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

Ledesma, José L. J.; Ruiz-Pérez, Guiomar; Lupon, Anna; Poblador, Sílvia; Futter, Martyn N.; Sabater, Francesc; Bernal, Susana

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. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000130310
Veröffentlicht am 10.03.2021
Originalveröffentlichung
DOI: 10.1016/j.jhydrol.2021.126014
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Geographie und Geoökologie (IFGG)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 0022-1694, 1879-2707
KITopen-ID: 1000130310
Erschienen in Journal of Hydrology
Verlag Elsevier
Band 595
Seiten Art.-Nr.: 126014
Schlagwörter Terrestrial–aquatic interface; Hydrological connectivity; Hydrological modelling; Catchment biogeochemistry; Mediterranean climate; Environmental change
Nachgewiesen in Scopus
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