Zmienność współczynnika filtracji w strefie hyporeicznej w świetle badań laboratoryjnych

• Autorzy: Marciniak M. , Szczucińska A. , Kaczmarek M.

Warianty tytułu

EN

Variability of the hydraulic conductivity in the hyporheic zone in the light of laboratory research

• Konferencja: Współczesne Problemy Hydrogeologii ( XVIII; 2017; 8–10.11.2017; Wojanów , Polska)
• Języki publikacji: PL

Abstrakty

EN

The interaction between surface water and groundwater throughout the hyporheic zone determines the diurnal water level fluctuations in springs, streams and lakes. The previous studies have listed evapotranspiration, variability of hydraulic conductivity in the hyporheic zone, melting andfreeze-thawing processes, thermal expansion and water viscosity among the factors responsible for the water level diurnal fluctuations. The aim of the research was to investigate the variability of hydraulic conductivity in the hyporheic zone and its impact on the diurnal fluctuations of the water level. Experimental series were performed in laboratory conditions using seepage columns. Four types of sand sediments, with a hydraulic conductivity ranging from 6x10^-6 to 5x10^-4 m/s, were tested. The obtained values of hydraulic conductivity appeared to depend on the sand grain size, temperature, the direction of the hydraulic gradient, and the fluidization of the sediment (flowing sand). In all tests, higher hydraulic conductivity values were observed when water was set to flow in the direction opposite to gravity (flow up) rather than downward (flow down). In the sediments, which have not reached the state of fluidization, with an increase of the hydraulic gradient, values of hydraulic conductivity were two times higher during flow up than in the case of flow down. In the case of sediments being fluidized, the obtained values of hydraulic conductivity were roughly 3 times higher. The initiation of the fluidization process has been observed at the hydraulic gradient close to one. The results of laboratory experiments allow for a better understanding of the factors that have impact on diurnal fluctuations of the water level, especially when seepage of groundwater is present. Fluidization of the hyporheic zone after precipitation or thawing events may inhibit diurnal fluctuations.

Słowa kluczowe

PL

strefa hyporeiczna; współczynnik filtracji; badania laboratoryjne

EN

hyporheic zone; hydraulic conductivity; laboratory research

• Wydawca: Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
• Czasopismo: Przegląd Geologiczny
• Rocznik: 2017
• Tom: Vol. 65, nr 11/1
• Strony: 1115--1120
• Opis fizyczny: Bibliogr. 27 poz., rys., tab., wykr.

Twórcy

autor

Marciniak M.

• Wydział Nauk Geograficznych i Geologicznych, Uniwersytet im. Adama Mickiewicza w Poznaniu, ul. Krygowskiego 10, 61-680 Poznań

autor

Szczucińska A.

• Wydział Nauk Geograficznych i Geologicznych, Uniwersytet im. Adama Mickiewicza w Poznaniu, ul. Krygowskiego 10, 61-680 Poznań

autor

Kaczmarek M.

• Wydział Matematyki, Fizyki i Techniki, Uniwersytet Kazimierza Wielkiego w Bydgoszczy, ul. M.K. Ogińskiego 16, 85-092 Bydgoszcz

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Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).