Simulating Fully‐Integrated Hydrological Dynamics in Complex Alpine Headwaters: Potential and Challenges

Détails

Ressource 1Télécharger: Water Resources Research - 2022 - Thornton - Simulating Fully‐Integrated Hydrological Dynamics in Complex Alpine Headwaters.pdf (8822.70 [Ko])
Etat: Public
Version: Final published version
Licence: CC BY 4.0
ID Serval
serval:BIB_8117907E019A
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Simulating Fully‐Integrated Hydrological Dynamics in Complex Alpine Headwaters: Potential and Challenges
Périodique
Water Resources Research
Auteur⸱e⸱s
Thornton J. M., Therrien R., Mariéthoz G., Linde N., Brunner P.
ISSN
0043-1397
1944-7973
Statut éditorial
Publié
Date de publication
04/2022
Peer-reviewed
Oui
Volume
58
Numéro
4
Langue
anglais
Résumé
Highly simplified approaches continue to underpin hydrological climate change impact assessments across the Earth's mountainous regions. Fully-integrated surface-subsurface models may hold far greater potential to represent the distinctive regimes of steep, geologically-complex headwater catchments. However, their utility has not yet been tested across a wide range of mountainous settings. Here, an integrated model of two adjacent calcareous Alpine headwaters that accounts for two-dimensional surface flow, three-dimensional (3D) variably-saturated groundwater flow, and evapotranspiration is presented. An energy balance-based representation of snow dynamics contributed to the model's high-resolution forcing data, and a sophisticated 3D geological model helped to define and parameterize its subsurface structure. In the first known attempt to calibrate a catchment-scale integrated model of a mountainous region automatically, numerous uncertain model parameters were estimated. The salient features of the hydrological regime could ultimately be satisfactorily reproduced – over an 11-month evaluation period, the Nash-Sutcliffe efficiency of simulated streamflow at the main gauging station was 0.76. Spatio-temporal visualization of the forcing data and simulated responses further confirmed the model's broad coherence. Presumably due to unresolved local subsurface heterogeneity, closely replicating the somewhat contrasting groundwater level signals observed near to one another proved more elusive. Finally, we assessed the impacts of various simplifications and assumptions that are commonly employed in physically-based modeling – including the use of spatially uniform forcings, a vertically limited model domain, and global geological data products – on key simulated outputs, finding strongly affected model performance in many cases. Although certain outstanding challenges must be overcome if the uptake of integrated models in mountain regions around the world is to increase, our work demonstrates the feasibility and benefits of their application in such complex systems.
Mots-clé
Water Science and Technology
Web of science
Création de la notice
16/05/2022 11:29
Dernière modification de la notice
13/08/2022 6:37
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