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@ARTICLE{Stockinger:154956,
author = {Stockinger, Michael and Bogena, Heye and Lücke, Andreas
and Diekkrüger, Bernd and Weiler, Markus and Vereecken,
Harry},
title = {{S}easonal soil moisture patterns: {C}ontrolling transit
time distributions in a forested headwater catchment},
journal = {Water resources research},
volume = {50},
number = {6},
issn = {0043-1397},
address = {Washington, DC},
publisher = {AGU},
reportid = {FZJ-2014-04165},
pages = {5270 - 5289},
year = {2014},
abstract = {The Transit Time Distribution (TTD) of a catchment is
frequently used for understanding flow paths, storage
characteristics, and runoff sources. Despite previous
studies, the connections between catchment characteristics
and TTDs are still not fully understood. We present results
from a 2 year stable isotope tracer investigation in the
forested Wüstebach headwater catchment (38.5 ha), including
precipitation, stream, and tributary locations. We used the
gauged outlet to determine effective precipitation (peff),
subdivided for wet and dry catchment state, and assumed it
to be spatially uniform. We then calculated TTDs of 14
ungauged stream and tributary locations where stable isotope
tracer information was available and compared them to
respective subcatchment areas and the proportion of riparian
zone within the subcatchments. Our approach gave insight
into the spatial heterogeneity of TTDs along the Wüstebach
River. We found that hydrological hillslope-riparian zone
disconnection was an important factor, as the catchment
shifted between two distinct, time-variant hydrological
responses that were governed by seasonal changes of overall
catchment wetness. The difference in hydrological behavior
of the riparian zone and hillslopes could explain the often
encountered “old water phenomenon,” where considerable
amounts of old water quickly appear as runoff. TTD results
showed a negative correlation between riparian zone
proportion and Mean Transit Time (MTT), corroborated by the
dense network of soil water content measurements. No
correlation between subcatchment size and MTT was found.},
cin = {IBG-3},
ddc = {550},
cid = {I:(DE-Juel1)IBG-3-20101118},
pnm = {246 - Modelling and Monitoring Terrestrial Systems: Methods
and Technologies (POF2-246) / 255 - Terrestrial Systems:
From Observation to Prediction (POF3-255)},
pid = {G:(DE-HGF)POF2-246 / G:(DE-HGF)POF3-255},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000340430400041},
doi = {10.1002/2013WR014815},
url = {https://juser.fz-juelich.de/record/154956},
}