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QUANTIFYING THE EFFECT OF WEATHER PARAMETERS ON EVAPOTRANSPIRATION USING GEOTEXTILE LYSIMETERS
Abstract
This study investigates the influence of meteorological variables on evapotranspiration (ET) using a novel lysimeter design. ET was measured with three specially constructed lysimeters made from water containers equipped with geotextile bags filled with sand and colonized by grass cover (Red fescue and Perennial ryegrass). The use of geotextile lysimeters provides a simple and robust tool for ET quantification under outdoor conditions and also reflects the structural principle of evaporation beds (ET-beds), used for wastewater disposal by ET with sidewalls built from geotextile bags. The lysimeters were installed at a meteorological station and continuously saturated with water supplied by dosing pumps. Refilling was monitored through water meters, with readings corrected for precipitation recorded at the station. ET was then calculated from evaporated water volume. The measured ET values were analyzed against meteorological data using multicriterial regression models, achieving high explanatory power (R2 = 0,95, F-test = 300). The findings show that ET can be reliably predicted from key meteorological parameters and confirm the suitability of geotextile-based systems for ET research. Importantly, the results provide insights for the development and optimization of wastewater disposal systems based on ET-beds. by identifying how exposure to meteorological conditions maximizes ET, this research supports the design of effluent-free wastewater disposal alternatives to cesspools.
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