Analysis of Diurnal Patterns for Single Service Nodal Flow in Wastewater Modeling

To apply the wastewater modeling techniques to hydraulic condition analysis in a sewage pipe network system,the diurnal patterns of nodal flow,as an important input condition,was analyzed in this paper. Combined with the practical experience and statistical theory,detailed analysis procedures and methods were provided,which included the selection of service area monitoring nodes,removal of singular point in monitoring flow series,the frequency distribution fitting and testing for dimensionless coefficients of flow variation and the uncertainty expression of diurnal variation patterns. With the Guangzhou case study,five types of diurnal patterns for single service node were proposed. Through contrast with the same types of research results in China and abroad,the suitability of analysis results had been verified.