Estimating high hydraulic conductivity locations through a 3D simulation of water flow in soil and a resistivity survey

2018 ◽  
Vol 49 (3) ◽  
pp. 299-308 ◽  
Author(s):  
Keisuke Inoue ◽  
Hiroomi Nakazato ◽  
Tomijiro Kubota ◽  
Koji Furue ◽  
Hiroshi Yoshisako ◽  
...  
Keyword(s):  
Hydraulic Conductivity ◽  
Water Flow ◽  
3D Simulation ◽  
Resistivity Survey ◽  
High Hydraulic Conductivity

Effect of a front high hydraulic conductivity zone on hydrological behavior of subsea tunnels

2010 ◽  
Vol 14 (5) ◽  
pp. 699-707 ◽  
Author(s):  
Eun-Soo Hong ◽  
Eui-Seob Park ◽  
Hee-Soon Shin ◽  
Hyung-Mok Kim
Keyword(s):  
Hydraulic Conductivity ◽  
High Hydraulic Conductivity

Characteristics of groundwater seepage with cut-off wall in gravel aquifer. I: Field observations

2015 ◽  
Vol 52 (10) ◽  
pp. 1526-1538 ◽  
Author(s):  
Yong-Xia Wu ◽  
Shui-Long Shen ◽  
Ye-Shuang Xu ◽  
Zhen-Yu Yin
Keyword(s):  
Hydraulic Conductivity ◽  
Clayey Soil ◽  
Retaining Wall ◽  
Ground Surface ◽  
Test Site ◽  
Second Phase ◽  
Confined Aquifer ◽  
Test Results ◽  
Sandy Gravel ◽  
High Hydraulic Conductivity

This paper presents a case history of the leakage behavior during dewatering tests in the gravel strata of an excavation pit of a metro station in Hangzhou, China. The groundwater system at the test site is composed of a phreatic aquifer underlain by an aquitard and a confined aquifer with coarse sand and gravel. The sandy gravel stratum has very high hydraulic conductivity. The maximum depth of the excavation is 24 m below the ground surface, which reaches the middle of the aquitard strata, where the thickness of the clayey soil is insufficient to maintain the safety of the base of the excavation. To understand the hydrological characteristics of gravel strata, single- and double-well pumping tests were conducted, where a cut-off wall was installed 43 m deep with its base penetrating 2 to 3 m into the aquifer. Test results show that this partial cut-off of the aquifer cannot effectively protect the base of the excavation from the upward seepage force of the groundwater during excavation. Therefore, a new cut-off wall (second phase) was constructed to a depth of 54 m to cut off the confined aquifer. A second pumping test was conducted after the construction of the second phase cut-off wall, and test results show that this full cut-off combined with dewatering can control groundwater effectively during excavation. This finding indicates that when a deep excavation is conducted in a confined aquifer with high hydraulic conductivity, determination of the depth of the retaining wall should be based on three factors: the stability of the base, the upward seepage stability, and settlement control.

Historical development of soil-water physics and solute transport in porous media

2007 ◽  
Vol 7 (1) ◽  
pp. 59-66 ◽  
Author(s):  
D.E. Rolston
Keyword(s):  
Porous Media ◽  
Hydraulic Conductivity ◽  
Solute Transport ◽  
Soil Water ◽  
20Th Century ◽  
Water Flow ◽  
Unsaturated Soils ◽  
Transport Processes ◽  
Transport In Porous Media ◽  
Unsaturated Hydraulic Conductivity

The science of soil-water physics and contaminant transport in porous media began a little more than a century ago. The first equation to quantify the flow of water is attributed to Darcy. The next major development for unsaturated media was made by Buckingham in 1907. Buckingham quantified the energy state of soil water based on the thermodynamic potential energy. Buckingham then introduced the concept of unsaturated hydraulic conductivity, a function of water content. The water flux as the product of the unsaturated hydraulic conductivity and the total potential gradient has become the accepted Buckingham-Darcy law. Two decades later, Richards applied the continuity equation to Buckingham's equation and obtained a general partial differential equation describing water flow in unsaturated soils. For combined water and solute transport, it had been recognized since the latter half of the 19th century that salts and water do not move uniformly. It wasn't until the middle of the 20th century that scientists began to understand the complex processes of diffusion, dispersion, and convection and to develop mathematical formulations for solute transport. Knowledge on water flow and solute transport processes has expanded greatly since the early part of the 20th century to the present.

scholarly journals Effects of oil field brine wastewater on saturated hydraulic conductivity of smectitic loam soils

2016 ◽  
Vol 96 (4) ◽  
pp. 496-503 ◽  
Author(s):  
Nathan E. Derby ◽  
Francis X.M. Casey ◽  
Thomas M. DeSutter
Keyword(s):  
Hydraulic Conductivity ◽  
Water Flow ◽  
Great Plains ◽  
Crop Production ◽  
Saturated Hydraulic Conductivity ◽  
Oil Field ◽  
Oil Well ◽  
High Sodium ◽  
Saturated Water ◽  
Western North Dakota

Spills of brine wastewater produced during oil well drilling are occurring more frequently in the Great Plains, resulting in crop production loss on affected soil. Remediation requires removal of salt from the topsoil, which might be accomplished by leaching to subsurface horizons or subsurface drains. A laboratory study determined the effects of brine on saturated hydraulic conductivity (Ks) of four nonimpacted surface soils from western North Dakota, USA. Repacked soil cores were subjected to saturated water flow, followed by one pore volume of brine. Subsequent saturated water flow leached brine from the soil and reduced Ks as much as 97% (0.086–0.003 cm h−1) within 24 h. Effluent total dissolved solids (TDS) approached 250 000 mg L−1 then declined (5 mg L−1) with continued leaching, but Ks did not increase. Removal of soluble salts during leaching increased the relative sodium concentrations (ESP > 55), causing clay swelling/dispersion and reduced Ks. Postbrine gypsum application (11.2 Mg ha−1) to replace exchangeable sodium with calcium did not improve Ks. This evidence suggests that if subsurface drainage is used for reclaiming brine-impacted soils that special attention be given to where dispersion/swelling is occurring, leaching water quality, and closely positioning calcium amendments within the high sodium zones.

scholarly journals The contrasting influence of short-term hypoxia on the hydraulic properties of cells and roots of wheat and lupin

2010 ◽  
Vol 37 (3) ◽  
pp. 183 ◽  
Author(s):  
Helen Bramley ◽  
Neil C. Turner ◽  
David W. Turner ◽  
Stephen D. Tyerman
Keyword(s):  
Hydraulic Conductivity ◽  
Water Flow ◽  
Hydraulic Properties ◽  
Turgor Pressure ◽  
Lupinus Luteus ◽  
Yellow Lupin ◽  
Cortical Cells ◽  
Crop Species ◽  
Wheat Roots ◽  
Root Cells

Little is known about water flow across intact root cells and roots in response to hypoxia. Responses may be rapid if regulated by aquaporin activity, but only if water crosses membranes. We measured the transport properties of roots and cortical cells of three important crop species in response to hypoxia (0.05 mol O2 m–3): wheat (Triticum aestivum L.), narrow-leafed lupin (Lupinus angustifolius L.) and yellow lupin (Lupinus luteus L.). Hypoxia influenced solute transport within minutes of exposure as indicated by increases in root pressure (Pr) and decreases in turgor pressure (Pc), but these effects were only significant in lupins. Re-aeration returned Pr to original levels in yellow lupin, but in narrow-leafed lupin, Pr declined to zero or lower values without recovery even when re-aerated. Hypoxia inhibited hydraulic conductivity of root cortical cells (Lpc) in all three species, but only inhibited hydraulic conductivity of roots (Lpr) in wheat, indicating different pathways for radial water flow across lupin and wheat roots. The inhibition of Lpr of wheat depended on the length of the root, and inhibition of Lpc in the endodermis could account for the changes in Lpr. During re-aeration, aquaporin activity increased in wheat roots causing an overshoot in Lpr. The results of this study demonstrate that the roots of these species not only vary in hydraulic properties but also vary in their sensitivity to the same external O2 concentration.

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