کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5785563 1640174 2017 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Dynamics of sediments along with their core properties in the Monastir-Bekalta coastline (Tunisia, Central Mediterranean)
ترجمه فارسی عنوان
دینامیک رسوبات همراه با خواص اصلی آنها در خط ساحلی موناسیت-بکتال (تونس، مدیترانه مرکزی)
کلمات کلیدی
پویایی رسوبات ساحلی، شمال شرقی تونس، مواد معدنی، هیدرودینامیک، رسوبات هسته،
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی
چکیده انگلیسی


- Sediment dynamics depends on sea erosion.
- Sediment of Monastir Bay is highly sensitive due to human activities.
- Particle grain-size distribution due to the effects of swell and wind.
- Mineral sediment in Monastir Bay is related to source rock.
- Marine pollution depends on sediment transport.

The authors report on two campaigns of high-resolution samplings along the shores of Monastir Bay in Tunisia: the first being a study of sediment dynamics, grain size and mineral composition in surface sediment, and the second, eight months later, using four sediment cores to study grain-size distribution in bottom sediments. Particle size analysis of superficial sediment shows that the sand in shallow depths is characterized by S-shaped curves, indicating a certain degree of agitation, possible transport by rip currents near the bottom and hyperbolic curves illustrating heterogeneity of sand stock. The sediments settle in a relatively calm environment. Along the bay shore (from 0 to 2 m depth), the bottom is covered by medium sand. Sediment transport is noted along the coast; from north to south and from south to north, caused by longshore drift and a rip current in the middle of the bay. These two currents are generated by wind and swell, especially by north to northeast waves which transport the finest sediment. Particle size analysis of bottom sediment indicates a mean grain size ranging from coarse to very fine sands while vertical distribution of grain size tends to decrease from surface to depth. The increase in particle size of sediment cores may be due to the coexistence of terrigenous inputs along with the sedimentary transit parallel to the coast due to the effect of longshore drift. Mineralogical analysis shows that Monastir's coastal sands and bottom sediment are composed of quartz, calcite, magnesium calcite, aragonite and hematite. The existence of a low energy zone with potential to accumulate pollutants indicates that managerial action is necessary to help preserve Monastir Bay.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of African Earth Sciences - Volume 134, October 2017, Pages 320-331
نویسندگان
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