پديد آورندگان :
ﮐﺮﯾﻤﯽ، ﺳﻬﺮاب داﻧﺸﮕﺎه ﺳﻤﻨﺎن - ﮔﺮوه ﻣﻬﻨﺪﺳﯽ ﻋﻤﺮان، ﺳﻤﻨﺎن، اﯾﺮان , ﮐﺮﻣﯽ، ﺣﺠﺖ داﻧﺸﮕﺎه ﺳﻤﻨﺎن - ﮔﺮوه ﻣﻬﻨﺪﺳﯽ ﻋﻤﺮان، ﺳﻤﻨﺎن، اﯾﺮان , ﺣﺴﯿﻨﯽ، ﺧﺴﺮو داﻧﺸﮕﺎه ﺳﻤﻨﺎن - ﮔﺮوه ﻣﻬﻨﺪﺳﯽ ﻋﻤﺮان، ﺳﻤﻨﺎن، اﯾﺮان , فرزين، سعيد داﻧﺸﮕﺎه ﺳﻤﻨﺎن - ﮔﺮوه ﻣﻬﻨﺪﺳﯽ ﻋﻤﺮان، ﺳﻤﻨﺎن، اﯾﺮان
چكيده فارسي :
از ﺟﻤﻠﻪ روشﻫﺎي ﮐﺎﻫﺶ ﺧﺴﺎرت ﺳﯿﻞ و ﮐﺎﻫﺶ ﺳﺮﻋﺖ ﺟﺮﯾﺎن در ﻧﺰدﯾﮑﯽ ﺳﺎﺣﻞ، اﺳﺘﻔﺎده از آﺑﺸﮑﻦﻫﺎ اﺳﺖ. در اﯾﻦ ﻣﻄﺎﻟﻌﻪ اﺑﺘﺪا اﻧﺘﻘﺎل رﺳﻮب و آﺑﺸﺴﺘﮕﯽ اﻃﺮاف آﺑﺸﮑﻦﻫﺎي ﺳﺮي در ﯾﮏ ﻣﺪل آزﻣﺎﯾﺸﮕﺎﻫﯽ ﺗﻮﺳﻂ ﻧﺮم اﻓﺰار Flow 3d ﺷﺒﯿﻪﺳﺎزي ﺷﺪه اﺳﺖ. ﺑﺎ ﺗﻮﺟﻪ ﺑﻪ ﻧﺘﺎﯾﺞ از اﯾﻦ ﻣﻘﺎﯾﺴﻪ، ﻣﯽﺗﻮان ﺗﻄﺎﺑﻖ ﺧﻮب ﺑﯿﻦ ﻧﺘﺎﯾﺞ ﻣﺪل ﻋﺪدي و آزﻣﺎﯾﺸﮕﺎﻫﯽ را ﻣﺸﺎﻫﺪه ﮐﺮد . ﺑﻪ ﻃﻮريﮐﻪ ﻣﯿﺰان ﺧﻄﺎي MAPE در اﻃﺮاف آﺑﺸﮑﻦ اول، ﺑﺮاي ﻧﺴﺒﺖﻫﺎي U/Ucr ﺑﺮاﺑﺮ 0/75 و 0/85 و 0/95 ﺑﻪ ﺗﺮﺗﯿﺐ ﺑﺮاﺑﺮ ﺑﺎ 9 درﺻﺪ و 13/79 درﺻﺪ و 14/10 درﺻﺪ ﻣﯽ ﺑﺎﺷﺪ ) Ucr ﺳﺮﻋﺖ ﺑﺤﺮاﻧﯽ(. ﺳﭙﺲ در ﺑﺎﻻدﺳﺖ ﮐﺎﻧﺎل از دو آﺑﺸﮑﻦ ﻣﺤﺎﻓﻆ ﺑﺎ ﻃﻮلﻫﺎي )10 و 20 ﺳﺎﻧﺘﯽ ﻣﺘﺮ(اﺳﺘﻔﺎده ﺷﺪه و اﺛﺮات اﯾﻦ دو آﺑﺸﮑﻦ ﺑﺮ روي آﺑﺸﺴﺘﮕﯽ اﻃﺮاف آﺑﺸﮑﻦﻫﺎي اﺻﻠﯽ ﻣﻮرد ﺑﺮرﺳﯽ ﻗﺮار ﮔﺮﻓﺘﻪ اﺳﺖ. ﻧﺘﺎﯾﺞ ﺣﺎﮐﯽ از آن اﺳﺖ ﮐﻪ ﺑﺎ اﻓﺰاﯾﺶ U/Ucr، ﺣﺪاﮐﺜﺮ ﻋﻤﻖ آﺑﺸﺴﺘﮕﯽ اﻃﺮاف آﺑﺸﮑﻦﻫﺎ اﻓﺰاﯾﺶ ﻣﯽﯾﺎﺑﺪ، ﺑﻪ ﻃﻮريﮐﻪ ﺑﺎ اﻓﺰاﯾﺶ 26 درصدي U/Ucr (از 75/0به 95/0)، افزايش حداكثر عمق آبشستگي اطراف آبشكنهاي اول، دوم و سوم به ترتيب برابر 51، 400و 116درﺻﺪ، ﻣﯽﺷﻮد. ﻫﻨﮕﺎﻣﯽ ﮐﻪ زوج آﺑﺸﮑﻦ ﻣﺤﺎﻓﻆ ﺑﺎ ﻃﻮلﻫﺎي ﻣﺘﻔﺎوت ﺑﻪ ﺻﻮرت ﻫﻤﺰﻣﺎن ﺑﻪ ﮐﺎر ﻣﯽروﻧﺪ، ﺑﺎﻋﺚ ﮐﺎﻫﺶ ﺷﺪﯾﺪ ﺷﺪت ﺑﺮﺧﻮرد ﺟﺮﯾﺎن ﺑﻪ دﯾﻮاره و دﻣﺎﻏﻪي آﺑﺸﮑﻦ اﺻﻠﯽ اول ﻣﯽﺷﻮﻧﺪ ﺑﻪ ﻫﻤﯿﻦ دﻟﯿﻞ اﺑﻌﺎد ﺣﻔﺮهي آﺑﺸﺴﺘﮕﯽ در اﻃﺮاف آﺑﺸﮑﻦﻫﺎي اﺻﻠﯽ ﮐﺎﻫﺶ ﯾﺎﻓﺘﻪ اﺳﺖ ﺑﻌﻼوه ﺣﺪاﮐﺜﺮ ﻋﻤﻖ آﺑﺸﺴﺘﮕﯽ اﻃﺮاف آﺑﺸﮑﻦﻫﺎي اﺻﻠﯽ اول و دوم و ﺳﻮم ﺑﻪ ﺗﺮﺗﯿﺐ ﻣﯿﺰان 42 ،78 و 79 درﺻﺪ ﮐﺎﻫﺶ ﭘﯿﺪا ﮐﺮدهاﻧﺪ ) U/Ucr ﺑﺮاﺑﺮ ﺑﺎ 0/85(.
چكيده لاتين :
Among the approaches to reduce flood damage is to reduce the flow
rate near the shore by spur dikes. The study first simulated the transfer
of sediment and scour around series spur dikes in an experimental
model using Flow 3d software. According to the comparison results,
one can observe a good match between the results of the numerical and
experimental models that the error rates of MAPE around the first spur
dike, for U/Ucr ratios were, 0.75, 0.85 and 0.95 and were 9%, 13.79%
and 14.10%, respectively. Then two protective spur dikes with various
lengths (10 and 20 cm) were used in canal upstream and the effects of
the presence of these two protective spur dikes simultaneously on the
scour around the main spur dike were examined. In modeling done,
increase in U/Ucr depth increases the maximum spur dike depth, so that
with increase in U/Ucr by 26% (from 0.75 to 0.95), the increase in the
maximum depth of the first spur was 51%, in the second spur dike 4
times, and in the third spur dike 116%. When the protective spur dike
couple with various lengths is used simultaneously, and then these two
protective spur dikes simultaneously drastically reduce the effect of the
flow intensity to the wall and nose of the main spur dike. Moreover,
the maximum depth of scour around the first, second and third main
spur dikes has decreased by 79, 42, and 78%, respectively (U/Ucr =
0.85).
