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Wyszukujesz frazę "erosion of the coastal zone" wg kryterium: Wszystkie pola

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    Wyświetlanie 1-8 z 8
    Tytuł:
    Hydraulic analysis of causes of washout of Gdynia-Orłowo sea-shore during the flood in the Kacza river estuary
    Autorzy:
    Szydłowski, Michał
    Powiązania:
    https://bibliotekanauki.pl/articles/258872.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    hydrodynamics
    flood
    erosion of the coastal zone
    Kacza river
    Gdynia
    Opis:
    In July 2016 in the Three-city agglomeration a rainfall episode of over a day duration and 150 mm summary rainfall height, occurred. This situation, extreme as for Polish conditions, caused significant freshets in rivers and streams running into Gdansk Bay, the Baltic Sea, and serving as collectors of rainfall waters for the sea-coast towns. In many areas of the Three-city flood phenomena and overflows took place. The flood also occurred in the catchment area of the Kacza river in Gdynia. The passing of flood water rise caused damage of many infrastructure objects located along the river valley. The estuary section of the river suffered most, especially sea-shore belt together with beach around the estuary which were significantly washed out. In this paper an approach was made to answer to the question on direct causes of the situation which occurred at the estuary of the Kacza river. To this end, there was worked out a hydrodynamic model of the considered section of the river, based on the solving of two-dimensional differential motion equations of free-surface liquid, and simulations of water flow propagation along the river’s valley were performed for a few variants of hydraulic engineering infrastructure of river bed. Numerical hydraulic analysis made it possible to determine a role of the hydraulic engineering objects in forming the flood water rise as well as their impact on location and range of washout zones of sea-shore belt.
    Źródło:
    Polish Maritime Research; 2019, 1; 174-182
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polish coastal zone erosion in the aspect of need for coastal defence
    Autorzy:
    Zawadzka, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1920421.pdf
    Data publikacji:
    1999
    Wydawca:
    Instytut Morski w Gdańsku
    Tematy:
    coastline
    erosion
    coastal defence
    Opis:
    The balance of changes of the position of the coastline and of land area changes, made for the period 1875-1979, and of changes of the waterline and dune/cliff foot line for the period 1960-1983, has shown that in the last decades erosional processes are steadily increasing. At present 22% ( 110 km) of the Polish coastline is protected by structures. The growing rates of erosion, and the widening reach of damages, indicate that coastal protection works should be intensified and/or the hitherto used method should be verified.
    Źródło:
    Biuletyn Instytutu Morskiego w Gdańsku; 1999, 26, 2; 49-55
    1230-7424
    2450-5536
    Pojawia się w:
    Biuletyn Instytutu Morskiego w Gdańsku
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The impact of Klaipeda Port entrance channel dredging on the dynamics of coastal zone, Lithuania
    Autorzy:
    Zilinskas, G.
    Janusaite, R.
    Jarmalavicius, D.
    Pupienis, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2079089.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    Klaipeda Port
    Southern Baltic
    Lithuania
    entrance channel
    dredging
    coastal zone
    sediment transport
    lithodynamic condition
    coastal erosion
    Opis:
    Dredging entrance channels to ports on open littoral drift seashores often causes major morphological changes to the shoreline. This study aims to assess the impact of dredging the Port of Klaipėda's entrance channel and the construction of the jetties on the coastal zone. Based on an analysis of cartographic material collected between 1835 and 2017, and on field data (bathymetric surveys and cross-shore profile levelling), changes to the coastal zone in the area nearest to the port were evaluated. The dominant longshore sediment transport on the Lithuanian nearshore runs from south to north. Thus, based on established patterns, intensive accretion could have been expected to take place on the southern side of the port jetties and erosion on their northern side. However, in the case of the Port of Klaipėda, in the area nearest to the port on the updrift side of the port jetties, where accretion would have been expected to take place, the nearshore depth increased throughout the 20th century (when the length and configuration of the jetties did not change). The shoreline shifted landward instead of moving further out to sea. The present study shows that the intensive dredging of the entrance channel caused nearshore and shore erosion on the updrift side of the port jetties, even while a sufficient sediment load was being transported by the longshore drift.
    Źródło:
    Oceanologia; 2020, 62, 4PA; 489-500
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of Dune Erosion on the Coast of South Baltic Sea Taking into Account Dune Landslide Processes
    Autorzy:
    Szmytkiewicz, P.
    Zabuski, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/240996.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    South Baltic coastal zone
    dunes
    erosion
    landslide process
    Opis:
    An analysis was carried out to determine the influence of landslide process at a few meters depth under the dune surface on the rebuilding of the dune. In the first step, calculations were done using the XBEACH model to determine seabed rebuilding as well as shore and dune undercutting for the assumed hydrologic and hydrodynamic conditions. Next, the obtained tachymetric profile of the dune and beach was fed into the FLAC2D program, and calculations of stress distribution, displacements and stability conditions were made. In this way, landslide movement was identified. The theoretical investigations clearly prove that waves attacking the dune not only cause surface erosion, but also trigger a landslide within the dune mass to a maximum depth of about 5 m. It results in a lowering of the dune crown by about 0:6 0:7 m. Numerical models such as XBEACH, SBEACH or CSHORE do not take into account landslide occurrence, and thus underestimate dune erosion.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2017, 64, 1; 3-15
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Remote-sensing observations of coastal sub-mesoscale eddies in the South-Eastern Baltic
    Autorzy:
    Gurova, E.
    Chubarenko, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/47699.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    remote sensing
    submesoscale eddy
    coastal zone
    Baltic Sea
    MODIS satellite image
    ASAR satellite image
    orography
    bottom topography
    erosion
    oil-field platform
    turbidity
    coastal water
    coloured dissolved organic matter
    Źródło:
    Oceanologia; 2012, 54, 4
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zmiany rzeźby klifu w rejonie Ustki jako efekt warunków litologicznych oraz procesów ekstremalnych i przeciętnych
    Lithological and extreme event control of changes in cliff morphology in the Ustka region
    Autorzy:
    Florek, W.
    Kaczmarzyk, J.
    Majewski, M.
    Olszak, I. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/294873.pdf
    Data publikacji:
    2008
    Wydawca:
    Stowarzyszenie Geomorfologów Polskich
    Tematy:
    abrazja
    klif
    wybrzeże południowego Bałtyku
    strefa brzegowa
    litologia
    abrasion
    erosion
    cliff
    South Baltic coast
    coastal zone
    lithology
    Opis:
    Od ponad ośmiu lat autorzy prowadzą badania, których celem jest określenie tempa zmian klifu i plaży w cyklach sezonowych i w wieloleciu, z uwzględnieniem roli ekstremalnych zjawisk hydrodynamicznych. Do celów prowadzonych prac należy także zaliczyć weryfikację dotychczasowych poglądów na temat znaczenia poszczególnych czynników decydujących o tempie i charakterze zmian nadbrzeża (budowa geologiczna, warunki hydrodynamiczne, czynniki antropogeniczne i in.). Autorzy realizują swoje cele badawcze głównie poprzez pomiary geodezyjne wybranych profili klifowych, a także rozpoznanie budowy geologicznej klifów, rejestrację mezo- i mikroform klifowych i plażowych oraz analizę danych meteorologicznych i hydrologicznych. Obserwacje autorów wskazują, że procesy abrazji i procesy masowe nie „konkurują” ze sobą w formowaniu strefy nadbrzeża, a tworzą swoistą sekwencję, w której abrazja związana ze sztormami i wysokimi stanami morza prowadzi do „wystromienia” klifu, zaś rola procesów stokowych (obrywania, osypywania i osuwania) ujawnia się w okresach bezsztormowych i prowadzi do „wygładzenia” profilu klifu. Stwierdzono też, że duże sztormy, które wystąpiły późną jesienią 2004 r., a także w sezonach 2005/06 i 2006/07, wpłynęły na uaktywnienie klifów w dziewięciu z dziesięciu badanych profili, jednak zakres zaobserwowanej abrazji jest dużo mniejszy od oczekiwanego.
    Monitoring of cliff cross profile changes in the Ustka area have been carried out by the authors for more than 8 years. The aim of the project has been to verify the validity of the model suggested by different authors before, who described patterns of cliff development in the area. For example, certain observations on the South Baltic cliffs have led to the preliminary conclusion that the role played by geological conditions and related hydrogeological features in differentiating rates of cliff evolution is more important than assumed so far. The measurements in the controlled cliff profiles have yielded the following results: – beaches are the most dynamic areas in the onshore part. They undergo periodical changes, accreting from spring to summer and being eroded in autumn and winter; – upper sections of the cliffs, typically built of aeolian sand, are least resistant. Hence, they are subject to mass movement, particularly in summer, under impact of vacationers. As a consequence, sandy taluses and aprons form in the depositional area near the cliff base; – toes of landslide tongues in Poddąbie and Dębina are now being progressively abraded. The slide in Dębina was reactivated during winter seasons 2005/2006 and 2006/2007, causing further enlargement of the landslide niche; – after extreme storms beach accretion takes place in coastal sections located eastward from the most abraded cliffs, e.g. between Rowy and Czołpino, east from the landslide-affected areas at Poddąbie and Dębina. In the 2005–2007 period a significant increase in beach width has been observed. Nevertheless, it is difficult to offer serious conclusions at this stage, particularly because a series of big storms has not occurred recently. Detailed measurements described in this paper will be supplemented by detailed analysis of the geological structure of cliffs and of geomorphology and geology in offshore area.
    Źródło:
    Landform Analysis; 2008, 7; 53-68
    1429-799X
    Pojawia się w:
    Landform Analysis
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of geomorphological processes and phytoclimate conditions change on forest vegetation in the Pomeranian Bay coastal zone (Wolin National Park, West Pomerania)
    Autorzy:
    Tylkowski, Jacek
    Paluszkiewicz, Renata
    Winowski, Marcin
    Czyryca, Paweł
    Kostrzewski, Andrzej
    Mazurek, Małgorzata
    Rachlewicz, Grzegorz
    Powiązania:
    https://bibliotekanauki.pl/articles/52495795.pdf
    Data publikacji:
    2023
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    forest vegetation
    cliff edge zone
    erosion and denudation processes
    phytoclimatic conditions
    Pomeranian Bay
    Wolin Island
    Opis:
    The functioning of plant associations, including forest associations, in the coastal cliff edge zone of the Pomeranian Bay in the Wolin National Park (WNP) is determined by short-term factors related to the dynamics of erosion and denudation processes and long-term phytoclimatic conditions’ changes. The study presents a temporary analysis of the occurrence of sea abrasion and water and aeolian erosion, based on the applied hydrometeorological threshold values. The influence of changes in phytoclimatic conditions on the development and productivity of coastal forests with the dominant species of Fagus sylvatica was also presented. Assessments of spatial susceptibility to erosion of the cliff coast and the existing plant associations were also carried out in conditions of the risk of coast erosion. It was found that 55% of the cliff edge zone of the Pomeranian Bay of the WNP and the forest associations (mainly Luzulo pilosae-Fagetum) occurring there are in the zone of particular risk of increased erosion and denudation processes. In addition, unfavourable trends in changes in phytoclimatic conditions in the 21st century were found, which reflect climate changes unfavourable to the development of beech forests on Wolin Island.
    Źródło:
    Quaestiones Geographicae; 2023, 42, 1; 141-160
    0137-477X
    2081-6383
    Pojawia się w:
    Quaestiones Geographicae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Basic for a valuation of the Polish Exclusive Economic Zone of the Baltic Sea: Rationale and quest for tools
    Autorzy:
    Weslawski, J.M.
    Andrulewicz, E.
    Kotwicki, L.
    Kuzebski, E.
    Lewandowski, A.
    Linkowski, T.
    Massel, S.R.
    Musielak, S.
    Olanczuk-Neyman, K.
    Pempkowiak, J.
    Piekarek-Jankowska, H.
    Radziejewska, T.
    Rozynski, G.
    Sagan, I.
    Skora, K.E.
    Szefler, K.
    Urbanski, J.
    Witek, Z.
    Wolowicz, M.
    Zachowicz, J.
    Zarzycki, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/47570.pdf
    Data publikacji:
    2006
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    marine environment
    erosion
    mineral resource
    biofiltration
    Polish Exclusive Economic Zone
    economic valuation
    Baltic Sea
    ecosystem
    marine ecosystem
    coastal sand
    fish resource
    Opis:
    This paper summarises current knowledge of goods and services in the Polish Exclusive Economic Zone of the Baltic Sea ecosystem. It reviews specific properties of the Baltic that could be used for economic valuation. Goods and services range from the familiar resources of fish and minerals, which were valued with the Productivity Method, to less obvious services provided by the ecosystem such as biofiltration in coastal sands, valued with either the Replacement Cost or Damage Cost Avoided methods. Disservices to the marine ecosystem are also considered, e.g. erosion and coastal flooding, including the costs of planned mitigating measures. This paper emphasises the importance of using valuation methods to help make better-educated decisions for the sustainability of the Baltic Sea.
    Źródło:
    Oceanologia; 2006, 48, 1
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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