ارزيابي كيفي و تهيه نقشه پتانسيل‌هاي خوردگي و رسوب‌گذاري آب زيرزميني مرودشت- خرامه

Qualitative assessment and mapping of corrosion and sedimentation potential of Marvdasht-Kharameh groundwater

ﺗﻌﯿﯿﻦ ﭘﺘﺎﻧﺴﯿﻞ ﺧﻮردﮔﯽ و رﺳﻮب ﮔﺬاري ﯾﮑﯽ از ﺑﺎ اﻫﻤﯿﺖﺗﺮﯾﻦ ﺟﻨﺒﻪﻫﺎي ﮐﯿﻔﯽ ﻣﻨﺎﺑﻊ آبﻫﺎي زﯾﺮزﻣﯿﻨﯽ در ﻣﺼﺎرف ﻣﺨﺘﻠﻒ ﻣﯽﺑﺎﺷﺪ. ﻟﺬا ﻫﺪف از اﯾﻦ ﭘﮋوﻫﺶ ﺗﻌﯿﯿﻦ ﭘﺘﺎﻧﺴﯿﻞﻫﺎي رﺳﻮب ﮔﺬاري و ﺧﻮردﮔﯽ ﺑﺎ اﺳﺘﻔﺎده از ﺷﺎﺧﺺﻫﺎي ﻻﻧﮋﻟﯿﺮ و راﯾﺰﻧﺮ و ﻣﻮﻟﻔﻪﻫﺎي آﻧﻬﺎ در آب زﯾﺮزﻣﯿﻨﯽ دﺷﺖ ﻣﺮودﺷﺖ- ﺧﺮاﻣﻪ اﺳﺖ. ﺑﺮاي اﯾﻦ ﻣﻨﻈﻮر از ﺗﻌﺪاد 49ﺣﻠﻘﻪ ﭼﺎه ﮐﺸﺎورزي در 5ﺳﺎل ﻧﻤﻮﻧﻪﺑﺮداري و ﻣﻮﻟﻔﻪﻫﺎي ﺳﺨﺘﯽﮐﻞ )TH(، ﮐﻞ ﺟﺎﻣﺪات ﻣﺤﻠﻮل )TDS(، ﻗﻠﯿﺎﺋﯿﺖ ﮐﻞ ) TA( و اﺳﯿﺪﯾﺘﻪ )pH( اﻧﺪازهﮔﯿﺮي ﺷﺪ. از روش زﻣﯿﻦآﻣﺎري ﮐﺮﯾﺠﯿﻨﮓ ﺳﺎده ﺑﺮاي ﭘﻬﻨﻪﺑﻨﺪي ﺷﺎﺧﺺ راﯾﺰﻧﺮ و ﻻﻧﮋﻟﯿﺮ و ﻣﻮﻟﻔﻪﻫﺎي آﻧﻬﺎ اﺳﺘﻔﺎده ﮔﺮدﯾﺪ. ﻧﺘﺎﯾﺞ ﻧﺸﺎن داد ﻣﺪل ﮐﺮوي ﺑﻬﺘﺮﯾﻦ ﺑﺮازش را ﺑﺮاي ﺷﺎﺧﺺﻫﺎي ﻻﻧﮋﻟﯿﺮ و راﯾﺰﻧﺮ و ﻣﻮﻟﻔﻪﻫﺎي آنﻫﺎ دارد. داﻣﻨﻪ ﺗﺄﺛﯿﺮ از 15752ﺗﺎ 32711ﻣﺘﺮ ﺑﺮاي ﻣﻮﻟﻔﻪﻫﺎ ﻣﺘﻐﯿﺮ ﺑﻮد. ﮐﻼس ﻫﻢﺑﺴﺘﮕﯽ ﻣﮑﺎﻧﯽ از ﺧﻮب ﺗﺎ ﻣﺘﻮﺳﻂ ﺗﻐﯿﯿﺮ داﺷﺖ. ﻣﯿﺎﻧﮕﯿﻦ ﺷﺎﺧﺺ ﻻﻧﮋﻟﯿﺮ 0/58ﺑﻮد ﮐﻪ ﭘﺘﺎﻧﺴﯿﻞ رﺳﻮبﮔﺬاري ﮐﻢ ﺗﺎ ﻣﺘﻮﺳﻂ را ﻧﺸﺎن داد. ﻣﯿﺎﻧﮕﯿﻦ ﺷﺎﺧﺺ راﯾﺰﻧﺮ 6/3 ﺑﻮد ﮐﻪ ﭘﺘﺎﻧﺴﯿﻞ ﺧﻮردﮔﯽ ﮐﻢ را در آﺑﺨﻮان دﺷﺖ ﻣﺮودﺷﺖ- ﺧﺮاﻣﻪ ﻧﺸﺎن ﻣﯽ دﻫﺪ. ﺑﺮ اﺳﺎس ﻧﻘﺸﻪﻫﺎي ﭘﻬﻨﻪﺑﻨﺪي در ﻗﺴﻤﺖﻫﺎي ﺷﻤﺎﻟﯽ ﻣﻨﻈﻘﻪ ﻣﻮﻟﻔﻪﻫﺎي THو TDSو ﺑﻪ دﻧﺒﺎل آﻧﻬﺎ ﺷﺎﺧﺺ ﻻﻧﮋﻟﯿﺮ ﺑﯿﺸﺘﺮﯾﻦ ﻣﻘﺪار را داﺷﺖ ﮐﻪ ﭘﺘﺎﻧﺴﯿﻞ رﺳﻮبﮔﺬاري ﻣﺘﻮﺳﻂ را ﻧﺸﺎن ﻣﯽدﻫﺪ. در اﯾﻦ ﻗﺴﻤﺖ ﺗﺄﺛﯿﺮ ﺳﺎزﻧﺪﻫﺎي ﮐﺮﺑﻨﺎﺗﯽ اﺣﺘﻤﺎﻻً ﻋﺎﻣﻞ اﻓﺰاﯾﺶ ﺷﺎﺧﺺ ﻻﻧﮋﻟﯿﺮ ارزﯾﺎﺑﯽ ﺷﺪ. ﺑﻪ ﻃﻮر ﮐﻠﯽ ، ﻣﻨﺎﺑﻊ آبﻫﺎي زﯾﺮزﻣﯿﻨﯽ ﻣﺮودﺷﺖ- ﺧﺮاﻣﻪ از ﻧﻈﺮ ﭘﺘﺎﻧﺴﯿﻞ ﻫﺎي ﺧﻮردﮔﯽ و رﺳﻮبﮔﺬاري ﮐﯿﻔﯿﺖ ﻣﺘﻮﺳﻄﯽ دارد.

Determining corrosion and sedimentation potentials is one of the most significant quality aspects of groundwater in different expenses. So, the aim of this study is to appoint corrosion and sedimentation potentials by applying Langelier and Ryznar indexes and their compilers in Marvdasht-Kharameh plain underground water. For this purpose, 49 wells of agriculture well were sampled in five years and compilers of total hardness (TH), total dissolved solubility (TDS), total alkalinity (TA) were measured. Simple kiringing statistical earth method was used for mapping of Rynzar and Langelier indexes and their compilers. The results demonstrated that spherical model is the best fitting for Langelier and Ryznar indexes and their compilers. The effect scope for variable compilers was from 15752 to 32711.local correlation class modified from good to intermediate quality. The average of Langelier index was 0.58 that displayed low sedimentation potential to intermediate. The average of Ryznar index was 6.3 which exhibited low corrosion potential in Marvdasht-Kharameh plain aquifer. Based on mapping plots, in the northern parts, TH and TDS compilers and consequently the Langelier index had the most quantity that it displayed intermediate sedimentation potential. Probably in the northern part, carbonate compositor’s effect was evaluated as an increasing factor .By regarding to sedimentation and corrosion potentials, Marvdasht-Kharameh underground water has entirely intermediate quality.