نتایج جستجو برای: dispersivity

تعداد نتایج: 244  

Journal: :Water Resources Research 2022

Hydrodynamic dispersion in flow through porous media is an essential phenomenon many geosystems. While of Newtonian fluids relatively well-understood, subsurface applications, such as groundwater remediation, use the flooding system with non-Newtonian fluids, polymer oxidants. Despite its significance, however, very limited studies have been carried out focusing on hydrodynamic fluids. The pres...

2008
DIRK SCHULZE-MAKUCH DOUGLAS S. CHERKAUER Dirk Schulze-Makuch Douglas S. Cherkauer

Tests on several scales were analyzed and conducted in a dolomite aquifer of southeastern Wisconsin to examine the variation of hydraulic conductivity and longitudinal dispersivity with scale of measurement. Scale behavior of hydraulic conductivity was shown to be dependent on the hydrofacies. In vuggy fades dominated by porous flow hydraulic conductivity increased relative to scale linearly wi...

Journal: :Water Science & Technology: Water Supply 2021

Abstract Dispersivity is a measurable parameter in soil porous media that used for studying the transport of contaminants to groundwater. The value this depends on various factors, including kind (homogeneous or heterogeneous), flow velocity, initial contaminant concentration, travel distance, and sampling method. A physical model with dimensions 0.10 m width, 0.80 height, 1.10 length was const...

2007
HUBERT J. MOREL-SEYTOUX MAHMOOD NACHABE Mahmood Nachabe

In the case of straight flow but with hydraulic conductivity varying in a transverse direction, the distribution of hydraulic conductivity has been determined for which the breakthrough curve due to convection only will have the same analytical form as the onedimensional convection/dispersion equation solution at the outlet end of a porous medium. That distribution is found exactly and it is ve...

2011
A. G. Hunt B. Ghanbarian-Alavijeh

A recently introduced theory of solute transport in porous media is tested by comparison with experiment. The solute transport is predicted using an adaptation of the cluster statistics of percolation theory to critical path analysis together with knowledge of how the structure of such percolation clusters affects the time of transport across them. Only the effects of a single scale of medium h...

Journal: :International Journal of Engineering Applied Sciences and Technology 2019

ژورنال: علوم آب و خاک 2019

Deterioration of groundwater resources in coastal regions due to the progression of saline water in aquifers in these regions is currently one of the important issues in providing water needs in these areas. In coastal regions, saline water enters the aquifer from below in shape of wedge. Due to the difference in the density between fresh and salty water, an interface zone forms between two flu...

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