Naslov
Estimation of recharge from karst soil by reservoir cascade scheme model

Autori
Švob, Mirna ; Domínguez-Villar, David ; Krklec, Kristina

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Proceedings of INQUA SEQS 2021 Conference / Ratajczak-Skrzatek, Urszula ; Kovalchuk, Oleksandr ; Stefaniak, Krzysztof - Wrocław : University of Wrocław & Polish Geological Society, 2021, 110-110

Skup
INQUA SEQS 2021 "Quaternary Stratigraphy - palaeoenvironment and humans in Eurasia"

Mjesto i datum
Wrocław, Poljska, 13.12.2021. - 13.12.2021

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
reservoir cascade scheme ; recharge ; preferential flows ; karst soil
(reservoir cascade scheme ; recharge ; preferential flows ; karst soi)

Sažetak
Recharge from soil to karst was estimated in a 0.6 m deep soil profile developed on dolomite marbles with a small cave system, at a location in central Spain [1]. Soil water content (SWC) was simulated for six layers in soil by reservoir cascade scheme (RCS) approach. In RCS approach, soil is considered as a unit made of imaginary layers, i.e., reservoirs. Each reservoir gains and loses water by major hydrological processes which include precipitation, runoff, plant interception, evaporation, transpiration, infiltration, redistribution, and drainage or deep percolation [2, 3]. Soil field capacity (FC) is considered a key parameter in RCS approach since it represents a threshold that controls process of drainage in a way that whenever SWC exceeds FC of a certain layer, drainage occurs [4]. Besides when FC of soil is exceeded, drainage as well occurs in the form of preferential flows. Drainage from the deepest soil layer enters as recharge from soil to the vadose zone of karst. Therefore, three different configurations of the model are assumed. Configuration 1 considers only basic RCS module, while configurations 2 and 3 include preferential flows. Configuration 2 considers RCS module together with a continuous preferential flow module, where 1 to 5% of available SWC from each layer is drained every day along preferential pathways, while Configuration 3 contains discontinuous preferential flow module in addition to all previous modules. The discontinuous preferential flow is only activated during rainfall events occurring after long dry periods. Therefore, model provides three different estimations of recharge. The simulation shows that preferential flows significantly impact the amount of soil-karst recharge. When only RCS module is considered (Configuration 1), recharge occurs only during winter-spring period, while during summer months, no recharge occurs. When preferential flows are considered, recharge occurs during summer months as well. Furthermore, cave hydrology depends on recharge amount from the surface, impacting speleothems formation. Therefore in order to accurately interpret paleoclimate proxies from speleothems it is important to understand water dynamics in soil and at soil-rock interface.

Izvorni jezik
Engleski

Znanstvena područja
Geologija, Poljoprivreda (agronomija)

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