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Wyszukujesz frazę "marine sediments" wg kryterium: Temat


Wyświetlanie 1-10 z 10
Tytuł:
Mercury in the bottom sediments of the ship channel and River Mouths: the Vistula Lagoon
Autorzy:
Bogdanov, N. A.
Bass, O. V.
Paranina, A. N.
Paranin, R.
Powiązania:
https://bibliotekanauki.pl/articles/1841583.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
Vistula Lagoon
mercury
bottom sediments
ship channel
river mouths
Kaliningrad Sea Canal
dangerous toxicant
marine environment
Opis:
It is studied the distribution of Hg in bottom sediments of estuaries on the banks of the open water area of the Vistula Lagoon and in the Kaliningrad Sea Canal (KSC) isolated from it. Methods for the determination of Hg: inversive voltammetry and highly sensitive flameless atomic absorption spectrometry. It has been established: from spring to autumn the activation of storms and surge events in the lagoon, intensification of the water flushing regime of the channels ensure a significant Hg decrease in river mouths, but in dynamically weakened KSC conditions - an increase in Hg (from 0.05 to 0.85 mg / kg). In KSC bays, the safe level of Hg (0.3 mg / kg) for the period 2000-2015 was not exceeded (0.008 to 0.216 mg / kg), which indicates a favorable ecological and epidemiological situation. Hg determinations by low-sensitivity methods can be used only in qualitative assessments of the variability in concentrations of any dangerous toxicant. Finding a reliable amount of Hg in river mouths requires the use of highly sensitive methods of analysis.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2020, 14, 3; 697-700
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Differences in shell size of the bivalve Varicorbula between marginal parts of the Vienna and Danube basins
Autorzy:
Fuksi, T.
Powiązania:
https://bibliotekanauki.pl/articles/184316.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Middle Miocene
marine sediments
molluscan community
Opis:
Middle Miocene marine sediments in the Vienna and Danube Basins provide opportunities for analysis of spatial and temporal variations in the composition of molluscan communities and variations in species abundance and size. Varicorbula gibba (Olivi 1792) is an opportunistic bivalve with high tolerance to hypoxic conditions and variations in salinity (Holmes & Miller 2006) that appears in the Oligocene and persists to present, occurring in the tropical and northern temperate Eastern Atlantic and in the Mediterranean. Varicorbula belongs to one of the most frequent species in the benthic communities in the Paratethys during the Middle Miocene. However, spatial and temporal variations in taphonomic preservation and in abundance, size, and shape of this genus is poorly known – insights into such variations would improve paleoenvironmental interpretations. Molluscan assemblages with Varicorbula gibba (Olivi 1792) were collected from boreholes located in the western (Vienna basin) and eastern (Danube basin) margins of the Malé Karpaty Mountains (Slovakia). Boreholes intersect sediments of the Studienka Formation (Vienna Basin) respective Madunice Formation (Danube Basin) that belong mainly to the Upper Badenian stage (Janočko et al. 2003, Kováč et al. 2004). We have selected assemblages with more than 20 Varicorbula specimens from sediment samples sieved with 1 mm mesh size. A well preserved shelly material contains presently more than 130 specimens of Varicorbula , with ongoing screening of additional samples. We measured dimensions of four morphological variables (in mm). Shell length, shell height, posterior shell length and upper shell height were measured on all specimens. The valves were photographed and the dimensions were measured using ImageJ image analysis software. We used principal component analysis (PCA) and bivariate and multivariate allometric analyses to investigate ontogenetic and spatial variations in size and shape. We find that this taxon shows significant regional-scale differences in size distribution between the coeval Upper Badenian sediments in the Vienna and Danube basins, with significantly smaller size in the Danube Basin. In subtidal muds in the northern parts of the Vienna Basin, Varicorbula gibba achieves very high proportional community-level abundance and its median shell width ranges between 6–10 mm. Specimens from low-energy muddy sediments of the Vienna basin show low levels of taphonomic damage but are frequently bored by naticids snails that produce the trace fossil Oichnus paraboloides (Bromley 1981, Pek et al. 1997). In contrast, muddy sands from the northeastern margin of the Danube Basin; community composition is more even and median width ranges just between 3–4 mm. The higher sandy content and lower sedimentation rates (as evidenced by higher taphonomic damage, with higher proportion of bored specimens (by muricid snails – Oichnus simplex, in the Danube Basin; Bromley 1981) imply that the regional size differences can partly positively correlate with nutrient supply. Morphometric analyses indicate that height and width of individuals of this taxon undergo significant ontogenetic allometry and that smaller-sized individuals in the Danube Basin have a smaller width/ height ratio. Therefore, some shape differences in the height-width ratio between the two basins are unrelated to ontogenetic allometric effects (because height-width ratio changes even during the ontogeny).
Źródło:
Geology, Geophysics and Environment; 2016, 42, 1; 71-72
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stratygrafia, petrografia i paleogeografia glin lodowcowych w rejonie północno-zachodniego wybrzeża Polski
Till stratigraphy, petrography and palaeogeography along the northwestern coastal region of Poland
Autorzy:
Krzyszkowski, D.
Powiązania:
https://bibliotekanauki.pl/articles/2062787.pdf
Data publikacji:
2010
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
stratygrafia
petrografia glin lodowcowych
plejstocen
morski interglacjał emski
stratigraphy
till petrography
marine Eemian sediments
Pleistocene
Opis:
Na obszarze północno-zachodniego wybrzeża Polski udokumentowano 10 różnowiekowych poziomów glin lodowcowych: dwa z najstarszych zlodowaceń, trzy ze zlodowaceń południowopolskich, trzy ze zlodowaceń środkowopolskich i dwa z ostatniego zlodowacenia. Dla niektórych poziomów stratygraficznych zdefiniowano na podstawie ich składu petrograficznego różne typy regionalne glin lodowcowych, z których niektóre niewątpliwie wyznaczają zasięgi oddzielnych lobów lodowcowych. Część wydzielonych typów glin posiada takie same cechy składu petrograficznego jak gliny w regionie szczecińskim. Dla innych typów glin opisano cechy specyficzne tylko dla regionu północno-zachodniego wybrzeża i te poziomy zdefiniowano formalnie, wskazując dla nich profile stratotypowe, cechy przewodnie i zasięg regionalny. Występowanie większości poziomów glin jest w regionie północno-zachodniego wybrzeża sporadyczne i zazwyczaj nie tworzą one ciągłych horyzontów. Różne loby lodowcowe udokumentowano dla najmłodszego stadiału zlodowacenia południowopolskiego, najmłodszego stadiału zlodowacenia środkowopolskiego oraz dla faz leszczyńskiej i poznańsko-pomorskiej stadiału głównego ostatniego zlodowacenia. Występowanie wyraźnie zaznaczonych lobów lodowcowych, szczególnie dla awansów ze wschodu lub północnego-wschodu, jest związane z pozycją na obrzeżu niecki południowego Bałtyku, gdzie następuje rozdzielenie lobów na te, które kontynuują awans w kierunku zachodnim (do NW Niemiec i Danii) oraz te które zmieniają kierunek awansu na południowy zachód i południe wzdłuż doliny Odry (lob Odry, do południowo-wschodnich Niemiec i zachodniej Polski). Ponadto, na obszarze północno-zachodniego wybrzeża, występują morskie utwory interglacjału eemskiego. Są to osady ilasto-mułkowe i piaszczyste z fauną mięczaków morskich, reprezentujące facje przybrzeżne (lagunowe, plażowe) i występujące na głębokości od 5,5–19,6 m pod poziomem współczesnego morza. Zasięg tych osadów wskazuje na istnienie zatoki morskiej wciętej na około 10 km w głąb lądu, być może uformowanej w dawnej rynnie glacjalnej.
There are 10 till horizons of different ages in the northwestern coastal region of Poland, representing the “oldest” glaciation (2 horizons), Elsterian glaciation (3), Saalian glaciation (3) and the last glaciation (2). Some stratigraphic horizons contain tills of regionally variable petrographic composition, which usually represent tills from different lobes of the same ice sheet advance. Several till horizons have features similar to the tills defined in the southern part of the Szczecin region, others have a petrographic composition specific only to the northwestern coastal region of Poland. The last ones have been newly and formally defined, with an indication of stratotype sections, characteristic features and extents. In the northwestern coastal region of Poland, the till horizons occur sporadically and they do not form continuous beds. Glacial lobes have been proved for the late Elsterian, late Saalian and for both Weichselian advances. Their occurrence (especially during the latest advances coming from the northeast or east) is due to their location in the southern Baltic basin, where the ice sheets differentiated into the lobes that continued their advances towards the west to NW Germany and Denmark, and those that deflected along the Odra river valley (Odra lobe) towards the SW and south to SE Germany and western Poland. Moreover, Eemian marine sediments, clay or sand with mollusc fauna have been found in the northwestern coastal region. They occur at a depth of 5.5–19.6 m below the present-day sea level. They were deposited in a shallow bay extending about 10 km inland. The location of these sediments suggests a marine transgression into a pre-existing tunnel valley.
Źródło:
Biuletyn Państwowego Instytutu Geologicznego; 2010, 438; 51--91
0867-6143
Pojawia się w:
Biuletyn Państwowego Instytutu Geologicznego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of different binder combinations of cement, slag and ckd for s/s treatment of tbt contaminated sediments
Autorzy:
Lindh, Per
Lemenkova, Polina
Powiązania:
https://bibliotekanauki.pl/articles/2111456.pdf
Data publikacji:
2021
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
cement kiln dust
CKD
marine sediments
tributyltin
TBT
leaching
s/s soils
Opis:
The seabed in the ports needs to be regularly cleaned from the marine sediments for safe navigation. Sediments contaminated by tributyltin (TBT) are environmentally harmful and require treatment before recycling. Treatment methods include leaching, stabilisation and solidification to remove toxic chemicals from the sediments and improve their strength for reuse in the construction works. This study evaluated the effects of adding three different binder components (cement, cement kiln dust (CKD) and slag) to treat sediment samples collected in the port of Gothenburg. The goal of this study is to assess the leaching of TBT from the dredged marine sediments contaminated by TBT. The various methods employed for the treatment of sediments include the application of varied ratios of binders. The project has been performed by the Swedish Geotechnical Institute (SGI) on behalf of the Cementa (HeidelbergCement Group) and Cowi Consulting Group, within the framework of the Arendal project. An experiment has been designed to evaluate the effects of adding CKD while reducing cement and slag for sediment treatment. Methods that have been adopted include laboratory processing of samples for leaching using different binder combinations, followed by statistical data processing and graphical plotting. The results of the experiment on leaching of TBT for all samples are tested with a varied ratio of cement, slag, CKD and water. Specimens with added binders 'cement/CKD' have demonstrated higher leaching compared to the ratio 'cement/slag/CKD' and 'cement/slag'. The 'CKD/slag' ratio has presented the best results followed by the ‘cement/slag/CKD’, and can be used as an effective method of s/s treatment of the sediments. The results have shown that the replacement of cement and slag by CKD is effective at TBT leaching for the treatment of toxic marine sediments contaminated by TBT.
Źródło:
Acta Mechanica et Automatica; 2021, 15, 4; 236--248
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Expressions of shallow gas in the Gdansk Basin
Różnorodność form (przejawy obecności) występowania gazu w osadach Basenu Gdańskiego
Autorzy:
Majewski, P.
Klusek, Z.
Powiązania:
https://bibliotekanauki.pl/articles/222655.pdf
Data publikacji:
2011
Wydawca:
Akademia Marynarki Wojennej. Wydział Dowodzenia i Operacji Morskich
Tematy:
gaz
metan
osady morskie
Basen Gdański
anomalie akustyczne
kratery gazowe
Bałtyk
gas
methane
marine sediments
Gdańsk Basin
acoustic anomalies
gas pockmarks
Balic
Opis:
In the paper, a short introduction to present-day acoustic and seismoacoustic inventory of shallow gas occurrence and its expression in the Gdansk Basin is presented. Signals of various frequencies and beamforming were employed during surveys conducted from the board of r/v ‘Oceania’. Such a set of diverse acoustic signals was exploited in order to obtain a better recognition of different forms of shallow gas existence in the area. The utilized frequency started from about 1 kHz once a boomer was used in sounding, up to 40–60 kHz in the case a chirp echosounder. At acoustic transects classical echosounders working at 12 and 38 kHz were applied. Some details of the qualitative analysis and the technicalities of the algorithms are given. Variety of examples of echo images obtained in different frequency bands, associated with different forms of gas occurrence is presented.
W artykule dokonano wprowadzenia do współcześnie prowadzonych metodami akustycznymi detekcji i rozpoznawania różnorodności postaci występowania gazu w osadach dennych Basenu Gdańskiego. W celach lepszego rozpoznania form występowania gazu w górnej warstwie osadów w rejsach badawczych r/v „Oceanii” zastosowano sondowanie dna za pomocą sygnałów akustycznych zróżnicowanych pod względem częstotliwości oraz ukształtowania wiązki. Zakres częstotliwości sygnałów akustycznych wykorzystanych w sondowaniu dna zawierał się w granicach od około 1 kHz (boomer) poprzez 12/38 kHz do szerokopasmowych w granicach 40–80 kHz. Na wielu transektach akustycznych do obrazowania ukształtowania dna i warstwy naddanej zastosowano również sonar boczny i echosondę wielowiązkową. W artykule przedstawiono niektóre elementy analizy jakościowej oraz przybliżono szczegóły techniczne algorytmów pozwalających na identyfikację gazu w osadach. Zaprezentowano także liczne przykłady obrazów echa otrzymane dla sygnałów akustycznych w różnych pasmach częstotliwości, powiązanych z występowaniem gazu w osadach.
Źródło:
Zeszyty Naukowe Akademii Marynarki Wojennej; 2011, R. 52 nr 4 (187), 4 (187); 61-71
0860-889X
Pojawia się w:
Zeszyty Naukowe Akademii Marynarki Wojennej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Dobrotiv Formation (Miocene) in the Boryslav-Pokuttya and Sambir nappes of the Ukrainian Carpathians : a record of sedimentary environmental change in the development of the Carpathian Foredeep Basin
Autorzy:
Oszczypko, N.
Uchman, A.
Bubniak, I.
Powiązania:
https://bibliotekanauki.pl/articles/2060063.pdf
Data publikacji:
2014
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
non-marine
deltaic sediments
molasse
mammal and bird footprints
Opis:
The late Early Miocene Dobrotiv Formation, a 700–800-m-thick unit, was deposited in a subsiding platform margin, which become involved in the marginal part of the Outer Eastern Carpathian accretionary wedge. The sedimentary succession from the Sloboda Conglomerate up to the Dobrotiv Formation records a transition from alluvial fan through fan-delta to deltaic deposits, followed by the fluvial plain-channel facies of the Stebnyk Formation. The deltaic deposits are mud-dominated, with poorly developed thickening-up packets of beds. Efficient sediment accumulation was balanced by subsidence caused by subsurface loading. Emerged parts of the deltaic sedimentary system include tetrapod footprints and raindrop imprints. The general absence of mudcracks in the Dobrotiv Formation suggests a humid climate. Deposits of the Sloboda, Dobrotiv and Stebnyk formations form fining- and thinning-upwards clastic wedge successions along the Ukrainian Carpathians.
Źródło:
Geological Quarterly; 2014, 58, 3; 393--408
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessing Heavy Metal Contamination in Marine Sediments Around the Coastal Waters of Mimika Regency, Indonesia
Autorzy:
Tanjung, Rosye Hefmi Rechnelty
Hamuna, Baigo
Yonas, Marcelino Novryanto
Powiązania:
https://bibliotekanauki.pl/articles/123537.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
marine sediments
heavy metals
contamination assessment
pollution load index
ecological risk
Mimika waters
Opis:
The heavy metal contamination has become a serious problem in the aquatic environment, including marine sediments. This study was aimed at analyzing the content of heavy metals in marine sediments, then assessing and evaluating the level of heavy metal contamination and its ecological risks. The sediment samples were taken using a grab sampler at six sites in the coastal waters of Mimika Regency, Indonesia. The TCLP testing method was used to determine the content of heavy metals in marine sediments. The results showed that the concentrations of Pb, Cu, Cd, and Hg in marine sediments ranged from <0.25 to 0.59 ppm, <0.02 to 0.54 ppm, <0.005 to 0.03 ppm, and < 0.0007 ppm. Only the concentrations of Cu on the Meoga and Puriri sites exceeded the quality standard in the Government Regulation of the Republic of Indonesia No. 18 year 1999. The results of the assessment of heavy metal contamination and its ecological risk potential indicate that the coastal waters of Mimika Regency are included in the category of low contamination and low ecological risks. The concentration of heavy metals in this study shows that the coastal waters of Mimika Regency are not contaminated by Pb, Cu, Cd, and Hg heavy metals.
Źródło:
Journal of Ecological Engineering; 2019, 20, 11; 35-42
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radionuclide activities in sediments on the northern coast of Spitsbergen
Autorzy:
Wojtasik, Barbara
Świrydowicz, Sławomir
Burska, Dorota
Nowiński, Kamil
Powiązania:
https://bibliotekanauki.pl/articles/2042160.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
137Cs
Arctic
fjords
freshwater sediments
marine sediments
natural radionuclides
Svalbard
Źródło:
Polish Polar Research; 2017, 38, 3; 291-312
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Konkrecje Fe-Mn z polskiego sektora Morza Bałtyckiego : stan wiedzy i potrzeba badań
Fe-Mn nodules from the Polish sector of the Baltic Sea : state of knowledge and need for research
Autorzy:
Zglinicki, Karol
Uścinowicz, Szymon
Łęczyński, Leszek
Szamałek, Krzysztof
Jegliński, Wojciech
Pączek, Urszula
Bylina, Paweł
Banaś, Michał
Powiązania:
https://bibliotekanauki.pl/articles/2076172.pdf
Data publikacji:
2021
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
morze Bałtyckie
osady morskie
konkrecje Fe-Mn
surowce krytyczne
Baltic Sea
marine sediments
Fe-Mn nodules
critical raw materials
Opis:
Studies on Baltic nodules have been undertaken since the1920s. In the 1970sand 1980s, the Polish Geological Institute - National Research Institute conducted researches on the bottom sediments of the Baltic Sea, which allowed identifying the regions of occurrence of Fe-Mn nodules in the southern part of the Baltic Sea (Mojski, 1989-1994). Nodules from the Polish Baltic Sea Zone are the least studied element of the marine environment. So far, there is a lack of information on environmental-geological conditions of formation and occurrence of nodules, their metal resources and deposit potential. The Fe-Mn nodules may be a valuable source of information on the contamination of the Baltic Sea water and bottom sediments. In cooperation between the Institute of Oceanography of the University ofGdañsk and the Polish Geological Institute-NRI, two research cruises were carried out in August and September 2020 on a 5 X 5 km testing ground in the Gotland-Gdańsk Threshold region. The seabed surface was profiled using multibeam echo sounders and a side-scan sonar. A hundred samples of Fe-Mn nodules, 25 samples of surface sediments associated with the nodules, and25 samples of clay rocks underlain by marine sediments were collected. The extensive documentary material will enable, for the first time, to estimate the nodule resources and determine the regularity of their occurrence.
Źródło:
Przegląd Geologiczny; 2021, 69, 3; 161--168
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Cyclops Mountains Massif (New Guinea, Indonesia) as the provenance area for metal-bearing shelf sediments from the Carolinian Sea
Autorzy:
Zglinicki, Karol
Szamałek, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/2059672.pdf
Data publikacji:
2020
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
continental shelf sediments
Cyclops Mountains
New Guinea
heavy minerals
geological prospection
marine minerals
Opis:
In 2009, on the initiative of PT Halmahera Perkasa the “Jayapura” exploration project was carried out in Indonesia. As part of this project, exploration of the sea bottom in the northern coast of New Guinea was carried out over a distance of ~45 km. The suction dredge collected 59 samples of loose sediments from the shelf bottom surface of the Carolinian Sea (to a depth of 60 m below the sea-floor). The extracted samples are usually poorly and moderately sorted sands (5 samples), medium-grained sands (21 samples), and fine-grained sands (33 samples). The sand composition shows, among others, a wide spectrum of heavy minerals of ultra-mafic (Cr-garnet, chromium spinel, Mg-olivine) and metamorphic (epidote, clinochlore, amphibole, titanite) origin. The content of heavy minerals in the sediments is up to 54.77 wt.%. It was found that the source of heavy fraction in the eastern and western parts of the coast is the rock of the ophiolite series building the Cyclops Mountains Massif. The mineral composition of sediments from the central coastal zone corresponds to the types of rocks building the metamorphic core of the Cyclops Mountains (amphibolite, gneisses, andesite). Three mineral-geochemical subprovinces were determined on the basis of analyses of heavy mineral decomposition and chemical analyses of sediments. Shelf sediment from the eastern part of the coast is characterized by an increased content of strategic metals (Ni up to 3560, W up to 3130 and Co up to 142 ppm). In the central zone, the V content increases up to 244 ppm and the Ag content up to 5 ppm. In the shelf sediments there is a strong depletion in the REE.
Źródło:
Geological Quarterly; 2020, 64, 2; 480--491
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-10 z 10

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