针对季节性河流流量具有周期性变化的特点，采用季节性污水排放计划（SDP）的季节划分方法，提出季节性河流水环境容量计算方法。以渭河干流关中段为例，将一年划分为旱雨两季，利用一维水质模型计算8个季节划分方案和1个对照方案在50％、75％和90％保证率下的水环境容量。研究结果表明：在相同保证率下，分季节计算的渭河干流关中段COD和NH3－N环境容量分别是传统环境容量计算方法的1．17～1．59倍和1．25～1．79倍，表明分季节计算的河流水环境容量明显大于以年为单位计算的河流水环境容量。%According to the flow characteristics of seasonal rivers having periodic variation,using the seasonal division method (SDP),it put forward the seasonal river water environmental capacity calculation method. Taking the Shaanxi reach of Weihe River as an example,the year was divided into dry season and rainy season,by using the 1-D water quality model to calculate water environmental capacity of 8 seasonal schemes and 1 control scheme in 50%,75% and 90% guarantee rate. The results show that under the same guarantee rate,the calculated COD and NH3-N seasonal environmental capacity of Shaanxi reach of Weihe River are 1. 17-1. 59 and 1. 25-1. 79 times that of the tradi-tional environmental capacity calculation methods and show that the rivers'seasonal environmental capacity is obviously bigger than that of the environmental capacity calculated based on year.
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