Spatial Distribution of Submarine Groundwater Discharge and Associated Nutrients within a Local Coastal Area

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• 作者：Takahiro Hosono ; Masahiko Ono ; William C. Burnett ; Takahiro Tokunaga ; Makoto Taniguchi ; Tomoya Akimichi
• 刊名：Environmental Science & Technology (ES&T)
• 出版年：2012
• 出版时间：May 15, 2012
• 年：2012
• 卷：46
• 期：10
• 页码：5319-5326
• 全文大小：529K
• 年卷期：v.46,no.10(May 15, 2012)
• ISSN：1520-5851

文摘

To understand the local-scale distribution of submarine groundwater discharge (SGD) and dissolved nutrients, a multiple-detector ²²²Rn monitoring survey was undertaken along the Mt. Chokai volcanic coast in northern Japan. The surveys revealed that the highest SGD (calculated to be 6.2 脳 10⁴ m³ d^鈥?, within an area of 2 脳 10⁴ m²) with the greatest nutrient fluxes (sum of NO₃^{鈥?/sup>, NO₂鈥?/sup>, and NH₄+ (DIN): 9.2 脳 102 mol d鈥?; PO₄3鈥?/sup> (DIP): 56 mol d鈥?) is present at the edge of the youngest volcanic lava flow in the area. Recharged groundwater transports nutrients through porous volcanic flows and discharges as SGD near shore. Our results demonstrate that the spatial distribution of SGD in the study area is closely regulated by the local geology and topography. Furthermore, we show that continuous 222Rn monitoring with a multidetector system at boat speeds of 1鈥? knots provides details at a scale one order of magnitude greater than has been reported previously. In addition, the results of our study suggest that SGD-borne DIP may play an important role in the important local oyster production.}