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ارزیابی وضعیت کیفی رودخانه کارون بر اساس شاخص کیفیت آب و استفاده از GIS | ||
| اکوهیدرولوژی | ||
| مقاله 18، دوره 4، شماره 1، فروردین 1396، صفحه 225-235 اصل مقاله (834.24 K) | ||
| نوع مقاله: پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22059/ije.2017.60905 | ||
| نویسندگان | ||
| مجتبی مروج1؛ ایمان کریمی راد1؛ کیومرث ابراهیمی* 2 | ||
| 1دانشجوی دکتری، دانشکدۀ مهندسی و فناوری کشاورزی، دانشگاه تهران | ||
| 2دانشیار، دانشکدۀ مهندسی و فناوری کشاورزی، دانشگاه تهران | ||
| چکیده | ||
| در سالهای اخیر کیفیت آب رودخانۀ کارون تحت تأثیر آلایندههای مختلفی از جمله زهآب کشاورزی و فاضلابهای شهری و صنعتی قرار داشته است. شاخص کیفیت آب و GIS، میتوانند به‌منظور پشتیبانی اقدامات مدیریتی در این رودخانه استفاده شوند و از قابلیت مدلهای سری زمانی نیز میتوان برای پیشبینی تغییرات کیفیت در آینده بهره برد. از این‌رو، هدف پژوهش حاضر ارزیابی کیفیت رودخانۀ کارون بر‌اساس شاخص کیفیت آب با استفاده از GIS و مدلسازی سری زمانی کیفیت آب است. در این پژوهش دادههای ماهانه شامل pH، دما، DO، BOD، TDS، فسفات، نیترات، کدورت و کالیفرم مدفوعی، طی سالهای 1386 تا 1391 تجزیه و تحلیل شد. همۀ شاخصهای محاسبه‌شده در طبقۀ متوسط قرار گرفتند که به‌معنای استفاده از آب رودخانه فقط با اعمال تصفیۀ پیشرفته است. توزیع مکانی‌ـ زمانی مقادیر شاخص کیفیت آب و معنادارنبودن روند تغییرات نشاندهندۀ به‌تعادل‌رسیدن آلایندههای ورودی و توان خودپالایی رودخانه است. نتایج مدلسازی مقادیر ضریب تبیین مناسب مدلها بین 69/0 تا 85/0 را نشان داد. همچنین شرایط انسانساز عامل غالب بر تغییرات کیفیت آب رودخانه شناخته شد. بر‌اساس این نتایج، کیفیت رودخانۀ کارون نسبت به گذشته اندکی افزایش یافته و با اتصال رودخانۀ دز، شاخص کیفیت آب به میزان نسبتاً زیادی کاهش مییابد که میتواند بیانگر پایینتربودن کیفیت آب رودخانۀ دز به‌دلیل ورود آلودگی به آن در پاییندست ایستگاه دزفول باشد و اقدامات کنترلی را در این رودخانه ایجاب میکند. | ||
| کلیدواژه‌ها | ||
| پهنه بندی؛ دارخوین؛ گتوند؛ ملاثانی؛ WQI | ||
| عنوان مقاله [English] | ||
| Evaluation of Karun River water quality status based on Water Quality Index and involving GIS environment | ||
| نویسندگان [English] | ||
| Mojtaba Moravej1؛ Iman Karimirad1؛ Kumars Ebrahimi2 | ||
| چکیده [English] | ||
| In recent years, the water quality of Karun River, IRAN, has been affected by different pollutant loads such as agricultural drainages, municipal and industrial wastewaters.Water Quality Index (WQI) and GIS as an efficient tool can be used to provide necessary support for decisions of the management actions in this river and also capability of time series models can be beneficial for forecasting future changes. Therefore this paper aims to evaluate the water quality of Karun River, according to WQI and using GIS and modelling water quality time series. In this research, monthly data including pH, temperature, DO, BOD, TDS, PO43-, NO3-, turbidity and fecal coliform were analyzed during years 2008 to 2013. All the calculated indices were classified in medium class that means the river water can be used only by applying advanced treatment. Spatio-temporal distribution of WQI values and non-significance of its fluctuations indicate balance between the pollutants input and self-purification capacity. Modeling revealed adequate coefficients of determination of selected autoregressive models that vary between 0.69 and 0.85. Also man-made conditions realized as the dominant factor affecting river water quality. According to the results, Karun river water quality has increased slightly comparing to the past and after Dez river junction, relatively high decrease in WQI occurred that can indicate Dez River’s lower quality because of entering pollutant loads in Dezful station downstream and calls for control measures on the river. | ||
| کلیدواژه‌ها [English] | ||
| zoning, Darkhwein, Gotvand, Molasani, WQI | ||
| مراجع | ||
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