ارزيابي اثر خشك سالي برEC و SAR در هفت ايستگاه هيدرومتري در مسير رودخانه دز

Impact evaluation of drought on EC and SAR in seven hydrometric stations along the Dez River

ﯾﮑﯽ از ﭘﯿﺎﻣﺪﻫﺎي ﺧﺸـﮏﺳـﺎﻟﯽ ﻓﺸـﺎر ﺑﺮ ﻣﻨﺎﺑﻊ آﺑﯽ اﺳـﺖ. در اﯾﻦ ﻣﻄﺎﻟﻌﻪ اﺛﺮ ﺧﺸـﮑﺴـﺎﻟﯽ ﺑﺮ EC و SARرودﺧﺎﻧﻪ دز ﻣﻮرد ﺑﺮرﺳـﯽ ﻗﺮار ﮔﺮﻓﺖ. ﺑﺪﯾﻦ ﻣﻨﻈﻮر ﻫﻔﺖ اﯾﺴـﺘﮕﺎه آﺑﺴـﻨﺠﯽ در ﻃﻮل ﻣﺴـﯿﺮ رودﺧﺎﻧﻪ اﻧﺘﺨﺎب و آﻣﺎر ده ﺳـﺎﻟﻪ ﮐﯿﻔﯽ آب )ﺳـﺎلﻫﺎي 83-93( از ﺳـﺎزﻣﺎن آب و ﺑﺮق ﺧﻮزﺳـﺘﺎن و آﻣﺎر ﻫﻮاﺷـﻨﺎﺳـﯽ از اﯾﺴـﺘﮕﺎهﻫﺎي ﺣﺴـﯿﻨﯿﻪ، دزﻓﻮل و ﺷـﻮش اﺧﺬ ﺷـﺪ. ﻧﺘﺎﯾﺞ ﻧﺸـﺎن داد ﺷـﺪﯾﺪﺗﺮﯾﻦ ﺧﺸـﮏﺳـﺎﻟﯽ در اﯾﺴـﺘﮕﺎهﻫﺎي ﺣﺴـﯿﻨﯿﻪ و دزﻓﻮل ﻣﺮﺑﻮط ﺑﻪ ﺳـﺎل 1387 و در اﯾﺴـﺘﮕﺎه ﺷـﻮش ﻣﺮﺑﻮط ﺑﻪ ﺳـﺎل 1390 ﻣﯽﺑﺎﺷـﺪ. در ﺳـﺎلﻫﺎي ﺷـﺎﺧﺺ ﺧﺸـﮑﺴـﺎﻟﯽ ﻧﺴـﺒﺖ ﺑﻪ ﻣﯿﺎﻧﮕﯿﻦ درازﻣﺪت در اﯾﺴـﺘﮕﺎهﻫﺎي ﺳـﭙﯿﺪ دﺷـﺖ ﺳـﺰار، ﺳـﭙﯿﺪ دﺷـﺖ زاز، ﺗﻨﮓ ﭘﻨﺞ ﺳـﺰار، ﺗﻨﮓ ﭘﻨﺞ ﺑﺨﺘﯿﺎري، دزﻓﻮل، ﺣﺮﻣﻠﻪ و ﺑﺎﻣﺪژ ﺑﻪ ﺗﺮﺗﯿﺐ 11/67 ،15/3 ،3/74، 22/16، 5/28 ،10/59 و 37/98 درﺻـﺪ اﻓﺰاﯾﺶ ﯾﺎﻓﺘﻪ اﺳـﺖ. ﻫﻤﭽﻨﯿﻦ در ﺑﯿﻦ ﻫﻔﺖ اﯾﺴـﺘﮕﺎه ﻣﻨﺘﺨﺐ ﺑﯿﺸﺘﺮﯾﻦ درﺻﺪ اﻓﺰاﯾﺶSAR در ﺳﺎلﻫﺎي ﺧﺸﮏ ﻣﺮﺑﻮط ﺑﻪ اﯾﺴﺘﮕﺎه دزﻓﻮل ﺑﺎ 50 درﺻﺪ ﻣﯽﺑﺎﺷﺪ.

In this study, the effects of drought on EC and SAR doses were investigated. Seven hydrometric stations were selected along the river and ten year qualitative water data (from 2004-2014) from Khuzestan Water and Power Organization and meteorological statistics. The results showed that the most severe droughts in Hosseiniyeh and Dezful stations took place in 2008 and at Shoosh Station in 2011. In the definite years, drought index to average of long term, in the sepid dasht e of Caesar, Sepid Dasht Zaz, Tang-e-5 Caesars, Tang-e-5 Bakhtiari, Dezful, harmaleh and Bamdej stations was 3.74, 15.3, 11.67, 22.16, 10.59, 5.28 and 37098 respectively. Also among the seven stations, the highest percentage of SAR in dry years was at Dezful station with 50%.