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Letteratura scientifica selezionata sul tema "Lake sediments"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 31 luglio 2024

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Articoli di riviste sul tema "Lake sediments"

1

Pujate, Agnese, Karina Stankevica, Laimdota Kalnina, Maris Klavins, Aija Cerina, Anda Drucka e Kristaps Kiziks. "Records of the anthropogenic influence on different origin lake sediments of Latvia". Baltica 28, n. 2 (11 dicembre 2015): 135–50. http://dx.doi.org/10.5200/baltica.2015.28.12.

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Sediments in lakes have formed under the conditions of sensitive ecosystem functions as archives of micro- and macrocomponents. Besides others, lake sediments preserve palaeobotanical and chemical evidence reflecting environmental changes. During the last centuries, sediment composition has been influenced also by inconsistent urban and industrial developments. This paper represents the results of chemical and palaeobotanical signatures in the sediments from four lakes of different origin: Lake Lilaste, Lake Velnezers, Lake Engure, and Lake Vevers. The data were compared with the results from sediment composition analysis obtained by Loss on Ignition and chemical methods taking into account changes in plant macroremains. The studies of lake sediments revealed that human impact is recognisable in the upper sediment layer of all investigated sites, but at different depth from sediment surface. The most recognisable traces of anthropogenic influence can be attributed to the sharp increase of the amount of lead (Pb) and number of plant macroremains in analysed lake sediments.

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2

Wu, Chao, Xiaodong Wu, Xuguang Ge, Lian Feng, Ya Tan, Jiuyun Yang, Weixiang Ren e Min Zou. "Characteristics of Dissolved Organic Matter in Sediments of Typical Lakes in Southeastern Hubei Province, China". International Journal of Environmental Research and Public Health 19, n. 12 (16 giugno 2022): 7402. http://dx.doi.org/10.3390/ijerph19127402.

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This study aimed to reveal the distribution characteristics and sources of dissolved organic matter (DOM) in sediments of typical lakes in the southeastern of the Hubei province and provide a reference for pollution control of eutrophic lakes. The sediments of four typical lakes (Liangzi, Baoan, Daye, and Qingshan) in the southeastern of the Hubei Province were investigated in May 2019. Ultraviolet-visible (UV-Vis) absorption spectroscopy and excitation-emission matrixes characteristics of DOM were obtained by UV-Vis spectrophotometry and three-dimensional fluorescence spectroscopy. Moreover, the DOM fluorescence components were resolved by parallel factor analysis (PARAFAC). The results showed that: (1) The absorption coefficient a350 in surface sediments followed the order: Baoan Lake (16.99 ± 3.82 m−1) > Qingshan Lake (15.37 ± 3.8 m−1) > Liangzi Lake (12.54 ± 5.58 m−1) > Daye Lake (12.43 ± 1.43 m−1). Specifically, with increasing depth in the sediment cores, a350 increased and then gradually decreased in Daye Lake and Baoan Lake, but fluctuated in Liangzi Lake and Qingshan Lake with a roughly decreasing trend. (2) Two humic-like components (C1, C2) and one protein-like component (C3) were identified via PARAFAC. This analysis also showed that the surface sediment fluorescent dissolved organic matter (FDOM) was dominated by protein-like, while the sediment core FDOM was dominated by humic-like in Liangzi Lake. The proportion of humic-like in FDOM was higher than protein-like in surface sediments and sediment cores of Baoan, Daye, and Qingshan Lakes. (3) The DOM of surface sediments in the Liangzi Lake comprised mostly autochthonous components, mainly produced by the vital activities of aquatic organisms. The DOM of surface sediments in Baoan Lake and Qingshan Lake showed weak humic and moderate autochthonous characteristics. The humification of DOM in sediment cores of Liangzi, Baoan, and Qingshan Lakes gradually decreased from depth to the surface. The DOM in surface sediments of Daye Lake had strong humic and moderate autochthonous characteristics. (4) In general, the DOM of lake sediments in southeastern Hubei Province has dual-contribution characteristics representing terrigenous and endogenous sources. In the restoration and treatment of lake ecology, both internal and terrestrial pollution should be considered. At the same time, it is noteworthy that cyanobacteria depletion and aquatic residues caused potential internal pollution.

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3

Luo, Wenguang, Yan Pan, Yangzhen Fan, Jing Lu e Senlin Zhu. "Distribution Patterns of Sediment Organic Carbon Stocks in Shallow Lakes and the Significance for Sustainable Lake Management: Chaohu Lake in Eastern China as a Case Study". Land 13, n. 4 (12 aprile 2024): 507. http://dx.doi.org/10.3390/land13040507.

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Shallow lake sediments have huge potential for carbon storage, but they are vulnerable to various environmental changes and are highly susceptible to becoming a source of carbon emissions. Understanding the amount of sediment carbon storage can provide information about the potential of shallow lakes in mitigating climate change. In this study, sediment sampling was conducted at 12 study sites in Chaohu Lake, China, and sediment water content, grain size, bulk density, and sediments organic carbon (SOC) content were examined in five layers along the vertical direction, respectively, and the distribution and storage of SOC were estimated. The results showed that the surface sediments in the west lake area of Chaohu Lake would release 66,300 tons of SOC to the overlying water body in the future. The sediments in the middle lake area and the east lake area will absorb another 15,900 t and 17,300 t of TOC from the water body in the future, respectively. Overall, the lake-wide sediments will release 33,100 t of SOC into the water body in the future. In addition, the results of the study also indicate that human activities are another major influence on the change in organic carbon stocks in lake sediments, and therefore, proactive measures for the restoration and protection of lake sediments are essential because increasing the SOC stocks in the sediments and maintaining the lakes in a sustainable manner can contribute to the crucial role they play in mitigating climate change.

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4

Nik Daud, Nik Norsyahariati, Nur Safrah Anuar, Zainuddin Yusoff e Amimul Ahsan. "Assessment of Lake Sediments Properties and Contaminations Level". Advanced Materials Research 610-613 (dicembre 2012): 2100–2103. http://dx.doi.org/10.4028/www.scientific.net/amr.610-613.2100.

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Sediments are principal carriers of the trace elements in the hydrosphere. Properties of the sediment (such as grain size, specific surface area and pore volume) decide the concentration level of the pollutant contain in water. The properties of sediment differed in each lake according to the normal geological phenomenon and source of discharge wastewater. The purpose of this study is to investigate the properties and contamination level of the sediment collected from lakes in Universiti Putra Malaysia (UPM). Sediment samples are taken from three different lakes; Lake IT, Lake ENG and Lake PK. These locations are selected due to the type of wastewater has been discharged into the lakes which are from colleges and academic buildings. The sediments were tested in terms of physical, chemical properties and contaminant concentration (Pb, P and Cu). Using the contaminant concentration results; the sediment concentration level of the pollutant of each lakes were referred to the Consensus- Based Sediment Quality Guidelines (CBSQG-2003). The dominant grain sizes of the sediments were found in the range of silt/clay; with the size fraction in the range 12.74% to 12.83%. The specific surface areas of sediments were in the range of 16.3 to 22.5 m2/g with a pore size distribution in the range of 20 to 29 mm3/g. The chemical properties show that the pH values are in normal range; pH 7, TOC values in the range of 10.84 to 12.39% and salinity values in the range of 0.05 to 0.06 dS/m. The contaminant concentrations show that the main heavy metal presents in Lake IT, Lake ENG and Lake PK as Lead (Pb) with 0.033 mg/l, 0.036 mg/L and 0.038 mg/L, respectively. According to the CBSQG-2003, due to the concentration of Lead presents in lakes sediment in UPM area, the sediments were categorised as non-polluted.

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5

Gyulai, István, János Korponai, Sheila Mumbi A. Wamugi, Jázmin Jakab, Umar Abba Kawu, Andor G. Soltész, Tamás Karches e Uyanga Tumurtogoo. "Cladocera and Geochemical Variables from Core Sediments Show Different Conditions of Hungarian Lakes". Water 16, n. 9 (5 maggio 2024): 1310. http://dx.doi.org/10.3390/w16091310.

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Studies on the sediments of lakes with varying trophic status are of particular importance when considering changes in the natural environment. In this study, our objective was to examine subfossil remains of Cladocera species and the relationship between the sedimental Cladocera assemblages and geochemical variables during 11 years of sediment records from northern Hungarian lakes. To achieve this, we compared sedimental cladoceran communities and the geochemistry of the sediment layers among lakes. Among the studied lakes, one was an intermittent lake (KMT: the Kis-Morotva Lake) which dried out in 2012 but was subsequently naturally refilled in 2013 by groundwater affected by the high-water level of the River Tisza. The other type consisted of permanent lakes (SZA: the Szabolcs oxbow lake, TI: the Timár Morotva Lake) that never dried out. The results of the beta diversity analysis show that the deposition of Cladocera communities was similar among the sediment layers of lakes, while the abundance differences contributed significantly to replacement. Subsequently, core sediment samples of the three lakes were compared based on the remains of Cladocera communities and geochemical variables using Adonis (PERMANOVA). The core sediment samples indicate variations in Cladocera communities alongside disparities in geochemical variables across the same lakes. In conclusion, the significance of sediment cores containing the remains of the Cladocera community has grown significantly in the reconstruction of historical ecological and climatic changes.

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6

Syrykh, Liudmila S. "SEDIMENTATION AS A CLASSIFICATION CRITERION FOR LAKES ON THE EAST EUROPEAN PLAIN". Географический вестник = Geographical bulletin, n. 3 (2023): 19–26. http://dx.doi.org/10.17072/2079-7877-2023-3-19-26.

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The article studies lake sedimentation on the East European Plain and adjacent areas. Lake sediment formation is researched in detail in paleolimnology. The main aim of the present study is to describe the features of lake sedimentogenesis on the East European Plain and to identify classes of lakes in accordance with the types of sedimentogenesis. PaleoLake Database, created for the analysis, contains paleolimnological information about the bottom sediments of lakes of the East European Plain and nearby territories. We analyzed 216 lakes located in different climatic and geological zones, for which the most complete information had been collected: lithostratigraphy, age and thickness of bottom sediments, lake coordinates, water depth etc. Claster analysis of the collected data identified three main types of lake sedimentation for the East European Plain. (1) Sedimentation of large deep-water lakes (minerogenic sedimentogenesis of the Pleistocene). The bottom sediments are represented by minerogenic sediments, mainly clays and silts. (2) Sedimentation of isolated lake basins (mineragenic-organogenic sedimentogenesis of the Pleistocene and Holocene). The main feature of the lithostratigraphy is the presence of three main sediment sequences: minerogenic sediments formed in a large reservoir, transitional deposits formed during the isolation, organic deposits of a shallow basin. (3) Sedimentation of lakes located outside maritime transgressions and regressions (organogenic sedimentogenesis of the Holocene). The bottom sediments of such lakes are mainly represented by gyttja.

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7

Tretjakova, Rasma, e Andris Karpovičs. "MINERAL COMPOSITION OF SOME LATGALE LAKE SEDIMENTS". ENVIRONMENT. TECHNOLOGIES. RESOURCES. Proceedings of the International Scientific and Practical Conference 1 (20 giugno 2019): 304. http://dx.doi.org/10.17770/etr2019vol1.4146.

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Our research is focused on sedimentological conditions and postdepositional changes of recent fine grained lake sediments. We used bulk sediment mineralogical composition and grain size distribution as indicators to identify sediment source areas and possible changes during Holocene. We analysed fine grained (clayey) sediments from three Latgale lakes - Zeili, Pauguļi and Plusons, situated in Latgale upland. Lake sediments cover Late Pleistocene glacial deposits – loam and sandy loam. Bulk mineral composition of 6 sediment samples was determined by X-ray diffraction (XRD). Sediments contained typical minerals found in surrounding glacial sediments: rock-forming minerals as quartz, plagioclase, albite, enstatite, dolomite, calcite, and clay minerals - illite, kaolinite. To identify postdepositional changes in lake sediments of Holocene age clay minerals in clay fraction (<2 mkm) should be analysed. Particularly illite, smectite mixed layered minerals - illite/smectite (I/Sm) and chlorite. Additionally, grain size distribution of studied lake sediments was analysed. Accordingly, our studied sediments are clays, silty clays and clayey silts with bimodal particle distribution, except two samples from Zeiļi and Plusons with unimodal distribution.

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8

Woszczyk, Michał, Wojciech Tylmann, Jan Jędrasik, Tomasz Szarafin, Alfred Stach, Joanna Skrzypczak e Monika Lutyńska. "Recent sedimentation dynamics in a shallow coastal lake (Lake Sarbsko, northern Poland): driving factors, processes and effects". Marine and Freshwater Research 65, n. 12 (2014): 1102. http://dx.doi.org/10.1071/mf13336.

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Despite the fact that sediment dynamics in shallow coastal lakes strongly influences lake water quality and is crucial for preserving good quality paleo-records from coastal zones, the depositional processes in coastal lakes have not been thoroughly recognised so far. The present study aims at investigating the relationship between lake water circulation and the distribution of surface sediments, identifying the postdepositional physical mechanisms affecting lake deposits, and estimating the intensity of sediment mixing in a coastal lake on the Baltic coast. Our approach includes analyses of sediment grain size and chemical composition, hydrodynamic modelling and measurements of 210Pb activity in sediment short-cores from various sections of the lake. We showed that the distribution of lithofacies in the lake is explained by hydrodynamic conditions. Enhanced water dynamics reduces spatial extent of organic-rich lacustrine deposits and results in the exposure of relic marine-lagoonal sediments. A major part of the lake sediments is prone to vertical mixing by wind waves to a depth of ≥ 40 cm. Hydrodynamic modelling and 210Pb displayed overall agreement in predicting the depth of sediment mixing. At the same time the limitations of 210Pb as a geochronologic marker in shallow coastal lakes are revealed. It appears that even exponential depth-wise 210Pb distributions may be produced by storm redeposition.

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9

Nzekwe, Obinna P., Pierre Francus, Guillaume St-Onge, Patrick Lajeunesse, David Fortin, Antoine Gagnon-Poiré, Édouard G. H. Philippe e Alexandre Normandeau. "Recent sedimentation in three adjacent fjord-lakes on the Québec North Shore (eastern Canada): facies analysis, laminae preservation, and potential for varve formation". Canadian Journal of Earth Sciences 55, n. 2 (febbraio 2018): 138–53. http://dx.doi.org/10.1139/cjes-2017-0070.

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This paper analyzes short gravity cores sampled along transects in three adjacent deep fjord-lakes (lakes Pentecôte, Walker, and Pasteur) on the Québec North Shore, eastern Canada, to evaluate the distribution of laminated sediments and potential for varve formation. Facies analysis based on lithological description, digital photos, CT-scan images, and bathymetric data allowed for the identification of four main sediment facies, namely laminated sediments, partially laminated sediments, bioturbated sediments, and massive sediments. Direct evidence that Lake Walker undergoes thermal stratification was monitored from 2014 to 2016. Mean sedimentation rates and sedimentation fluxes of postglacial sediments in the distal basin of the three studied lakes are ≤0.12 cm a−1 and 0.03–0.16 g cm−2 a−1, respectively, based on 210Pb, 137Cs, and AMS radiocarbon dating. On the basis of thin section image analysis and 210Pb (CIC) chronology model, Lake Pentecôte contains mainly massive, partially laminated sediments, while Lake Pasteur contains partially laminated sediments and non-annual varve-like sediments. However, Lake Walker contains laminated sediments that are likely varves. The increased potential for laminae preservation observed in Lake Walker compared to lakes Pentecôte and Pasteur is associated with more favourable morphological characteristics including higher relative depth, mean depth, maximum depth, and topographic exposure.

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Tylmann, Wojciech, Paulina Głowacka e Agnieszka Szczerba. "Tracking climate signals in varved lake sediments: research strategy and key sites for comprehensive process studies in the Masurian Lakeland". Limnological Review 17, n. 3 (1 settembre 2017): 159–66. http://dx.doi.org/10.1515/limre-2017-0015.

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AbstractLake sediments are excellent archives of environmental and climate change. Especially important are varved sediments which can provide high-resolution (annual) records of those changes. Process studies including limnological measurements, particle flux monitoring and analyses of sediment structures give an opportunity to explain relationships between meteorological conditions, in-lake processes and varve formation. In our study, three lakes were selected in the Masurian Lakeland: Lake Żabińskie, Łazduny and Rzęśniki. These relatively small and deep lakes contain well preserved biogenic varves. The lakes are influenced by the same meteorological conditions but differ in terms of their catchment size, land use, hydrology, lake basin morphology and trophic status. To explore the relationships between different parameters and preservation/transformation of climate signals in the sediments we started systematic limnological measurements in the water column of these lakes, water sampling for hydrochemical analyses, monitoring of modern sedimentation using sediment traps and analysis of topmost varves from short sediment cores. With this comprehensive and high-resolution monitoring program scheduled for at least four years we are going to verify the potential of varves to track short-term meteorological phenomena in lake sediments.

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Più fonti

Tesi sul tema "Lake sediments"

1

Olli, Gull. "Waterborne sediment and pollutant transport into lakes and accumulation in lake sediments /". Stockholm : Department of Physical Geography and Quaternary Geology, Stockholm University, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-8302.

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2

Travers, Sarah. "Toxicity of Lake Sediments". Thesis, Ulster University, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.487669.

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The profundal sediment of many lakes is contaminated by heavy metals and persistent organic pollutants (POPs) deposited from the atmosphere, yet there has been little assessment of the biological effects of these toxicants. A Tier I sediment ecological risk assessment of profundal lake sediment that covers the range of contamination in the UK and Ireland was completed. Three laboratory sediment bioassays were used, Daphnia magna 7-day survival and reproduction, Gammarus pulex 14-day survival and growth and Chironomus riparius 10-day survival and growth/reproduction, and the concentrations of seven heavy metals and four groups of POPs (polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls, organochlorine pesticides and polybrominated diphenyl ethers) were determined.

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3

Olago, Daniel Ochieng. "Late Quaternary lake sediments of Mount Kenya, Kenya". Thesis, University of Oxford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.296036.

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4

Frappier, Monique G. "Late-glacial, fine-resolution pollen and sediment analyses of Little Dyke Lake sediments, Central Nova Scotia". Thesis, University of Ottawa (Canada), 1996. http://hdl.handle.net/10393/10247.

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A detailed analyses of Little Dyke Lake basal sediments revealed two environmental disturbances occurred during the late-glacial. These disturbances were correlated to the previously reported Killarney and Younger Dryas climatic oscillations of the Maritimes. Organic accumulation commenced at about 11 500 yrs BP. Macrofossil and pollen evidence indicate that a forest-tundra including abundant juniper and spruce krummholz had developed 300-600 years after deglaciation. Changes in the vegetation composition were followed by an increased inwash of coarser, siltier sediment. With climate amelioration, a spruce woodland grew during the time when paleo-Indians occupied the nearby Debert site. The deposition of clayey and organic rich sediments are associated with the spruce woodland. Plants found in the understory, especially herbs and grasses, and those most apt to grow under cooler, drier and disturbed conditions then became more important in the landscape. This shift in the vegetation cover is accompanied with the sudden replacement of dark clayey sediment by a reddish coarse silt. The termination of the Killarney cooling is reflected by an increase abundance of coarse mineral sediment. However, high Juniperus pollen percentages accompany a shrub Betula maxima when maximum erosion of sands arrives to the lake basin. Changes in the character of the sediment appear to coincide with pollen changes resulting from climatic cooling. (Abstract shortened by UMI.)

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5

Gälman, Veronika. "Varved lake sediments and diagenetic processes". Doctoral thesis, Umeå universitet, Institutionen för ekologi, miljö och geovetenskap, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-5724.

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Varved (annually laminated) sediments are of great interest for inference of past environmental conditions, as they provide dated records with high time resolution. After deposition, the sediment varves are affected by diagenesis; i.e., chemical, physical and biological changes that occur within the sediment. An important premise when reconstructing past environmental conditions using lake sediments is that the signal of interest is preserved in the sediment. In this thesis I have used a unique collection of ten stored freeze cores of varved lake sediment from Nylandssjön in northern Sweden, collected from 1979 to 2007. The suite of cores made it possible to follow long-term (up to 27 years) changes in iron (Fe), sulfur (S), carbon (C), nitrogen (N), δ13C and δ15N in the sediment caused by processes that occur in the lake bottom as the sediment ages. The sediment geochemistry and resulting changes were followed in years for which there are surface varves in the core series. Fe and S concentrations analyzed by X-ray fluorescence spectroscopy showed no diagenetic front in the sediment and the data do not suggest a substantial vertical transport of Fe and S in the sediment. A model based on thermodynamic, limnological, and sediment data from the lake, showed that there are pe (redox) ranges within which either FeS (reduced specie) or Fe(OH)3/FeOOH oxidized species) is the only solid phase present and there are pe ranges within which the two solid phases co-exist. This supports the hypothesis that blackish and grey-brownish Fe-layers that occur in the varves were formed at the time of deposition. C and N analyzed with an elemental analyzer showed that within the first five years after deposition the C concentration of the sediment decreased by 20% and N by 30%, and after 27 yr in the sediment, there was a 23% loss of C and 35% loss of N. The C:N ratio increased with increasing age of the sediment; from ~ 10 in the surface varves to ~12 after 27 years of aging. δ13C and δ15N analyzed on a mass spectrometer showed that δ13C increased by 0.4-1.5‰ units during the first five years, after that only minor fluctuations in δ13C were recorded. Another pattern was seen for δ15N, with a gradual decrease of 0.3-0.7‰ units over the entire 27-year-period. The diagenetic changes in the stable isotope values that occur in Nylandssjön are minor, but they are of about the same magnitude as the variation in the isotopic signal in the varves deposited between 1950-2006. My results show that diagenesis does not change the visual appearance of the varves, except for varve thickness; the varves get thinner as the sediment ages. As the color of Fe in the varves likely reflects the environmental conditions at the time of deposition this creates possibilities for deciphering high-temporal-resolution information of past hypolimnetic oxygen conditions from varves. My findings on C, N, δ13C and δ15N will have implications for interpretations of paleolimnological data. The diagenetic effects should be carefully taken into consideration when C, N, δ13C and δ15N in sediment cores are used to study organic matter sources or paleoproductivity, in particular when dealing with relatively small and recent changes. In addition to the significance of diagenetic effects on sediment parameters, a comparison of the varves in Nylandssjön and the adjacent lake Koltjärnen, and the two deep basins of Nylandssjön show that subtle features in the lakes and their catchments affect the appearance of the varves, which make interpretation of varves complicated.

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6

Schmitt, Harold Rolf. "Mobilization of gold into lake sediments". Thesis, University of Ottawa (Canada), 1993. http://hdl.handle.net/10393/6767.

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Geochemical exploration methods are able to contribute significantly to the detection of concealed Au mineralization in glaciated terrains. Gold analyses of lake sediments from the glaciated Canadian Shield have been used since the mid-1980s to explore for Au mineralization. For lake sediments to be an effective indicator of Au mineralization, the element must migrate in solution or adsorbed on suspensates in the boreal forest zone where low relief and disorganized drainage restricts dispersal and concentration in clastic form. Organic-rich profundal lake sediments often contain anomalous Au contents near Au mineralization, suggesting that Au is entering the lake environment in mobile form. Confirmation of the processes by which Au is mobilized into lake sediments could thus contribute to improved exploration methodologies. This study investigated the nature of Au mobility and dispersion into lake sediments under alkaline and acid hydrological conditions in the southern Canadian Shield. The study makes recommendations for exploration strategies to be employed under these conditions. Three field areas were selected for detailed study: Napier Lake, Ontario; PAP Lake, Saskatchewan; and Foster Lake, Manitoba. (Abstract shortened by UMI.)

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7

Den, Heyer Cornelia E. "Organic matter mineralization in lake sediments : a within and among lake study". Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=23996.

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Organic matter mineralization by sediment bacteria was measured by the accumulation of DIC + CH$ sb4$ in the water overlying intact cores taken from littoral and profundal sediments of 9 lakes. The variability in areal carbon mineralization was much greater within lakes than among lakes, with the rate of organic matter mineralization in littoral sediments, on average, 3-fold higher than in the deeper sediments.
Sixty percent of the variation in summer carbon mineralization rates is explained by site depth, a surrogate variable which incorporates the effect of temperature and may also be reflecting organic matter quality and/or supply. Lake-specific variables become useful predictors of carbon mineralization only after the site depth is considered.
A comparison of the mineralization in sediments overlain by epilimnetic water to the whole lake sediment mineralization demonstrates the overwhelming importance of the littoral sediments in organic matter mineralization, with more than half (54-100%) of the mineralization in the sediments occurring in the littoral zone. However, the littoral sediments account for less than 20% of the gross respiration in the epilimnion. (Abstract shortened by UMI.)

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8

Rowan, David J. "The distribution, texture and trace element concentrations of lake sediments /". Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=70361.

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Hypotheses regarding the distribution, texture and trace element concentrations of lake sediments were tested by empirical analyses of multi-lake data sets (52 to 83 lakes). Sediment distribution was best characterized by the deposition boundary depth (DBD), the abrupt transition from coarse- to fine-grained sediments. The DBD can now be predicted from either empirical models or empirical-theoretical simplifications of wave of sediment threshold theory, both in terms of exposure (or fetch) and bottom slope. The texture (organic content, water content and bulk density) of profundal sediments was related to the inorganic sedimentation rate and exposure, but not to the lake trophic status or the net organic matter sedimentation rate. The relationships between sediment texture and intra- and inter-site variability, together with the models that predict the DBD and sediment texture, were used to develop an algorithm that should greatly reduce sampling effort in lake sediment surveys. Finally, sediment trace element concentrations were predicted from sediment texture, site depth and simple geologic classifications. The models developed here, provide a framework in which to sample lake sediments and interpret their properties.

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9

Zastepa, Arthur. "Fate and Persistence of Microcystin Congeners in Lakes and Lake Sediments". Thesis, Université d'Ottawa / University of Ottawa, 2014. http://hdl.handle.net/10393/30453.

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Cyanobacterial blooms and their toxins are a major water quality and potential health risk around the world. This thesis developed an analytical method for microcystin congeners in sediments in order to examine their fate in lakes and establish the history of toxin-producing cyanobacteria in relation to environmental change using lake sediments. A novel method for both intra- and extracellular microcystins in lake sediments was developed, consisting of accelerated solvent extraction, hydrophilic-lipophilic balance solid phase extraction and multiple reaction monitoring-based HPLC-MS/MS quantitation. The method achieved comparable recoveries of intra- and extracellular cyanotoxins based on nine microcystins and nodularin (marine analogue). The analytical method was validated using surficial and deeper sediments from seven lakes of diverse geography and trophic state. To study the fate of microcystins, a multi-year, whole lake study of Microcystis blooms was conducted to obtain both in situ and in vitro half-life estimates of microcystin-LA (MC-LA), an understudied, but increasingly reported microcystin. MC-LA appeared to undergo slower rates of decomposition and persist longer than the more frequently studied MC-LR. Experimentally, high light intensity increased in vitro decomposition of dissolved MC-LA while high temperature enhanced decomposition in the particulate phase. Sediment deposition measurements and estimates of sediment-pore water distribution coefficients, sediment accumulation rates, and diffusive fluxes indicated that microcystin congeners differ in their fate. Notably, MC-LA preferentially distributed into pore water and remobilized (by diffusion) from sediments and into overlying water while MC-RR adsorbed more strongly to sediment particles. Finally, the sediment record of an eutrophic lake of major recreational importance was examined to identify possible drivers of toxigenic cyanobacteria and determine if the perceived increase in toxigenic cyanobacteria could be corroborated. Microcystins were detected to the bottom of the core (early 1800s), indicating that toxigenic cyanobacteria were present prior to the first permanent settlements. Microcystins were significantly correlated with changes in diatom-inferred nutrients (DI-TP and DI-TKN) within the sediment core as well as with specific algal pigments. Sediment microcystins in the upper layers also significantly correlated with a 20-year monitoring record for water column microcystins suggesting that sediment microcystins can be used as a proxy for past surface water conditions.

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Gudasz, Cristian. "Boreal Lake Sediments as Sources and Sinks of Carbon". Doctoral thesis, Uppsala universitet, Limnologi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-150709.

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Inland waters process large amounts of organic carbon, contributing to CO2 and CH4 emissions, as well as storing organic carbon (OC) over geological timescales. Recently, it has been shown that the magnitude of these processes is of global significance. It is therefore important to understand what regulates OC cycling in inland waters and how is that affected by climate change. This thesis investigates the constraints on microbial processing of sediment OC, as a key factor of the carbon cycling in boreal lakes. Sediment bacterial metabolism was primarily controlled by temperature but also regulated by OC quality/origin. Temperature sensitivity of sediment OC mineralization was similar in contrasting lakes and over long-term. Allochthonous OC had a strong constraining effect on sediment bacterial metabolism and biomass, with increasingly allochthonous sediments supporting decreasing bacterial metabolism and biomass. The bacterial biomass followed the same pattern as bacterial activity and was largely regulated by similar factors. The rapid turnover of bacterial biomass as well as the positive correlation between sediment mineralization and bacterial biomass suggest a limited effect of bacterial grazing. Regardless of the OC source, the sediment microbial community was more similar within season than within lakes. A comparison of data from numerous soils as well as sediments on the temperature response of OC mineralization showed higher temperature sensitivity of the sediment mineralization. Furthermore, the low rates of areal OC mineralization in sediments compared to soils suggest that lakes sediments are hotspots of OC sequestration. Increased sediment mineralization due to increase in temperature in epilimnetic sediments can significantly reduce OC burial in boreal lakes. An increase of temperature, as predicted for Northern latitudes, under different climate warming scenarios by the end of the twenty-first century, resulted in 4–27% decrease in lake sediment OC burial for the entire boreal zone.

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Più fonti

Libri sul tema "Lake sediments"

1

Saarse, Leili. Donnye otlozhenii︠a︡ malykh ozer Ėstonii: Bottom deposits of small Estonian lakes / Leili Saarse. Tallinn: Akademii︠a︡ nauk Ėstonii, Institut geologii, 1994.

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2

Vasilʹeva, E. P. Katalog ozër Karelii: Donnye otlozhenii͡a. Petrozavodsk: Karelʹskiĭ nauchnyĭ t͡sentr RAN, 1992.

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3

Patterson, Glenn G. Sediment transport and deposition in Lakes Marion and Moultrie, South Carolina, 1942-85. Columbia, S.C: U.S. Dept. of the Interior, U.S. Geological Survey, 1996.

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4

Patterson, Glenn G. Sediment transport and deposition in Lakes Marion and Moultrie, South Carolina, 1942-85. Columbia, S.C: U.S. Dept. of the Interior, U.S. Geological Survey, 1996.

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5

Patterson, Glenn G. Sediment transport and deposition in Lakes Marion and Moultrie, South Carolina, 1942-85. Columbia, S.C: U.S. Dept. of the Interior, U.S. Geological Survey, 1996.

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6

Patterson, Glenn G. Sediment transport and deposition in Lakes Marion and Moultrie, South Carolina, 1942-85. Columbia, S.C: U.S. Dept. of the Interior, U.S. Geological Survey, 1996.

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7

McGee, Benton D. Water-quality and bottom-material characteristics of Cross Lake, Caddo Parish, Louisiana, 1997-99. Baton Rouge, La: U.S. Dept. of the Interior, U.S. Geological Survey, 2004.

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McGee, Benton D. Water-quality and bottom-material characteristics of Cross Lake, Caddo Parish, Louisiana, 1997-99. Baton Rouge, La: U.S. Dept. of the Interior, U.S. Geological Survey, 2004.

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9

McGee, Benton D. Water-quality and bottom-material characteristics of Cross Lake, Caddo Parish, Louisiana, 1997-99. Baton Rouge, La: U.S. Dept. of the Interior, U.S. Geological Survey, 2004.

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10

Fan, Chengxin, e Lu Zhang. Tai hu: Chen ji wu wu ran yu xiu fu yuan li. Bei jing: Ke xue chu ban she, 2009.

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Capitoli di libri sul tema "Lake sediments"

1

Herschy, Reginald W. "Lake Sediments". In Encyclopedia of Lakes and Reservoirs, 458–63. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-1-4020-4410-6_26.

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2

Mothes, G., e G. Proft. "Sediments and sedimentation". In Lake Stechlin, 375–99. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-5506-6_13.

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3

Crompton, Thomas R. "Lake and Pond Sediments". In Analysis of Solids in Natural Waters, 67–79. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/978-3-642-85223-7_3.

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4

LENG, MELANIE J., ANGELA L. LAMB, TIMOTHY H. E. HEATON, JAMES D. MARSHALL, BRENT B. WOLFE, MATTHEW D. JONES, JONATHAN A. HOLMES e CAROL ARROWSMITH. "ISOTOPES IN LAKE SEDIMENTS". In Isotopes in Palaeoenvironmental Research, 147–84. Dordrecht: Springer Netherlands, 2006. http://dx.doi.org/10.1007/1-4020-2504-1_04.

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5

Appleby, P. G., N. Richardson e P. J. Nolan. "241Am dating of lake sediments". In Environmental History and Palaeolimnology, 35–42. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3592-4_4.

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6

Petersen, Nikolai, Dieter G. Weiss e Hojatollah Vali. "Magnetic Bacteria in Lake Sediments". In Geomagnetism and Palaeomagnetism, 231–41. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-0905-2_17.

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7

Barouillet, Cécilia, Isabelle Domaizon e Eric Capo. "Protist DNA from Lake Sediments". In Tracking Environmental Change Using Lake Sediments, 175–203. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-43799-1_6.

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8

Dulias, Katharina, Laura S. Epp e Kathleen R. Stoof-Leichsenring. "Diatom DNA from Lake Sediments". In Tracking Environmental Change Using Lake Sediments, 205–33. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-43799-1_7.

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9

Monchamp, Marie-Eve, e Frances R. Pick. "Cyanobacterial DNA from Lake Sediments". In Tracking Environmental Change Using Lake Sediments, 153–74. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-43799-1_5.

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10

Katsev, Sergei. "Phosphorus Effluxes from Lake Sediments". In Soil Phosphorus, 115–31. Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742: CRC Press, 2016. http://dx.doi.org/10.1201/9781315372327-7.

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Atti di convegni sul tema "Lake sediments"

1

Catianis, Irina, Adriana Maria Constantinescu, Dan-Lucian Vasiliu, Bogdan-Adrian Ispas e Dumitru Grosu. "PHYSICAL AND CHEMICAL CHARACTERISTICS OF TATARU AND MERHEI LACUSTRINE SEDIMENTS, FROM THE DANUBE DELTA, ROMANIA". In 22nd SGEM International Multidisciplinary Scientific GeoConference 2022. STEF92 Technology, 2022. http://dx.doi.org/10.5593/sgem2022/5.1/s20.042.

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The quality and quantity of delta lakes� sediment depend on fluvial input and in-situ bio-geo-chemical processes. The present study investigates the quality of lacustrine sediments collected from two lakes - Tataru and Merhei, situated in different hydrodynamic environments within the Danube Delta, Romania, but both connected to fluvial input of water and sediment of the Danube. The following physical and chemical analyses have been carried out on several lake-bottom sediment samples: the main lithological components (total organic matter-TOM%, total carbonates-CAR% and siliciclastic fraction-SIL%), particle size analysis and technophilic element contents. The lithological analysis reveals a considerable variation related to the TOM%, CAR% and SIL% fractions. From this perspective, the investigated lacustrine sediments are generally characterized as organic-rich sediments (endogenous input). The grain size analysis shows the predominance of sandy silt sediments in both lakes. The data regarding the content of technophilic elements in the bed-sediment samples is given in comparison with their natural geochemical background reference value and their acceptable limits provided by the national reference standard. The general characterization of the investigated sediments reveals slight differences among the two investigated lakes in terms of the sediment input from the Danube River. The acquired results contribute to improve the knowledge about physical and chemical characteristics of lacustrine sediments and to plan management strategies of the deltaic lakes for future conservation perspectives, considering the great international importance of the Danube Delta Biosphere Reserve.

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2

PREOTEASA, LUMINITA, DAN OLTEANU, ROBERT BEGY, ANA-MARIA BLEBEA APOSTU, LAURENTIU TUTUIANU e ALFRED VESPREMEANU-STROE. "IMPACT OF RECENT ANTHROPOGENIC INTERVENTIONS IN THE DANUBE DELTA ON LAKES SEDIMENTATION – CASE STUDY: ROȘULEȚ LAKE". In Coastal Sediments 2023. WORLD SCIENTIFIC, 2023. http://dx.doi.org/10.1142/9789811275135_0165.

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3

Rybalko, A. "PALEOGEOGRAPHY OF THE POOL OF THE TELETSK LAKE IN THE LATE NEOPLEISTOCENE – HOLOTSENE". In Prirodopol'zovanie i ohrana prirody: Ohrana pamjatnikov prirody, biologicheskogo i landshaftnogo raznoobrazija Tomskogo Priob'ja i drugih regionov Rossii. Izdatel'stvo Tomskogo gosudarstvennogo universiteta, 2020. http://dx.doi.org/10.17223/978-5-94621-954-9-2020-53.

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The section of lake sediments located in the Teletskoye Lake region of Gorny Altai, at the mouth of the Iogach River, was studied and described. Based on the data of radiocarbon and spore-pollen methods, the age of the studied lake sediments is accepted as Late Neopleistocene.

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4

Zhang, Ning, Puxuan Li, Eric Gonzalez Pons, Jasmin Kurt e Miloban Correa Silva. "Numerical Analysis of Erosion and Sediment Control Using Lake-Shore Extensions in Lake Charles". In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-63624.

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CFD simulations in Lake Charles were conducted to investigate the hydrodynamics and sediment transport in Lake Charles water system, assisting the design optimization of a lake-shore extension project. The extensions not only aim to create addition lands for recreation, but also to serve as flow/erosion control and sediment reduction structures. In the simulation model, 2D depth-averaged shallow-water equation set as well as the scalar transport equation are solved. The particle settling effect is included in the transport equation. In addition to the unsteady distribution of sediment concentration, the distribution of the mass of deposited sediments on the seabed is also calculated, and used as an indicator for the severeness of sedimentation in the area. The wind effect is included in the model, and a hurricane is simulated to study its effects on the designed structures. The present shore-line was surveyed and the depth of the lake was measured using a GPS depth finding system to ensure the accuracy of the simulation.

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MORANG, ANDREW, ASHLEY E. FREY, DAVID F. BUCARO e SARA BRODZINSKY. "SEDIMENT BUDGET ON THE INDIANA SHORE AT BURNS HARBOR, LAKE MICHIGAN". In Coastal Sediments 2015. WORLD SCIENTIFIC, 2015. http://dx.doi.org/10.1142/9789814689977_0146.

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6

Dickey, Hank, Matthew E. Kirby, Ed Knell, William T. Anderson, Stephanie Hernandez, Sophia Obarr, Jen Leidelmeijer, Jan Taylor e Eyrica Arriola. "USING LAKE SEDIMENTS TO INFER LATE-GLACIAL HYDROLOGIC CONDITIONS OF PLUVIAL LAKE MOJAVE, CALIFORNIA". In 116th Annual GSA Cordilleran Section Meeting - 2020. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020cd-347676.

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7

ABDELHADY, H. U., e C. D. TROY. "MODELING LAKE MICHIGAN SHORELINE CHANGES IN RESPONSE TO RAPID WATER LEVEL FLUCTUATIONS". In Coastal Sediments 2023. WORLD SCIENTIFIC, 2023. http://dx.doi.org/10.1142/9789811275135_0123.

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8

Zhang, Ning, Anpeng He, Jeff Corbino, Paul Schroeder e Johnathan Bolton. "The Impacts of Confined Disposal Facilities on Calcasieu Ship Channel Sedimentation". In ASME 2013 Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/fedsm2013-16160.

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The confined disposal facilities (CDFs) are the areas along Calcasieu Ship Channel to store dredged sediments from the ship channel. As the sediments settle in the CDFs, the low concentration sediment flows are discharged into the open water adjacent to the CDFs. The paper demonstrates flow and sediment transport characteristics in the open water due to the CDF discharge. The sediment distributions in all three dimensions in the water are revealed. The lake current effects were also investigated. A commercial CFD package ANSYS-FLUENT is used to simulate all cases in this study.

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Tegowski, Jaroslaw, Ilia Ostrovsky, Kumagai Michio, Zamaryka Mateusz e Kanako Ishikawa. "Acoustic signatures of gassy sediments in two subtropical lakes - Lake Kinneret (Israel) and Lake Biwa (Japan)". In ECUA 2012 11th European Conference on Underwater Acoustics. Acoustical Society of America, 2012. http://dx.doi.org/10.1121/1.4773461.

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Castaneda, Isla S., Daniel R. Miller, Thivanka Ariyarathna e Jeffrey M. Salacup. "THE ORGANIC GEOCHEMISTRY OF SEBAGO LAKE SEDIMENTS". In 53rd Annual GSA Northeastern Section Meeting - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018ne-310631.

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Rapporti di organizzazioni sul tema "Lake sediments"

1

Lewis, C. F. M., e B. J. Todd. Sediments and Late Quaternary history of Lake Ontario. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1995. http://dx.doi.org/10.4095/205054.

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2

Todd, B. J., e C. F. M. Lewis. Seismostratigraphy of Lake Winnipeg sediments. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1996. http://dx.doi.org/10.4095/207504.

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3

Henderson, P. J. Geochemistry of Lake Winnipeg sediments. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1996. http://dx.doi.org/10.4095/207512.

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4

Vance, R. E. Paleobotany of Lake Winnipeg sediments. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1996. http://dx.doi.org/10.4095/207519.

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5

Henderson, P. J. Geochemistry of Lake Winnipeg sediments. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1996. http://dx.doi.org/10.4095/207532.

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6

Rodriques, C. G. Ostracode stratigraphy of Lake Winnipeg sediments. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1996. http://dx.doi.org/10.4095/207516.

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7

Burbidge, S. M., e C. J. Schröder-Adams. Thecamoebian stratigraphy of Lake Winnipeg sediments. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1996. http://dx.doi.org/10.4095/207517.

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8

Dyke, A. S., J. E. Campbell e G. Lauzon. Surficial geology, Abitau Lake, Northwest Territories, NTS 75-B. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/330072.

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The Abitau Lake map area lies in the Rae Province of the Canadian Shield. Quaternary deposits are extensive and thick, with bedrock outcrop concentrated in the northwest and southwest. Till is extensively streamlined to the west-southwest by late deglacial ice flow from the Keewatin Ice Divide. The region is incised by west-southwest flowing subglacial meltwater corridors that extend across the map area, spaced 5 to 15 km apart. The ice flow chronology (Figure 1) is recorded both in the landforms and in the striae record. Rare measurements record an old flowset oriented northwest-southeast. Well defined indicators in cross-cutting relationships reveal a regional clockwise rotation in ice-flow directions evolving from an old southward to a late deglacial westward flow. Short-lived proglacial lakes, as evidenced by wave-cut scarps, terraced outwash, ice-contact deltas, and patches of glacial lake sediments, occupied a paleodrainage area not only of Hudson Bay but possibly also the headwaters of the Mackenzie River.

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9

Clague, J. J. Holocene sediments at McNaughton Lake, British Columbia. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1988. http://dx.doi.org/10.4095/122686.

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10

Betcher, R. N., e W. M. Buhay. Pore-water chemistry of Lake Winnipeg sediments. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1996. http://dx.doi.org/10.4095/207514.

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