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    Wyświetlanie 1-2 z 2
    Tytuł:
    Causes of groundwater level and chemistry changes in an urban area; a case study of Warsaw, Poland
    Autorzy:
    Krogulec, Ewa
    Gruszczyński, Tomasz
    Kowalczyk, Sebastian
    Małecki, Jerzy J.
    Porowska, Dorota
    Sawicka, Katarzyna
    Trzeciak, Joanna
    Wojdalska, Anna
    Zabłocki, Sebastian
    Zaszewski, Daniel
    Powiązania:
    https://bibliotekanauki.pl/articles/24024702.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    urban area
    Quaternary aquifer
    Oligocene aquifer
    groundwater level changes
    infiltration
    groundwater chemistry
    Warsaw
    obszar miejski
    czwartorzędowe piętro wodonośne
    oligoceńskie piętro wodonośne
    zmiany poziomu wód gruntowych
    infiltracja
    chemizm wód podziemnych
    Warszawa
    Opis:
    The presented studies focus on changes in groundwater levels and chemistry, and the identification of important factors influencing these changes on short- and long-term scales in urban areas. The results may be useful for rational and sustainable groundwater planning and management in cities. The studies concerned three aquifers: (1) the shallow Quaternary aquifer, (2) the deep Quaternary aquifer, and (3) the Oligocene aquifer in the capital city of Warsaw (Poland). The spatial variability of groundwater recharge was determined and its changes in time were characterized. The characteristics of groundwater levels were based on long-term monitoring series. The results indicate that urban development has caused overall reduction in infiltration recharge (from 54 to 51 mm/year), which is particularly clear in the city suburbs and in its centre, where land development has significantly densified during the last 30 years. Studies of groundwater levels indicate variable long-term trends. However, for the shallowest aquifer, the trends indicate a gradual decrease of the groundwater levels. In the case of the much deeper Oligocene aquifer, groundwater table rise is observed since the 1970s (averagely c. 20 m), which is related with excessive pumping. Based on the studied results, the groundwater chemistry in the subsurface aquifer indicates strong anthropogenic influence, which is reflected in multi-ionic hydrogeochemical types and the occurrence of chemical tracers typical of human activity. The Oligocene aquifer is characterized by a chemical composition indicating the influence of geogenic factors.
    Źródło:
    Acta Geologica Polonica; 2022, 72, 4; 495--517
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ obiektów głęboko posadowionych na strukturę strumienia filtracji wód podziemnych w obszarze wrażliwym na zmiany warunków hydrogeodynamicznych
    Impact of deep foundations on the groundwater flow structure in the hydrogeodynamically vulnerable area
    Autorzy:
    Opęchowski, Konrad
    Krogulec, Ewa
    Powiązania:
    https://bibliotekanauki.pl/articles/2075930.pdf
    Data publikacji:
    2019
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    efekt zapory
    głębokie podłoże
    struktura przepływu wód podziemnych
    monitorowanie poziomu wód gruntowych
    skumulowane skutki
    urbanizacja
    Warszawa
    dam effect
    deep foundation
    groundwater flow structure
    groundwater level monitoring
    cumulative impacts
    urbanization
    Warsaw
    Opis:
    The progressive citification of urban spaces results in compacting buildings and deeper foundation of new objects, and even deepening of existing facilities - to obtain maximum use of underground space. This process significantly interferes with the geological environment, both in the local (single deep foundation objects) and district (linear objects such as subways, tunnels, sewage collectors, groups of deep foundation objects). In Warsaw, underground urbanization extends several dozen meters deep and reaches the upper parts of the Neogene deposits, often fully intersecting Quaternary deposits. The progressing urbanization, and in particular the cumulative influence of deep foundation structures, creates a new set of factors with a potentially significant impact on the hydrogeological conditions of the Quaternary aquifer, including also the deep-seated aquifer, so far not having placed under a direct hydrogeodynamic impact. This article presents an assessment of the impact of underground development on the groundwater flow structure, with a particular emphasis on the deformation of the filtration mesh as a permanent result of object built-in into the groundwater stream. The analysis is based on the real case study of the implementation of a building located in the area vulnerable to hydrogeodynamic changes, where additionally can occur a cumulative impact with underground subway tunnels. Model simulations of the building foundation impact on the hydrogeodynamic conditions of the environment were performed. The results of prognostic model calculations were compared with the observations of changes in the groundwater level during construction works. The results indicate slight, permanent changes in groundwater levels, an increase in hydraulic gradients and changes in water flow directions. The scope of the changes was considered safe for the environment and building objects, allowing even a deeper foundation, although not devoid of the need for a long-term observation of groundwater levels. The obtained results indicate the usefulness and utilitarianity of numerical modeling methods in the analysis of hydrogeological conditioning of deep foundations.
    Źródło:
    Przegląd Geologiczny; 2019, 67, 6; 478--486
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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