Collaborative Research: Assessment of Groundwater Inputs into Coastal Waters of Hawaii via Natural Tracers and Aerial Imagery

在过去的几年里，已经开发了一些方法来评估局部范围内的海底地下水排放（SGD）。 然而，区域规模评价的方法（即，100公里）没有发生。 为此，夏威夷大学的一位科学家与佛罗里达州立大学的一位科学家合作，计划开发一种三层方法，使用以下方法在区域尺度上评估SGD入海：（1）高分辨率，温度校准（2）通过天然地球化学示踪剂对选定地点进行地面实况调查（223 Ra、224 Ra、227 Th、228 Th）;以及（3）通过类型学放大结果。 PI选择科纳海岸作为研究地点，因为其表观SGD高，排放集中，缺乏地表排水。 一旦排放建立，氮物种，总磷，无机磷，二氧化硅和总叶绿素的通量将计算科纳海岸，并放置在一个区域和全球范围内通过比较流通量。 关于更广泛的影响，这项研究将为科学家提供一种新的方法，以评估区域范围内的海底地下水排放，并对海底地下水排放对沿海海洋水收支和生物地球化学循环的影响产生新的见解。 这项研究的益处将从海洋学家延伸到水文学家，再到沿海和水资源管理人员。 来自夏威夷大学和佛罗里达州立大学的学生将参加这项研究。

ABSTRACTOCE-0451379Over the past few years, some methods have been developed to assess submarine groundwater discharge (SGD) on a local scale. However, methodologies for regional scale evaluations (i.e., 100 km) have not occurred. For this reason, a scientist from the University of Hawaii, in collaboration with a scientist from Florida State University, plan to develop a three tiered approach to assess SGD into the sea at regional scales using the following methods: (1) high resolution, temperature calibrated (0.1'C) geo-corrected aerial infrared surveys; (2) ground-truthing selected sites via natural geochemical tracers (223Ra, 224Ra, 227Th, 228Th); and (3) upscaling the results via typology. The PIs have selected the Kona coast for their study site because of its high apparent SGD, focused nature of the discharge, and lack of surface drainage. Once discharge is established, fluxes of nitrogen species, total phosphorus, inorganic phosphorus, silica, and total chlorophyll will be calculated for the Kona coast and placed within a regional and global context by comparison to stream fluxes. As regards broader impacts, this study will provide scientists with a new method to assess submarine groundwater discharge on a regional scale, as well as yield new insights into the impact of submarine groundwater discharge on water budgets and biogeochemical cycles in the coastal ocean. The benefits of this study will extend from oceanographers to hydrologist to coastal and water resource managers. Students from both the University of Hawaii and Florida State University will participate in the research study.