Influence of seasonal variability of soil hydraulic properties in soil water content modelling

0500565 - ÚH 2019 RIV DE eng A - Abstrakt
Šípek, Václav - Tesař, Miroslav
Influence of seasonal variability of soil hydraulic properties in soil water content modelling.
17th Biennial Conference ERB2018: Book of Abstracts. Darmstadt: ERB, 2018.
[Biennial Conference ERB2018 /17./. 11.09.2018-14.09.2018, Darmstadt]
Grant CEP: GA ČR GA16-05665S
Institucionální podpora: RVO:67985874
Klíčová slova: soil moisture * seasonal variability * soil hydraulic parameters * saturated hydraulic conductivity * pore-size distribution * hydrological modelling
Obor OECD: Hydrology

Soil moisture plays a key role in the hydrological cycle as it controls the flux of water between soil, vegetation, and atmosphere. This study is focused on a year-round estimation of soil moisture in a forested mountain area using the bucket-model approach. For this purpose two soil moisture models are utilised. The procedure is based on splitting the whole year into several complement periods. Model parameters are allowed to vary between these periods and also from year to year in the calibration procedure. Consequently, average course of model parameters respecting their seasonal changes is proposed.
The process of splitting is strongly supported by the experimental data and it enables us to vary saturated hydraulic conductivity and pore-size characterisation. First, the use of the two different parameter sets (representing dormant and vegetation season) significantly enhances the simulation of two utilized models (Teuling and Troch model and Soil Water Balance Model-Green–Ampt (SWBM-GA)) in the sixyear period from 2009 to 2014. For these two models, the overall Nash-Sutcliffe coefficient increased from 0.64 to 0.79 and from 0.55 to 0.80, respectively. Further enhancement of the model efficiency was achieved by allowing the variances between particular vegetation seasons as the variability of the parameter sets between particular years was more pronounced in the vegetation seasons. The soil hydraulic parameters in the cold periods exhibited approximately similar values during all inspected years.
Trvalý link: http://hdl.handle.net/11104/0292656