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نقش اصلی آبشکنهای نفوذناپذیر، انحراف جریان از کناره به سمت میانه رودخانه است. نتیجه انحراف جریان، توسعه یک ناحیه چرخشی با تلاطم شدید پیرامون آبشکن است که این ناحیه از فاصله کمتری در بالادست تا فاصله بیشتری در پاییندست آبشکن ظاهر میگردد. در این ناحیه، مجموعهای از گردابههای افقی و عمودی فعالیت داشته که تلاطم شدیدی را در سطح آب پدید میآورد....
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