ارزيابي ذرات و بررسي رسوب ورودي به مخزن سد گتوند عليا با استفاده از نرم‌افزار CCHE2D

Estimate particles and Investigation of Tank’s Sediment in Olya Gotvand Dam by Using of CCHE2D software

ﭼﮑﯿﺪه ﭘﺪﯾﺪه رﺳﻮبﮔﺬاري در ﻣﺨﺎزن ﺳﺪﻫﺎ ﭘﺪﯾﺪهاي ﭘﯿﭽﯿﺪه ﺑﻮده و ﻋﺪم اﻃﻼﻋﺎت از ﻣﯿﺰان رﺳﻮب ورودي ﺑﻪ ﻣﺨﺰن ﺳﺪ و ﭘﯿﺶﺑﯿﻨﯽ روشﻫﺎي ﮐﻨﺘﺮل آن، ﻣﻮﺟﺐ ﮐﺎﻫﺶ ﻋﻤﺮ ﻣﻔﯿﺪ ﺳﺪ و اﺗﻼف ﺳﺮﻣﺎﯾﻪﻫﺎي ﻋﻈﯿﻢ ﻣﻠﯽ ﻣﯽﮔﺮدد. ﺑﻪ ﻣﻨﻈﻮر ﻣﺤﺎﺳﺒﻪ ﺑﺎر رﺳﻮب ورودي ﺑﻪ ﻣﺨﺰن ﺳﺪ ﮔﺘﻮﻧﺪ ﻋﻠﯿﺎ از ﻣﺪل راﯾﺎﻧﻪ اي CCHE2D ﮐﻪ ﺗﻮاﻧﺎﯾﯽ اﻧﺠﺎم ﻣﺤﺎﺳﺒﺎت رﺳﻮب را دارد اﺳﺘﻔﺎده ﺷﺪه اﺳﺖ. ﺑﺮاي آﻣﺎدهﺳﺎزي ﻣﺪل، از ﺣﺠﻢ زﯾﺎدي اﻃﻼﻋﺎت ﺷﺎﻣﻞ ﻣﺸﺨﺼﺎت ﻣﻘﺎﻃﻊ رودﺧﺎﻧﻪ در ﺑﺎﻻدﺳﺖ ﻣﺤﻞ اﺣﺪاث ﺳﺪ، آﻣﺎر ﻣﺮﺑﻮط ﺑﻪ دﺑﯽ روزاﻧﻪ رودﺧﺎﻧﻪ، ﺳﯿﻼبﻫﺎي ﺑﺎ دوره ﺑﺎزﮔﺸﺖﻫﺎي ﻣﺨﺘﻠﻒ، داﻧﻪﺑﻨﺪي ﻣﻮاد ﺑﺴﺘﺮ و دﯾﮕﺮ اﻃﻼﻋﺎت ﻣﻮرد ﻟﺰوم اﺳﺘﻔﺎده ﮔﺮدﯾﺪه اﺳﺖ. ﭘﺲ از ﮐﺎﻟﯿﺒﺮه ﮐﺮدن و اﺟﺮاي ﻧﺮم اﻓﺰار، ﺑﺎر رﺳﻮب ورودي ﺑﻪ ﻣﺨﺰن ﺳﺪ ﮔﺘﻮﻧﺪ ﻋﻠﯿﺎ ﺑﺮاﺑﺮ ﺑﺎ 89435ﮐﯿﻠﻮﮔﺮم ﺑﺮ ﻣﺘﺮ ﻣﮑﻌﺐ ﻣﺤﺎﺳﺒﻪ ﺷﺪ و ﺑﺎ ﺗﻮﺟﻪ ﺑﻪ ﻧﻮع ﺣﺎﻟﺖ ﺑﻬﺮهﺑﺮداري از ﻣﺨﺰن و وزن ﻣﺨﺼﻮص اﻧﺒﺎﺷﺘﻪﻫﺎ و ﺿﺮﯾﺐ ﺗﻠﻪاﻧﺪازي 90درﺻﺪ، ﺣﺠﻢ ﮐﻞ رﺳﻮب اﻧﺒﺎﺷﺘﻪ ﺷﺪه در ﻣﺨﺰن اﯾﻦ ﺳﺪ ﺑﺮاﺑﺮ ﺑﺎ 241ﻣﯿﻠﯿﻮن ﻣﺘﺮﻣﮑﻌﺐ ﺧﻮاﻫﺪ ﺑﻮد ﮐﻪ 7/23 درﺻ ﺪ ﺣﺠﻢ ﮐﻞ ﻣﺨﺰن ﺳﺪ را ﭘﺲ از 100ﺳﺎل ﺗﺸﮑﯿﻞ ﻣﯽ دﻫﺪ. ﻫﻤﭽﻨﯿﻦ ﻗﺴﻤﺖ اﻋﻈﻢ ﺑﺎر رﺳﻮﺑﯽ ورودي ﺑﻪ ﻣﺨﺰن ﺳﺪ ﮔﺘﻮﻧﺪ ﻋﻠﯿﺎ ذرات ﺳﯿﻠﺖ درﺷﺖ ﺑﺎ اﻧﺪازه 0/6250 - 0/310 ﻣﯿﻠﯽﻣﺘﺮ و ﻣﺎﺳﻪ ﺑﺴﯿﺎر رﯾﺰ ﺑﺎ ﻣﺤﺪوده اﻧﺪازه 0/125 - 0/0625 ﻣﯿﻠﯽﻣﺘﺮ را ﺗﺸﮑﯿﻞ ﻣﯽدﻫﺪ.

Sedimentation in the Tank’s dam is complicated phenomenon and If we don’t have any information about sediment transport and control method, It cause decrease duration of use dam and waste of huge popular wealth. Thesis goal is study on Estimate particles and Investigation and of tank`s sediment in olya Gotvand dam by using of CCHE2D software. To run this model use many base data like upstream river cross section specification, daily discharge statistics and air temperature, river discharge, varied reversion of flood water, river bed grain size and other need information’s. After insert all need data and run this model, the load sediment import in olia Gotvand dam`s tank is equal 89435 million cube meter per year and according to this result, after 100 year the sedimentation in order to trap coefficient 90 %, the whole sediment logs are jammed in the dam`s tank is equal 241 million cube meter and consequently this sediment to be formed 7.23% total volume of this dam`s tank. Most of Sediment Transport is kind of large silt with size 0.031-0.0625 mm and very small sand with size 0.0625-0.125.