Nutrient inputs through submarine groundwater discharge in an embayment: A radon investigation in Daya Bay, China

Wang, Xuejing1,2,3; Li, Hailong1,2,4,5; Yang, Jinzhong3; Zheng, Chunmiao1,2; Zhang, Yan6; An, An6; Zhang, Meng6; Xiao, Kai6

2017-08

10.1016/j.jhydrol.2017.02.036

JOURNAL OF HYDROLOGY   影响因子和分区

0022-1694

1879-2707

Daya Bay, a semi-closed bay of the South China Sea, is famous for its aquaculture, agriculture and tourism. Although routine environmental investigations in the bay have been conducted since the early 1980s, evaluations of submarine groundwater discharge (SGD), an important process in exchange between groundwater and coastal seawater, and its environmental impacts have never been reported. In this study, naturally occurring radon isotope (Rn-222) was measured continuously at two sites (north-west and middle-east sites) and used as a tracer to estimate SGD and associated nutrient inputs into the bay. The SGD rates estimated based on the Rn-222 mass balance model were, on average, 28.2 cm/d at north-west site and 30.9 cm/d at middle-east site. The large SGD rate at middle-east site may be due to the large tidal amplitude and the sandy component with high permeability in sediments. The SGD-driven nutrient fluxes, which were calculated as the product of SGD flux and the difference of nutrient concentrations between coastal groundwater and seawater, were 3.28 x 10(5) mol/d for dissolved nitrates (NO3-N), 5.84 x 10(3) mol/d for dissolved inorganic phosphorous (DIP), and 8.97 x 10(5) mol/d for reactive silicate (Si). These nutrient inputs are comparable to or even higher than those supplied by local rivers. In addition, these SGD-driven nutrients have a nitrogen-phosphorous ratio as high as 43, which may significantly affect the ecology of coastal waters and lead to frequent occurrence of harmful algal blooms. (C) 2017 Elsevier B.V. All rights reserved.

Submarine groundwater discharge Radon isotope Mass balance model Nutrient loading Daya Bay

SCI ; EI

英语

第一 ; 通讯

Shenzhen Municipal Science and Technology Innovation Committee[ZDSY20150831141712549]

Engineering ; Geology ; Water Resources

Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources

WOS:000407538800060

ELSEVIER SCIENCE BV

20171003407947

Discharge (fluid mechanics) ; Environmental impact ; Groundwater ; Isotopes ; Phosphorus ; Radon ; Seawater ; Silicates ; Submarines

Groundwater:444.2 ; Environmental Impact and Protection:454.2 ; Seawater, Tides and Waves:471.4 ; Combat Naval Vessels:672.1 ; Chemical Products Generally:804

ENGINEERING

Web of Science

1.South Univ Sci & Technol China, Sch Environm Sci & Engn, Shenzhen 518055, Peoples R China
2.South Univ Sci & Technol China, Key Lab Soil & Groundwater Pollut Control Shenzhe, Shenzhen, Peoples R China
3.Wuhan Univ, Sch Water Resources & Hydropower Engn, Wuhan, Hubei, Peoples R China
4.China Univ Geosci, State Key Lab Biogeol & Environm Geol, Beijing, Peoples R China
5.China Univ Geosci, MOE Key Lab Groundwater Circulat & Environm Evolu, Beijing, Peoples R China
6.China Univ Geosci, Sch Water Resources & Environm, Beijing, Peoples R China

Wang, Xuejing,Li, Hailong,Yang, Jinzhong,et al. Nutrient inputs through submarine groundwater discharge in an embayment: A radon investigation in Daya Bay, China[J]. JOURNAL OF HYDROLOGY,2017,551:784-792.

Wang, Xuejing.,Li, Hailong.,Yang, Jinzhong.,Zheng, Chunmiao.,Zhang, Yan.,...&Xiao, Kai.(2017).Nutrient inputs through submarine groundwater discharge in an embayment: A radon investigation in Daya Bay, China.JOURNAL OF HYDROLOGY,551,784-792.

Wang, Xuejing,et al."Nutrient inputs through submarine groundwater discharge in an embayment: A radon investigation in Daya Bay, China".JOURNAL OF HYDROLOGY 551(2017):784-792.