Study On Urban Drainage Modeling Technology Based On Open Modeling Interface

Urban drainage system is an important infrastructure to a city. It is to collect and deliver the urban waste water and runoff cause by rainfall and snowmelt, which has the dual functionality of environmental protection and disaster migration. With the speedy development of the computation technology, internet technology, information and communication technology (ICT), opportunity and challenges had been given to the innovation and modernization for the management of the drainage system using new ICTs technology. Implementation and application of urban drainage modeling technology is the trend for municipal urban drainage development. It contributes to the modernization of the city's public utilities and thus to improve peoples living standards.Hydraulic modeling technology of the drainage network is the key to urban drainage modeling. Unsteady simulation technology is of great help to the design of the drainage network, operation and management of the network system and modeling of the water quantity and quality. It is regarded as the base for the design and management of the network in some developed countries. Storm water management model system (SWMM) development by US-EPA has its wide application in this area. Open Modeling Interface (OpenMI) technology development by European countries is a new standard for modeling linking among computational engine in water domain; it is well accepted by EU and USA scientists.Firstly, introduction on unsteady hydraulics modeling's application and development is given, specifically discussed 1D shallow water equation and it numerical solutions, followed by a summary on computer models in urban drainage areas. Then, it describes the open modeling interface technology including its source, development, history and objectives for assisting modelers in water engineering domain. Base on the SWMM's computational engine, migration of the SWMM engine towards OpenMI compliant is included in this paper. Some examples of using OpenMI to build integrated urban drainage models are later on summarized.Lastly, based on the modeling drainage system in Beijing Olympic center in ShijingShan district Beijing city, build sewer network model in SWMM, develop the OpenMI component for SWMM computational engine and use the migrated SWMM OpenMI component to link the Sewer model to a simple river model on the OpenMI platform to evaluate the flood risks in the area.