贡湖生态修复区水质净化模拟与净化能力

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Abstract Using 3D water quality model, we simulated the growth of algae and the growth and the distribution of submerged macrophytes (Myriophyllum spicatum L., Potamogeton crispus, Vallisneria natans) and compared the effect of water purification of nutrients in Gonghu ecological restoration area in spring and summer, aiming at further quantitatively revealing the important role of submerged macrophytes in the purification of eutrophic water bodies. The results showed that:The class IV water attainment rate of the ecological area discharge in summer (July~September) is higher than that in spring (March-May). In spring, the algae grow fast with the nitrogen and phosphorus nutrients inflowing, which can result in a higher concentration of chlorophyll a. However, a large amount of submerged macrophytes can complete with algae for nutrients, thereby inhibiting algal growth. Considering the follow-up effect of nutrients inflowing, the average dilution and purification efficiency of total nitrogen and total phosphorus in Gonghu ecological restoration area were 74.76% and 71.00% respectively in 180days when the nutrients inflowed in spring, and 73.20% and 64.65% when the nutrients inflowed in summer. The estimation results of the maximum purifying capacity can provide a reference for strengthening the management of ecological restoration area and ensuring the water quality of the lake.

Key words： 3D water quality model submerged macrophyte simulation nutrient purifying capacity

Received: 18 September 2017

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	SHI Qian-yun
	QIAN Xin
	GAO Hai-long
	LI Hui-ming

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SHI Qian-yun,QIAN Xin,GAO Hai-long等. Numerical simulation of water purification and estimation of purifying capacity in Gonghu ecological restoration area[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(5): 1878-1885.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I5/1878

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