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Future changes in the Dominant Source Layer of riparian lateral water fluxes in a subhumid Mediterranean catchment

Ledesma, Jose and Ruiz-Pérez, Guiomar and Lupon, Anna and Poblador, Silvia and Futter, Martyn and Sabater, Francesc and Bernal, Susana (2021). Future changes in the Dominant Source Layer of riparian lateral water fluxes in a subhumid Mediterranean catchment. Journal of Hydrology. 595 , 126014
[Research article]

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Abstract

The 'Dominant Source Layer' (DSL) is defined as the riparian zone (RZ) depth stratum that contributes the most to water and solute fluxes to streams. The concept can be used to explain timing and amount of matter transferred from RZs to streams in forest headwaters. Here, we investigated the potential impact of future climate changes on the long-term position of the DSL in a subhumid Mediterranean headwater catchment. We used the rainfall-runoff model PERSiST to simulate reference (1981-2000) and future (2081-2100) stream runoff. The latter were simulated using synthetic temperature, precipitation, and inter-event length scenarios in order to simulate possible effects of changes in temperature, rainfall amount, and rainfall event frequency and intensity. Simulated stream runoff was then used to estimate RZ groundwater tables and the proportion of lateral water flux at every depth in the riparian profile; and hence the DSL. Our simulations indicated that future changes in temperature and precipitation will have a similar impact on the long-term DSL position. Nearly all scenarios projected that, together with reductions in stream runoff and water exports, the DSL will move down in the future, by as much as ca. 30 cm. Shallow organic-rich layers in the RZ will only be hydrologically activated during sporadic, large rainfall episodes predicted for the most extreme inter-event length scenarios. Consequently, terrestrial organic matter inputs to streams will decrease, likely reducing catchment organic matter exports and stream dissolved organic carbon concentrations. This study highlights the importance of identifying vertical, hydrologically active layers in the RZ for a better understanding of the potential impact of future climate on lateral water transfer and their relationship with surface water quality and carbon cycling.

Authors/Creators:Ledesma, Jose and Ruiz-Pérez, Guiomar and Lupon, Anna and Poblador, Silvia and Futter, Martyn and Sabater, Francesc and Bernal, Susana
Title:Future changes in the Dominant Source Layer of riparian lateral water fluxes in a subhumid Mediterranean catchment
Series Name/Journal:Journal of Hydrology
Year of publishing :2021
Volume:595
Article number:126014
Number of Pages:13
Publisher:ELSEVIER
ISSN:0022-1694
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution-Noncommercial-No Derivative Works 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Oceanography, Hydrology, Water Resources
Keywords:Terrestrial-aquatic interface, Hydrological connectivity, Hydrological modelling, Catchment biogeochemistry, Mediterranean climate, Environmental change
URN:NBN:urn:nbn:se:slu:epsilon-p-112076
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-112076
Additional ID:
Type of IDID
DOI10.1016/j.jhydrol.2021.126014
Web of Science (WoS)000641592600054
ID Code:24383
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Aquatic Sciences and Assessment
(NL, NJ) > Dept. of Crop Production Ecology
Deposited By: SLUpub Connector
Deposited On:03 Jun 2021 12:03
Metadata Last Modified:03 Jun 2021 12:11

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