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Discussion papers | Copyright
https://doi.org/10.5194/hess-2018-207
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 07 May 2018

Research article | 07 May 2018

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This discussion paper is a preprint. It has been under review for the journal Hydrology and Earth System Sciences (HESS). The manuscript was not accepted for further review after discussion.

Evaluation of flushing time, groundwater discharge and associated nutrient fluxes in Daya Bay, China

Yan Zhang1,2,3,*, Meng Zhang4,*, Hailong Li2,3,*, Xuejing Wang3, Wenjing Qu1,2, Xin Luo5,6, Kai Xiao1,2, and Xiaolang Zhang3 Yan Zhang et al.
  • 1MOE Key Laboratory of Groundwater Circulation and Environment Evolution and School of Water Resources and Environment, China University of Geosciences-Beijing, Beijing 100083, China
  • 2State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences-Beijing, Beijing 100083, China
  • 3School of Environmental Science and Engineering and Shenzhen Key Laboratory of Soil and Groundwater Pollution Control, Southern University of Science and Technology, Shenzhen 518055, China
  • 4Zhong Di Bao Lian (Beijing) Land and Resource Exploration Technology Co., Ltd, Beijing 100193, China
  • 5Department of Earth Sciences, The University of Hong Kong, Hong Kong, China
  • 6Shenzhen Research Institude, The University of Hong Kong, Shenzhen, China
  • *These authors contributed equally to this work.

Abstract. Radium quartet have been widely used to quantify the flushing time of water body and submarine groundwater discharge (SGD) in coastal zones. However, previous apparent age model based on mass balance of radium isotopes usually neglected the effects of rivers, open sea water end-member, sedimentary input, atmospheric deposits and recirculated seawater (RSGD). To enhance accuracy in estimating flushing time and SGD, here we present an improved model and then apply in Daya Bay, China. The flushing time estimated by the improved model is 11.8–27.7d in Daya Bay. It is found that the previous model overestimated the flushing time by 10.7%–103%. Considering the radium losses caused by RSGD, the SGD flux is estimated to be (3.87–5.09)×107m3d−1 based on the derived flushing time. The SGD associated nutrient fluxes are estimated to be (1.36–1.76)×106mold−1 and (2.53–3.26)×104mold−1 for DIN and DIP, respectively, about 20 times greater than those from local rivers. The primary production supported by all the external DIN inputs is determined to be 323–390mgCm−2d−1, in which SGD provide approximately 73.1% of total primary production. Our results reveals that SGD plays an important role in nutrient balance and may be responsible for the frequent outburst of red tides in Daya Bay. The present study provides baseline data for evaluating environmental effects in Daya Bay and similar coastal bay systems elsewhere.

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Short summary
Previous apparent age model usually neglects the effects of the key factors and results in the uncertainty of flushing time estimation for coastal waters. To enhance the accuracy of flushing time and submarine groundwater discharge (SGD), we present an improved model and then apply in Daya Bay, China. The nutrient inputs from SGD are compared with those from the local rivers and other external sources. The analysis indicates that SGD has an important influence on the ecological environment.
Previous apparent age model usually neglects the effects of the key factors and results in the...
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