Abstract
Ljubljana field aquifer is an important source of drinking water for the Ljubljana city and surrounding areas. Knowledge of the water balance and of the water flow dynamics through the unsaturated zone and recharge of Ljubljana field aquifer is crucial. The water balance assessment of the upper unsaturated zone provides an insight into groundwater recharge and renewal. With the help of build-in monolith weighing lysimeter in Kleče in Ljubljana we have assessed the water balance for hydrological year from March 2014 to February 2015. Water balance parameters, precipitation and evapotranspiration were determined from the changes in the mass of lysimeter and outflow tank. Precipitation events were evaluated based on their duration, intensity and the amount of precipitation. Evapotranspiration and the duration of precipitation were estimated based on the changes of the lysimeter mass. Results show that the chosen period was extremely wet. In the selected hydrological year, precipitation contributed to positive water balance of the upper unsaturated zone, as well as to the recharge of the aquifer.
Highlights
Izvleček: Ljubljansko polje je pomemben vodonosnik, ki je vir pitne vode za širšo okolico Ljubljane, zato je poznavanje vodne bilance zelo pomembno
Calculation of water balance of the weighing lysimeter for assessment of aquifer recharge Abstract: Ljubljana field aquifer is an important source of drinking water for the Ljubljana city and surrounding areas
Precipitation and evapotranspiration were determined from the changes in the mass of lysimeter and outflow tank
Summary
Lizimeterska postaja v Klečah (Slika 1 in 2) je bila zgrajena v osemdesetih letih prejšnjega stoletja z namenom ocenjevanje vodne bilance lizimetra (Brilly in Gorišek, 1985). Slednja je bila izračunana kot razlika spremembe mase lizimetra in iztoka v dveh časovnih korakih:. Spremembo mase lizimetra W smo izračunali kot razliko med začetno vrednostjo, preden ta začne strmo upadati, in končno vrednostjo, ko se proces evapotranspiracije prekine. Količino iztoka O smo izračunali kot razliko med končno in začetno vrednostjo časovnega koraka. Količino iztoka v enem dnevu (od 0:00 do 24:00) smo izračunali po naslednji enačbi:. S pomočjo meritev mase lizimetra smo določili tudi količino padavin (Plys). Padavinski dogodek smo določili iz grafa mase lizimetra W v odvisnosti od časa ter nato izračunali iz spremembe mase lizimetra ∆W med zadnjo vrednostjo W, preden se je začela dvigati in najvišjo vrednostjo W, preden je ta začela upadati (posledica ET ali O). Prav tako smo izračunali mesečno vodno bilanco za eno hidrološko leto (obdobje marec 2014 – februar 2015)
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