This research took the Chongqing main town as an example to study the
impact of seasonal floods in the upper reaches of the Yangtze River on the
city, and strategies to improve flood resilience in the river corridor area in
mountainous cities. The study first analyzed the water safety, water conflict,
and water opportunities in the upper reaches of the Yangtze River and in
the urban area of Chongqing to understand the risk of floods with different
triggers (transit flood, local storm flood) and how to reduce the risks. Then,
analyze and select the severity of flood influence in the river corridor area in
the Chongqing main town, and find out the areas which most vulnerable to
flood. Thus to carry out the design to improve flood resilience in these areas.
Through the analysis and comparison of two more extreme flood control
scenarios, the study puts forward a road map for the implementation of river
corridor flood resilience and the principles of flood resilience urban design
for the cities in the upper stream of Yangtze River. In the design experiment,
the road map and the design principles are used to implement flood resilience
design for the two most severe hazard areas selected in the previous analysis.
The results show that this method can not only enhance the flood resilience
of those areas, but could also bring ecological, social and economic
benefits. From the design results, in the current urban environment, the
hybrid infrastructure approach is suitable for flood resilience design in all
kinds of situations. And the percentage of green and blue facilities in hybrid
infrastructure depends on the amount of space that can be used as flood
treatment zone. In the future regional flood control design, the methodology
used in this study can be used to evaluate the severity of flood hazards in the
river corridor area of other upstream Yangtze River cities. And it could also
serve as a reference for flood resilience river corridor design.