کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6441467 1639076 2016 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Understanding and predicting the temporal variability of sediment grain size characteristics on high-energy beaches
ترجمه فارسی عنوان
درک و پیش بینی متغیرهای زمانی از ویژگی های اندازه دانه رسوب در سواحل با انرژی بالا
کلمات کلیدی
رسوبات ساحلی، اندازه دانه، سواحل، اندازه گیری های میدان، مدل سازی،
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات ژئوشیمی و پترولوژی
چکیده انگلیسی
Despite representing a key parameter when modelling morphology or sediment transport, surface sediments are often assumed homogenous, with grain size temporally constant. This contribution uses a 6-year data set of monthly sediment samples to quantify the observed variability in intertidal beach sands at four energetic, macrotidal locations (North Cornwall, UK). Changes in grain size and sorting were related to periods of high-steepness storm waves promoting a relatively rapid coarsening and an improvement in sorting and low-steepness swell waves, a fining and a reduction in sorting. These temporal changes in intertidal grain size were coherently linked to the disequilibrium in wave steepness, with peak coarsening occurring when the instantaneous wave steepness conditions vastly exceeded a temporally evolving antecedent time series. Using this concept, a simple model is proposed that provides skilful predictions of the unseen variability in sediment grain size (average r2 = 0.86, p < 0.01) and sorting (average r2 = 0.75, p < 0.05), at all four sites.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Marine Geology - Volume 376, 1 June 2016, Pages 109-117
نویسندگان
, , , , ,