Date

2022-8

Author

Yaqubi, Noor Ahmad

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This study aims to execute a flood management system and examine the appropriate structural measures to protect Dikmen town against the impacts of flooding. At first, hydrologic models using HEC-HMS tools are developed to simulate the rainfall-runoff processes in each of the three main ungauged sub-basins on the upstream side of the town. Next, the discharge hydrographs of the 5th December 2018 flood event are defined in the 2D HEC-RAS model, and the flood inundation maps of the study area are generated. The initial model indicates a 78% goodness-of-fit between the observed flood map and the model flood map. However, the model is then calibrated using Manning’s roughness coefficients until the goodness-of-fit ratio rises to 84%, and the relative error (RE) between the two maps declines from 4.2% to 1.5%. Furthermore, a technical impact analysis of the three mitigations measures (i.e., the concrete channel, the reservoirs, and the integration of both the channel and the reservoirs) are performed along with their cost analyses to determine the optimal solution in terms of reducing the risks of flooding with the optimum cost. The results indicate that the concrete channel with the lowest cost has the potential to protect against up to 100-year floods. However, for more extreme events, such as having a 500-year return period, the channel capacity cannot be sufficient to keep the flood water in the channel. Therefore, additional non-structural measures, such as increasing flood awareness and developing early flood warning systems, also need to be considered.

Subject Keywords

Hydraulic Modeling, Hydrologic Modeling, Flood Inundation Map, Dikmen, Northern Cyprus

URI

https://hdl.handle.net/11511/99407

Collections

Northern Cyprus Campus, Thesis