ارزیابی ژئوشیمیایی کیفیت آب‌های زیرزمینی دشت برازجان برای مصارف کشاورزی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 آموزشکده فنی و حرفه‌ای سما، دانشگاه آزاد اسلامی واحد شوشتر، شوشتر- ایران

2 دانشگاه شهید چمران اهواز

چکیده

     افزایش مصرف آب ناشی از افزایش جمعیت، باعث کاهش کیفی و کمی آب­های قابل استحصال شده است. با توجه به این وضعیت، شناخت کمی و کیفی منابع مناسب برای داشتن کشاورزی پایدار امری ضروری و اجتناب­ناپذیر به­نظر می­رسد. در این مطالعه به بررسی کیفیت آب­های زیرزمینی در مصارف کشاورزی دشت برازجان در شمال استان بوشهر پرداخته شده است. 21 نمونه آب زیرزمینی دشت در اردیبهشت سال 1391 از نظر غلظت یون­هایK+, Na+, Ca2+, Mg2+ Cl-, SO42-, HCO3- و NO3- مورد تجزیه و تحلیل قرار گرفت. غلظت یون­های کلر، سدیم و نیترات به دلیل اهمیت خاص با عیار­های استاندارد آب کشاورزی مقایسه شد. همچنین عواملی مانند کل مواد جامد محلول (TDS)، نسبت جذب سدیم (SAR)، شاخص نفوذپذیری (PI)، کربنات باقی­مانده (RC)، هدایت الکتریکی (EC) و شاخص کیفیت آب زیرزمینی (GQI) مورد ارزیابی قرار گرفت. نتایج بررسی­ها نشان داد که، کیفیت آب­های زیرزمینی دشت برازجان از لحاظ EC و کلرید وسدیم بیشتر از حد استاندارد آب کشاورزی می­باشد. با بررسی مکانی پارامترهای کیفی آب­های زیرزمینی محدوده مطالعه مشخص شد که آب­های زیرزمینی دشت مذکور برای مصارف کشاورزی از کیفیت متوسط برخوردار است. نقشه GQI بدست آمده مقدار این شاخص را بین 68 تا 82 درصد در منطقه نشان می­دهد، که بیانگر این مسئله است که شمال و مرکز دشت دارای آب­هایی با کیفیت متوسط و نیمه جنوبی دارای آب­هایی با کیفیت مناسب برای آبیاری
می­باشد.
 
 

کلیدواژه‌ها


عنوان مقاله [English]

Geochemical Evaluation of Groundwater Quality in Borazjan Plain for Agricultural Purposes

نویسندگان [English]

  • Zahra Sajadi Minaab 1
  • Seyed Massoud Yaghobi 2
چکیده [English]

Increased water consumption due to population growth, has a great impact on quality and quantity of water supply. Given this situation, the qualitative and quantitative identification of appropriate resources for a sustainable agriculture seems to be necessary and inevitable. In this study, ground water quality in agriculture Borazjan plain in the north of Bushehr is paid. 21 samples of groundwater plain of ion HCO3-, K+, Na+, Ca2 +, Mg2 +, Cl-, SO42-, and NO3- were analyzed. Density of sodium chloride and nitrate ions because of special importance were compared to grades of agricultural water standard. Furthermore the comparison involves parameters such as total dissolved solids (TDS), sodium adsorption ratio (SAR), permeability index (PI), carbonate residue (RC), Electrical conductivity (EC) of ground water quality index (GWQI) were evaluated ,the results stated that, ground water quality in lowland of Borazjan has more EC, sodium and chloride than limit agricultural water standard. Studying the location of underground water quality with respect to the parameters boundaries, it has been determined that underground water quality is average to use for agricultural purposes in the fields. Obtained GQI map shows a value between 68 to 82 percentages for this index, which indicates that the Water irrigation quality in North and Centre of Plains is average and the southern half of the plain has water with suitable quality for irrigation.
 

کلیدواژه‌ها [English]

  • Agriculture
  • Borazjan Plain
  • irrigation
  • Quality Index GQI
  • Water Quality
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