The water retention curve (WRC) of arable soils from the southeastern United States at different levels compaction (no compaction, and 10 20% increases in soil bulk density) was estimated using van Genuchten–Mualem (VG) model. VG parameters noncompacted were obtained first by fitting measured hydraulic data. To construct WRC compacted soils, gravimetric values permanent wilting point (?gw, 1,50...

Arsenic is a metalloid frequently found in contaminated sites, especially the soil. In this regard, soil contamination has attracted researchers’ attention because it affects suction, which essential unsaturated mechanics. Due to its reliability and low cost, filter paper method used evaluate suction. However, laborious time consuming. As an alternative, different mathematical models have been ...

Current databases of soil hydraulic properties (SHPs) have typically been used to develop pedotransfer functions (PTFs) estimate water retention [?(h)] assuming a unimodal pore-size distribution. However, natural soils often show the presence bimodal multimodal distributions. Here, we three widely spread for PTF development: UNsaturated SOil DAtabase (UNSODA) 2.0, Vereecken, and European hydrop...

We present a synthetic hydraulic analysis of the propagation oscillatory perturbations in two-dimensional saturated zone bounded above by capillary fringe. Unsaturated flows are simulated physical model using hysteretic form Richards' equation parameterized van Genuchten water retention curve and Mualem conductivity for sand, loam, intermediate soil. Soil type affects periodic responses as func...

Modeling of the land surface water-, energy-, and carbon balance provides insight into behavior Earth System, under current future conditions. Currently, there exists a substantial variability between model outputs, for range types, whereby differences input parameters could be an important reason. For large-scale surface, hydrological, crop models, soil hydraulic properties (SHP) are required ...

[1] In this study, we present an efficient approach, called the probabilistic collocation method (PCM), for uncertainty analysis of flow in unsaturated zones, in which the constitutive relationship between the pressure head and the unsaturated conductivity is assumed to follow the van Genuchten-Mualem model. Spatial variability of soil parameters leads to uncertainty in predicting flow behavior...

The choice for specific parameter estimation methods is often more dependent on its availability than its performance. We developed SPOTPY (Statistical Parameter Optimization Tool), an open source python package containing a comprehensive set of methods typically used to calibrate, analyze and optimize parameters for a wide range of ecological models. SPOTPY currently contains eight widely used...

Abstract. Soil hydraulic and hydrodispersive properties are necessary for modeling water solute fluxes in agricultural environmental systems. Despite the major efforts developing methods (e.g., laboratory-based, pedotransfer functions), their characterization at applicative scales remains an imperative requirement. Accordingly, this paper proposes a noninvasive situ method integrating electroma...

Abstract. Soil hydraulic properties are often derived indirectly, i.e. computed from easily available soil with pedotransfer functions (PTFs), when those needed for catchment, regional or continental scale applications. When predicted parameters used the modelling of state and flux water in soils, uncertainty values can provide more detailed information drawing conclusions. The aim this study w...