基于溶解氧平衡法的南四湖生态需水量研究

Study on Water Demand for the Lake Ecosystems Based on Dissolved Oxygen Balance Method

提出一种基于水体溶解氧平衡法的湖泊生态需水量计算方法。首先计算大气复氧量和水生植物光合作用产氧量,然后计算水生生物呼吸耗氧量和底泥中有机污染物降解耗氧量,根据湖泊产氧量与耗氧量的平衡方程,确定不同水质条件下逐月水生生物需水量。以南四湖为例,计算了大气复氧量和水生植物光合作用的产氧量以及水生生物呼吸耗氧量和底泥中有机污染物降解耗氧量,在综合考虑逐月蒸发、渗漏需水量的基础上,依据溶解氧平衡方程,确定了湖泊逐月基本生态需水量。

This paper put forward a calculation method of the ecological water demand of lakes based on dissolved oxygen balance.Taking Nansi Lake as an example,it worked out the atmospheric reoxygenation,aquatic plant photosynthetic oxygen production,consumption for organic pollutants degradation of oxygen consumption and oxygen in the sediment in the aquatic respiration through the research of lake water dissolved oxygen in the source and destination.It is concluded that the Nansi Lake monthly aquatic water requirement under different water quality conditions according to the lake dissolved oxygen balance equation.The lake basic ecological water requirement is found by the number of monthly evaporation and leakage.