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Transport in a Horizontal Flow Chamber
Author(s) -
Sadeghi Ali M.,
Starr James L.
Publication year - 1992
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1992.03615995005600020043x
Subject(s) - inlet , mechanics , flow (mathematics) , groundwater , dispersion (optics) , groundwater flow , plume , hydrology (agriculture) , water flow , geology , environmental science , geotechnical engineering , geomorphology , physics , meteorology , optics , aquifer
A better understanding is needed of the factors that control the fate of chemicals that move laterally in shallow groundwater within fields to tile lines and drainage ditches and from fields to nearby streams or estuaries. A chamber was designed and used to simulate shallow groundwater flow in the field. The chamber, made of Plexiglas with dimensions 120 by 60 by 60 cm, was filled to a depth of 30 cm with sand. A multiport arrangement of 10‐mm‐diam. holes on a 5 by 5 cm grid on both end walls of the chamber provided a combination for quite uniform solute application at the inlet side, and allowed sampling simultaneously from all ports at the outlet side. As a first approximation, the flow and transport were assumed to be one dimensional, and a convective‐dispersive solute‐transport model was applied to the Cl breakthrough data of each of the 50 outlet ports in order to quantify the spatial distribution of the dispersion‐coefficient values at the outlet plate. Based on the inconsistency observed between measured and estimated pore‐water velocities and dispersion coefficients of each of the 50 outlet ports, it appears that the one‐dimensional model is not appropriate to adequately characterize transport parameter in this horizontal flow system.