大亚湾养殖区沉积物-水界面氮磷的释放通量及其在水体中的扩散迁移

doi:10.11978/j.issn.1009-5470.2014.04.010

Journal of Tropical Oceanography ›› 2014, Vol. 33 ›› Issue (4): 77-84.doi: 10.11978/j.issn.1009-5470.2014.04.010cstr: 32234.14.j.issn.1009-5470.2014.04.010

• Marine Environment Protection • Previous Articles

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

CHENG Xiang-ju¹, GUO Zhen-ren², LIU Guo³, LI Bin³

1. School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510640, China; 2. South China Institute of Environmental Sciences, Ministry of environmental protection, Guangzhou 510655, China; 3. School of Environmental and Civil Engineering, Chengdu University of Technology, Chengdu 610059, China

Received:2013-09-25 Revised:2014-03-06 Online:2014-08-11 Published:2014-08-11

Abstract

Abstract:

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.

Key words: aquaculture region of Daya bay, sediment-water interface, nitrogen and phosphorus, diffusion

CLC Number:

P734.4⁺4

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.

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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

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