Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Automated Chamber System to Measure Field Evapotranspiration Rates
Reliable estimation of evapotranspiration is important for many hydrological applications, including agriculture, climatology, and assessment of stormwater control measures. An automated chamber system was constructed to measure field evapotranspiration. The system consists of six chambers, sampled consecutively by means of a dynamic closed-chamber design, and is fully automated to allow replicable long-term measurements. However, the use of such a system is subject to measurement errors due to vapor adsorption along the sampling tubes and inappropriate internal ventilation. Because these issues are rarely addressed in the literature on flux chambers, a laboratory calibration was performed to estimate errors in evapotranspiration rates measured by the system. The effects of the sampling tube length and air mixing were investigated. A correction factor for evapotranspiration rates relative to the tube length was established. Appropriate air mixing induced by small fans ensured that the measured rates were representative of the internal conditions of the chambers. With appropriate internal ventilation and correction factors, the relative error of measurements was less than 5% for high evapotranspiration rates.
Automated Chamber System to Measure Field Evapotranspiration Rates
Reliable estimation of evapotranspiration is important for many hydrological applications, including agriculture, climatology, and assessment of stormwater control measures. An automated chamber system was constructed to measure field evapotranspiration. The system consists of six chambers, sampled consecutively by means of a dynamic closed-chamber design, and is fully automated to allow replicable long-term measurements. However, the use of such a system is subject to measurement errors due to vapor adsorption along the sampling tubes and inappropriate internal ventilation. Because these issues are rarely addressed in the literature on flux chambers, a laboratory calibration was performed to estimate errors in evapotranspiration rates measured by the system. The effects of the sampling tube length and air mixing were investigated. A correction factor for evapotranspiration rates relative to the tube length was established. Appropriate air mixing induced by small fans ensured that the measured rates were representative of the internal conditions of the chambers. With appropriate internal ventilation and correction factors, the relative error of measurements was less than 5% for high evapotranspiration rates.
Automated Chamber System to Measure Field Evapotranspiration Rates
Hamel, Perrine (Autor:in) / Mchugh, Ian (Autor:in) / Coutts, Andrew (Autor:in) / Daly, Edoardo (Autor:in) / Beringer, Jason (Autor:in) / Fletcher, Tim D. (Autor:in)
03.04.2014
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
Automated Chamber System to Measure Field Evapotranspiration Rates
| British Library Online Contents | 2015
Automated Chamber System to Measure Field Evapotranspiration Rates
| Online Contents | 2015
Evapotranspiration rates in urban areas
| British Library Conference Proceedings | 1999
Development of a Stormwater Control Measure Microcosm to Measure Evapotranspiration
| British Library Conference Proceedings | 2011
Evapotranspiration from a Green-Roof Storm-Water Control Measure
| British Library Online Contents | 2013