نتایج جستجو برای: partially saturated media
تعداد نتایج: 437704 فیلتر نتایج به سال:
A numerical approach for approximating statistical moments of hydraulic heads of variably saturated flows in multi-dimensional porous media is developed. The approximation relies on a first-order Taylor series expansion of a finite element flow model and an adjoint state numerical method for variably saturated flows to evaluate sensitivities. This approach can be employed to analyze uncertainti...
A study of body waves in elastic porous media saturated by two immiscible Newtonianfluids is presented. We analytically show the existence of three compressionalwaves and one rotationalwave in an infinite porous medium. The first and second compressional waves are analogousto the fast and slow compressionalwaves in Biot's theory. The third compressionalwave is associated with the pressure diffe...
The aim of this study is to evaluate seasonal enhancement nitrogen removal on domestic wastewater treatment performance by partially saturated and HBCWs. To achieve this, two HBCWs consisting a vertical subsurface flow constructed wetland, followed horizontal wetland (VSSF-HSSF) were evaluated. Two saturation levels used: (a) HB1:VSSF1 (0.6 m)-HSSF1 (0.15 m), (b) HB2: VSSF2 (0.8 m)-HSSF2 (0.25 ...
The saturated hydraulic conductivity (Ks ) is a key characteristic of porous media, describing the rate of water flow through saturated porous media. It is an indispensable parameter in a broad range of simulation models that quantify saturated and/or unsaturated water flow. The constant-head permeameter test is a common laboratory method to determine Ks on undisturbed soil samples collected fr...
OBJECTIVE Impact of mandatory trans fat labelling on US snack food introductions is examined. DESIGN Using label information, lipid ingredients and fat profiles are compared pre- and post-labelling. SETTING Key products in the US snack food industry contribute significant amounts of artificial trans fat. Industry efforts to reformulate products to lower trans fat may alter the overall fat p...
This paper discusses a new nuclear magnetic resonance (NMR) method that can provide wettability, saturation, and oil viscosity values in rocks partially saturated with oil and brine. The method takes advantage of two new technological advances in NMR well logging—the MRF* Magnetic Resonance Fluid Characterization Method and NMR “diffusion-editing” (DE) pulse sequences. We discuss the principles...
Soil salinization is a major cause of soil degradation and hampers plant growth. For soils saturated with saline water, the evaporation water induces accumulation salt near top soil. The remaining liquid gets an increasingly larger density due to salt, giving gravitationally unstable situation, where instabilities in form fingers can form. These hence lead net downwards transport salt. We here ...
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