Details zur Publikation |
| Kategorie | Textpublikation |
| Referenztyp | Zeitschriften |
| DOI | 10.1016/j.jhydrol.2024.132238 |
Lizenz  |
|
| Titel (primär) | Can the young water fraction reduce predictive uncertainty in water transit time estimations? |
| Autor | Borriero, A.; Nguyen, V.T.
; Lutz, S.R.; Fleckenstein, J.H.; Musolff, A.; Kumar, R.
|
| Quelle | Journal of Hydrology |
| Erscheinungsjahr | 2024 |
| Department | CHS; HDG |
| Band/Volume | 645, Part B |
| Seite von | art. 132238 |
| Sprache | englisch |
| Topic | T5 Future Landscapes |
| Supplements | https://ars.els-cdn.com/content/image/1-s2.0-S0022169424016342-mmc1.pdf |
| Keywords | Young water fraction; Transit time distribution; SAS functions; Uncertainty |
| Abstract |
Transit
time distributions (TTDs) of streamflow are informative descriptors of
catchment hydrological functioning and solute transport mechanisms.
Conventional methods for estimating TTDs generally require model calibration
against extensive tracer data time series, which are often limited to
well-studied experimental catchments. We challenge this limitation and propose
an alternative approach that uses the young water fraction (Fywobs),
an increasingly used water age metric which represents the proportion of
streamflow with a transit time younger than 2-3 months, and that can be
robustly estimated with sparsely measured tracer data. To this end, we
conducted a proof of concept study by modelling TTDs using StorAge Selection
(SAS) functions with oxygen isotopes (O) measurements for 23 diverse catchments
in Germany. In a Monte-Carlo approach, we computed the (averaged) marginal TTDs
of a prior parameter distribution and derived a model-based Fyw (Fywsim).
We compared Fywsim with Fywobs,
obtained from O measurements, and constrained the prior SAS parameters
distribution. Subsequently, we derived a posterior distribution of parameters
and resulting model simulations. Our findings showed that using Fywobs
to constrain the model effectively reduced parameter equifinality and
simulation uncertainty. However, the value of Fywobs on
reducing model uncertainty varied across sites, with larger values (Fywobs0.10)
leading to simulations with a narrower uncertainty band and higher model
efficiency, whilst smaller values (Fywobs0.05) had
limited influence on reducing model output uncertainty. We discussed the
potential and limitations of combining SAS functions with Fywobs,
and considered broader implications of this approach for enhancing our
understanding of catchment functioning and water quality status. |
| dauerhafte UFZ-Verlinkung | https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=29862 |
| Borriero, A., Nguyen, V.T., Lutz, S.R., Fleckenstein, J.H., Musolff, A., Kumar, R. (2024): Can the young water fraction reduce predictive uncertainty in water transit time estimations? J. Hydrol. 645, Part B , art. 132238 10.1016/j.jhydrol.2024.132238 |
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