کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4687075 1635555 2008 17 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Terrace aggradation during the 1978 flood on Powder River, Montana, USA
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
Terrace aggradation during the 1978 flood on Powder River, Montana, USA
چکیده انگلیسی
Vegetation controlled the type, thickness, and stratigraphy of the aggradation on terrace surfaces. Two characteristic overbank deposits were common: coarsening-upward sequences and lee dunes. Grass caused the deposition of the coarsening-upward sequences, which had 0.02 to 0.07 m of mud at the base, and in some cases, the deposits coarsened upwards to coarse sand on the top. Lee dunes, composed of fine and very fine sand, were deposited in the wake zone downstream from the trees. The characteristic morphology of the dunes can be used to estimate some flood variables such as suspended-sediment particle size, minimum depth, and critical shear velocity. Information about depositional processes during extreme floods is rare, and therefore, the results from this study aid in interpreting the record of terrace stratigraphy along other rivers.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Geomorphology - Volume 99, Issues 1–4, 1 July 2008, Pages 387-403
نویسندگان
, ,