ABSTRACT This paper presents a hybrid approach for stormwater runoff modelling and pollutant load estimation in a hilly catchment. The stormwater runoff hydrograph was simulated by developing a conceptual hybrid model (HM) using transfer function. Model parameters were estimated by non-linear optimization. The simulated runoff hydrographs showed an excellent match with the observed data. Next, a relationship was developed between runoff and pollutant load and the developed relationship was used for estimation of pollutant load. A novelty of this hybrid approach is that it could bring out a generic HM. By using the derived model, the pollutant load was successfully predicted from simulated runoff (R2 > 0.75) by considering rainfall as the only input. In addition, assessment, characterization and analysis of the first flush of urban runoff also form part of the study. The HM was tested and validated by applying it to 25 storm events monitored during two monsoon seasons in the Nainital Lake catchment (approx. 1900 m a.m.s.l.), India.

中文翻译：

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城市丘陵集水区径流建模和污染物负荷预测的混合方法

摘要 本文提出了一种混合方法，用于丘陵集水区的雨水径流建模和污染物负荷估计。通过使用传递函数开发概念混合模型 (HM) 来模拟雨水径流过程线。通过非线性优化估计模型参数。模拟的径流水位线与观测数据非常吻合。接下来，建立径流和污染物负荷之间的关系，并将建立的关系用于估计污染物负荷。这种混合方法的新颖之处在于它可以产生通用的 HM。通过使用导出的模型，通过将降雨作为唯一输入，从模拟径流 (R2 > 0.75) 成功预测了污染物负荷。此外，评估、对城市径流第一次冲刷的表征和分析也是研究的一部分。通过将 HM 应用于在印度奈尼塔尔湖集水区（大约 1900 米 amsl）的两个季风季节监测到的 25 个风暴事件，对其进行了测试和验证。