ﭘﺎﯾﺶ ﺗﻐﯿﯿﺮات ﺑﺪﻧﮥ ﺳﺪ ﻃﺎﻟﻘﺎن ﺑﻪ روش ﺗﺪاﺧﻞﺳﻨﺠﯽ راداري

Monitoring of the changes in the Taleqan dam’s body by using InSAR

ﺑﺎ ﺗﻮﺟﻪ ﺑﻪ اﯾﻨﮑﻪ ﭘﺎﯾﺶ و ارزﯾﺎﺑﯽ ﺗﻐﯿﯿﺮات ﺑﺪﻧﮥ ﺳﺪﻫﺎي ﺧﺎﮐﯽ ﺑﺎ اﺳﺘﻔﺎده از روشﻫﺎي ﻧﻘﺸﻪﺑﺮداري زﻣﯿﻨﯽ وﻗﺖﮔﯿﺮ و ﭘﺮﻫﺰﯾﻨﻪ ا ﺳﺖ، ﻟﺬا ﺑﺎ ﺑﺮرﺳــﯽﻫﺎي ﺑﻪﻋﻤﻞ آﻣﺪه در ﻣﺸــﮑﻼت ﻣﺸــﺎﺑﻪ در ﺳــﻄﺢ دﻧﯿﺎ روش ﺗﺪاﺧﻞ ﺳــﻨﺠﯽ راداري ﺑﻪﻋﻨﻮان ﯾﮏ روش ﻧﻮﯾﻦ ﺟﻬﺖ ﺑﺮرﺳــﯽ ﺟﺎﺑﺠﺎﯾﯽ ﺑﺪﻧﮥ ﺳﺪ ﻣﻌﺮﻓﯽ ﺷﺪه اﺳﺖ. ﺑﺪﯾﻦ ﻣﻨﻈﻮر در اﯾﻦ ﺗﺤﻘﯿﻖ ﺑﺎ ﻫﺪف ﺑﺮرﺳﯽ ﺗﻐﯿﯿﺮات ﺑﺪﻧﮥ ﺳﺪ ﻃﺎﻟﻘﺎن از 68 ﺗﺼﻮﯾﺮ Sentinel1-A در ﺑﺎزة زﻣﺎﻧﯽ 2018- 2014 از ﻧﺮماﻓﺰارGMTSAR اﺳﺘﻔﺎده ﺷﺪ. ﻫﻤﭽﻨﯿﻦ ﺗﮑﻨﯿﮏ ﺗﺪاﺧﻞ ﺳﻨﺠﯽ راداري ﺑﻪ ﮐﻤﮏ روش ﻃﻮل ﺑﺎز ﮐﻮﺗﺎه1 ﺑﺮاي ﺑﻪدﺳﺖ آوردن ﺳﺮي زﻣﺎﻧﯽ ﺑﻪﮐﺎر ﮔﺮﻓﺘﻪ ﺷﺪ. ﻧﺘﺎﯾﺞ ﺳﺮي زﻣﺎﻧﯽ ﻧﺸﺎن داد ﮐﻪ ﺣﺪاﮐﺜﺮ ﻣﯿﺰان ﻧﺸﺴﺖ ﺳﺪ mm/y 3 در راﺳﺘﺎي دﯾﺪ ﺳــﻨﺠﻨﺪه ﻣﯽﺑﺎﺷــﺪ. ﺑﻪ ﻣﻨﻈﻮر ﺗﻮﺟﯿﻪ ﺗﻐﯿﯿﺮات ﺑﺪﻧﮥ ﺳــﺪ ﻃﺎﻟﻘﺎن ﺗﺤﻘﯿﻘﺎﺗﯽ ﺑﺮ روي رﯾﭗ رپ2 ﺑﺪﻧﮥ ﺳــﺪ اﻧﺠﺎم ﺷــﺪ. اﯾﻦ ﻧﺘﺎﯾﺞ ﻣﺘﺄﺛﺮ از ﻓﺮ ﺳﺎﯾﺶ و ﻫﻮازدﮔﯽ ﻣﯽﺑﺎ ﺷﺪ ﮐﻪ ﺑﻪ دﻟﯿﻞ ﺿﺮﯾﺐ ﻧﻔﻮذ ﻧﺎﻣﻄﻠﻮب و ﻣﻘﺎوﻣﺖ ﻧﺎﻣﻨﺎ ﺳﺐ در ﺳﻨﮓﻫﺎﯾﯽ ﮐﻪ داراي ﺳﺎﺧﺘﺎر آذرﯾﻦ ﺑﯿﺮوﻧﯽ و رﯾﻮﻟﯿﺘﯿﮑﯽ ﻣﯽﺑﺎﺷــﺪ، ﻣﻨﺠﺮ ﺷــﺪ ﺗﺎ اﯾﻦ ﻣﺼــﺎﻟﺢ ﺗﺤﺖ اﺛﺮات ﺟﻮي و دﻣﺎي ﻣﻨﻄﻘﻪ دﭼﺎر وارﻓﺘﮕﯽ و رﯾﺰش ﺷــﻮﻧﺪ ﮐﻪ ﻧﺘﺎﯾﺞ آن ﺑﻪﺻــﻮرت ﺟﺎﺑﺠﺎﯾﯽ در ﺳﻄﺢ ﭘﺎﯾﯿﻦ د ﺳﺖ ﺑﺮوز ﻧﻤﻮده ا ﺳﺖ. ﺑﺮرﺳﯽﻫﺎي ﺑﻪﻋﻤﻞ آﻣﺪه ﺑﯿﺎﻧﮕﺮ ﺗﻮاﻧﺎﯾﯽ روش ﺗﺪاﺧﻞﺳﻨﺠﯽ راداري در ﭘﺎﯾﺶ ﺳﺪﻫﺎي ﺧﺎﮐﯽ و ﺳﺎزهﻫﺎي ﺑﺎ اﻫﻤﯿﺖ ﻣﯽﺑﺎﺷﺪ ﮐﻪ اﻃﻼﻋﺎت آن ﻧﻘﺶ ﺑﻪﺳﺰاﯾﯽ در ﺗﺤﻠﯿﻞ رﻓﺘﺎر ﺳﺪﻫﺎ و ﺗﮑﻤﯿﻞ اﻧﺪازهﮔﯿﺮيﻫﺎي اﺑﺰار دﻗﯿﻖ ﺧﻮاﻫﺪ داﺷﺖ

Given the time/cost inefficient nature of land mapping for monitoring of the changes in the earth dams’ body across the world, the Radar Interferometry is introduced here as a modern alternative method. In this study, to investigate the changes in the Taleqan dam’s body, we employed the GMTSAR software and processed 68 Sentinell- A images taken in the time period of 2014-2018. Additionally, utilizing the radar interferometry in the short range, the time series was determined. The time series results implied that the maximum dam subsidence is 3 mm/y along the line of sight. To justify the changes in the Taleqan dam’s body, some studies were carried out on the rip rap of the dam’s body. The obtained results implied that the changes have been caused by erosion and weathering. Due to undesired diffusion coefficient and low resistance of the stones with external volcanic and reolithic structure, such material collapsed under the influence of atmospheric and temperature factors, leading to displacement in the downstream. The performed investigations implied capability of the radar interferometry in monitoring of the earth dams and critical structures and providing information that can play a vital role in analysis of the dams’ behavior and completion of the precise tools measurements.