مدل سازی پیشی بینی میزان رسوب رودخانه قلعه رودخان با استفاده از شبکه عصبی LSTM
محورهای موضوعی : رسوبمحبوبه شادابی بجند 1 , ابراهیم امیری 2
1 - دانشجوی دکتری گروه مهندسی آب، واحد لاهیجان، دانشگاه آزاد اسلامی، لاهیجان، ایران. *(مسوول مکاتبات)
2 - استاد گروه مهندسی آب، واحد لاهیجان، دانشگاه آزاد اسلامی، لاهیجان، ایران.
کلید واژه: استان گیلان, رسوب لحظه ای, رودخانه قلعه رودخان, شبکههای عصبی بازگشتی, LSTM.,
چکیده مقاله :
زمینه و هدف: برآورد مناسب از میزان رسوب جاری شده در رودخانهها به عنوان مبنای داده¬ای برای بسیاری از طرحها و فرآیندهای مهندسی رودخانه دارای اهمیت است. رودخانه قلعه رودخان یکی از حوزه¬های آبی بسیار مهم در غرب استان گیلان می باشد. رودخانه قلعه رودخان از دو شاخه (حیدرآلات) و (نظر آلات) تشکیل شده است. از همین رو، هدف از انجام این پژوهش، مدل-سازی پیشی بینی میزان رسوب رودخانه قلعه رودخان با استفاده از شبکه عصبی حافظه طولانی کوتاه مدت (LSTM) است. روش بررسی: در این تحقیق از آمار دبی ـ رسوب ثبت شده مربوط به دوره آماری سال 1381 تا 1395 استفاده شده است. این آمار شامل دبی لحظه ای روزانه به مترمکعب بر ثانیه و رسوب روزانه لحظه ای به تن در روز است که همزمان اندازه گیری شده اند. متغیرهای تحت بررسی در مدلسازی پیش بینی مستلزم ايجاد يک شبکه عصبي مصنوعي، وجود يک سري داده، به منظور مدلسازي در اين شبکه مي باشد. یافته ها: دقت پیش بینی های انجام شده با سه معیار خطا بررسی شد. سه معیار مورد بررسی به ترتیب AFE، FFE و n-AFE هستند. بحث و نتیجهگیری: نتایج به دست آمده نشان داد که از میان معیارهای مورد بررسی معیار FFE همبستگی میان خروجی مدل و داده¬های اندازه¬گیری شده رسوب مناسب می باشد. در نتیجه مدل LSTM دارای دقت مناسب برای پیش بینی مقدار رسوب دو رودخانه قلعه رودخان می باشد.
Background and Objective: Proper estimation of the amount of sediment flowing in rivers is important as a data base for many river engineering designs and processes. Qaleh Rudkhan River is one of the most important water basins in the west of Gilan province. The most important branches of the basin are two branches named Gasht Rudkhan and Ghaleh Rudkhan. The river (Qaleh Rudkhan) is made up of two branches (Heydaralat) and (Nazaralat). Therefore, the purpose of this study was to model the prediction of sediment rate in Qaleh Rudkhan River using long short-term memory neural network (LSTM). Material and Methodology: In this research, the recorded Debi-sediment statistics related to the statistical period of 1381 to 1395 has been used. These statistics include daily instantaneous Debi in cubic meter per second and daily instantaneous sediment in ton per day, which are measured simultaneously. The data used to model the artificial neural network are Debi-sediment values the accuracy of the predictions was evaluated with three error criteria. Findings: The three criteria considered are AFE, FFE and n-AFE, respectively. Discussion and Conclusion: Among these criteria, the FFE criterion showed that the correlation between the model output and the measured sediment data is appropriate. As a result, the LSTM model has the appropriate accuracy to predict the amount of sediment in the two rivers of Qala-e-Rudkhan.
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