高密度建成区有限空间防洪排涝能力提升研究

Enhancing Flood Control and Drainage Capacity in Limited Spaces of High-density Built-up Area

成都市某高密度建成区河道防洪能力不达标、河道空间有限,导致上游壅水严重、片区内涝频发。为此,采用InfoWorks ICM软件构建片区模型,通过多方案水文计算和数值模拟分析,提出了“横向适度拓宽+纵向合理挖深+区域强排管理”相结合的系统工程措施,可使该河道的200年一遇洪水位降低0~3.45 m,减少强排泵站4座,消除内涝点位8个;此外,使河道壅水长度减少2.9 km,可缓解该片区的内涝,并将区域河道防洪标准提升至200年一遇。

The flood control capacity of a river in a high-density urban built-up area in Chengdu does not meet established standards,and the limited river space contributes to significant backwater upstream and recurrent waterlogging within the vicinity.In this paper,the InfoWorks ICM software was employed to develop a regional model.Through comprehensive hydrological calculations and numerical simulation analysis across multiple schemes,a system engineering approach was proposed that integrated moderate horizontal widening,reasonable vertical excavation,and regional pumping discharge management.This strategy had the potential to lower the river’s 200-year flood level by 0-3.45 meters,and resulted in the reduction of four pumping stations and the elimination of eight waterlogging points.Furthermore,the proposed scheme decreased the backwater length in the river by 2.9 kilometers,mitigated waterlogging issues in the region,and elevated the flood control standard of local waterways to a once-in-200-year.