Submarine groundwater discharge at Kahana Bay, Oahu, 1997-2001: in situ CTD and water chemistry tracer data (NODC Accession 0011399)

Submarine groundwater discharge (SGD) is neither well understood nor commonly investigated in Hawaii, but it is recognized as a potential pollution source to coastal environments. Between 1997 and 2001, this study located and quantified both total SGD and the terrestrial SGD fraction in Kahana Bay, Oahu. CTD casts were used to profile the water structure and identify potential areas of SGD impact in the bay. Lee-type seepage meters were used to measure SGD rates and collect samples of SGD directly. Radon-222, Si, Cl., and total alkalinity (Ta) were used as natural tracers to measure the terrestrial groundwater fraction within SGD. Nutrient concentrations were also measured to calculate total nutrient fluxes into the bay via SGD. (NODC Accession 0011399)

夏威夷地区的海底地下水排泄（Submarine Groundwater Discharge, SGD）尚未得到充分认知与系统研究，但其被认定为近岸环境的潜在污染源。1997年至2001年间，本研究针对瓦胡岛卡哈纳湾的总海底地下水排泄及其陆地地下水排泄组分开展了定位与定量分析。研究采用CTD剖面测量获取水体结构剖面，以识别海湾内受SGD影响的潜在区域；使用Lee型渗流计测定SGD排泄速率并直接采集SGD样本。以氡-222、硅（Si）、氯（Cl）及总碱度（Total Alkalinity, Ta）作为天然示踪剂，量化SGD中的陆地地下水占比；同时测定营养盐浓度，计算通过SGD输入海湾的总营养盐通量。（NODC馆藏编号：NODC Accession 0011399）