TY - JOUR ID - 48746 TI - Assessing the Effect of Floods and Impounding Reservoir of Karun 4 Dam on the Morphological Change of Armand River in the Past Decade (2005-2015) JO - Journal of Hydraulics JA - JHYD LA - en SN - 2345-4237 AU - Khastar Borujeni, Milad AU - Khodashenas, Saeeid Reza AU - Samadi, Hossein AU - Taheriyan, Elham AD - Ferdowsi university of Mashhad/ Water Engineering Department AD - Associate Professor, Water Engineering Department, Ferdowsi University AD - Associate Professor, Water Engineering Department, Shahrekord University AD - Expert of Water Resource Research Center (WRRC), Shahrekord University Y1 - 2017 PY - 2017 VL - 12 IS - 1 SP - 43 EP - 57 KW - Remote Sensing KW - Water index KW - Erosion and accretion KW - Flood plain DO - 10.30482/jhyd.2017.48746 N2 - Evaluating the changes in river morphology, as one the most important fields in river engineering, plays a vital role for rivers upstream of large dams. Increasing our knowledge and understanding of the river’s behavior could help us to mitigate and reduce the possible impacts of the changing river morphology to water structures and public infrastructure. Therefore, in this study morphological changes in the Armand River which originated from basin of the Northern Karun and finally entered into the Karun 4 Dam, have been discussed. In this study fourteen selected images of Landsat OLI and TM acquired from 2005 to 2015 mostly in summer were used. The riverbank migration patterns and the changes of width and sinuosity resulted from accretion/erosion processes for 10 years and two biggest floods in this time were also investigated. The results indicated that the bank line movement rate lead erosion (accretion) on the right and left bank as 15 (14), 10 (12) percentage of average river width, respectively. It was also found that changes of net area rate (ha/years) for right and left bank was 0.11 and 0.74, respectively. The results obtained from flood data showed that generally in both banks of the river the erosion area was more than accretion and right bank is more active than the left bank. The results also showed that, the branch of the river that reach as Karun4 reservoir had the most increase in sinuosity for all the years studied. These indicated that Karoun4 dam construction caused surprisingly increasing changes in the morphology of the River up to the 3.5 km upstream of the reservoir entrance section. UR - https://jhyd.iha.ir/article_48746.html L1 - https://jhyd.iha.ir/article_48746_e4f5d9d7cd8c5dd5e3a09a3750b183a4.pdf ER -