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    Wyświetlanie 1-2 z 2
    Tytuł:
    Transgresja morska i jej skutki
    Marine transgression and its effects
    Autorzy:
    Rotnicki, Karol
    Powiązania:
    https://bibliotekanauki.pl/articles/1197484.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Przyrodników im. Kopernika
    Opis:
    The paper assesses the current state of knowledge about marine transgressions in the past and the contemporary sea-level rise as a result of a global change in the climate, viz. its warming. Next, the main tectonic and climatic causes of absolute and relative changes in the sea-level are considered. Marine transgressions controlled by climate are caused by melting of glaciers, inland ices and permafrost. Warming of ocean water due to rise of atmospheric temperature is the next reason of sea level rise and marine transgression. In consequence, low lying areas, like river deltas, coastal alluvial plains, sandy barriers and coral islands are flooded. The tendency and rate of the sea-level rise over the last 150 years is discussed against the background of what we know about the recent geological past, namely the end of the last Pleistocene Glaciation, during which the rate of sea-level change was much more rapid than today. Great marine transgression was the result of disappearance of inland ices, ice caps, and permafrost since 20 thousands years. In consequence, many areas were flooded and coast lines were shifted some tens and hundreds kilometers. The rate of the present day sea-level rise is abot 3.3±0.4 mm r-1 and seems to be accelerated. Our knowledge of the past warns us that a rise in the sea-level of 0.5 m over the next one hundred years is a real danger for all low lying areas which are dense populated. In turn, an estimation is made of the sea-level rise by the year 2100, and the physical effects of this process on coastal zone. In the Polish coastal zone the threatened area include 1720 km2, mainly in the Vistula River Delta and in the Lower Odra valley in the vicinity of the Szczecin Haff. The paper closes with a discussion of the choise of responses to the danger for the coastal zone posed by the sea level rise that are open to man.
    Źródło:
    Kosmos; 2008, 57, 3-4; 225-239
    0023-4249
    Pojawia się w:
    Kosmos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stages of the formation of the Łeba barrier-lagoon system on the basis of the geological cross-section near Rąbka (Southern Baltic Coast, Poland)
    Autorzy:
    Rotnicki, Karol
    Alexandrowicz, Stefan W.
    Pazdur, Anna
    Goslar, Tomasz
    Borówka, Ryszard K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2026416.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sand barriers
    lagoons
    Holocene barrier- lagoon system
    Polska
    southern Baltic coast
    Opis:
    The ar ti cle pres ents the re sults of a de tailed study of the geo log i cal struc ture of the £eba Bar rier in the R¹bka crosssec tion (South ern Bal tic, Po land). The bar rier sep a rates Lake £ebsko from the Bal tic. Five sed i men tary com plexes were dis tin guished there (M2–M6). The spa tial vari abil ity of the grain-size dis tri bu tion was ex am ined and suc ces sion stages of the mol lusc fauna oc cur ring in the in di vid ual sed i men tary com plexes were dis tin guished. Ra dio car bon dating was used to es tab lish the age of the most im por tant events dur ing the pro cess of for ma tion of the bar rier, which took place in the course of sev eral rel a tive sea-level changes. The first sed i men tary com plex (M2) at R¹bka is connected with the sec ond ingression (i2) of the Bal tic Sea (ca. 6,700–6,000 14C years BP), sea-level sta bi li za tion (6,000–5,500 14C years BP), and at last sea-level low er ing (5,500–5,000 14C years BP) in the re gion of the Gardno-£eba Coastal Plain. The sed i men tary com plex M3 de vel oped in a la goonal en vi ron ment when the bar rier was sit u ated north of its pres ent po si tion (5,000–3,000 14C BP). The next low er ing of the sea-level made the la goon shal lower and caused the emer gence of small but al ready subaerial stretches of bar rier land with a fresh wa ter fauna in the north (4,880±40 14C BP). With the next ingression stage (i3), which took place be tween 4,500 and 3,000 BP, the bar rier shifted to its pres ent-day po si tion and the la goon changed into a fresh wa ter lake. From 3,000 to 1,700 14C BP fos sil soil and peats de vel oped on the bar rier sur face as a re sult of an other sea-level low er ing. The last ingression stages (i4 and i5), youn - ger than 1,700 BP, built up the bar rier, prac ti cally in its to day’s lo ca tion (sed i men tary com plexes M4 and M5). The youn gest sed i men tary com plex (M-6) is rep re sented by pres ent-day beach sands.
    Źródło:
    Studia Quaternaria; 2009, 26; 3-24
    1641-5558
    2300-0384
    Pojawia się w:
    Studia Quaternaria
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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