Abstract

PEREZ, Jhonny I.; ESCOBAR, Jairo R.  and  FRAGOZO, Jose M.. 2D Hydraulic Flood Modeling in Data-Scarce Regions The Case of Ranchería River Delta, Riohacha-Colombia. Inf. tecnol. [online]. 2018, vol.29, n.4, pp.143-156. ISSN 0718-0764.  http://dx.doi.org/10.4067/S0718-07642018000400143.

A methodological approach which overcomes the lack of data available for 2D hydrodynamic modeling in deltaic floodplains is proposed. By digitizing the elevation data available in Google EarthTM and integrating them with river cross sections data surveyed on the field, plus additional topographic data available, a topographic point cloud was obtained. This was later interpolated in a Triangulated Irregular Network, and finally, a Digital Terrain Model was generated. A two-dimensional simulation (with IBER v2.3.2) for a flood event together with a solution alternative including a structural measure (levee) to protect a vulnerable community were carried out. Overflow occurred only in the final stretch of the riverbed. Therefore, it did not influence the urban area of the city of Riohacha. The levee would artificially avoid the flooding on the target area for protection but increasing the flood risk due to possible failure that would occur when a swelling river occurs. Based on results, the proposed methodology is useful for determining flood prone areas in deltaic zones and well supports decision making in data-scarce regions.

Keywords : 2D modeling; IBER; flood; digital terrain model.

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