Evaluation of major dike-impounded ground-water reservoirs, Island of Oahu, with a section on flow hydraulics in dike tunnels in Hawaii

Takasaki, K.J.; Mink, John F.

doi:10.3133/ofr811119

Cited by 11 publications

(5 citation statements)

References 2 publications

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“…Geohydrologic barriers internally divide the study areas into smaller ground-water areas ( fig. 3B) that have been referred to by Stearns and Vaksvik (1935), Visher and Mink (1964), Takasaki and Mink (1985), and by the authors of ground-water studies cited in the next section of this report.…”

Section: Study Areamentioning

confidence: 85%

Water Budget and the Effects of Land-Use Changes on Ground-Water Recharge, Oahu, Hawaii

Shade¹,

Nichols²

1996

Professional Paper

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Section: Study Areamentioning

confidence: 85%

Water Budget and the Effects of Land-Use Changes on Ground-Water Recharge, Oahu, Hawaii

Shade¹,

Nichols²

1996

Professional Paper

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“…1. In the zones of intrusions (central zone, rift zones), the swarms of subvertical dikes can create impermeable barriers that impound bodies of water at high elevations (Stearns 1942;Takasaki 1981;Jackson and Kauahikaua 1987a). 2.…”

Section: Resistivity Of Volcanic Rocksmentioning

confidence: 99%

Geoelectrical structure of the central zone of Piton de la Fournaise volcano (Réunion)

Lénat¹,

et al. 2000

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A study of the geoelectrical structure of the central part of Piton de la Fournaise volcano (Réunion, Indian Ocean) was made using direct current electrical (DC) and transient electromagnetic soundings (TEM). Piton de la Fournaise is a highly active oceanic basaltic shield and has been active for more than half a million years. Joint interpretation of the DC and TEM data allows us to obtain reliable 1D models of the resistivity distribution. The depth of investigation is of the order of 1.5 km but varies with the resistivity pattern encountered at each sounding. Two-dimensional resistivity cross sections were constructed by interpolation between the soundings of the 1D interpreted models. Conductors with resistivities less than 100 ohm-m are present at depth beneath all of the soundings and are located high in the volcanic edifice at elevations between 2000 and 1200 m. The deepest conductor has a resistivity less than 20 ohm-m for soundings located inside the Enclos and less than 60-100 ohm-m for soundings outside the Enclos. From the resistivity distributions, two zones are distinguished: (a) the central zone of the Enclos; and (b) the outer zone beyond the Enclos. Beneath the highly active summit area, the conductor rises to within a few hundred meters of the surface. This bulge coincides with a 2000-mV self-potential anomaly. Low-resistivity zones are inferred to show the presence of a hydrothermal system where alteration by steam and hot water has lowered the resistivity of the rocks. Farther from the summit, but inside the Enclos, the depth to the conductive layers increases to approximately 1 km and is inferred to be a deepening of the hydrothermally altered zone. Outside of the Enclos, the nature of the deep, conductive layers is not established. The observed resistivities suggest the presence of hydrated minerals, which could be found in landslide breccias, in hydrothermally altered zones, or in thick pyroclastic layers. Such formations often create perched water tables. The known occurrence of large eastward-moving landslides in the evolution of Piton de la Fournaise strongly suggests that large volumes of breccias should exist in the interior of the volcano; however, extensive breccia deposits are not observed at the bottom of the deep valleys that incise the volcano to elevations lower than those determined for the top of the conductors. The presence of the center of Piton de la Fournaise beneath the Plaine des Sables area during earlier volcanic stages (ca. 0.5 to 0.150 Ma) may have resulted in broad hydrothermal alteration of this zone. However, this interpretation cannot account for the low resistivities in peripheral zones. It is not presently possible to discriminate between these general interpretations. In addition, the nature of the deep conductors may be different in each zone. Whatever the geologic nature of these conductive layers, their presence indicates a major change of lithology at depth, unexpected for a shield volcano such as Piton de la Fournaise.

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“…The He'eia watershed lies in a part of the Ko'olau Range where dikes have intruded the lava flows of the shield volcano (Stearns and Vaksvik, 1935;Takasaki and Mink, 1985;Walker, 1987). The hydrology of dike-intruded areas can be conceptualized as a system of compartments in which groundwater is impounded in compartments of high-permeability lava flows between the low-permeability dikes; this setting is known as dike-impounded groundwater (Takasaki and Mink, 1985;others 2018, Izuka andRotzoll, 2023) (fig. 3).…”

Section: Settingmentioning

confidence: 99%

“…4). The alignment results in preferential groundwater flow in the direction of the dikes (Hirashima, 1962;Takasaki and Mink, 1985;Walker, 1987).…”

Section: Settingmentioning

confidence: 99%

Groundwater and surface-water interactions in the He‘eia watershed, O‘ahu, Hawai‘i—Insights from analysis of historical data and numerical groundwater-model simulations

Izuka,

Kāne,

Rotzoll

2024

Scientific Investigations Report

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Center (PIWSC) in cooperation with the Honolulu Board of Water Supply (HBWS). Chui Ling Cheng (USGS) contributed substantially to the study's design. Barry Usagawa (HBWS), Nancy Matsumoto (HBWS), and Darwina Griffin (HBWS) assisted in providing some of the data that were analyzed in this study. Casey Jones (USGS) and Sarah Rosa (USGS) provided peer reviews of this report. Geographic NamesGeographic names in this report are largely consistent with the U.S. Geological Survey (USGS) Board on Geographic Names (http://geonames.usgs.gov/), including the use of the 'okina (') and kahakō (ˉ) diacritical marks in Hawaiian names. The diacritical marks are not used, however, in anglicized derivations from Hawaiian names (for example, the 'okina appears in the name "Hawai'i" but not in the derivation "Hawaiian"), or where a place name appears without the diacritical marks in an established name or title in a cited reference or database (for example, well names in this report appear as they do in state and local government databases). Names of geologic formations and features are consistent with the State of Hawai'i geologic map by Sherrod and others (2021).

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Evaluation of major dike-impounded ground-water reservoirs, Island of Oahu, with a section on flow hydraulics in dike tunnels in Hawaii

Cited by 11 publications

References 2 publications

Water Budget and the Effects of Land-Use Changes on Ground-Water Recharge, Oahu, Hawaii

Water Budget and the Effects of Land-Use Changes on Ground-Water Recharge, Oahu, Hawaii

Geoelectrical structure of the central zone of Piton de la Fournaise volcano (Réunion)

Groundwater and surface-water interactions in the He‘eia watershed, O‘ahu, Hawai‘i—Insights from analysis of historical data and numerical groundwater-model simulations

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