Sub-theme
3. Building Resilience for Disaster Prevention and Mitigation
Topic
3-2. Development of flood control projects
Body
Based on the measured hydrological data and topographic data, the changes of the hydrological regime in the Guangdong-Hong Kong-Macao Greater Bay Area in the past 40 years was analyzed in this paper. The research finds that the main features of Greater Bay Area include the intensification of upstream flood regression, the significant uneven downcutting of riverbed in the river network area and the change of diverting ratio of important nodes, the degradation of estuary barrier sand, the continuous rise of sea level, frequent typhoons, and the record high extreme tide level. According to the common control idea of "flood, waterlogging and tide", a one - and two-dimensional combined tidal current model of the Pearl River Delta river network was adopted to study the layout of flood control (tide) projects in the Guangdong-Hong Kong-Macao Greater Bay Area. The results show that the combination of gate and dike was relatively superior in terms of technology and economy, and could better cope with the threat of excess flood (tide) in the Greater Bay Area, and improve the resilience of flood control (tide) reduction in the Greater Bay Area. Therefore, it is suggested that the Pearl River Delta should further strengthen the joint construction of sluice walls, and construct the flood discharge pattern of " the main stream of Xijiang River and the north Dongjiang River, supplemented by the tributary of Beijiang River and the south Dongjiang River", the tidal defense engineering layout of “the combination of sluice and dikes”, and the large-scale drainage project layout of " external drawdown, internal drainage, combined with sluice and pump". This study can provide reference for relevant departments to carry out flood control (tide) project construction in the Pearl River Basin, especially the current flood control planning revision and water network planning in the Pearl River Basin.