Volume 9, Issue 3 (2021)                   ECOPERSIA 2021, 9(3): 0-0 | Back to browse issues page

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Dehbashi F, Azarmsa S A. Differences between Sediment Grain Size in Rip Channel and its Surrounding Area in Royan Marine Ecosystem, Iran. ECOPERSIA. 2021; 9 (3)
URL: http://ecopersia.modares.ac.ir/article-24-37077-en.html
1- 1Graduate student of physical Oceanography, Marine Physics Department, Tarbiat Modares University
2- Associate Professor, Marine Physics Department, Tarbiat Modares University , azarmsaa@modares.ac.ir
Abstract:   (92 Views)
Aims In this study, sediment size distribution and its statistical properties is studied in the rip channel and its surroundings in the Royan marine ecosystem lied in the southern part of the Caspian Sea.
Materials & Methods Three rip current channels were selected in each eight investigating months. Sediment samples were collected from inside each rip channel and its surrounding areas. The statistical indices, viz., D50, mean, skewness and sorting, have been calculated for sediment grain size parameter. Finally, a general linear model and unpaired t-test were used to perform statistical comparisons of grain size characteristics between rip channel and its surrounding area.
Findings In May, June and July the medians of sediment grain size were significantly higher in the rip channel (202.7 mm, 168.9 mm and 174.5 mm, respectively) compared with its surrounding areas. In general, mean of sediment grain size was significantly higher in the rip channel (193.1 mm) than control area (176.3 mm). In May, June and July, the highest values of mean of grain size of sediments were related to the rip channel (226.9 mm, 178.5 mm and 183.2 mm, respectively).
Conclusion The rip channel contains sediments with coarser grains than the surrounding area. In fact, the rip current leads the median and mean of sediment size distribution in the rip channel to move toward the larger sizes. Moreover, the skewness is a more sensitive factor to environmental changes of channel and its surrounding area than the other sediment properties, emphasizing to consider in the studies.
     
Article Type: Original Research | Subject: Marine Ecosystems
Received: 2019/10/5 | Accepted: 2020/11/22 | Published: 2021/04/29

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