Journal of Tropical Oceanography >
Study on flux of nitrogen and phosphorus across the interface of sediment-water and their diffusion areas in seawater at the aquaculture region of Daya Bay
Received date: 2013-09-25
Revised date: 2014-03-06
Online published: 2014-08-11
In order to better track the effect of marine culture in floating cage on water quality, the sediments of three representative sites in the aquaculture area of Daya Bay were sampled in October 2011. The water percentage, porosity percentage and density of sediments, and the vertical distributions of nitrogen and phosphorus in the interstitial water were measured in laboratory experiments. The release rate and yearly release quantity of nutrients at the sediment-water interface were calculated by means of Fick’s Law. Based on the theory of environmental hydraulics, a two-dimensional numerical model was applied to calculate diffusion regularities of the nutrients. The results show that, the yearly release contents of ammonia across the interface of sediment-water at Aotou, Shenshuigang and Hutoumen were 13.5, 5.2, 0.56 t·a-1, and that of dissolved reactive phosphorus were 0.34, 0.03, 0.02 t·a-1, respectively. The release fluxes were high enough to make the sediments close to the aquaculture area become a potential pollution source. The released nutrients from the sediment-water interface were affected by tidal flow, wind, and depth, and the diffusion region in seawater had a strip shape. The pollution belt was about 1 km in length and 50 m in width at each sampled site of the aquaculture area, which made eutrophication a potential risk to the water body.
CHENG Xiang-ju , GUO Zhen-ren , LIU Guo , LI Bin . Study on flux of nitrogen and phosphorus across the interface of sediment-water and their diffusion areas in seawater at the aquaculture region of Daya Bay[J]. Journal of Tropical Oceanography, 2014 , 33(4) : 77 -84 . DOI: 10.11978/j.issn.1009-5470.2014.04.010
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