scholarly journals Gamma ray transmission for hydraulic conductivity measurement of undisturbed soil columns

2007 ◽  
Vol 50 (2) ◽  
pp. 321-328 ◽  
Author(s):  
Anderson Camargo Moreira ◽  
Otávio Portezan Filho ◽  
Fábio Henrique Moraes Cavalcante ◽  
Melayne Martins Coimbra ◽  
Carlos Roberto Appoloni
Keyword(s):  
Hydraulic Conductivity ◽  
Gamma Ray ◽  
Conductivity Measurement ◽  
Nondestructive Method ◽  
Soil Density ◽  
Soil Columns ◽  
Undisturbed Soil ◽  
Transmission Technique ◽  
Homogeneous Soil

This work had the objective to determine the Hydraulic Conductivity K(theta) function for different depth levels z, of columns of undisturbed soil, using the gamma ray transmission technique applied to the Sisson method. The results indicated a growing behavior for K(theta) and a homogeneous soil density, both in relation to the increase of the depth. The methodology of gamma ray transmission showed satisfactory results on the determination of the hydraulic conductivity in columns of undisturbed soil, besides being very reliable and a nondestructive method.

scholarly journals Water Phase Inclination Theory for Hydraulic Conductivity Determination of Vadose Zones in Shallow Water Table Systems

2021 ◽  
Vol 54 (2B) ◽  
pp. 85-100
Author(s):  
Arkan Radi Ali
Keyword(s):  
Hydraulic Conductivity ◽  
Shallow Water ◽  
Linear Relationship ◽  
Water Table ◽  
Correlation Factor ◽  
Water Phase ◽  
Shallow Water Table ◽  
Allowable Limit ◽  
Undisturbed Soil

Water Phase Inclination is an innovative theory for hydraulic conductivity and determination of vadose zone overlying shallow water table systems. It was originated and analytically derived from Darcy's Law and based on some physio-mechanical properties of soil. Al-Musayab area of 176 Km2 at Mesopotamian region, mid-Iraq was undertaken as a case study. It consists of unconsolidated quaternary deposits and is usually finer-grained than the underlying pebbly sandstone with Mediterranean weather. The Experimental part was divided into field tests which include double ring infiltrometer tests, water table depth measurements and sampling of 32 undisturbed soil samples of surface layers scattered over the study area Whereas lab tests include; the falling and constant head permeability, grain size distribution (sieve and hydrometer analysis), soil specific gravity, direct shear tests and the measuring of Water Phase Inclinations. Angle \emptyset a glassy infiltration box is an experimental device that was manufactured to measure the Water Phase Inclination angle and aquifer simulation. It is found a generalized linear relationship between  and the angle of internal friction which is valid for   23.37 with correlation factor R² = 0.99 and both angles depend on soil texture. The k values estimated by WPI theory and that measured by traditional techniques offer a linear relationship with acceptable Root Mean Square Error equals 0.0642 < 0.1 the max allowable limit and correlation factor R² = 0.96, pointing out to the reliability and stability of the Water Phase Inclination results.

Hydraulic conductivity of undeformed soil columns by gamma ray transmission

2001 ◽  
Vol 61 (3-6) ◽  
pp. 693-695 ◽  
Author(s):  
A.C. Moreira ◽  
F.H. de M. Cavalcante ◽  
M.C. da Rocha ◽  
O. Portezan ◽  
M.M. Coimbra ◽  
...  
Keyword(s):  
Hydraulic Conductivity ◽  
Gamma Ray ◽  
Soil Columns

Determination of Hydrogen in Semiconductors and Related Materials by Cold Neutron Capture Prompt Gamma-Ray Activation Analysis

1993 ◽  
Vol 324 ◽  
Author(s):  
Rick L. Paul ◽  
Richard M. Lindstrom
Keyword(s):  
Activation Analysis ◽  
Neutron Capture ◽  
Gamma Ray ◽  
Cold Neutron ◽  
Dielectric Film ◽  
Nondestructive Method ◽  
Chemical Form ◽  
Prompt Gamma ◽  
Γ Ray

AbstractA reliable nondestructive method for measuring trace amounts of hydrogen in semiconductors and related materials has long been needed. Cold neutron capture prompt γ-ray activation analysis (CNPGAA) is a nondestructive, multielement technique which has found application in the measurement of trace amounts of hydrogen. The sample is irradiated by a beam of “cold” neutrons; the presence of hydrogen is confirmed by the detection of a 2223 keV gamma-ray. The technique gives bulk analyses (the neutron and gamma radiation penetrate the sample), the hydrogen peak is free of interferences, and the results are independent of the chemical form of hydrogen present. The instrument is capable of detecting less than 10 mg/kg of hydrogen in many matrices. We have used the technique to measure hydrogen levels in a dielectric film on a silicon wafer, semiconductor grade germanium, and quartz.

Effects of soil structural properties on saturated hydraulic conductivity under different land-use types

Soil Research ◽  
2014 ◽  
Vol 52 (4) ◽  
pp. 340 ◽  
Author(s):  
Yanli Jiang ◽  
Ming'an Shao
Keyword(s):  
Land Use ◽  
Hydraulic Conductivity ◽  
Water Supply ◽  
Organic Matter Content ◽  
Aggregate Stability ◽  
Saturated Hydraulic Conductivity ◽  
Soil Columns ◽  
Undisturbed Soil ◽  
Land Use Types ◽  
The Impact

Soil structure has important influences on edaphic conditions and environment, is often related to aggregate stability. The saturated hydraulic conductivity (Ks) is an important soil hydraulic property that affects water flow and transport of dissolved solutes. The objective of this study was to analyse the impact of water-stable aggregate stability on Ks under different land-use types. Using a range of aggregate stabilities in disturbed soil columns, Ks was measured and relationships between the mean weight diameter (MWD) of aggregates and Ks for three different conditions (three soil layers, four land use types, two water supply methods) were determined. Differences between soil aggregate characteristics and organic matter content among the land use types were significant. Using both both top and bottom water supply methods, MWD was related to Ks by a non-linear function (coefficient of determination >0.95), and land-use type and water supply method were significant factors. When undisturbed soil columns were investigated, the relationship between MWD and Ks was obscured by other soil environmental factors.

AN IMPROVED METHOD TO STUDY SOLUTE LEACHING IN LARGE UNDISTURBED SOIL COLUMNS NEAR FIELD CAPACITY TOWARD THE GROUNDWATER IN VARIOUS ENVIRONMENTS

2020 ◽  
Vol 15 (1) ◽  
pp. 93-102
Author(s):  
Cristian PĂLTINEANU ◽  
◽  
Andrei VRINCEANU ◽  
Anca-Rovena LĂCĂTUȘU ◽  
Radu LĂCĂTUŞU ◽  
...  
Keyword(s):  
Near Field ◽  
Field Capacity ◽  
Improved Method ◽  
Soil Columns ◽  
Undisturbed Soil ◽  
Solute Leaching
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