مقایسه شبکه پایش کروم آبخوان دشت بیرجند با استفاده از روش آنالیز مؤلفه‌های اصلی (PCA) و تئوری آنتروپی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشیار، گروه علوم و مهندسی آب، دانشکده کشاورزی، دانشگاه بیرجند، بیرجند، ایران

2 دانشجوی دکتری، گروه علوم و مهندسی آب، دانشکده کشاورزی، دانشگاه بیرجند، بیرجند، ایران

10.22034/jewe.2020.254396.1448

چکیده

به‌منظور مدیریت کارا و مؤثر منابع آب زیرزمینی، تعیین نقاط مهم جهت نمونه‌برداری به لحاظ کاهش حجم نمونه‌ها و صرفه‌جویی در هزینه و زمان بسیار مهم است. در این مطالعه با استفاده از روش آنالیز مؤلفه‌های اصلی و تئوری آنتروپی که روشی کاربردی در ارزیابی سامانه‌های پایش کیفی می‌باشد به طراحی شبکه پایش کروم آبخوان دشت بیرجند پرداخته شد. در این پژوهش، 25 چاه بهره‌برداری آبخوان دشت بیرجند با طول آماری yr 5 (1397-1393) موردبررسی قرار گرفت. در منطقه موردمطالعه میانگین سالانه پارامتر کروم (شش ظرفیتی) آب زیرزمینی با استفاده از تکنیک آنالیز مؤلفه‌های اصلی و تئوری آنتروپی موردبررسی قرار گرفت تا چاه‎های نمونه‎برداری مؤثر در آبخوان این دشت مشخص گردد. نتایج نشان داد که از بین 25 چاه موجود در منطقه موردمطالعه، می‌توان 15 چاه به‌عنوان چاه شاخص کروم آب زیرزمینی آبخوان دشت بیرجند معرفی نمود که از پراکندگی خوبی در منطقه برخوردار هستند که می‎تواند در کاهش هزینه‎های نمونه‎برداری نقش مهمی داشته باشد. همچنین جهت در نظر گرفتن عامل زمان در تغییرات این روش در دو دوره زمانی 2 و yr 3 ساله انجام شد. نتایج نشان داد که در دوره زمانی yr 2 (1394-1393) 19 چاه به‌عنوان چاه مؤثر انتخاب شدند که در دوره زمانی yr 3 (1397-1395) این تعداد به 17 چاه تقلیل پیدا کرد. تئوری آنتروپی نشان داد که کلیه چاه‌های موجود در منطقه از اهمیت یکسانی در طراحی شبکه پایش برخوردار هستند.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Comparision of Birjand Plain Aquifer Chromium Monitoring Network Using Principal Component Analysis (PCA) and Entropy Theory

نویسندگان [English]

  • Abbas Khashei 1
  • Ali Shahidi 1
  • Samira Rahnama 2
1 Assoc. Professor, Department of Water Science and Engineering, Faculty of Agriculture, University of Birjand, Birjand, Iran
2 2Ph.D. Scholar, Department of Water Science and Engineering, Faculty of Agriculture, University of Birjand, Birjand, Iran
چکیده [English]

In order to efficiently and effectively manage groundwater resources, it is very important to determine the important points for sampling in terms of reducing the sample size and saving cost and time. In this study, the main chrome monitoring network of Birjand plain aquifer was designed using principal component analysis method and entropy theory, which is a practical method in evaluating quality monitoring systems. For this purpose, 25 aquifers of Birjand plain with a statistical length of 5 yr (2015-2019) were surveyed. In the study area, the average annual chromium (hexavalent) of groundwater was studied using principal component analysis technique and entropy theory to determine the effective sampling wells in the aquifer of this plain. The results showed that out of 25 wells in the study area, 15 wells can be introduced as groundwater chromium index wells of Birjand plain aquifer having a good distribution in the area that can play an important role in reducing sampling costs. Moreover, in order to consider the time factor in the changes, this method was performed in two time periods of 2 and 3 yr. The results showed that in the period of 2 yr (2015-2016), 19 wells were selected as effective wells, while the number reduced to 17 wells in the period of 3 yr (2017-2019). Entropy theory showed that all wells in the region are of equal importance in monitoring network design.

کلیدواژه‌ها [English]

  • Birjand plain
  • Effective well
  • Groundwater
  • Principal component analysis
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