A Research Study About Maunalua Bay

1113 Words May 25th, 2016 5 Pages
2. Study region
2.1 Site details
Maunalua Bay is an 8 km embayment located on the island of Oʻahu, Hawaiʻi, with three primary regions of groundwater discharge: Black Point, Kawaikui, and Wailupe (Richardson et al., 2015). Two of these groundwater-influenced coastal locations, Black Point and Wailupe, were considered for this study (Figure 1). Three sites (a, ‘high GW’; b, ‘intermediate GW’; and c, ‘low GW’ zones) that spanned a salinity gradient were monitored from each reef. Site A at Black Point was approximately 5 m offshore of the dominant groundwater submarine spring while site A at Wailupe was situated within 2 m of the dominant groundwater seep. These seeps are roughly 0.5 m in diameter and thought to be fed by preferential flow of fresh groundwater through fractures or lava tubes. They discharge low salinity groundwater at a relatively constant rate and typically only shut off during high tides associated with spring tidal ranges. Both sites also experience diffuse groundwater seepage from portions of the shoreline. The groundwater springs monitored herein were selected over the seepage faces as they have been shown to discharge a significantly larger volume of groundwater (Ganguli et al., 2014, Swarzenski et al., 2014, Richardson et al., 2015). Additionally, the diffuse seepage faces and groundwater springs at each study area have identical geochemical endmember compositions, so groundwater geochemistry from the springs and seepage faces produce consistent mixing…
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