Numerical analysis of the hydrogeologic controls in a layered coastal aquifer system, Oahu, Hawaii, USA

Seawater intrusion processes, investigation and management: Recent advances and future challenges

“…Their findings help to explain the existence of thick mixing zones, such as in the lowpermeability caprock layer overlying a highly permeable volcanic aquifer in Oahu, Hawaii, USA [Oki et al, 1998]. Lu et al [2011] also found that neglecting layered heterogeneity would lead to the overestimation of the toe penetration length, provided that the inland head boundary remained constant.…”

Tidal effects on variations of fresh–saltwater interface and groundwater flow in a multilayered coastal aquifer on a volcanic island (Jeju Island, Korea)

“…A multilayered subsurface system can further complicate monitoring of the interface due to the heterogeneity of the aquifer matrix and the unknown lithological configuration of clay layers and lenses, and their possible continuation into the sea (Melloul and Goldenberg, 1997). Many studies have addressed the influence of the tide on the mean water levels and interactions between saline and fresh groundwater in multilayered coastal aquifers (Oki et al, 1998;Li and Jiao, 2003;Capaccioni et al, 2005). However few researches have been conducted on the measurement of the groundwater flow directions and velocities directly.…”

Groundwater flow in a relatively old oceanic volcanic island: The Betancuria area, Fuerteventura Island, Canary Islands, Spain

“…The Hawaiian Islands, an elongated set of islands and submarine mounts whose formation from a hot spot started about 70 Ma (million years) ago (Shaw et al, 1980), are geologically and hydrogeologically one of the best studied volcanic archipelagos. Hawaii, the largest of the Islands, is less than 6 Ma old (Shaw et al, 1980;Moore and Clague, 1992) and recent subaerial volcanism is characterized by relatively young volcanic rocks of high hydraulic conductivity (Oki et al, 1998;Gingerich and Voss, 2005). The Canary Islands are also a well known volcanic archipelago derived from hot spot activity (Burke and Wilson, 1972;Holik et al, 1991;Carracedo, 1999;Geldmacher et al, 2001;Patriat and Labails, 2006) with many similarities.…”