Closed-form expressions of the hydraulic conductivity function for linearly superposed subretention (multimodal) functions were derived arbitrary sets Brooks and Corey (BC), van Genuchten (VG), Kosugi (KO) water retention models. The generalized Mualem model was evaluated using mathematical approach Priesack Durner. Three types modification to multimodel also proposed. Firstly, equations can be...

Abstract The presence of gravel in soils modifies the porosity, pore connectivity and size distribution soil matrix as well matrix-gravel interfaces. aim present study is to investigate effect relative volume samples with mass fractions 5,10, 20 wt% varying bulk densities (1.3, 1.45, 1.55, 1.60, 1.65 g cm –3 ) on (i) total field capacity, plant available water holding (ii) (iii) thermal capacit...

To explore the impact of artificial shelterbelt construction with saline irrigation on soil water characteristic curve (SWCC) shifting sandy in extreme arid desert areas, three treatments including under (US), bare land (BL) and (CK) hinterland Taklimakan Desert were selected. The age is 16, vegetation cover mainly Calligonum mongolicum. soils from different depths 0–30 cm taken keeping view ob...

Improving soil-water relations by amending soil with biochar might play a significant role in increasing water availability for agricultural crops as well decreasing loss through drainage or runoff. While the effects of on hydrological properties coarse-textured soils are generally positive and well-documented literature, studies fine-textured rather scarce even contradictory. Therefore, aim th...

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...

Pumping experiments were performed in a 2D tank order to estimate the recovery yield of pure heavy chlorinated organic compounds (DNAPL; dense non-aqueous phase liquids) by varying different parameters: permeability saturated zone, pumping flow rates, addition surfactant and heating. Surfactant was added decrease capillary forces involved entrapment DNAPL porous media while temperature increase...

Hydrological and climatic modeling of near-surface water energy fluxes is critically dependent on the availability soil hydraulic parameters. Key among these parameters characteristic curve (SWCC), a function relating content (θ) to matric potential (ψ). The direct measurement SWCC laborious, hence, reported values are spatially sparse usually have only small number data pairs (θ, ψ) per sample...

abstract various mathematical water uptake models have been introduced for plants response to combined drought and salinity stress. the reduction functions are classified as additive, multiplicative and conceptual models. in this study six different macroscopic reduction functions, namely; van genuchten (additive and multiplicative), dirksen et al., van dam et al, skaggs et al and homaee were e...

in this study, hydrus2d/3d software was used to estimate the hydraulic parameters of van genuchten-mualem model via inverse modeling using double-ring infiltrometers data in 3 different soil textures. nine scenarios of inverse modeling (divided in three groups) were considered with different number (5, 4 and 3) of fitted hydraulic parameters for optimization. in the first group, simulation was ...

Abstract. Soil water drainage is the main source of groundwater recharge and river flow. It therefore a key process for resource management. In this study, we evaluate soil hydrology drainage, simulated by interactions between soil–biosphere–atmosphere (ISBA) land surface model currently used hydrological applications from watershed scale to global scale, where parameters are generally not cali...