Fariba Esfandiary Darabad, Masoud Rahimi, Khodadad Lotfy, Ebadi Elhameh,
Volume 20, Issue 57 (6-2020)
Abstract
So that the morphological and transverse changes of the Ghezelozan River have been evident in recent years and caused some problems. In this study, the detection of river side changes was carried out using satellite imagery of TM and OLI Landsat 5 and 8 in the period 1993 to 2013, during which an interval of 158 km from the Ghezelozan River, using the transect method evaluated. The channel duct was divided into 24 transects based on morphology and the process of change. The average migration rate of the Gezelozan River duct has been around 4.47 m / year over the past 20 years. The highest transhumance rate between 1993 and 2013, at 10.58 m / year, is related to transect 16, resulting in 52.51 hectares on the right bank of the river. Overall, the results show that during the period 1993 to 2013, close to 207.14 hectares was added to the right bank of the river and nearly 215.31 hectares from the right bank were decreased. Also, in this study, sinusoidal index was used to study the shape of the duct flat, based on which there are 15 sinusoidal transects.
Mr Arsalan Mehrvarz, Dr Agil Madadi, Dr Fariba Esfandyari, Mr Masoud Rahimi,
Volume 25, Issue 76 (3-2025)
Abstract
The morphology of river is one of the issues in geomorphology, engineering and river management. The marginal sections of the rivers have always been subject to the riverbed due to the special social and economic conditions. The Dare Ourt River is one of the permanent rivers in Ardabil province. In recent years, there have always been floods and changes in the morphology of the duct. In this study, the Dare Ourt river was analyzed using Rosegen model at levels one and two. The main data required for this study include: 1: 2000 river topographic maps, hydrometric data and boundary conditions (Ardabil Regional Water Authority). The HEC-RAS hydrodynamic model was also used to more accurately extract the main indices of the Rosegen model. The results showed that most parts of the river have a C6c type with alluvial substrate and other dominant types observed in the four studied ranges include B6c-E6b-F6-D types. Also, the results of field visits indicate a change in the type of river type D range 4 from type C to type F, which is difficult due to the fact that reconstruction and restoration of the river in type F is difficult. Recommended restrictions on the type F is prevented from turning the river.
