17:15 〜 18:45
[AHW18-P07] Study on the Application of Flood Mitigation and Adaptation in Urban and Rural Development Areas from a River Basin Perspective
キーワード：Urban and rural area, Flood mitigation and adaptation
The upstream, “Hutoupi Special District Plan”, the midstream, “Tainan Science Park Special District Plan”, and the downstream, “Annan District Urban Plan “, in the Yen-Shui River basin is selected as the study areas for operational flood mitigation and adaptation measures planning. From the simulation results and discussions of the basic geography situation after the implementation of the urban plan and the geography situation after the flood mitigation and adaption planning (water conservation measures and green infrastructure measures) under the 4 quantitative rainfall scenarios (extremely heavy rain: 200mm/24hr, 10-year return period rainfall in Yen-Shui river basin: 275mm/24hr, torrential rain: 350mm/24hr, and rainfall under climate change effect: 500mm/24hr).
The key factor affecting the flood mitigation effectiveness of the water conservation measures is the size of the operating area. In this study, if the operating area of a single urban planning division area is less than 50 hectares, the flood mitigation effectiveness will be less significant. Although the flood mitigation effectiveness is not significant, we can still use regulatory means to stipulate that a certain area needs to be reserved when urban renewal or building lot development is carried out, and water conservation measures are implemented to ensure that the base can conserve or store runoff and infiltrate rainwater ability. In this study, green infrastructure measures are planned and implement in the urban planning division area of the Yen-Shui River basin. Within the range of flood mitigation areas, in addition to agricultural areas, important objects that need to be protected, such as settlements and industrial areas. It has achieved substantial results in urban flood mitigation and adaption planning. The flood mitigation effectiveness of planning and implement green infrastructure measures in agricultural areas is higher than that of land used for park and green. The green infrastructure measures implemented near or in the vicinity or within the flood potential areas have better flood mitigation effectiveness. Therefore, it is recommended that when carrying out the spatial planning strategy of green infrastructure measures in the future, priority should be given to local flood detention in agricultural areas and setting them in the vicinity or within the flood potential areas, so as to fully exert the functions and effectiveness of flood mitigation and adaption of green infrastructure measures.
The key factor affecting the flood mitigation effectiveness of the water conservation measures is the size of the operating area. In this study, if the operating area of a single urban planning division area is less than 50 hectares, the flood mitigation effectiveness will be less significant. Although the flood mitigation effectiveness is not significant, we can still use regulatory means to stipulate that a certain area needs to be reserved when urban renewal or building lot development is carried out, and water conservation measures are implemented to ensure that the base can conserve or store runoff and infiltrate rainwater ability. In this study, green infrastructure measures are planned and implement in the urban planning division area of the Yen-Shui River basin. Within the range of flood mitigation areas, in addition to agricultural areas, important objects that need to be protected, such as settlements and industrial areas. It has achieved substantial results in urban flood mitigation and adaption planning. The flood mitigation effectiveness of planning and implement green infrastructure measures in agricultural areas is higher than that of land used for park and green. The green infrastructure measures implemented near or in the vicinity or within the flood potential areas have better flood mitigation effectiveness. Therefore, it is recommended that when carrying out the spatial planning strategy of green infrastructure measures in the future, priority should be given to local flood detention in agricultural areas and setting them in the vicinity or within the flood potential areas, so as to fully exert the functions and effectiveness of flood mitigation and adaption of green infrastructure measures.