Nutrient inputs from submarine groundwater discharge (SGD) in Masan Bay, an embayment surrounded by heavily industrialized cities, Korea

被引:93
作者
Lee, Yong-Woo [1 ]
Hwang, Dong-Woon [1 ,2 ]
Kim, Guebuem [1 ]
Lee, Won-Chan [2 ]
Oh, Hyun-Taik [2 ]
机构
[1] Seoul Natl Univ, Sch Earth & Environm Sci RIO, Seoul 151747, South Korea
[2] Natl Fisheries Res & Dev Inst, Pusan 619902, South Korea
关键词
Submarine groundwater discharge (SGD); Ra-226; Nutrients; Eutrophication; Red tide; Masan Bay; RADIUM ISOTOPES; BORNE NUTRIENTS; TRANSPORT; BLOOMS; EUTROPHICATION; NITROGEN; ESTUARY; ISLAND; SEA;
D O I
10.1016/j.scitotenv.2008.04.013
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
In order to estimate the magnitude of submarine groundwater discharge (SGD) and the associated nutrient fluxes in Masan Bay on the southern coast of Korea, we measured the concentrations of Ra-226 and nutrients in seawater, brackish groundwater, and stream water in May and August 2006. Gauging unidentified nutrient fluxes through SGD is very important in this bay since diatom red tides have been occurring from April to October every year since the 1980s. Based on a Ra-226 mass balance model, the submarine inputs of coastal groundwater were estimated to be 4.8 x 10(6) and 5.7 x 10(6) m(3) d(-1) (61 and 71 L m(-2) d(-1)) in May and August, respectively, which were approximately 840% and 540% of the surface water discharge into the bay. The fluxes of dissolved inorganic phosphorus (DIP) and silicate (DSi) through SGD were 2-3 fold higher than those via stream water, while the fluxes of dissolved inorganic nitrogen (DIN) were comparable to those from surface waters during both sampling periods. Nutrient fluxes through stream waters relative to those from SGD were more significant in the inner part of the bay, which appears to be due to the direct influence of heavily polluted stream waters. Our study shows that the large and continuous supply of inorganic nutrients through SGD may play an important role in eutrophication and the occurrence of red tides in this bay, which should be taken into consideration in the environmental management of the bay. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码:3181 / 3188
页数:8
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