Journal of Flood Risk Management · 2018 · 54 citations · 24 references
Natural ResourcesCivil EngineeringHydrologyFlood Risk ManagementHydrologic ModelingUrban HydrologyFlood Inundation ModelingFlood Risk AssessmentHydraulic ModelingHydrological ModelingUrban Flood ManagementUrban Hydrologic ModelingFlash Flood Risk AssessmentFlood ModelingFlood RiskHydrodynamic ModellingSynthetic Unit HydrographTwo-dimensional Hydrodynamic ModelingUnit HydrographUnmanned Aerial Vehicle Imaging
The study assesses flash flood risk in the downstream part of Hastane Brook, an intermittent stream in Kirsehir, Turkey, whose natural bed has been lost to intense human interventions. Because past flood records are lacking, the authors aim to develop the model by leveraging high‑quality data. They construct a street‑by‑street 2‑D hydrodynamic model in HEC‑RAS 5.0, calibrating it with high‑resolution terrain and land‑use data derived from UAV imagery and estimating flood hydrographs using synthetic unit hydrograph methods in the absence of gauging stations. The resulting flood‑hazard maps reveal that unexpected floods can arise from this intermittent basin, underscoring the need for precautionary measures.
This study is an assessment of flash flood risk in the downstream part of an intermittent stream which lost its natural bed due to intense human interventions, with the example of Hastane Brook in the province of Kirsehir (Turkey). The effects of flooding events with high, medium, and low probability of occurrence are investigated on a street‐by‐street basis with a two‐dimensional (2D) hydrodynamic model constructed in HEC‐RAS 5.0 software. Due to the lack of records of past flood events required for model calibration, it is aimed to utilise high‐quality data as much as possible in model development. Therefore, to more accurately simulate the movement of water and thereby to advise adequate measures for reducing the most likely flood effects, the required high‐resolution terrain and land use data are produced by processing the aerial images acquired by the unmanned aerial vehicle (UAV) flights over the flood risk zone. The estimation of flood hydrographs is only based on the synthetic unit hydrograph methods due to the absence of representative stream gauging stations inside or near the region. The resultant flood hazard maps are cautionary in terms of demonstrating the effects of possible floods that are unexpected to come from such an intermittent stream basin.
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