Analysis of an anisotropic coastal aquifer system using variable-density flow and solute transport simulation

Souza, William R.; Voss, Clifford I.

doi:10.1016/0022-1694(87)90087-4

Cited by 102 publications

(88 citation statements)

References 17 publications

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“…The regional groundwater flow pattern in volcanic-rock aquifers can be summarized as follows (after Souza and Voss, 1987;Oki, 1998): (1) most of the recharge of fresh groundwater from rainfall occurs in the mountainous interior areas, and groundwater flow has a downward component in the inland recharge areas; (2) groundwater flow is from inland recharge areas towards coastal discharge areas and is generally horizontal; (3) in the coastal area, a caprock impedes groundwater discharge to the ocean, and the flow of fresh and brackish water generally is upward into the caprock; and (4) the caprock also impedes the inflow of saltwater into the volcanic-rock aquifer ( fig. 2).…”

Section: Groundwater Dynamics In the Freshwater Lensmentioning

confidence: 99%

Effects of groundwater withdrawal on borehole flow and salinity measured in deep monitor wells in Hawai'i: implications for groundwater management

Rotzoll¹

2010

Scientific Investigations Report

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FRONT COVERSchematic cross section of deep monitor wells penetrating through the freshwater lens into the underlying saltwater in a volcanic-rock aquifer, showing how upward and downward borehole flow affects the salinity distribution with depth in the wells. This report and any updates to it are available online at: http://pubs.usgs.gov/sir/2010/5058/ For more information on the USGS-the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment, visit http://www.usgs.gov or call 1-888-ASK-USGS For an overview of USGS information products, including maps, imagery, and publications, visit http://www.usgs.gov/pubprod Effects of Groundwater Withdrawal on Borehole Flow and Salinity Measured in Deep MonitorTo order this and other USGS information products, visit http://store.usgs.gov Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.Although this report is in the public domain, permission must be secured from the individual copyright owners to reproduce any copyrighted materials contained within this report.Suggested citation: Rotzoll, Kolja, 2010, Effects of groundwater withdrawal on borehole flow and salinity measured in deep monitor wells in Hawai'i-implications for groundwater management: U.S. Geological Survey Scientific Investigations Report 2010-5058, 42 p.Vertical salinity profiles measured in deep monitor wells commonly are used to estimate the volume of freshwater in aquifers in Hawaiÿi. Water-resource managers use information from salinity profiles to monitor changes in the freshwater volume over time and determine appropriate groundwater withdrawal rates. Natural or anthropogenic factors can cause water in deep monitor wells to flow vertically within the borehole, and this may cause the observed salinity distribution in the monitor well to be a poor indicator of the salinity distribution in the aquifer, resulting in an underestimation or overestimation of the volume of freshwater stored in an aquifer. Thus, a better understanding of how borehole flow affects the measured vertical distribution of salinity in monitor wells is needed for proper analysis and interpretation of vertical salinity profiles and sound management of the groundwater resources. Indicators of Borehole FlowSalinity profiles from paired shallow and deep monitor wells may differ over the common depth interval of the wells. Observed differences can be explained by borehole flow moving brackish water upward in the deep well, an interpretation supported by flow measurements. Additionally, steplike changes in salinity or temperature with depth may be indicative of borehole flow over a discrete depth interval, and such changes are evident to some extent in all available profiles. Vertical flow may affect hundreds of feet of a salinity profile, and this occurs commonly in monitor wells located in southern Oÿahu. Steplike changes in salinity that do not affect long sections (less than 70 ft) of a profile may be r...

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Section: Groundwater Dynamics In the Freshwater Lensmentioning

confidence: 99%

Effects of groundwater withdrawal on borehole flow and salinity measured in deep monitor wells in Hawai'i: implications for groundwater management

Rotzoll¹

2010

Scientific Investigations Report

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“…Drill cores collected beneath pineapple fields of central Oahu near Mililani indicate the presence of saprolite, weathered rock retaining the structural and textural features of the parent material, to depths of at least 100 ft (Miller, 1987). Beneath stream channels, where water continu- Rosenau and others, 1971Soroos, 1973, p. 225 Dale, 1978Soroos, 1973, p. 221-223 Eyre and Nichols, in press Soroos, 1973, p. 160-216 Williams and Soroos, 1973, p. 27, 55 Dale, 1974Dale, 1974Mink, 1980Liu and others, 1981Souza and Voss, 1987Eyre and Nichols, in press Soroos, 1973, p. 158-159 Soroos, 1973, p. 152-155 Williams and Soroos, 1973, p. 137 Ishizaki and others, 1967Wentworth, 1938Wentworth, 1938Soroos, 1973 1 Based on a reported transmissivity of 3 million gallons per day per foot and an assumed flow depth of 738 ft. 2 4,500 feet per day longitudinal to lava flow direction; 1,500 feet per day lateral to lava flow direction. 3 Honolulu includes the Moanalua, Kalihi, Beretania, and Kaimuki ground-water areas.…”

Section: Hydraulic Conductivitymentioning

confidence: 99%

“…This estimate is largely controlled by the hydraulicconductivity value assigned to the mud and weathered basalt layers. Souza and Voss (1987) treated the caprock as a homogeneous and isotropic unit in a vertical cross-sectional model of the Pearl Harbor ground-water area. The hydraulic conductivity of the caprock was estimated to be about 0.15 ft/d (Souza and Voss, 1987).…”

Section: Hydraulic Conductivitymentioning

confidence: 99%

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Geohydrology of the Central Oahu, Hawaii, ground-water flow system and numerical simulation of the effects of additional pumping

Oki¹

1998

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“…These coastal deposits are similar to some of those found on Oahu. Coastal deposits and underlying weathered volcanic rocks impede the seaward discharge of freshwater on Oahu (Souza and Voss, 1987) and probably also do on southern Molokai. The permeability of the interbedded coastal deposits may vary widely, from low-permeability compacted alluvium to cavernous limestone deposits.…”

Section: Coastal Depositsmentioning

confidence: 99%

Geohydrology and Numerical Simulation of the Ground-Water Flow System of Molokai, Hawaii

Oki¹

1997

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Analysis of an anisotropic coastal aquifer system using variable-density flow and solute transport simulation

Cited by 102 publications

References 17 publications

Effects of groundwater withdrawal on borehole flow and salinity measured in deep monitor wells in Hawai'i: implications for groundwater management

Effects of groundwater withdrawal on borehole flow and salinity measured in deep monitor wells in Hawai'i: implications for groundwater management

Geohydrology of the Central Oahu, Hawaii, ground-water flow system and numerical simulation of the effects of additional pumping

Geohydrology and Numerical Simulation of the Ground-Water Flow System of Molokai, Hawaii

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