٢ ﺁﺏ ﻭ ﻓﺎﺿﻼﺏ ﺷﻤﺎﺭﻩ٢ ﺳﺎﻝ١٣٩٣ ﺗﺄﺛﻴﺮ ﻋﻮﺍﻣﻞ ﻣﺤﻴﻄﻲ ﺩﺭ ﺷﺒﻴﻪ ﺳﺎﺯﻱ ﻋﺪﺩﻱ ﮐﻠﻴﻔﺮﻡ ﺩﺭ ﺳﻴﺴﺘﻢ ﻫﺎﻱ ﺭﻭﺩﺧﺎﻧﻪ ﺍﻱ ﺳﻴﺎﻭﺵ ﻣﺤﻤﺪﻱ ۱ ﺳﻴﺪ ﻣﺤﻤﻮﺩ ﻛﺎﺷﻔﻲ ﭘﻮﺭ ۲ ﺩﺭﻳﺎﻓﺖ) ٢٢ / ٣ / ٩١ ﭘﺬﻳﺮﺵ٢١ / ١٠ / ٩١ ( ﭼﻜﻴﺪﻩ ﻣﺪﻝ ﺳﺎﺯﻱ ﺩﻳﻨﺎﻣﻴﮑﻲ ﮐﻠ ﻴﻔﺮﻡ ﮔﻮﺍﺭﺷﻲ، ﻣﺴﺌﻠﻪ ﺍﻱ ﺑﺴﻴﺎﺭ ﻣﻬﻢ ﺑﺮﺍﻱ ﻣﺪﻳﺮﺍﻥ ﻣﺤﻴﻂ ﺯﻳﺴﺖ ﺍﺳﺖ، ﺑﻪ ﻃﻮﺭﻱ ﮐﻪ ﻋـﺎﺭﻱ ﺑـﻮﺩﻥ ﺟﺮﻳـﺎﻥ ﺍﺯ ﺍﻳـﻦ ﺍﺭﮔﺎﻧﻴﺴﻢ، ﺩﻟﻴﻠﻲ ﺑﺮ ﭘﺎﮎ ﺑﻮﺩﻥ ﺁﺏ ﺍﺯ ﺁﻟﻮﺩﮔﻲ ﻫﺎﻱ ﺑﻴﻮﻟﻮﮊﻳﮑﻲ ﻭ ﻣﻮﺭﺩ ﺗﺄﻳﻴﺪ ﺍﺳﺘﺎﻧﺪﺍﺭﺩﻫﺎﻱ ﺟﻬﺎﻧﻲ ﺍﺳﺖ. ﺗﺨﻤﻴﻦ ﻧﺮﺥ ﺯﻭﺍﻝ ﮐﻠﻴﻔﺮﻡ ﮔﻮﺍﺭﺷـﻲ، ﺑﺨﺶ ﺍﺻﻠﻲ ﺷﺒﻴﻪ ﺳﺎﺯﻱ ﺑﺎﮐﺘﺮﻱ ﻫﺎﻱ ﺍﻳﻦ ﮐﻠﻴﻔﺮﻡ ﺍﺳﺖ. ﺩﺭ ﺑﺴﻴﺎﺭﻱ ﺍﺯ ﻣﺪﻝ ﻫﺎﻱ ﺗﺠﺎﺭﻱ، ﮐﺎﺭﺑﺮﺍﻥ ﺑﺮﺍﻱ ﺷﺒﻴﻪ ﺳﺎﺯﻱ ﺁﻟﻮﺩﮔﻲ ﻓﻘﻂ ﻣﻲ ﺗﻮﺍﻧﻨﺪ ﺍﺯ ﺿﺮﻳﺐ ﺛﺎﺑﺖ ﻧﺮﺥ ﺯﻭﺍﻝ ﺍﺳﺘﻔﺎﺩﻩ ﮐﻨﻨﺪ، ﺩﺭ ﺣﺎﻟﻲ ﮐﻪ ﻣﻘﺪﺍﺭ ﺿﺮﻳﺐ ﺯﻭﺍﻝ ﺑﻪ ﻋﻮﺍﻣﻞ ﻣﺤﻴﻄﻲ ﻫﻤﭽﻮﻥ ﺷﻮﺭﻱ، ﮐﺪﻭﺭﺕ، ﺩﻣﺎ ﻭpH ﻭﺍﺑﺴﺘﻪ ﺍﺳﺖ. ﺩﺭ ﺑﺎﺯﻩ ﻣﻼﺛﺎﻧﻲ) ﺍﻳﻦ ﺗﺤﻘﻴﻖ ﺭﻭﺩﺧﺎﻧﻪ ﮐﺎﺭﻭﻥ- ﺑﻪ( ﻓﺎﺭﺳﻴﺎﺕ ﻋﻨﻮﺍﻥ ﻣﻄﺎﻟﻌﻪ ﻣﻮﺭﺩﻱ ﺍﻧﺘﺨﺎﺏ ﺷﺪ ﻭ ﺍﺯ ﻣﺪﻝ ﻫﻴﺪﺭﻭﺩﻳﻨﺎﻣﻴﮑﻲ ﻭ ﮐﻴﻔﻲ ﻓﺎﺳﺘﺮ ﺑﺮﺍﻱ ﭘﻴﺪﺍ ﮐﺮﺩﻥ ﺭﺍﺑﻄﻪ ﺍﻱ ﺑﻴﻦ ﺿﺮﻳﺐ ﺯﻭﺍﻝ ﻭ ﭘﺎﺭﺍﻣﺘﺮﻫﺎﻱ ﺯﻳﺴﺖ) ﻣﺤﻴﻄﻲ ﺍﺳﺘﻔﺎﺩﻩ ﺷﺪ. ﻳﮏ ﺩﻭﺭﻩ ﺳﻪ ﺳﺎﻟﻪ۸۷ - ۸۵ ﺑﺮﺍﻱ ﻭﺍﺳﻨﺠﻲ ﻣﺪﻝ ﻭ ﺗﻌﻴﻴﻦ ﺭﻭﺍﺑﻂ( ) ﻭ ﻫﻤﭽﻨﻴﻦ ﻳﮏ ﺩﻭﺭﻩ ﻳﮏ ﺳﺎﻟﻪ۸۹ - ۸۸ ﺑﺮﺍﻱ ﺻﺤﺖ( ﺳﻨﺠﻲ ﻣﺪﻝ ﺩﺭ ﻧﻈﺮ ﮔﺮﻓﺘﻪ ﺷﺪ. ﻣﻘﺎﻳﺴﻪ ﻧﺘﺎﻳﺞ ﺍﻧﺪﺍﺯﻩ ﮔﻴﺮﻱ ﺷﺪﻩ ﻭ ﭘﻴﺶ ﺑﻴﻨـﻲ ﺷـﺪﻩ ﮐﻠﻴﻔﺮﻡ ﮔﻮﺍﺭﺷﻲ ﺩﺭ ﻣﺮﺍﺣﻞ ﻭﺍﺳﻨﺠﻲ ﻭ ﺻﺤﺖ ﺳﻨﺠﻲ ﻧﺸﺎﻥ ﺩﺍﺩ ﮐﻪ ﺍﺳﺘﻔﺎﺩﻩ ﺍﺯ ﺿﺮﻳﺐ ﺯﻭﺍﻝ ﻣﺘﻐﻴﺮ ﺑﻪﮐﺪﻭﺭﺕ ﻭ) ﻋﻨﻮﺍﻥ ﺗﺎﺑﻌﻲ ﺍﺯ ﻋﻮﺍﻣﻞ ﻣﺤﻴﻄﻲ ﻣﻲ( ﺩﻣﺎ ﺗﻮﺍﻧﺪ ﻣﻴﺰﺍﻥ ﺧﻄﺎﻱ ﻣﺪﻝ ﺭﺍ ﺩﺭ ﺍﻳﻦ ﻣﺮﺍﺣﻞ ﺑﻪ ﺗﺮﺗﻴﺐ۲۳ ﻭ۲۰ ﺩﺭﺻﺪ ﺩﺭ ﻣﻘﺎﻳﺴﻪ ﺑﺎ ﺍﺳـﺘﻔﺎﺩﻩ ﺍﺯ ﺿـﺮ)) ﻳﺐ ﺯﻭﺍﻝ ﺛﺎﺑـﺖ1/hr ( ۰۵ / ۰ ( ﮐﺎﻫﺶ ﺩﻫﺪ. ﻭﺍﮊﻩ ﻫﺎﻱ ﻛﻠﻴﺪﻱ: ﺭﻭﺩﺧﺎﻧﻪ ﮐﺎﺭﻭﻥ، ﻣﺪﻝ ﺳﺎﺯﻱ ﻋﺪﺩﻱ، ﮐﻠﻴﻔﺮﻡ ﮔﻮﺍﺭﺷﻲ، ﺿﺮﻳﺐ ﺯﻭﺍﻝ ﻣﺘﻐﻴﺮ Effect of Environmental Factors on Numerical Simulation of Coliform in Riverine Basins S. Mohammadi 1 S. M. Kashefipour 2 (Received June 11, 2012 Accepted Jan 10, 2013) Abstract Dynamic modelling of fecal coliform is now very important to the environmental managers, since keeping the concentrations of those pathogens around the accepted and universal standard values is one of the essential principles for healthy biological environment. One of the main parts of modelling FC is an accurate estimation of mortality rate. In many commercial numerical models, the users are only able to define a constant value for this coefficient for the whole simulation time. But the mortality rate or decay coefficient is highly dependent on the environmental conditions, such as temperature, turbidity, pH, EC, and etc. In this research Karoon River (Mollasani-Farsiat reach) is selected as a case study and the hydrodynamic and water quality numerical FASTER model was used to find the best relationship between the decay coefficient and environmental parameters. A 3 year period (2006-2009) was used for model calibration and developing of those relationships, and a 1 year ۱ - ﺩﺍﻧﺸﺠﻮﻱ ﻛﺎﺭﺷﻨﺎﺳﻲ ﺍﺭﺷﺪ ﮔﺮﻭﻩ ﺳﺎﺯﻩ ﻫﺎﻱ ﺁﺑﻲ، ﺩﺍﻧﺸﻜﺪﻩ ﻣﻬﻨﺪﺳﻲ ﻋﻠـﻮﻡ ﺁﺏ، (ﻧﻮﻳﺴــﻨﺪﻩ ﻣﺴــﺌﻮﻝ) ﺩﺍﻧﺸــﮕﺎﻩ ﺷــﻬﻴﺪ ﭼﻤــﺮﺍﻥ، ﺍﻫــﻮﺍﺯ۷۷۲۰۹۳۴۷ ) ۰۲۱ ( Siavash.mohammadi86@gmail.com ۲ - ﺍﺳﺘﺎﺩ، ﺩﺍﻧﺸﻜﺪﻩ ﻣﻬﻨﺪﺳﻲ ﻋﻠﻮﻡ ﺁﺏ، ﺩﺍﻧﺸﻜﺪﻩ ﺷﻬﻴﺪ ﭼﻤﺮﺍﻥ، ﺍﻫﻮﺍﺯ 1. M.Sc. Student of Hydraulic Structures, Dept. of Water Sciences Eng., Shahid Chamran University, Ahwaz (Corresponding Author) (+98 21) 77209347 Siavash.mohammadi86@gmail.com 2. Prof., Dept. of Water Sciences Eng., Shahid Chamran University, Ahwaz