中文摘要：

为了给入河污染物总量控制以及明确水功能区限制纳污红线提供技术支持,本文基于一维稳态条件下的水质模型,建立了考虑取水口和支流的分段求和模型来计算河流纳污能力。该模型以排污口、取水口或支流入口为控制断面将功能区划分为若干河段,确定各河段的流速,逐段计算纳污能力。相对于传统纳污能力计算模型,模型在考虑了支流和取水的基础上,能更灵活地对应功能区水质目标等级在水环境质量标准限值范围内合理选择水质目标浓度,从而避免出现纳污能力过严格或过宽松的情况。将模型应用于渭河干流陕西段,考虑取水口和支流的模型计算结果为73 814.43 t a,相比于断首控制模型的36 159.96 t a和功能区段末模型的85 365.49 t a,考虑取水口和支流的模型计算结果更适中,同时模型可以得出任意两个控制断面之间的纳污能力;模型中考虑了取水口、支流及分段流速等因素,得到的纳污能力也更科学、合理,能为明确水功能区限制纳污红线及入河污染物总量控制提供技术支持。

英文摘要：

In order to provide technical support for total amount control of pollutants and for defining red lines of received-pollutant limits in water function areas,a stepwise summation model is built to calculate water environment capacity,which considers water intake and tributary based on one-dimensional water quality model.The water function area was divided into several reaches to calculate water environment capacity by the control section with sewage outlet,water intake or entrance of tributary.Comparing to the traditional model,this model could control the function area of water quality target neatly,and avoid water environment capacity too strict or too loose.The model was adopted to Shaanxi section of the Weihe River.The calculated results of water environment capacity by the new model,segment first control model and the section-end control model were 73814.43,36159.96 and 85365.49t/a,respectively.The results show that the new model is more modest and it could calculate water environment capacity between any two control sections.Because of considered intake,tributary and sectional velocity,water environment capacity is also more accurate and reasonable.The new model could provide technical support for the total amount control of pollutants and for defining the red lines of water functional areas.