The effect of cross-section position on flood inundation mapping / Norshahira Yusof

Floods are a natural occurrence of a combination of meteorology and hydrology. Hydrologists describe floods as a sudden increase in water production that causes a sudden water peak. In 2010 at Kuala Nerang, Kedah experienced a major flood. The goal of the study was to investigate the effect of the cross-section location on flood mapping. To achieve this goal, the objective of this study is to identify which DEM is suitable for flood mapping and analyze the influence of river crossing position on water surface height and stagnation area. The methodology using is in this process which is steady flow water surface profiles. This part of the modeling system is intended for the measurement of water surface profiles for steady, gradually varying flow. The system can manage either a complete network of channels or a single river. The steady flow portion is capable of modeling water flow surface profiles. In addition, RAS Mapping is a method for inundation mapping and includes the generation of surface water. This process can produce an overflow of water and can determine the height of the water. This can find out the height of the flood area. This study also shows that the use of Ifsar DTM data is more accurate than SRTM and the use of 300m cross-section is better than the cross-section curve. This can help improve flood mapping. This can help improve flood mapping. With the selection of accurate data can get the real flood. Cross-section selection also affects the accuracy of flood inundation mapping.