Spatial patterns of Transit-Time Distributions using 18O-isotope tracer simulations at ungauged river locations

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Main Title: Spatial patterns of Transit-Time Distributions using 18O-isotope tracer simulations at ungauged river locations

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Abstract: Knowledge of catchment response times to a precipitation forcing and of transit times of water parcels through the soil to the outlet can be used to characterize a catchments hydrological behavior. The aim of this study was to use one gauging station together with multiple isotope (18O) monitoring stream locations to characterize the spatial heterogeneity of a catchment’s hydrological behavior in the context of response and transit times. We present a method suitable for small catchments to estimate the Transit-Time Distribution (TTD) of precipitation to any stream point using 18O tracer data, no matter if it is gauged or ungauged. We used hourly runoff and precipitation data to determine the effective precipitation under base flow conditions at Wüstebach (Eifel, Germany), a small, forested TERENO/TR32 test site. Modeling of base flow was possible due to the weekly measurement intervals of 18O. The modeling period of 2.5 years was split up in six different hydrological seasons, based on average soil water content, in order to ensure a good fit of the model. Due to the small size of the Wüstebach catchment (27 ha), we assumed the derived effective precipitation applicable for the whole catchment. For subsequent modeling of stream water 18O data we used effective precipitation as an input variable and corrected obtained simulation results in a two-step process to account for canopy evaporation and soil evaporation. Thus we derived 16 base flow TTDs for the ungauged stream locations and tributary locations. Results show a different behavior of the catchments response time for different catchment wetness conditions with respect to base flow formation. Winter seasons show similar response times, as well as summer seasons, with the exception of one summer with a considerable higher response time. The transit time of water across the 16 isotope observation points shows points more influenced by shallow source waters than other points, where a heavier contribution of groundwater is observable.

Responsible Party

*Creator:*	Michael Stockinger (Author)
*Publisher:*	CRC/TR32 Database (TR32DB)
*Publication Year:*	2013

Topic

*TR32 Topic:*	Other
*Related Subproject:*	C1
*Subject:*	Keyword: PhD Report

File Details

*Filename:*	Report3_Stockinger_2012.pdf
*Data Type:*	Text - Text
*File Size:*	1.5 MB
*Date:*	Available: 30.11.2012
*Mime Type:*	application/pdf
*Data Format:*	PDF
*Language:*	English
*Status:*	Completed

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*Download Permission:*	Only Project Members
*General Access and Use Conditions:*	According to the TR32DB data policy agreement.
*Access Limitations:*	According to the TR32DB data policy agreement.
*Licence:*	[TR32DB] Data policy agreement

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Specific Information - Report

*Report Date:*	30th of November, 2012
*Report Type:*	PhD Report
*Report City:*	Jülich, Germany
*Report Institution:*	Institute of Bio and Geosciences Agrosphere (IBG-3), Research Center Jülich
*Number of Pages:*	12 (1 - 12)
*Further Information:*	Tr32 Student Report Phase II

Metadata Details

*Metadata Creator:*	Michael Stockinger
*Metadata Created:*	04.12.2013
*Metadata Last Updated:*	04.12.2013
*Subproject:*	C1
*Funding Phase:*	2
*Metadata Language:*	English
*Metadata Version:*	V50

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