggest the Fremont River is at risk for progressively lower flows over time. While overbank flows occurred infrequently in the monitoring reach, inhibiting cottonwood recruitment, groundwater levels remained shallow enough to support mature cottonwood trees. Protecting spring snowmelt flows of 94 cfs (the average annual maximum 14-day rolling mean at reach F-01), or greater should maintain the current wetland vegetated zone. Maintaining the hydrologic record was challenging due to high-magnitude flood events and turbid flows; the park should consider a gaging station for an accurate discharge record. Geomorphic surveys showed net sediment deposition at reaches F-01 and F-14 in the channels, banks, and floodplains from 2009 to 2021, with more deposition occurring earlier in the study period. A large flood event in 2013 resulted in high flows and deposition of close to one meter at F-01. Only localized erosion occurred, and thalweg surveys showed that stream channels were either stable or increasing in elevation. Reach F-07, the abandoned oxbow, exhibited little geomorphic change over the study period. Riparian vegetation was characteristic of a Fremont cottonwood woodland, with canopy closure up to 30% and a mixed understory of shrubs and herbaceous species. Obligate wetland vegetation cover of 5%?10% was present at reaches F-01, F-04, and F-14. Reach F-07, in the oxbow, has transitioned to an upland system, with little to no canopy cover and no obligate wetland species. While mature cottonwoods were present in reaches F-01, F-04, and F-14, there was limited evidence of seedlings or saplings graduating into larger size classes. Cottonwood seedlings are primarily resprouts from beaver-browsed trees, although one seedling recruitment event was observed in 2014, following high flows in late 2013. Protecting some cottonwoods with chicken wire may help protect the larger size classes and maintain a mixed-age woodland. Exotic plant species cover was less than 10% in reaches F-01, F-04, and F-14. Efforts to control Russian olive (Eleagnus angustifolia) along the Fremont River appear to have been successful in these reaches. In reach F-07, exotic plant cover ranged from 9% to 25%, with notable spikes in Russian thistle (Salsola tragus) and cheatgrass (Bromus tectorum) in 2010 and 2011, respectively.