scholarly journals Profiles of volumetric water content in fault zones retrieved from hole B of the Taiwan Chelungpu-fault Drilling Project (TCDP)

2008 ◽  
Vol 35 (1) ◽  
Author(s):  
Weiren Lin ◽  
Osamu Matsubayashi ◽  
En-Chao Yeh ◽  
Tetsuro Hirono ◽  
Wataru Tanikawa ◽  
...  
Keyword(s):  
Water Content ◽  
Fault Zones ◽  
Volumetric Water Content ◽  
Chelungpu Fault ◽  
Drilling Project

scholarly journals Core Description and Characteristics of Fault Zones from Hole-A of the Taiwan Chelungpu-Fault Drilling Project

2007 ◽  
Vol 18 (2) ◽  
pp. 327 ◽  
Author(s):  
En-Chao Yeh ◽  
Hiroki Sone ◽  
Taichi Nakaya ◽  
Ka-Hao Ian ◽  
Sheng-Rong Song ◽  
...  
Keyword(s):  
Fault Zones ◽  
Chelungpu Fault ◽  
Core Description ◽  
Drilling Project

scholarly journals Characteristics of chlorites in seismogenic fault zones: the Taiwan Chelungpu Fault Drilling Project (TCDP) core sample

eEarth ◽  
2008 ◽  
Vol 3 (1) ◽  
pp. 1-6 ◽  
Author(s):  
Y. Hashimoto ◽  
O. Tadai ◽  
M. Tanimizu ◽  
W. Tanikawa ◽  
T. Hirono ◽  
...  
Keyword(s):  
Core Sample ◽  
Fault Zones ◽  
Seismogenic Fault ◽  
Chelungpu Fault ◽  
Drilling Project

scholarly journals Characteristics of chlorites in seismogenic fault zones: the Taiwan Chelungpu Fault Drilling Project (TCDP) core sample

2007 ◽  
Vol 2 (2) ◽  
pp. 85-98
Author(s):  
Y. Hashimoto ◽  
O. Tadai ◽  
M. Tanimizu ◽  
W. Tanikawa ◽  
T. Hirono ◽  
...  
Keyword(s):  
Core Sample ◽  
Fault Zones ◽  
Seismogenic Fault ◽  
Chelungpu Fault ◽  
Drilling Project

On the interpolation of volumetric water content in research catchments

2012 ◽  
Vol 50-52 ◽  
pp. 165-174 ◽  
Author(s):  
Phesheya Dlamini ◽  
Vincent Chaplot
Keyword(s):  
Water Content ◽  
Volumetric Water Content

Using time domain reflectometry in triaxial testing

2000 ◽  
Vol 37 (6) ◽  
pp. 1325-1331
Author(s):  
J LH Grozic ◽  
M E Lefebvre ◽  
P K Robertson ◽  
N R Morgenstern
Keyword(s):  
Cyclic Loading ◽  
Water Content ◽  
Time Domain ◽  
Void Ratio ◽  
Time Domain Reflectometry ◽  
Volumetric Water Content ◽  
Degree Of Saturation ◽  
Triaxial Testing ◽  
Empirical Correlations ◽  
Static And Cyclic Loading

Time domain reflectometry (TDR) can be used to determine the volumetric water content of soils. This note describes the utilization of a TDR miniprobe in triaxial testing. The TDR performance was examined with a series of tests that not only proved its reliability but also resulted in two empirical correlations. Using these correlations, the degree of saturation and volumetric water content during triaxial testing could be determined. The TDR was then put to use in a laboratory program designed to investigate the response of loose gassy sand under static and cyclic loading. Because of the TDR measurements it was possible to determine the degree of saturation and void ratio of the gassy specimens. The TDR miniprobe proved to be accurate, simple to use, and inexpensive to build.Key words: time domain reflectometry, TDR, triaxial testing, gassy, unsaturated.

Hyphal colonization of Rhizophagus irregularis increases unsaturated hydraulic conductivity of a loamy sand distant from roots

2021 ◽  
Author(s):  
Michael Bitterlich ◽  
Richard Pauwels
Keyword(s):  
Hydraulic Conductivity ◽  
Water Content ◽  
Hydraulic Properties ◽  
Volumetric Water Content ◽  
Rhizophagus Irregularis ◽  
Loamy Sand ◽  
Soil Hydraulic Properties ◽  
Unsaturated Hydraulic Conductivity ◽  
Soil Hydraulic ◽  
Root Exclusion

<p>Hydraulic properties of mycorrhizal soils have rarely been reported and difficulties in directly assigning potential effects to hyphae of arbuscular mycorrhizal fungi (AMF) arise from other consequences of AMF being present, i.e. their influence on growth and water consumption rates of their host plants that both also influence soil hydraulic properties.</p><p>We assumed that the typical nylon meshes used for root-exclusion experiments in mycorrhizal research can provide a dynamic hydraulic barrier. It is expected that the uniform pore size of the rigid meshes causes a sudden hydraulic decoupling of the enmeshed inner volume from the surrounding soil as soon as the mesh pores become air-filled. Growing plants below the soil moisture threshold for hydraulic decoupling would minimize plant-size effects on root-exclusion compartments and allow for a more direct assignment of hyphal presence to modulations in soil hydraulic properties.</p><p>We carried out water retention and hydraulic conductivity measurements with two tensiometers introduced in two different heights in a cylindrical compartment (250 cm³) containing a loamy sand, either with or without the introduction of a 20 µm nylon mesh equidistantly between the tensiometers. Introduction of a mesh reduced hydraulic conductivity across the soil volumes by two orders of magnitude from 471 to 6 µm d<sup>-1</sup> at 20% volumetric water content.</p><p>We grew maize plants inoculated or not with Rhizophagus irregularis in the same soil in pots that contained root-exclusion compartments while maintaining 20% volumetric water content. When hyphae were present in the compartments, water potential and unsaturated hydraulic conductivity increased for a given water content compared to compartments free of hyphae. These differences increased with progressive soil drying.</p><p>We conclude that water extractability from soils distant to roots can be facilitated under dry conditions when AMF hyphae are present.</p><p> </p>

scholarly journals Temperature estimates of coseismic heating in clay-rich fault gouges, the Chelungpu fault zones, Taiwan

2011 ◽  
Vol 502 (3-4) ◽  
pp. 315-327 ◽  
Author(s):  
Li-Wei Kuo ◽  
Sheng-Rong Song ◽  
Lin Huang ◽  
En-Chao Yeh ◽  
Huei-Fen Chen
Keyword(s):  
Fault Zones ◽  
Chelungpu Fault ◽  
Fault Gouges

scholarly journals Construction and calibration of TDR probes for volumetric water content estimation in a Distroferric Red Latosol

2013 ◽  
Vol 33 (5) ◽  
pp. 919-928 ◽  
Author(s):  
Rosimaldo Soncela ◽  
Silvio C. Sampaio ◽  
Marcio A. Vilas Boas ◽  
Maria H. F. Tavares ◽  
Adriana Smanhotto
Keyword(s):  
Water Content ◽  
Irrigation Management ◽  
Time Domain Reflectometry ◽  
Volumetric Water Content ◽  
Coefficient Of Determination ◽  
Calibration Model ◽  
Advantages And Disadvantages ◽  
Disturbed Soil ◽  
Red Latosol ◽  
The Time Domain

The determination of volumetric water content of soils is an important factor in irrigation management. Among the indirect methods for estimating, the time-domain reflectometry (TDR) technique has received a significant attention. Like any other technique, it has advantages and disadvantages, but its greatest disadvantage is the need of calibration and high cost of acquisition. The main goal of this study was to establish a calibration model for the TDR equipment, Trase System Model 6050X1, to estimate the volumetric water content in a Distroferric Red Latosol. The calibration was carried out in a laboratory with disturbed soil samples under study, packed in PVC columns of a volume of 0.0078m³. The TDR probes were handcrafted with three rods and 0.20m long. They were vertically installed in soil columns, with a total of five probes per column and sixteen columns. The weightings were carried out in a digital scale, while daily readings of dielectric constant were obtained in TDR equipment. The linear model θν = 0.0103 Ka + 0.1900 to estimate the studied volumetric water content showed an excellent coefficient of determination (0.93), enabling the use of probes in indirect estimation of soil moisture.

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