东张水库氮磷内源负荷定量分析

根据物质平衡原理,通过建立氮磷物质内源负荷与其出入库量及水体氮磷储存量间的定量关系,对水库氮磷内源负荷进行定量分析,揭示水体中氮磷内源负荷的时间分布规律,并以福建省东张水库为例,阐述如何根据水库实测的水质和水文统计数据推算水库逐月氮磷内源负荷的具体做法和步骤。研究表明,东张水库中氮磷元素的内源负荷具有明显的季节分布规律,内源负荷大小与水体底层溶解氧的含量具有一定的相关性。1～4月水体底层富氧,氮的内源输入大于输出,内源负荷呈正值,其他月份呈负值。对于磷,7、8月水体底层厌氧,内源磷的输入大于输出,内源磷负荷呈正值,其它月份呈负值。这一方法只要在具备足够精度和系列的污染物出入库资料、水体污染物储存量监测资料以及相关水文资料的情况下,具有较高的计算精度。

The Quantitative Analysis Method of Endogenous Load of Nitrogen and Phosphorus in Dongzhang Reservoirs

Based on the material balance theory,the quantitative relation has been established among substance endogenous load of nitrogen and phosphorus,their quantity of input and output of the reservoir,and the storage quantity in the water body.Take Dongzhang Reservoir of Fujian Province as an example,the quantitative analysis of the endogenous load of nitrogen and phosphorus in a reservoir was carried out,and its temporal distribution law was revealed.Furthermore,this paper expounds the method and procedure of how to reckon the endogenous load of nitrogen and phosphorus in the reservoir month by month according to the surveyed statistical data of water quality and hydrology.The research tells us that the distribution of endogenous load of nitrogen and phosphorus is subject to seasonal change and the level of endogenous load is somewhat concerned with dissolved oxygen in the water bottom.From January to April,it is oxygen-enriched in the water bottom,therefore,the input of endogenous of nitrogen outweighs the output and the load appears positive;in other months,it appears negative.In July and August,it is anaerobic in the water bottom,therefore,the input of endogenous phosphorus of outweighs the output and the load appears positive:in other months,it appears negative.This approach of analysis proves to be quite accurate with abundant and precise data on the input and output of pollutants,the inspection information of the accumulation of water pollutants and other concerned hydrologic information.