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| Titel |
Modeling the distribution of water travel time through catchments using the tempered Levy (TOSS) density |
| VerfasserIn |
Sofie Safeyeh Soltani, Vladimir Cvetkovic |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250141174
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| Publikation (Nr.) |
 EGU/EGU2017-4650.pdf |
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| Zusammenfassung |
| Abstract
In this work we model the advective travel time distribution through a
catchment focusing on groundwater. Our hypothesis is that the tempered Levy
(or tempered one-sided stable) distribution (Cvetkovic et al., 2012) is suitable for
quantifying travel time distributions in catchments; the hypothesis builds on the
fact that the tempered Levy density generalizes most of the models that have been
used in the literature (from plug flow, exponential and Gamma distributions, to
ADE and anomalous models). The hypothesis is tested on thoroughly investigated
and simulated Forsmark catchment (Sweden). Our approach is Lagrangian where
we follow trajectories and compute first passage (arrival) times of passive tracer
particles injected at recharge zones and monitored at different discharge zones.
In this study we consider long-term, steady-state conditions. It is shown that
asymptotically, the late arrivals are well reproduced by an inverse-Gaussian (ADE)
model up to 10%, whereas early arrivals tend to be between the inverse-Gaussian
and Gamma distributions. Comparison between the Lagrangian and Eulerian
velocities indicates strong preferential flow in the catchment,where less than 5%
of the Eulerian velocities contribute to advective transport over the simulated 375
years. |
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