شناسایی تغییرات ناگهانی و تدریجی پارامترهای کیفی آب در ایستگاه‌های پایین‌دست سد گتوندعلیا

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجو دکتری آبیاری و زهکشی، دانشکده مهندسی علوم آب، دانشگاه شهید چمران اهواز

2 استاد گروه آبیاری و زهکشی، دانشکده مهندسی علوم آب، دانشگاه شهید چمران اهواز

3 استادیار گروه آبیاری و زهکشی، دانشکده مهندسی علوم آب، دانشگاه شهید چمران اهواز

چکیده

در این مطالعه با استفاده از آزمون من-کندال، روند تغییرات پارامترهای کیفی آب رودخانه کارون در سه ایستگاه پایین‌دست سد گتوندعلیا بررسی و همچنین برای تعیین مقدار شیب خط روند پارامترهای کیفی، از آزمون تخمین­گر شیب سن استفاده شد. علاوه براین با استفاده از دو آزمون تعیین نقطه شکست پتیت و لامبارد نقطه یا نقاط شکست ناگهانی و تدریجی سری زمانی پارامترهای کیفی جریان رودخانه در ایستگاه‌های منتخب شناسایی شد. نتایج آزمون من-کندال نشان داد که در بازه زمانی سال‌های آبی 1364 تا 1395 تمامی پارامترها (به جز pH) از خود روند مثبت نشان دادند. قابل ذکر است که 80% از متغیرها دارای روند مثبت معنی‌دار بودند. نتایج آزمون شیب خط روند نیز نشان داد که در دوره آماری مورد مطالعه کیفیت آب رودخانه کارون در هر سه ایستگاه رو به کاهش بوده است. نتایج دو آزمون لامبارد و پتیت نشان داد که به‌ترتیب 76% و 96% از پارامترها دارای نقطه شکست بودند. همچنین آزمون لامبارد نشان داد که  به‌ترتیب 20 و 63 درصد از پارامترها یک تغییر ناگهانی و تدریجی را تجربه کردند. از جمله دلایلی که می‌توان برای علت وقوع نقطه شکست نام برد، تغییر غلظت پارامترها به‌دلیل پدیده‌های حدی از جمله خشکسالی‌های اواخر دهه 70 و اواسط دهه 80 است.

کلیدواژه‌ها


عنوان مقاله [English]

Detecting abrupt and gradual changes in water quality parameters at the downstream stations of Gotvand-Olia Dam

نویسندگان [English]

  • hossien rahmati 1
  • Saeed Boroomand 2
  • Zahra Izadpanah 3
  • Mohammad Albaji 3
1 PhD Candidate of Irrigation and Drainage Engineering, Faculty of Water Science Engineering, Shahid Chamran University of Ahvaz, Ahvaz
2 Professor, Department of Irrigation and Drainage Engineering, Faculty of Water Science Engineering, Shahid Chamran University of Ahvaz, Ahvaz
چکیده [English]

In this study, the trend of changes in water quality parameters of Karoon River was investigated at three downstream stations of Gotvand-Olia Dam using Mann-Kendall test. In addition, Theil-Sen test was employed to determine the slope of the trend line. Furthermore, two change point tests including Pettit and Lombard tests were used to detect the abrupt and gradual change point of quality parameters time series. The results of Man-Kendall test showed that apart from pH, all of the parameters were of a positive trend in the studied period 1985 to 2016. Notably, that 80% of the parameters had a significant positive trend. The results of the slope test showed that water quality in Karoon River has been decreasing in all the three stations. The results of Lombard and Pettit tests respectively showed that 76% and 96% of the parameters had a chance point. Moreover, the Lombard test detected that 20% and 63% of the parameters experienced abrupt and gradual changes, respectively. Hydrological conditions such as the droughts happened in the late 70's and the mid-80's can be mentioned as one of the reasons identified for the cause of the change point in the time series of parameters.

کلیدواژه‌ها [English]

  • Mann-Kendal Test
  • Pettit and Lombard change point tests
  • Karoon river
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