Flood risk due to dam break : a case study in Hari-Rud River, Afghanistan | |
| Author | Karimi, Hamid |
| Call Number | AIT Thesis no.WM-17-01 |
| Subject(s) | Flood damage--Risk assessment--Afghanistan Dam failures--Afghanistan |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Water Engineering and Management |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. WM-17-01 |
| Abstract | Flood occurs frequently in most parts of the world , which is inundates villages and urban areas. T his research study focusses assessment of flood risk due to dam failure through the generating of inundation map in the flood plain area where data is to limited in Afghanistan. This research is one of kinds to investigate a case study located in Herat river basin, Afghanistan. Hari - Rud River basin is mountainous in the upstream portion and low land in the downstream . There are three dams in Hari - Rud River basin , which located in different districts in eastern of Herat city . Kowgan dam and Pashdan dam are under construction and Salma dam (Officially the Afghan - India Friendship Dam) is another one that it was opened on 4 June 2016. Watershed of Hari - Rud River basin with accurate stream networks could not delineate from downloaded 90 m Digital Elevation Map (DEM) that include contour lines, point elevations, stream networks and river survey map of Hari - Rud River. The elevation data of contour lines and point elevations are digitalizing from topographic map. All data is combining in Arc GIS 10.4.1 to generating inundation map for the Hari - Rud River area downstream portion from Salma dam to near border line between Afghanistan and Iran. Initially, HEC_RAS model was applied in order to check the implementation and performance the model into the Hari - Rud River. The hydraulic parameters of Hari - Rud River are cross - section s , inflow discharge from upstream to Hari - Rud River and also to Salma d am, lateral flow discharge in along the Hari - Rud River and outflow discharge at the downstream that they import to the HEC - RAS model and run the model to release the results for calibration, which are using to compute maximum discharge in Hari - Rud River. Moreover, within this study, Salma dam has been checked for overtopping using one dimensional and two dimensional analysis HEC_RAS model and numerical equations are used for estimate of dam breach parameters for Hari - Rud River . The inflow of Salma reservoir assumed more than maximum capacity of Salma dam to estimate the dam breach due to overtopping. The spillway has in adequate capacity for this estimation. Finally, t he HEC_RAS model process was develop ed in unsteady flow analysis. The overall results of the study showed that maximum discharge due to Salma dam breach outflow released to the downstream of Salma dam, which is almost 200 kilometers from Salma dam to boundary and estimate d the flow depth and water surface profile due to created inundation map of Hari - Rud River basin , especially in Herat city area . In conclusion, this research suggests that Flood risk map should be developed through the Hari - Rud River basin with more accuracy and detail and further study the effects of flood control structures such as flood pass channel. In addition, the hydrological load on dam can be decrease by increasing the capacity of spillways, increasing the crest high and build the diverting flood structures . Developing supporting system, which is can be an important policy to safe people at flooding time. |
| Year | 2017 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. WM-17-01 |
| Type | Thesis |
| School | School of Engineering and Technology |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Water Engineering and Management (WM) |
| Chairperson(s) | Duc Hoang Nguyen |
| Examination Committee(s) | Shrestha, Sangam;Sarawut Ninsawat |
| Scholarship Donor(s) | AFG Western Basin Water Resources Management Project |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 2017 |