Two Dimensional Hydrodynamic Modelling of the Dongting Lakes in Support of the Flood Forecasting and Options Analysis Systems of the Yangtze River Flood Control and Management Project

摘要

Yangtze River, Flood Forecasting, Web - based Systems, Dongting Lakes, Detention Basins, One dimensional, Two dimensional, hydraulic modelling. Abstract: As part of the Yangtze River Flood Control and Management Project (YRFCMP), a Decision Support System (DSS) has been established to assist decision makers at the Yangtze River Flood Control Headquarters (YRFCH) during a flood emergency. An overview of the project and it's achievements to date are presented in an accompanying paper at this conference, Betts et al. (2005 a) A significant physical component of the river system covered by this DSS is the hydraulically complex Dongting Lakes system. This lake system represents a significant challenge for flood prediction in a real time context. For this reason, advanced hydraulic analysis techniques have been utilised in an effort to gain a better understanding of the hydraulic behaviour of this complex lake system and it' s interaction with the Yangtze River. Investigations have been undertaken in two broad areas, these being detailed two -dimensional modelling of the hydraulics of the extensive lake systems, and detailed, two -dimensional modelling of the processes associated with the flooding of detention basins adjoining the lake systems. This paper provides a brief overview of the detailed investigations of the Dongting Lakes and their relationship to the overall Yangtze River System as part of the YRFCMP. A description of the modelling systems, their calibration and the subsequent use of results in the Flood Forecasting and Options Analysis Systems is also presented.