نوع مقاله : مقاله پژوهشی
نویسندگان
1 دکتری سازه‌های آبی، گروه علوم و مهندسی آب، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران.
2 استاد، دانشکده مهندسی آب و محیط زیست، دانشگاه شهید چمران اهواز، اهواز، ایران.
3 دانشیار؛ دانشکده کشاورزی و منابع طبیعی؛ گروه علوم و مهندسی آب؛ دانشگاه آزاد اسلامی؛ واحد علوم و تحقیقات؛ تهران؛ ایران
4 دکتری سازه‌های آبی، مدیر بخش مهندسی رودخانه و سواحل شرکت توسعه منابع آب و نیروی ایران.
چکیده
کلیدواژه‌ها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Gully erosion causes a drop in the channel bed, widening the channel and transporting a large amount of sediment downstream. Understanding the effects of various factors such as soil consolidation and the placement of the sandy layer on sediment transport rate are the goals of this research. Therefore, five samples of cohesive soils with various percent of clay and silt with short- and long-term consolidation were tested under natural conditions. Moreover, in one test, a sandy layer was laid on the gully bed to study the effects of this layer. Results indicated gully migration to upstream occurred at angles closer to 90 degrees when the percent of clay was raised. The same reduction in clay amount in long- and short-term consolidation caused the total gully migration and amounts of sediment to increase 2.5 times in long-term compared to short-term consolidation. The effect of clay reduction was more pronounced in the sample with long-term consolidation.
کلیدواژه‌ها [English]
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