Vulnerability of East Iran Railway Against Floods (PAP015003)

Código

PAP015003

Autores

Manijeh Ghahroudi Tali

Tema

Flood risk management in mega cities

Resumo

Railways of Iran especially in arid regions has been damaged of flooding recently. Most of the flood damages were happened on the bridges railway. The main reason can be found in the context of changes in riverbed, sudden heavy rainfall, and coarse sediment. Dasht-e Lut and Dareh-Angir basins in the East of Iran are flat and covered by Salt land that the railway network goes through the north of the area. Length of Railway in the study area is 220.13 km and areas of catchments are 8641.27 Square kilometers. There are a lot of watercourses. Due to the abundance of coarse sediment and flatness, the streams are changing their bed in this area. Thus, more bridges are prone to flooding and runoff. The goal of this research is to assess the railway vulnerability of flood. Data sources were used in the research consisted of two parts: the first part of the data is international Database and the second is the data from 1:25000 topographic and elevation data of Aster images. They have been replaced to increase the spatial resolution of these data. Also 23 samples were taken of sediment under bridges. This research was conducted in two stages, in the first stage a Surface Tank Model, of a set Distributed hydrological modeling, was used in Integrated Flood Analysis System (IFAS) software. The model consists of a surface reservoir to surface precipitation, the average flow velocity and infiltration flow. The second phase Indian Council of Agriculture Research (I.C.A.R) model has been used to evaluate the results. The IFAS results showed that 70 percent of the railway between Robatposhtbadam to Khonj stations, Jandagh to Chadormaloo and Chahmohammadu and also part of Raml to Jandagh which the whole railway 220.13 kilometers faced to flooding and runoff.