Modeling Flood Disasters: Issues Concerning Data for 2D Numerical Models

Abstract

Abstract. Flood disasters are one of the worst natural disasters and they occur almost daily. Correspondingly, city managers are nowadays increasingly investing in data collection and modelling activities. Typically, flows in pipes and channels have been modelled using a onedimensional (1D) approach. Also, if the flood flows on the ground are confined to streets and curbs, the use of 1D/1D modelling approach (a.k.a. as dual drainage concept) may be a feasible way forward. However, if the flows are two-dimensional with complex interactions taking place through surface/sub-surface links, then the required approach would be the socalled 1D/2D modelling approach. The ever-increasing power of computers is now allowing a 3D fluid dynamics analysis of overflow and manhole structures, and in time these may be coupled with 1D models that may be used in situations where flow characteristics require with higher dimensionality. With the use of 2D models, the importance of terrain data has become a growing issue. The current paper discusses some of the key modelling approaches and makes particular reference to the terrain data processing and collection which can either improve or deteriorate their predictive capability.

Highlighting the role of the model user and physical interpretation in urban flooding simulation

“…However, this kind of detailed information is also (usually) more expensive and more difficult to process. Abdullah et al (2017) compared many LiDAR filtering algorithms and found that, even if producing detailed maps, none of them is fully reliable in capturing some important urban features. According to Mishra et al (2022), there are some challenges related to the representation and description of urban landscapes for atmospheric, hydrologic, and hydraulic modelling.…”