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WRRCTR No.175 Modeling of trace organic (DBCP) transport in Pearl Harbor aquifer, Oahu, Hawaii: Method of characteristics, phase II

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Title: WRRCTR No.175 Modeling of trace organic (DBCP) transport in Pearl Harbor aquifer, Oahu, Hawaii: Method of characteristics, phase II
Authors: Orr, Shlomo
Lau, L. Stephen
Keywords: groundwater contamination
organic pesticides
mathematical models
sensitivity analysis
solute transport
show 9 moregroundwater movement
vadose
DBCP
method of characteristics
basaltic aquifer
Mililani wells
Waipio wells
Pearl Harbor aquifer
Oahu

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LC Subject Headings: Dibromochloropropane -- Hawaii -- Oahu -- Environmental aspects.
Groundwater -- Pollution -- Hawaii -- Oahu.
Groundwater flow -- Hawaii -- Oahu.
Organic water pollutants -- Hawaii -- Oahu.
Issue Date: Sep 1988
Publisher: Water Resources Research Center, University of Hawaii at Manoa
Citation: Orr S, Lau LS. 1988. WRRCTR No.175 Modeling of trace organic (DBCP) transport in Pearl Harbor aquifer, Oahu, Hawaii: method of characteristics, phase II. Honolulu (HI): Water Resources Research Center, University of Hawaii at Manoa. WRRC technical report, 175.
Series/Report no.: WRRC Technical Report
175
Abstract: A numerical model, based on the method of characteristics (MOC), is used to simulate the transport of
DBCP through the basaltic aquifer in Mililani and vicinity and to predict the potential downstream contamination including Waipio Heights Wells II. The Phase II modeling is intended to improve upon the Phase I mixing-cell model. For the two-dimensional solute transport model and the large scale used, the aquifer is considered as homogeneous and isotropic, the solute transport as occurring in the upper irrigation-return lens, and the dispersion as Fickian. The lowest and the most abundant concentration detected in the deep core samples was assumed to be the input concentration at the water table, deep below the pineapple fields. This rather optimistic assumption would render a rather optimistic recovery of the aquifer. The results suggest that predicted DBCP levels will decline to below 20 ppt for the Mililani wells around the year 2000. Waipio Heights Wells II would experience DBCP increase up to 22 ppt around the year2000, then decline slowly. Increased pumpage from Mililani Wells II would hasten aquifer recovery. The mutual relationship between the calibration of the solute transport and the groundwater flow models emphasizes the need for a more precise flow model that more precisely predicts dynamic changes in pumping stresses and recharge. The two models show a general similarity in the prediction of aquifer recovery, which is, however, slightly faster in the mixing-cell model. The mixing-cell model tends to overestimate dispersion, the lateral in particular. Both models show that leachate concentrations as low as 0.1 ppb below the top few feet of soil can contaminate a deep aquifer.
Description: Office of Environment Quality Control, Department of Health Grant/Contract No. T-377
Pages/Duration: viii + 42 pages
URI/DOI: http://hdl.handle.net/10125/2022
Appears in Collections:WRRC Technical Reports



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