Benoit, Gaboury

Weissberg, Leana M

English

Yale University

Yale UniversityEliScholar – A Digital Platform for Scholarly Publishing at YaleYale Day of Data Day of Data 2016Closing the Water Budget in an ExperimentalUrban Watershed: A Comparative Assessment ofMethods for Measuring EvapotranspirationLeana M. WeissbergYale University, leana.weissberg@yale.eduGaboury BenoitYale University, gabouryb@gmail.comFollow this and additional works at: http://elischolar.library.yale.edu/dayofdataPart of the Environmental Monitoring Commons, Hydrology Commons, Other Earth SciencesCommons, and the Soil Science CommonsThis Event is brought to you for free and open access by EliScholar – A Digital Platform for Scholarly Publishing at Yale. It has been accepted forinclusion in Yale Day of Data by an authorized administrator of EliScholar – A Digital Platform for Scholarly Publishing at Yale. For more information,please contact elischolar@yale.edu.Weissberg, Leana M. and Benoit, Gaboury, "Closing the Water Budget in an Experimental Urban Watershed: A ComparativeAssessment of Methods for Measuring Evapotranspiration" (2017). Yale Day of Data. 9.http://elischolar.library.yale.edu/dayofdata/2016/posters/9Closing the Water Budget in an Experimental Urban Watershed: A Comparative Assessment of Methods for Measuring Evapotranspiration   Keywords: evapotranspiration, urban watersheds, hydrological monitoring, eco-hydrology   The Yale Experimental Watershed (YEW) has an area of 7.8 ha and is located on the Yale campus in New Haven. A seasonal stream drains the watershed. Woodland occupies the central portion of the property, surrounded by homes, streets, and university buildings. The site has been used for research and teaching for the past 5 years, and extensive baseline data have been collected.  My research at the YEW compares methods for measuring evapotranspiration (ET) in urban environments. Three independent measurements of ET (mm/day) will be produced for the 2016-growing season using the following methods:  a. Micrometeorological: Shuttleworth-Wallace heat budget b. Hydrological: Soil moisture profiles  c. Physical: Pan evaporation  These techniques sense various environmental data. The aim of the project is to determine how the signals differ from one another. Furthermore, the research seeks to recommend a method for the measurement of ET in cities.  Data collection is continuous for all methods, occurring at scales as fine as 5-minute intervals (generating 100,000 data points/year) and as coarse as 1-hour. This volume of data requires careful organization and interpretation. Furthermore, site-specific configurations of research equipment have required somewhat novel interpretations of data to estimate ET.  Historical data is also being utilized to produce a water budget for the site. These include stream flow, groundwater level, and precipitation data. The water budget should illuminate physical characteristics of the groundwater watershed, which has received little attention at the site, and also allow for an estimation of ET by difference (ET = Precipitation – Outflow – Storage).      

Closing the Water Budget in an Experimental Urban Watershed: A Comparative Assessment of Methods for Measuring Evapotranspiration

https://elischolar.library.yale.edu/cgi/viewcontent.cgi?article=1084&amp;context=dayofdata

Closing the Water Budget in an Experimental Urban Watershed: A Comparative Assessment of Methods for Measuring Evapotranspiration

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