[Home ] [Archive]   [ فارسی ]  
:: Main :: About :: Current Issue :: Archive :: Search :: Submit :: Contact ::
:: Volume 5, Issue 4 (6-2017) ::
ژئو کمی 2017, 5(4): 41-58 Back to browse issues page
Analysis of lateral migration rate of Aras River using Transect method from 1987-2016 years (from khoda Afarin dam to Mil Moghan dam)
Abstract:   (501 Views)
1. Introduction
Rivers through production, movement and storage of sediments are one of the most important factors that modifying the earth’s surface. Lateral migration of rivers has been always associated with the bank erosion of the streambed or channel wall due to turbulent flow condition of water. River Migration channel occurred in a corridor or region, so it in some cases creates the problems for whom living in this region. Many people lose their houses, farmland, infrastructure and even their livelihoods because of migration and erosion of the river channel. In this study, Aras River channel migration during the past 29 years (1987 to 2016) was evaluated using transects methods. This river have a great importance in relation to water supply in the northwestern parts of the country. Moreover, in the large distances, forms Iran boundary line with the countries of Armenia and Azerbaijan. Therefore, research on the lateral changes of river becomes necessary.
 
2. Methodology
Topographic maps with scale of 1: 50,000, digital elevation model (DEM) with 27 m resolution, and satellite imagery (Landsat 5 TM satellite sensor& Landsat 8 OLI satellite sensor) are most important materials in this research. Studied channel reach of Aras River for two time periods, 1987 and 2016 were extracted by processing satellite images. Then, channel based on morphology and changes trend was divided into 13 transects, and quantitative indicators were calculated for each transect. Moreover, the extent of the lost or added land area on both banks of the river were calculated with respect to changes in transects area.
3. Results and Discussion
Study of lateral migration of Aras River showing high change in late 29 years. The average of channel migration rate in the study reach of Aras River is about 4.73 meters per year, which is a significant value. According to the studies, meanders of the river channel are active, and the formation of new meanders, meanders migration as a result of erosion and create cutoff frequently occurs with a relatively high rate. By comparing the mean values of the central angle and rate of channel migration can be said, in transects that planform is the developed meandering river, the rate of channel migration is higher. But in a few transects where the river tends to be a straight pattern. In the study area, according to the past changes trend, channel changes have occurred due to three major reasons: (1) channel migration in the floodplain due to the erosion of concave banks of meander loops, (2) occur cutoffs through development and nearing the base of meanders, which its effects can be seen as an abandoned channel, and (3) occur avulsion in the parts of the river channel. In fact, large quantities and unusual migration rate in some transects related to the avulsion. Most likely, the avulsion caused by the river flooding, especially in the spring and disturbances due to the confluences.
 
4. Conclusion
In some cases, combined these factors associated with interventions variables such as effects of confluences has caused the channel movement is very significant, and the unusual. The results indicated that the average of channel-migration rates for the Aras River (Between two dams) was about 4.73 meters per year during the past 29 years. During the period from 1987 to 2016 as a result of due to channel-migration of river approximately 171.48 hectares of land were added to the Iran and in contrast at about 376.26 hectares has been inaccessible. It is suggested that more attention be accurately assess changes in trans-border rivers.
Keywords: River Morphology, Lateral migration, Transect Method, Aras River
Full-Text [PDF 1081 kb]   (163 Downloads)    
Type of Study: Research | Subject: Special
Received: 2017/06/19 | Accepted: 2017/06/19 | Published: 2017/06/19
References
1. Abate, M., Nyssen, J., Steenhuis, T. S., Moges, M. M., Tilahun, S. A., Enku, T., and Adgo, E., 2015, Morphological changes of Gumara River channel over 50 years, upper Blue Nile basin, Ethiopia. Journal of Hydrology, Vol. 525, pp.152-164.
2. Briaud, J.L., Chen, H., Change, K., Chung, Y, Park, N., Wang, W.P., 2007, Establish guidance for soil properties-based prediction of meander migration rate. Texas Transportation Institute.
3. Casado, A., Peiry, J., Cambo, A.M., 2016, Geomorphic and vegetation changes in a meandering dryland river regulated bu a large dam, Sauce Grand River, Argentina. Geomorphology, Vol. 268, pp.21-34.
4. Charlton, R, 2008, Fundamental of Fluvial Geomorphology. pp.1-234.
5. Dufour, S., Massimo, R., Hervé, P., Michalon, A., 2015, How do river dynamics and human influences affect the landscape pattern of fluvial corridors? Lessons from the Magra River, Central–Northern Italy. Journal of Landscape and Urban Planning, vol. 134, pp. 107–118.
6. Giardino, John R and Lee, Adam A., 2011, Rates of channel migration on the Brazos river. Submitted to the Texas Water Development Board. Department of Geology and Geophysics, Texas A and M University.
7. Heo, J., Duc, T.A., Cho, H.S., Choi, S.U., 2009, Characterization and prediction of meandering channel migration in the GIS environment: A case study of the Sabine River in the USA. Environmental Monitoring and Assessment. Vol. 152, Issue 1-4, pp. 155-165.
8. Hossain, M. A., Gan, T. Y., and Baki, A. B. M., 2013, Assessing morphological changes of the Ganges River using satellite images. Quaternary international, Vol. 304, pp. 142-155.
9. Lauer, J. Wesley., 2006, NCED Stream Restoration Toolbox, Channel plan form Statistics. National center for earth-surface dynamics.
10. Lewin, J., Macklin, M.G., Newson, M.D., 1988, Regime theory and environmental change irreconcilable concepts? In: White, W.R. Ed., International Conference on River Regime, Wiley: pp. 431-45, New York.
11. Magdaleno, F., and Y. J. A., Fernandez., 2011, Meander dynamics in a changing river corridor. Geomorphology, Vol. 130, pp. 197-207.
12. Watson.,C.C., Biedenharn, D.S., Scott, Stephen. H., 1999, Channel rehabilitation: processes, design, and implementation. U.S. Army Engineer, Engineer Research and Development Center. Xu, H., 2007, Extraction of urban built-up land features from Landsat imagery using a thematic-oriented index combination technique. Photogrammetric Engineering & Remote Sensing, Vol. 73, No. 12, PP. 1381-1391.
13. Zaharia, G., I, Gabriel, M., Lili., 2015, Using Pressure and Alteration Indicators to Assess River Morphological Quality: Case Study of the Prahova River (Romania). Journal of Water, Vol.7, pp. 2971-2989.
14. Tejeda, E. M., Zabalza, J., Rahman Kazi, S.A.G, Moreno, I.J., Vicente, S., Lehmann, A., Tague, C.L., Beniston M., 2014, Hydrological impacts of climate and land-use changes in a mountain watershed: uncertainty estimation based on model comparison, Journal of ECOHYDROLOGY,Vol.10, pp. 1 – 21.
15. Zhang, T., Xingnan, Z, Dazhong, X., Yangyang, L., 2014, An Analysis of Land Use Change Dynamics and Its Impacts on Hydrological Processes in the Jialing River Basin, Journal of Water, pp. 3758 – 3782.
Add your comments about this article
Your username or Email:

Write the security code in the box >



XML   Persian Abstract   Print


Download citation:
BibTeX | RIS | EndNote | Medlars | ProCite | Reference Manager | RefWorks
Send citation to:

Analysis of lateral migration rate of Aras River using Transect method from 1987-2016 years (from khoda Afarin dam to Mil Moghan dam). ژئو کمی. 2017; 5 (4) :41-58
URL: http://geomorphologyjournal.ir/article-1-759-en.html
Volume 5, Issue 4 (6-2017) Back to browse issues page
مجله پژوهش‌های ژئومورفولوژی کمّی Quantitative Geomorphological Researches
Persian site map - English site map - Created in 0.05 seconds with 810 queries by yektaweb 3509