湖泊底泥释氮预测模型及释氮控制研究

双龙湖是浅水型城市湖泊,一度为重富营养化湖泊,经综合治理其外源污染得到有效控制后,内源污染可能成为湖泊营养物主要负荷。采用底泥释氮模拟试验方法,对双龙湖底泥释氮影响显著因子(温度、pH、溶解氧、水动力)进行了分析。经多元回归得到双龙湖底泥平均释氮强度模型r=12.931 0.103[T]-0.36[pH]-0.728[DO] 0.490[K];通过释氮模型可预测不同环境条件下释氮规律,采取适宜措施抑制氮释放。

Prediction Model and the Control of Nitrogen Releasing from Sediment of Lakes

Shuanglong lake is a shallow lake in the urban city and had been a serious typical eutrophic lake once.After external pollutes had been controlled through comprehensive treatment,the endogenous pollutes resulted from polluted sediment may become main nutritional loading in the lake.As for this,it is important to ascertain the releasing regularity of nitrogen,the restrict nutrient of the lake,in repairing and maintaining water quality of the lake,providing the scientific foundation for harnessing the endogenous pollutes of the lake and protecting the environment.The effects of marked environmental factors,including temperature,DO,pH and hydrodynamics,on nitrogen releasing were analyzed and the model of nitrogen releasing in sediment of Shuanglong lake was obtained: r=12.931 0.103[T]-0.36-0.728 0.490[K].According to the model,the nitrogen releasing in the sediment of Shuanglong lake under different conditions was estimated and appropriate harnessing methods were put forward to control it.