Water Science and Engineering 2018, 11(2) 120-130 DOI:   https://doi.org/10.1016/j.wse.2018.06.002  ISSN: 1674-2370 CN: 32-1785/TV

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Keywords
Submarine groundwater discharge (SGD)
Radium isotopes
Radium mass balance model
SGD-associated nutrient fluxes
Daya Bay
Authors
Jing-yan Gao
Xue-jing Wang
Yan Zhang
Hai-long Li
PubMed
Article by Jing-yan Gao
Article by Xue-jing Wang
Article by Yan Zhang
Article by Hai-long Li

Estimating submarine groundwater discharge and associated nutrient inputs into Daya Bay during spring using radium isotopes

Jing-yan Gao a,b, Xue-jing Wang b,d, Yan Zhang c, Hai-long Li b,c, *

a School of Environment, Harbin Institute of Technology, Harbin 150001, China
b School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China
c State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Beijing 100083, China
d School of Water Resources and Hydropower Engineering, Wuhan University, Wuhan 430072, China

Abstract

Daya Bay, a semi-enclosed bay in the South China Sea, is well known for its aquaculture, agriculture, and tourism. In recent years, many environmental problems have emerged, such as the frequent (almost yearly) occurrence of harmful algal blooms and red tides. Therefore, investigations of submarine groundwater discharge (SGD) and associated nutrient inputs to this bay have important theoretical and practical significance to the protection of the ecological system. Such a study was conducted using short-lived radium isotopes 223Ra and 224Ra. The estimated SGD fluxes were 2.89 × 107 m3/d and 3.05 × 107 m3/d based on 223Ra and 224Ra, respectively. The average SGD flux was about 35 times greater than that of all the local rivers. The SGD-associated dissolved inorganic nitrogen (DIN) and dissolved inorganic phosphorus (DIP) fluxes ranged from 1.95 × 106 to 2.06 × 106 mol/d and from 5.72 × 104 to 6.04 × 104 mol/d, respectively. The average ratio of DIN to DIP fluxes in SGD was 34, much higher than that in local rivers (about 6.46), and about twice as large as the Redfield ratio (16). Our results indicate that SGD is a significant source of nutrients to the bay and may cause frequent occurrence of harmful algal blooms. This study provides baseline data for evaluating potential environmental effects due to urbanization and economic growth in this region.

Keywords Submarine groundwater discharge (SGD)   Radium isotopes   Radium mass balance model   SGD-associated nutrient fluxes   Daya Bay  
Received 2017-10-10 Revised 2018-01-17 Online: 2018-04-30 
DOI: https://doi.org/10.1016/j.wse.2018.06.002
Fund:

This work was supported by the National Key Basic Research Program of China (973 Program, Grants No. 2015CB452901 and 2015CB452902), and the National Natural Science Foundation of China (Grant No. 41430641).

Corresponding Authors: Hai-long Li
Email: lihailong@sustc.edu.cn
About author:

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