برآورد بار رسوب معلق و ارزیابی همگنی و ناهمگنی دبی و رسوب (مطالعۀ موردی: حوضۀ آبخیز کسیلیان، مازندران)

نوع مقاله : پژوهشی

نویسندگان

1 دانشجوی دکترای آبخیزداری، دانشکدۀ منابع طبیعی و علوم زمین، دانشگاه شهرکرد، شهرکرد، ایران

2 استادیار گروه مرتع و آبخیزداری، دانشکدۀ منابع طبیعی و علوم زمین، دانشگاه شهرکرد، شهرکرد، ایران

3 دانشیار گروه مرتع و آبخیزداری، دانشکدۀ کشاورزی و منابع طبیعی، دانشگاه محقق اردبیلی، اردبیل، ایران

چکیده

از آنجا ‏که بسیاری از حوضه‏های آبخیز کشور ایران ایستگاه رسوب‏سنجی ندارند، بین اندازه‏گیری‏ها و برآوردهای انجام‏شده اختلاف زیادی مشاهده می‏شود. به همین دلیل، ارزیابی استفاده از مدل‏های تجربی و روش‏های آماری برآورد رسوب معلق انتقال رودخانه‏ها ضروری به نظر می‏رسد. هدف از تحقیق حاضر، ارزیابی همگنی و ناهمگنی، روند تغییرات میزان دبی جریان و رسوب و مقایسۀ مناسب کارایی روش‏های برآورد بار رسوب معلق با استفاده از منحنی ‏سنجه در منطقۀ مطالعه‌شده است. با استفاده از نرم‏افزار ProUCL از طریق آزمون من‌ـ ‏کندال و پتیت به‌ترتیب به تغییرات روند و ارزیابی همگنی و ناهمگنی سری زمانی دبی آب و رسوب پرداخته شد. برای برآورد رسوب‏دهى معلق منحنی سنجۀ یک‏خطی، دوخطی و حد وسط دسته‏ها بررسی شده و بهترین روش از میان روش‏های یادشده از طریق معیار R2، NSE، RMSE و SD ارزیابی و انتخاب شد. نتایج نشان داد روش حد وسط دسته‏ها با بیشترین کارایی به عنوان روش مناسب برای این منطقه است. همچنین، نتایج حاصل از بررسی روند تغییرات دبی جریان و رسوب با استفاده از آزمون من‌‌ـ ‏کندال با سطح 5 درصد معناداری نشان داد روند به صورت نزولی بوده و نشان‌دهندۀ تطابق تغییرات دبی و رسوب در این منطقه است. در ارزیابی آزمون پتیت مشخص شد که سری زمانی گسسته در دبی رسوب ناهمگن و در دبی آب همگن است؛ بنابراین داشتن دانشی در ارتباط با همگنی و ناهمگنی دبی جریان و رسوب می‏تواند برای اقدامات حفاظتی و تعدیل آثار زیست‏محیطی مؤثر باشد.

کلیدواژه‌ها


عنوان مقاله [English]

Estimating the Suspended Sediment Load and Evaluating the Homogeneity and Heterogeneity of Water and Sediment (Case Study: Kasilian watershed, Mazandaran)

نویسندگان [English]

  • Akbar Norouzi 1
  • Mahdi Pajouhesh 2
  • Khodayar Abdollahi 2
  • Abazar Esmali Ouri 3
1 Ph.D. Candidate at the Shahrekord University, Faculty of Natural Resources and Earth Science, Department of Natural Engineering, Shahrekord Unversity, Shahrekord, Iran
2 Assistant Professor, Faculty of Natural Resources and Earth Science, Department of Range and Watershed Management, Shahrekord Unversity, Shahrekord, Iran
3 Associated Professor, Faculty of Agriculture and Natural Resources, Department of Range and Watershed Management, Mohaghegh-Ardabili Unversity,Ardabil, Iran
چکیده [English]

There is a significant difference between the observed and simulated suspended sediment yield with respect to many watersheds in Iran as this country does not have sediment stations. Due to station limitation, it is necessary to evaluate the experimental models and statistical methods for estimating the transfer rivers suspended sediment. The aim of this study is to evaluate homogeneity and heterogeneity, the trend of changes in discharge and sediment value and assesses a suitable comparison of suspended sediment load estimation methods efficiency using rating curves. The present study, the ProUCL software was used through the Kendall and Pitt test to evaluate trend changes and homogeneity and heterogeneity of time series relating to water and sediment discharge, respectively. To estimate suspended sediment a one-line, two-line, and mean-load rating curves were used. The performance of the methods was evaluated based on R2, NSE, RMSE and SD and the best method was selected. The finding of this study suggested that the mean-load method was selected as an appropriate method with the highest efficiency in the study area. Further, the trend changes of water and sediment discharges using the Kendall test showed that the trend is declining with a significance level of 5% and indicated that there are adaptations between water and sediment discharge changes. Pittet test revealed that the discrete time series in related to water and sediment discharges are homogeneous and heterogeneous, respectively. Therefore, having knowledge about the homogeneity and heterogeneity of water and sediment discharge can be effective in protection measures and environmental effects moderation.

کلیدواژه‌ها [English]

  • Pittet test
  • Man Kendall test
  • Suspended sedimentation
  • Sediment Rating Curve
  • and Sediment heterogeneity
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