Deriving Wetting Phase Fluid Hydraulic Conductivity Scanning Loops Using Unit-Pore-Throat Ensemble Model Framework
Date Issued
2009
Date
2009
Author(s)
Su, Wei-Ming
Abstract
Abstractollowing the research of Jheng(2004)and Fong(2006), based on Unit-Pore-Throat Ensemble Model (UPTEM), using the water-air soil retention curve( Curve), to estimate the relationship of “capillary pressure-saturation”( ) and “capillary pressure-permeability”( ) caused by water and Non-Aqueous Phase Liquid(NAPL) in the same soil. One objective of this research is reaching whole ensemble curve by increasing the number of UPT. The other objective is estimating curve more efficiently by finding a simple rule to get the relationship of capillary pressure and hydraulic conductivity. ain method is like Jheng(2004) establishing a hydraulic equivalent unit-pore-throat ensemble model by using experimental retention curve. Using the software － Surface Evolver to find water-NAPL interface and saturation of all pore-throat units in different capillary pressure. And then calculate the hydraulic conductance of pore-throat unit by hydraulic kinetics calculating software － CFDRC. At last, integrate the simulating results of all pore-throat units by statistics and estimate water－NAPL Curve of the soil sample.here are three problems solved in this research with the above-mentioned procedure：. In order to save time, keep the calculating results and combine different length factor in different soil samples, decide the unit length factor by testing. The effect of hydraulic conductance when length factor changes is provided that the result and relative conductance value calculated from original pore-throat unit are the same. . A simple rule to get the relationship between hydraulic conductance and throat size in different critical capillary pressure is found out by comparing the simulation results of different pore-throat units. So the hydraulic conductance of new inserted pore-throat units can be calculated by using the rule.. By using the simple rule, more hydraulic conductance can be calculated more easily and more efficiently. So the curve can be refined by inserting more pore-throat units.
Subjects
scanning loop
pore-throat unit
unit-pore-throat emsemble model
Type
thesis
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