کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4687062 1635555 2008 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Riffle–pool sequences and meander morphology
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
Riffle–pool sequences and meander morphology
چکیده انگلیسی

The study is aimed at investigating the response of the riffle–pool sequence to increased energy expenditure in the horizontal plane through meander development. It emphasizes field measurements of riffle–pool height and spacing and their links with meander morphology. River reaches in southern Ontario (Canada) were surveyed and statistical relations were established between parameters describing riffle–pool morphology (sequence length and amplitude) and planform curvature. The results indicate a lengthening of the sequence with increased total angular deflection along the measured reaches. Further analysis suggests that this lengthening occurs in the pool as a result of meander development. Apparently, as the path length extends beyond a critical threshold for a given bed material size, the transport capacity of the sequence is compromised. This may promote an initial shortening of the downstream riffle, with depositional processes ultimately forming a new riffle slightly upstream to achieve a new equilibrium. Additional extensive data sets provided by the Toronto and Region Conservation Authority on riffle–pool morphology also suggest that bed material size plays a significant role in controlling riffle–pool morphology.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Geomorphology - Volume 99, Issues 1–4, 1 July 2008, Pages 214–223
نویسندگان
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