River morphological changes analysis caused by Taleqan Dam counteraction –based on remote sensing time deferential data

Authors
M. sharifikia 1
S. Shayna 2
S. M. eftekhari 3
A. Karam 3
1 Tarbiat Modares University faculty member.
2 Tarbiat Modares University faculty member
3 University faculty member Khwarizmi
Abstract
Dam construction is a wide civil activity which appeared as main necessary infrastructure of development for Iranian planning managers. Because Iran is located in a dry and semi dry region and the necessity of need to water resources, the construction of many dams is justified in inappropriate areas. Dam construction creates some changes in the area, so being aware of morphological changes in both upstream and downstream area is the most important factor for regional management, Reducing damages to structures, infrastructure and reservoir dam. Because of this necessity, the present study is deal with extraction of morphological changes in Taleqan dam upstream as a result of dam construction, applying time deferential remotely sensing data. For this purpose, three set of aerial photos relate to years 1334, 1350, 1380 (before dam construction) is used for extraction of morphological changes. In the next step, panchromatic images (Cartosat-1 satellite) related to years 1388, 1390, 1394 (after dam consternation) are collected. The results show that nearly 58 percent of the study area has negative change in elevation (max 31.2 cm). Whereas the positive elevation changes at a rate of 1 cm to a maximum 12 meters have covered more limited areas (35% range) in the end of main river bed and dam back areas, which is mainly due to sediment deposition. The result of extracted longitudinal profiles before and after construction from DEMs show significance changes in river bed. Also, change in the profile from the U-close to the similar U-open state is appreciable. Another point is that erosion activity is changed from bed to lateral erosion, and the primary cutoffs are expanding. According to the results, due to base level positive change in this part of Shahrud River, it is raised the conditions for entering into the transformation stage. So in addition to destroying the marginal structures, the conditions for transferring of more sediments from the loose slopes adjacent to the dam reservoir is prepaired.

Keywords

Subjects

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The Journal of Spatial Planning and Geomatics
Volume 21, Issue 2
July 2017
Pages 243-263