Volume 4 Issue 2
Jun.  2011
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Ni SU, Jin-zhou DU, Tao JI, Jing ZHANG. 2011: 226Ra and 228Ra tracer study on material transport in the east coast of Hainan Island, China: a case of nutrients. Water Science and Engineering, 4(2): 157-169. doi: 10.3882/j.issn.1674-2370.2011.02.004
Citation: Ni SU, Jin-zhou DU, Tao JI, Jing ZHANG. 2011: 226Ra and 228Ra tracer study on material transport in the east coast of Hainan Island, China: a case of nutrients. Water Science and Engineering, 4(2): 157-169. doi: 10.3882/j.issn.1674-2370.2011.02.004
shu

226Ra and 228Ra tracer study on material transport in the east coast of Hainan Island, China: a case of nutrients

doi: 10.3882/j.issn.1674-2370.2011.02.004

  • State Key Laboratory of Estuarine and Coastal Research, East China Normal University,                Shanghai 200062, P. R. China

Funds:  Major Science and Technology Program for Water Pollution Control and Treatment in China;Major Science and Technology Program for Water Pollution Control and Treatment in China
  • Received Date: 2010-08-14
  • Rev Recd Date: 2011-05-02
    Abstract
  • Material fluxes (e.g. nutrients) from coast to offshore play an important role in controlling the water quality in the concerned adjacent sea not only by the increase of nutrient concentration but by the change of nutrient structure. In the present work, naturally occurring isotopes (226Ra and 228Ra) had been measured by alpha spectrometry in Wenjiao/Wenchang and Wanquan river estuaries and adjacent sea water of the east coast of Hainan Island. The excess dissolved 226Ra and 228Ra activities were observed in comparison with the values expected from the conservative mixing of freshwater and seawater end-members in both estuaries. Using 1-Dimensional Diffusion model, the estimated horizontal eddy diffusion coefficients (Kh) derived from 228Ra activities away from its sources was 3.16?105 cm2 s-1. Furthermore, the corresponding nutrient fluxes into the coastal area were assessed. The results can provide useful information for the processes of mixing and exchange of coastal water as well as the transportation of dissoluble pollutants in this sea area.

     

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