نتایج جستجو برای: pedotransfer function

تعداد نتایج: 1213152  

Journal: :Computer and Information Science 2011
Ali Keshavarzi Fereydoon Sarmadian Reza Labbafi Abbas Ahmadi

Study of soil properties like field capacity (F.C) and permanent wilting point (P.W.P) plays important roles in study of soil moisture retention curve. Pedotransfer functions (PTFs) provide an alternative by estimating soil parameters from more readily available soil data. In this study, a new approach is proposed as a modification to a standard fuzzy modeling method based on the table look-up ...

Journal: :CoRR 2016
Behzad Ghanbarian Vahid Taslimitehrani Yakov A. Pachepsky

Saturated hydraulic conductivity Ksat is a fundamental characteristic in modeling flow and contaminant transport in soils and sediments. Therefore, many models have been developed to estimate Ksat from easily measureable parameters, such as textural properties, bulk density, etc. However, Ksat is not only affected by textural and structural characteristics, but also by sample dimensions e.g., i...

Journal: :desert 2011
a keshavarzi f sarmadian

investigation of soil properties like cation exchange capacity (cec) plays important roles in study of environmental reaserches as the spatial and temporal variability of this property have been led to development of indirect methods in estimation of this soil characteristic. pedotransfer functions (ptfs) provide an alternative by estimating soil parameters from more readily available soil data...

Journal: :Vadose Zone Journal 2022

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...

Journal: :Remote Sensing 2023

The soil sorption coefficient (Kd) of glyphosate mainly controls its transport and fate in the environment. Laboratory-based analysis Kd is laborious expensive. This study aimed to test feasibility visible near-infrared spectroscopy (vis–NIRS) as an alternative method for estimation at a country scale compare accuracy against pedotransfer function (PTF). A total 439 soils with wide range values...

ژورنال: علوم آب و خاک 2005
جهانگرد محمدی, , سید محمود طاهری, ,

Pedotransfer functions are the predictive models of a certain soil property from other easily, routinely, or cheaply measured properties. The common approach for fitting the pedotransfer functions is the use of the conventional statistical regression method. Such an approach is heavily based on the crisp obervations and also the crisp relations among variables. In the modeling natural systems, ...

ژورنال: علوم آب و خاک 2009
بیگی هرچگانی, حبیب اله , صالحی, محمدحسن , مهاجر, رضا,

Soil fertility measures such as cation exchange capacity (CEC) may be used in upgrading soil maps and improving their quality. Direct measurement of CEC is costly and laborious. Indirect estimation of CEC via pedotransfer functions, therefore, may be appropriate and effective. Several delineations of two consociation map units consisting of two soil families, Shahrak series and Chaharmahal seri...

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