نتایج جستجو برای: saturated hydraulic conductivity

تعداد نتایج: 107910  

Infiltration is the process of water penetration from the ground surface into the soil and is an important process in the hydrological cycle by which surface runoff and groundwater recharge can be linked. Over the years, the importance of the infiltration process resulted in the development of several simplified analytical models for predicting infiltration. These infiltration models range from...

2014
Jakub Nieć Marcin Spychała

The aim of this paper was to verify the common methods of hydraulic conductivity estimation for soil assessment in respect to wastewater disposal. The studies were conducted on three types of sandy soils. Hydraulic conductivity was determined using a scale effect-free laboratory method, empirical equations and compared with measurements estimated from a laboratory infiltration column with ident...

2013
Xingyuan Chen Haruko Murakami Melanie S. Hahn Glenn E. Hammond Mark Rockhold John M. Zachara Yoram Rubin Mark L. Rockhold

"Three-dimensional Bayesian geostatistical aquifer characterization at the Hanford 300 Area using tracer test data" (2012). US Department of Energy Publications. Paper 309. [1] Tracer tests performed under natural or forced gradient flow conditions can provide useful information for characterizing subsurface properties, through monitoring, modeling, and interpretation of the tracer plume migrat...

ژورنال: علوم آب و خاک 2019

Simulation of water and salt transfer in soil is very effective in managing optimal water and fertilizer use in the field. In this study, the HYDRUS-1D model was used to simulate the transfer of water and bromide in a laboratory column of soil with clay loam texture. Soil hydraulic parameters (including air entry point) α, (saturated hydraulic conductivity) ks, (residual moisture content) θr (s...

2017
R Cockett L J Heagy E Haber

Fluid flow in the vadose zone is governed by Richards equation; it is parameterized by hydraulic conductivity, which is a nonlinear function of pressure head. Investigations in the vadose zone typically require characterizing distributed hydraulic properties. Saturation or pressure head data may include direct measurements made from boreholes. Increasingly, proxy measurements from hydrogeophysi...

2014
Mohammad Nakhaei Jiří Šimůnek

Knowledge of soil hydraulic and thermal properties is essential for studies involving the combined effects of soil temperature and water input on water flow and redistribution processes under field conditions. The objective of this study was to estimate the parameters characterizing these properties from a transient water flow and heat transport field experiment. Real-time sensors built by the ...

2016
Derek M. Heeren Daniel E. Storm D. M. Heeren G. A. Fox D. E. Storm

Hydrologic heterogeneities (e.g., macropores and gravel outcrops) in floodplains are hypothesized to play an integral role in impacting flow and leaching between the soil surface and shallow alluvial aquifers, which are intricately connected to streams. Infiltration is often assumed to be uniform, but this neglects the spatial variability common in anisotropic, heterogeneous alluvial floodplain...

ژورنال: علوم آب و خاک 2014
سرمست, معصومه , سر‌چشمه‌پور, مهدی , فرپور, محمد هادی , کریمیان اقبال, مصطفی ,

Biocalcite infilling and bridging in a sandy soil was studied in the present research. Effects of 2 bacterial species (Sporosarcina pasteurii and Sporosarcina ureae), 3 reactant concentrations (0.5, 1.0, and 1.5 M of urea and CaCl2 mixture), and 6 reaction times (12, 24, 48, 96, 192, and 288 hr) on saturated hydraulic conductivity and mechanical strength of a sandy soil were studied as a factor...

Journal: :Turkish Journal of Agriculture - Food Science and Technology 2020

ژورنال: علوم آب و خاک 2013
احمد جلالیان, , بهزاد قربانی, , مجید افیونی, , محسن حمیدپور, ,

Models are helpful tools to predict runoff, sediment and soil erosion in watershed conservation practices. The objectives of this research were to investigate sensitivity analysis, calibration and validation of EUROSEM model in estimation of runoff in Tangh-e-Ravagh sub-basin of Karoun watershed. The model was tested in a one hectare experimental test site. The area was divided into nine elemen...

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