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Browsing by Author Rahmati, M.

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  • On the impact of increasing drought on the relationship between soil water content and evapotranspiration of a grassland

    • Authors: Rahmati, M.;  Advisor: -;  Participants: Groh, J.; Graf, A.; Pütz, T.; Vanderborght, J.; Vereecken, H. (2020)

  • All components of the water balance were determined from 2012 until 2018. Budyko analysis was used to characterize the hydrological status of the studied sites. Wavelet analysis was also applied to study the power spectrum of ETa, vegetation‐height‐adjusted reference evapotranspiration (ETcrop), and water stress index (WSI) defined as ETa/ETcrop, as well as SWC at three different depths and the coherence between SWC and ETa and WSI. The Budyko analysis showed that 2018 resulted in a shift of both locations towards more water‐limited conditions, although Rollesbroich remained an energy‐limited system. Based on the power spectrum analysis, the annual timescale is the dominant scale for ...
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  • Soil hydraulic properties estimation from one‐dimensional infiltration experiments using characteristic time concept

    • Authors: Rahmati, M.;  Advisor: -;  Participants: Vanderborght, J.; Šimůnek, J.; Vrugt, J.A.; Moret‐Fernández, D.; Latorre, B.; Lassabatere, L.; Vereecken, H. (2020)

  • We demonstrate the usefulness and power of the CTM by comparing it with a suite of existing methods using synthetic cumulative infiltration data simulated by HYDRUS‐1D for 12 synthetic soils reflecting different USDA textural classes, as well as experimental data selected from the Soil Water Infiltration Global (SWIG) database. Results demonstrate that the inferred values of S and Ks are in excellent agreement with their theoretical values used in the synthetically simulated infiltration experiments with Nash–Sutcliffe criterion close to unity and RMSE values of 0.04 cm h−1/2 and 0.05 cm h−1, respectively. The CTM also showed very high accuracy when applied on synthetic data with adde...
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  • Water Retention and Pore Size Distribution of a Biopolymeric‐Amended Loam Soil

    • Authors: Rahmati, M.;  Advisor: -;  Participants: Pohlmeier, A.; Abasiyan, S.M.A.; Weihermüller, L.; Vereecken, H. (2019)

  • The results revealed that T2 spectra provided a good proxy to determine the PSD, showing good agreement between the PSD from T2 spectra and that calculated from the water retention curve (WRC) (R2 > 0.78; RMSE <1.38 μm). The application of CH also increased the zeta potential of the soil to −18.5 mV, compared with −20 mV obtained for the reference soil. The WRC measurements revealed that AG decreased the available water content for plant use compared with the reference soil, whereas CH increased the available water in comparison to the reference soil. Considering the parameters of the van Genuchten model, the application of AG and CH mainly affected the parameter α, confirming the dom...