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    Wyświetlanie 1-5 z 5
    Tytuł:
    Modeling of Groundwater Pollution by Former Seawater in Submarine Groundwater Discharge Driven by Saltwater Intrusion
    Autorzy:
    Al-Taliby, Wissam
    Dekhn, Hadeel
    Powiązania:
    https://bibliotekanauki.pl/articles/2026744.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    saltwater intrusion
    SEAWAT
    submarine groundwater discharge
    groundwater
    Opis:
    Coastal aquifers are usually vulnerable to contamination by saltwater intrusion. The degree of contamination depends on the amount of former seawater intruding the aquifer as submarine groundwater discharge (SGD). A three-dimensional numerical SEAWAT model was developed to provide insights to the responses of saltwater intrusion and amount of seawater portion of SGD, to groundwater withdrawal from four wells at different spatial locations. The results showed that saltwater wedge encroachment varies with a withdrawal rate and well location. Increasing withdrawal rates from 0.165 $m^3$/s to 0.53166 $m^3$/s resulted in a noticeable increase in wedge encroachment into the aquifer from 589 m to 1319 m, respectively, regardless of the distance from the coastline. However, higher withdrawals from the wells closer to the coastline caused the hydraulic head near the seaside to drop below the terrestrial head, causing the saltwater wedge to be pushed back toward the sea. Simulations also showed that a coastal well might act as a hydraulic barrier that prevents the brackish zone from moving further inland, which is critically important in terms of groundwater management. Seawater contributed from 5% to above 33% in SGD. Although the withdrawal rates from Well 3 were 10 to 20 times larger than the Well 2 rates, the seawater contribution associated with Well 3 was about the same. This is attributed to the horizontal vicinity of Well 2 to the seacoast boundary compared to Well 3 even though Well 3 is deeper than Well 2, demonstrating that it is the horizontal location that governs the amount of abstracted former seawater.
    Źródło:
    Journal of Ecological Engineering; 2022, 23, 2; 166-175
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Groundwater conditions along the seawater/freshwater interface on a volcanic island and a depositional area in Japan
    Autorzy:
    Marui, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2058825.pdf
    Data publikacji:
    2003
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    submarine groundwater discharge
    seawater/freshwater interface
    groundwater flow
    far-east area
    Opis:
    Fresh groundwater comes in contact with seawater at the downstream end of its flow system. Most previous work has discussed the shape of the seawater/freshwater interface on the basis of Ghyben-Herzberg’s law. The groundwater, however, pushes the seawater farther offshore side than predicted by the law, giving rise to freshwater flows even below the bottom of the sea. A previous study found that the distribution of submarine groundwater discharge and the point of the seawater/freshwater interface on the marine floor are closely related. The cross-sectional shape of the interface onshore is clarified by using electrical tomography and observation of groundwater and soil samples taken from observation wells located in the coastal area (by a volcanic island and associated deposits). In both fields, diving was carried out to find the submarine groundwater discharge on the sea-floor and to take water samples. From the analysis of the water discharged on the marine floor and/or electric conductivity measurements in the marine sands, it is shown the freshwater flows (discharges) along the interface, even in the submarine deposits. The understanding of groundwater flows at the downstream end of the groundwater flow system (from mountainous to marine) will facilitate the development of water resources and the evaluation of environments.
    Źródło:
    Geological Quarterly; 2003, 47, 4; 381-388
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Regularities in the transformation of coastal and accumulative forms of sea bottom relief, with application for water management
    Autorzy:
    Kapochkin, B.
    Kucherenko, N.
    Kapochkina, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/108437.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Meteorologii i Gospodarki Wodnej - Państwowy Instytut Badawczy
    Tematy:
    accumulative form
    sea bottom relief
    coast
    submarine groundwater
    tectonic fault
    Opis:
    Investigate the processes of formation of accumulative forms of sea bottom relief and coast. The coincidence of the linear parts of the accumulative sea bottom relief with the direction of tectonic faults. Provides examples exploring the coast of the Atlantic Ocean, the Baltic, Black and Azov Seas. Consider the problem of continuing in the sea geological structures on dry land. On the example of the Azov Sea it was shown that the horst on land in the coastal zone is shown a linear zone of eroded beaches. Sustainable shore erosion are confined to the gorst. Graben on land continues at sea accumulative forms of type foreland. The accumulation zone of sediment are confined to grabens. Shown that different direction storms form accumulative relief in accordance with clear rules. Random exogenous factors are controlled regularities endogenous processes. Endogenous formation of sea bottom relief happens resulting impact endogenous processes on the speed currents. In those locations where currents slows down the sand falls to the bottom. Decrease in speed currents occurs lengthwise tectonic faults. Faults is the migration path lithospheric fluids. To elucidate the reasons for the formation of specific conditions sediment load was carried out mathematical modeling of currents over a linear zone submarine groundwater discharge. Hydrodynamic software decides system of Navier-Stokes equations. Made mathematical modeling the interaction currents and the water flowing from a tectonic fault.
    Źródło:
    Meteorology Hydrology and Water Management. Research and Operational Applications; 2014, 2, 2; 43-48
    2299-3835
    2353-5652
    Pojawia się w:
    Meteorology Hydrology and Water Management. Research and Operational Applications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hydrogeochemistry and magnitude of SGD in the Bay of Puck, Southern Baltic Sea
    Autorzy:
    Klostowska, Z.
    Szymczycha, B.
    Lengier, M.
    Zarzeczanska, D.
    Dzierzbicka-Glowacka, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/47678.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    hydrogeochemistry
    submarine groundwater discharge
    seasonal variability
    spatial variability
    Puck Bay
    Baltic Sea
    Źródło:
    Oceanologia; 2020, 62, 1
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Significance of nutrient fluxes via submarine groundwater discharge in the Bay of Puck, Southern Baltic Sea
    Autorzy:
    Szymczycha, B.
    Klostowska, Z.
    Lengier, M.
    Dzierzbicka-Glowacka, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/2079294.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    nutrient flux
    nitrogen
    phosphorus
    submarine groundwater discharge
    biogeochemistry
    coastal zone
    Puck Bay
    Southern Baltic Sea
    Opis:
    In this study, we collected submarine groundwater discharge (SGD) and seawater samples at six sites in the Bay of Puck, in the southern Baltic Sea, in order to estimate the nutrient distribution in groundwater affected areas. In addition, we estimated nutrient fluxes via SGD, including both fresh SGD (FSGD) and recirculated seawater SGD (RSGD), to the entire Bay of Puck. Phosphate (PO43−) concentrations varied significantly among study sites and seasons, while both ammonium (NH4+) and nitrates (NO3−) concentrations varied only seasonally. The N:P ratio indicated P limitation in most of the samples. The estimated seasonal and annual loads, via SGD, of both dissolved inorganic nitrogen (DIN; 9303 t yr−1) and PO43− (950 t yr−1), were the most significant source of nutrients to the Bay of Puck, and notably higher than quantified before (FSGD nutrient loads of 50 t yr−1 and 56 t yr−1 for DIN and PO43−, respectively). The SGD fluxes reported here indicate some of the highest rates of sediment-water fluxes reported in the Baltic Sea. These results suggest that SGD (both FSGD and RSGD) should be considered as source of chemical substances to the marine environment.
    Źródło:
    Oceanologia; 2020, 62, 2; 117-125
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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