Temat: beach - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Morfodynamika sztucznie zasilonej plaży Bałtyku pomiędzy Gdańskiem a Sopotem
Morphodynamics of the replenished Baltic beach between Gdańsk and Sopot
Autorzy:: Jobska, Aleksandra
Rucińska, Maria
Powiązania:: https://bibliotekanauki.pl/articles/2076206.pdf
Data publikacji:: 2021
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: morfodynamika
sztucznie zasilona plaża
plaża
osad na plaży
Zatoka Gdańska
morphodynamics
beach replenishment
beach
beach sediment
Gulf of Gdańsk
Opis:: The research area is located on the coast of the Baltic Sea, along the Gulf of Gdańsk. It includes a beach where sand replenishment was carried out in 2019. The aim of the study was to investigate the morphodynamics of beach deposits in replenishing and non-replenishing areas during one year. No environmental dynamic conditions sufficient to alter significantly the beach morphology and sediment characteristics occurred during the study period, November 2019 to August 2020. One storm event was recorded, but did not significantly affect the beachform. The transverse beach profiles, which were artificially recharged in June 2019, were lowered by 0.6 to 1.2 m. The greatest changes were caused by the erosive activity of the waters of the Jelitkowski Stream.
Źródło:: Przegląd Geologiczny; 2021, 69, 7; 443--447
0033-2151
Pojawia się w:: Przegląd Geologiczny
Dostawca treści:: Biblioteka Nauki

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Tytuł:: Black sand properties in beach-dune system, Patea Beach, North Island, New Zealand
Autorzy:: Dłużewski, Maciej
Hilton, Mike
Muszyński, Andrzej
Rotnicka, Joanna
Woronko, Barbara
Powiązania:: https://bibliotekanauki.pl/articles/2060113.pdf
Data publikacji:: 2021
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: titanomagnetite
black sand
beach-dune deposits
grain size distribution
grain shape
microtexture
aeolian sorting
Opis:: The study focuses on sand grain properties in different parts of a beach-dune system built entirely of heavy mineral particles. These properties are related to: (1) resistance of particular minerals to weathering and abrasion, (2) hydraulic sorting in the swash zone, and (3) aeolian sorting during grain transport inland from the upper beach. The main waterlain and windlain sand properties depend on settling velocity which results from grain density (reflecting grain mineralogy), size, shape and roundness. The study was performed on the beach and dunes at Patea on the west coast of the North Island of New Zealand, which are comprised of heavy minerals assemblage containing a ferromagnetic (dominated by titanomagnetite) and non-ferromagnetic (mainly pyroxene and amphibole) fractions. The result demonstrates that three zones of different sand properties can be distinguished: (1) a lower swash zone dominated by non-ferromagnetic, larger and more angular particles which are carried back from the upper swash zone down the foreshore by the backwash; (2) an uppermost swash zone and beach with almost 100% of ferromagnetic, smaller and more rounded particles deposited at the back of the beach by the uprush, which during high tide and storms can reach the cliff toe, and can be reworked by wind; and (3) a climbing dune composed of a more poorly sorted mixture of non- and ferromagnetic particles. In terms of both mineralogy and grain size and shape, the dune sand is less uniform than the beach sand. Aeolian segregation resulted here in sand textural features opposite to those found in dune sands composed of light minerals. The results highlight the density-dependent variability of grain size and shape of beach-dune deposits consisting of only heavy minerals, and broaden our understanding of mechanisms of sedimentary processes which is particularly important when reconstructing older sedimentary successions.
Źródło:: Geological Quarterly; 2021, 65, 3; 65: 35
1641-7291
Pojawia się w:: Geological Quarterly
Dostawca treści:: Biblioteka Nauki

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Tytuł:: The Holocene sedimentation history of Lake Vortsjärv, central Estonia
Autorzy:: Raukas, A.
Tavast, E.
Powiązania:: https://bibliotekanauki.pl/articles/2059934.pdf
Data publikacji:: 2002
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: Estonia
Holocene
ice lakes
glacioisostatic uplift
shore types
bottom and beach deposits
water-level fluctuations
Opis:: Lake Vortsjärv is one of the biggest lakes in Eastern Europe and possesses a complex geological history. Bottom deposits consist mostly of fine sand and silt, accompanied with sapropel (up to 9 m thick) and lake marl (up to 8 m thick). In places, especially in the northern part where the bottom deposits are absent, varved clay or till are exposed in the lake basin. In the southern part of the lake the deposits are much thicker, indicating a gradual rise of water-level. Like the majority of lakes in the Northern Hemisphere, Lake Vortsjärv possesses a more open eastern and a more swampy and overgrown western bank. Shore types and the lithological composition of shore sediments are varied and highly controlled by the bedrock and glacial deposits. Long-shore transport of sediments is limited. The mineral composition of bottom sediments shows great qualitative and quantitative variability which relates to the grain-size and petrography of the parent deposits. Organic-rich sapropel can be used in agriculture and evidently also for medicinal purposes.
Źródło:: Geological Quarterly; 2002, 46, 2; 199-206
1641-7291
Pojawia się w:: Geological Quarterly
Dostawca treści:: Biblioteka Nauki

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