scholarly journals SEDIMENTATION PATTERN OF SOILS SOUTH EL-AMIRIA, ALEXANDRIA GOVERNORATE, EGYPT

2021 ◽  
Vol 6 (6) ◽  
pp. 183-196
Author(s):  
A. M. A. Zayed ◽  
H. M. A. El-Tapey ◽  
A. A. Al-Toukhy
Keyword(s):  
Sedimentation Pattern

scholarly journals A Study of Sedimentation at the River Estuary on the Change of Reservoir Storage

2018 ◽  
Vol 31 ◽  
pp. 03001 ◽  
Author(s):  
Iskahar ◽  
Suripin ◽  
Isdiyana
Keyword(s):  
Flow Velocity ◽  
Water Level ◽  
Physical Model ◽  
River Estuary ◽  
Cross Sectional Area ◽  
Sectional Area ◽  
Sedimentation Pattern ◽  
Cross Sectional ◽  
Channel Angle ◽  
Reservoir Storage

Estuary of the river that leads to the reservoir has characteristics include: relatively flat, there is a change in the increase of wet cross-sectional area and backwater. The backwater will cause the flow velocity to be reduced, so that the grains of sediment with a certain diameter carried by the flow will settle in the estuary of the river. The purpose of this research is to know the distribution and sedimentation pattern at the river estuary that leads to the reservoir with the change of water level in the reservoir storage, so the solution can be found to remove / reduce sediment before entering the reservoir. The method used is the experimental, by making the physical model of the river estuary leading to the reservoir. This study expects a solution to reduce sedimentation, so that sedimentation can be removed / minimized before entering the reservoir. This research tries to apply bypass channel to reduce the sedimentation at the river estuary. Bypass channels can be applied to overcome sedimentation at the river estuary, but in order for the sediment to be removed optimally, it is necessary to modify the mouth of bypass channel and channel angle.

Interpretability of Quaternary palaeo dune fields (Eastern Canary Islands)

2020 ◽  
Author(s):  
Christopher-B. Roettig ◽  
Thomas Kolb ◽  
Christoph Schmidt ◽  
Ludwig Zöller ◽  
Dominik Faust
Keyword(s):  
Canary Islands ◽  
Driving Force ◽  
Lava Flows ◽  
Sand Transport ◽  
Western Coast ◽  
Carbonate Sand ◽  
Sedimentation Pattern ◽  
Shallow Marine ◽  
Stratigraphic Position ◽  
Carbonate Crust

<p>Generally, the Quaternary palaeo dune fields on the Eastern Canary Islands are built up by different dune generations which are seperated by reddish silty layers. The biogenic carbonate sands originate from the shallow marine shelf around the islands and reach the dune fields from northern direction.</p><p>On northern Fuerteventura different lava flows were formed during the Late Pleistocene, and gradually interrupted the sand pathways of the dune fields close to the western coast. The sedimentation pattern in these dune fields indicates that this cut off was completed not later than 50 ka. A huge calcium carbonate crust in the outcrops marks the stratigraphic position of that final cut off. This crust was a subject of intensive debates, and was formerly linked to unstable environmental conditions. However, within the dune fields on the neigbouring island Lanzarote we did not find a comparable carbonate crust at the similar stratigraphic position. Instead, the El Jable dune field on northwestern Lanzarote shows a well-resolved dune sequence with intercalated silty layers during that period.</p><p>Consequently, the dune fields on the Eastern Canary Islands point to the importance of carbonate sand transport as the main driving force within the sediment system. Finally we can conclude that unimpaired sand pathways are a mandatory prerequisite for the buildup of palaeoclimatic signals in the Quaternary dune archives.</p>

Glacio-eustatic variability in the sedimentation pattern over northern Japan during the past 600 ka

2020 ◽  
Author(s):  
Sushree Sova Barik ◽  
Raj K. Singh ◽  
Pratik K. Upadhyaya ◽  
Lisantaraj Biswal ◽  
Nishant Vats ◽  
...  
Keyword(s):  
Grain Size ◽  
Energy Condition ◽  
Ice Sheets ◽  
Japan Sea ◽  
Mineral Analysis ◽  
Sedimentation Pattern ◽  
The Past ◽  
The Japan Sea ◽  
Size Data ◽  
Northern Japan

<p>The Japan Sea is a semi-enclosed marginal sea affected by global sea-level fluctuation, expansion of seasonal and permanent sea-ice cover, having a significant influence on the regional climate neighboring Japan Sea. Middle Pleistocene to Holocene sediments of the Integrated Ocean Drilling Program site U1423 situated in the northeastern part of Japan Sea was processed for the grain size analysis, semi-quantitative mineral analysis, and clay mineral analysis to access glacio-eustatic control on sedimentation pattern over Japan Sea during the past 610 ka. The average time resolution per sample is ~10 kyr. The mean grain size data suggest the dominance of silt size fraction over the sand and clay. The end member modeling of grain size data suggests the presence of two different energy conditions that varied with the time and influenced by the glacio-eustatic changes over the Japan Sea. The grain size data are relatively coarser and deposited in the higher energy condition during the glacial periods in comparison to interglacial periods except for MIS 2, 4, and 8. The higher energy condition during the glacial intervals suggesting deposition of grains due to the melting of seasonal/permanent ice sheets in the northern Japan Sea. The eolian dust brought from the Chinese loess deposits are relative finer in size and dominated by a higher proportion of quartz. During the glacial phases, illite and kaolinite (%) show a decreasing trend than the interglacial phases suggesting less terrigenous input. The high illite and decreased smectite (%) during interglacial phases suggest a higher degree of physical weathering. The significant increase in the smectite/(illite+chlorite) ratio suggests a higher degree of chemical weathering of the nearby source area, which varied over time. The overall study suggests the phase-wise variability in the presence of permanent/seasonal ice sheets and East Aian Winter Monsoon strength during the past 600 ka.</p>

The Effect of Tide to Current and Sedimentation Pattern in Amurang Bay, North Sulawesi

2019 ◽  
Vol 6 (10) ◽  
pp. 14-22
Author(s):  
Tommy Jansen ◽  
Roski R. I. Legrans ◽  
Pingkan Pratasis
Keyword(s):  
Sedimentation Pattern ◽  
North Sulawesi
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