scholarly journals Modeling of Sediment Transport Using Wave Height action in Fialaka Marina

2021 ◽  
Vol 958 (1) ◽  
pp. 012023
Author(s):  
K Al-Salem ◽  
A Al-Rashed
Keyword(s):  
Sediment Transport ◽  
Spring Tide ◽  
Arabian Gulf ◽  
Coarse Sand ◽  
Point Of View ◽  
The South ◽  
Plan View ◽  
The North ◽  
Failaka Island ◽  
Southern Half

Abstract Failaka Island is the second-largest and one of the most important islands of Kuwait from the point of view of tourism located in the north Arabian Gulf. It has a marina constructed in 1979 and managed by the Ministry of Communication (MOC) and a tourism enterprise, and is widely used for its ferry landing facility. The coastal waters around Failaka are turbid and current velocities tend to be as high as ~0.5 m/s during spring tide. The marina basin, with axial plan view dimensions of about 285 m by 260 m experiences shoaling of naturally flocculated fine (cohesive) sediment and coarse sand in the entrance channel and more generally in the southern half of the basin. A particularly noteworthy zone of heavy and visible shoaling is along the inner side of the south breakwater close to the entrance. The marina at Failaka Island is suffering from siltation and sediment deposing issues. This study was carried out numerically to assess the annual sedimentation, sediment direction, and longshore current from locations around the existing marina to help in a suggestion of the solutions to reduce the siltation and sediment deposing based on sediments transport direction on marina entrance. A newly developed numerical solution for annual longshore sediments transport was used to estimate the total sediment transport and its direction. The study shows that the annual sediment transport directions which affect the Fialaka marina entrance are coming from the south to north due to wave action.

scholarly journals Numerical Investigation of Hydrodynamics and Cohesive Sediment Transport in Cua Lo and Cua Hoi Estuaries, Vietnam

2021 ◽  
Vol 9 (11) ◽  
pp. 1258
Author(s):  
Viet Thanh Nguyen ◽  
Minh Tuan Vu ◽  
Chi Zhang
Keyword(s):  
Sediment Transport ◽  
Great Influence ◽  
Wave Model ◽  
Sediment Concentration ◽  
Wave Climate ◽  
Cohesive Sediment ◽  
Wave Direction ◽  
The South ◽  
The North ◽  
Cohesive Sediment Transport

Two-dimensional models of large spatial domain including Cua Lo and Cua Hoi estuaries in Nghe An province, Vietnam, were established, calibrated, and verified with the observed data of tidal level, wave height, wave period, wave direction, and suspended sediment concentration. The model was then applied to investigate the hydrodynamics, cohesive sediment transport, and the morphodynamics feedbacks between two estuaries. Results reveal opposite patterns of nearshore currents affected by monsoons, which flow from the north to the south during the northeast (NE) monsoon and from the south to the north during the southeast (SE) monsoon. The spectral wave model results indicate that wave climate is the main control of the sediment transport in the study area. In the NE monsoon, sediment from Cua Lo port transported to the south generates the sand bar in the northern bank of the Cua Hoi estuary, while sediment from Cua Hoi cannot be carried to the Cua Lo estuary due to the presence of Hon Ngu Island and Lan Chau headland. As a result, the longshore sediment transport from the Cua Hoi estuary to the Cua Lo estuary is reduced and interrupted. The growth and degradation of the sand bars at the Cua Hoi estuary have a great influence on the stability of the navigation channel to Ben Thuy port as well as flood drainage of Lam River.

scholarly journals Exchange Mechanism of the Suspended Sediment at the Mouth of Hangzhou Bay under Coastline Changes

2021 ◽  
Vol 233 ◽  
pp. 03035
Author(s):  
Zhuzhu Yu ◽  
Zhiguo He ◽  
Li Li ◽  
Taoyan Ye ◽  
Yuezhang Xia
Keyword(s):  
Sediment Transport ◽  
Numerical Model ◽  
Exchange Mechanism ◽  
Hangzhou Bay ◽  
The South ◽  
Topographic Data ◽  
The North ◽  
Water And Sediment ◽  
Open Sea ◽  
Inflowing Water

Based on FVCOM hydrodynamic numerical model and coastline topographic data in 2013, a three-dimensional numerical model of fine sediment transport in Hangzhou Bay has been established to explore the water and sediment exchange mechanism between Hangzhou Bay and the open sea at different typical sections. The results of validation with measured and satellite retrieved data show that the model can well simulate the process of water and sediment movement in Hangzhou Bay. Compared with the calculation results of the coastline topographic data of Hangzhou Bay in 1974 and 2020, the influence mechanism of shoreline change on the water and sediment exchange mechanism between Hangzhou Bay and the open sea has been studied. The results show that the sediment transport inside and outside the Hangzhou Bay is generally in the pattern of north-inflow and south-discharge. Compared with the coastline in 1974, the sediment transport from Yangshan port in the north of Hangzhou Bay and Zhoushan Islands in the middle of Hangzhou Bay increases when the coastline is pushed into the bay in 2020, while the outward sediment transport from Jintang Channel in the South decreases. The overall trend features that the sediment transport into the bay increases, with the bay mouth silting. In the three sections extending from Hangzhou Bay to the open sea, the inflowing water and sediment of the horizontal section on the north side is decreasing, while the discharged sediment from the south side and the inflowing water and discharged sediment from the vertical section at the east side are increasing.

scholarly journals Observations upon the marine barometer, made during the examina­tion of the coasts of New Holland and New Wales, in the Years 1801, 1802, and 1803. By Matthew Flinders, Esq. Com­mander of His Majesty’s Ship Investigator . In a letter to the Right Hon. Sir Joseph Banks, K. B. P. R. S. &c. &c. &c

1832 ◽  
Vol 1 ◽  
pp. 230-232
Keyword(s):  
The State ◽  
The Other ◽  
South Coast ◽  
The South ◽  
South Side ◽  
The North ◽  
North Side ◽  
Northern Half ◽  
Southern Half ◽  
The Right

The chief circumstance that induced Capt. Flinders to think his observations Upon the marine barometer were worthy of attention, was the coincidence that took place between the rising and falling of the mercury, and the setting in of winds that blew from the sea and from off the land, to which there seemed to be at least as much reference as to the strength of the wind or the state of the atmosphere. Our author’s examination of the coasts of New Holland and the other parts of the Terra Australis, began at Cape Leuwen, and con­tinued eastward along the south coast. His observations, which, on account of their length, we must pass over, show, that a change of wind from the northern half of the compass to any point in the southern half, caused the mercury to rise; and that a contrary change caused it to fall. Also, that the mercury stood considerably higher When the wind came from the south side of east and west, than when, in similar weather, it came from the north side.

scholarly journals Transport Mechanism of Suspended Sediments and Migration Trends of Sediments in the Central Hangzhou Bay

Water ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 2189
Author(s):  
Zekun Song ◽  
Weiyong Shi ◽  
Junbiao Zhang ◽  
Hao Hu ◽  
Feng Zhang ◽  
...  
Keyword(s):  
Sediment Transport ◽  
Suspended Sediment ◽  
Suspended Sediment Concentration ◽  
Suspended Sediments ◽  
Sediment Concentration ◽  
Hangzhou Bay ◽  
The South ◽  
Transport Mode ◽  
Tidal Pumping ◽  
The North

Based on the 2013 field survey data of hydrology, suspended sediments and bottom sediments in the Central Hangzhou Bay, this paper explores the dynamic mechanism of suspended sediments in Hangzhou Bay by employing material flux decomposition. Meanwhile, the migration trends of bed sediments are also investigated by analyzing grain size trends. The results show that during an ebb or flood tide, the hydrograph of suspended sediment concentration of Hangzhou Bay is dominated by an M shape (bimodal), which is attributed primarily to the generation of a soft mud layer and a separate fluid mud layer. Laterally, the distribution of suspended sediment concentration is high in the south and low in the north. From a macroscopic perspective, the net sediment transport in the study area displays a “north-landward and south-seaward” trend, presenting a “C”-shaped transport mode. That is, the sediments are transported from the bay mouth to the bay head on the north side and from the bay head to the bay mouth on the south side. The sediment transports by advection and tidal pumping are predominant, while the sediment transport by vertical circulation makes little contribution to the total sediment transport. Moreover, the sediment transport in the center of the reach area is dominated by advection, whereas that near both sides of the banks is controlled by tidal pumping. The asymmetry of the tides, i.e., flood-dominance in the north and ebb-dominance in the south, is the primary cause of the dynamic mechanism for the overall “C”-shaped transport mode in Hangzhou Bay. Additionally, coupled with the narrow-head wide-mouth geomorphology, Hangzhou Bay remains evolving by south shore silting and north shore scouring.

Numerical Analysis of Ebb Water Split Ratio of the South and North Branch in the Changjiang Estuary

2013 ◽  
Vol 807-809 ◽  
pp. 1624-1627
Author(s):  
Ji Zhong Yang ◽  
Jie Gu ◽  
Dan Qing Ma ◽  
Xiao Li Wang ◽  
Tian Hu ◽  
...  
Keyword(s):  
Spring Tide ◽  
Changjiang Estuary ◽  
The South ◽  
The Changjiang Estuary ◽  
Hydrodynamic Analysis ◽  
The North ◽  
Split Ratio ◽  
Calculation Results ◽  
Set Up ◽  
The One

The change of water split ratio has important impacts on the fluvial process, saltwater intrusion and navigation in estuary area. A 2D hydrodynamics numerical model of the Changjiang Estuary was set up using Delft3D-FLOW. The calculation results are consistent well with the real measured data, which indicates that the model can be used in hydrodynamic analysis. Simulation results show that the ebb water split ratio of the North Branch in the flood season is larger than that in the dry season, while the situation of the South Branch is opposite. Under the condition of different tidal types, the ebb water split ratio for the North Branch is maximum during the spring tide, and minimum during the neap tide, while the one during the middle tide takes the second place.

scholarly journals Arctic Thunder: A Novel by R. Feagan

2011 ◽  
Vol 1 (1) ◽  
Author(s):  
Sandy Campbell
Keyword(s):  
Point Of View ◽  
The Arctic ◽  
The South ◽  
Traffic Light ◽  
Basketball Players ◽  
University Of Alberta ◽  
The North ◽  
Western Arctic ◽  
Turn Over ◽  
The University

Feagan, Robert. Arctic Thunder: A Novel. Toronto: Dundurn Press, 2010. Print. St. Albert is a small city, just north of Edmonton in Central Alberta.  In the opening pages of this book, thirteen-year-old Mike Watson and his team, the St. Albert Rams, win the Alberta Bantam Provincial box lacrosse championship.  Then his father, an RCMP officer, announces that they’ve been posted to Inuvik, which Mike describes as a place “somewhere inside the Arctic Circle and makes winter in St. Albert seem like summer”. The author, Robert Feagan, who lives in St. Albert, but spent much of his youth in RCMP posts across the Canadian Western Arctic, does a good job of presenting the struggles of a thirteen year old boy from the South trying to fit into the largely Inuit and Dene community in Inuvik. The story is definitely told from the point of view of a “white kid from the South”, except that Mike is part Zulu, so he sort of looks like he might fit in. Mike finds that teenagers are teenagers everywhere and when he goes to school he meets: the bully, the nerd whom everyone avoids and the super athletes, who in this case compete in the Arctic Games.  There is even a beautiful female nemesis, Gwen, who is one of the best basketball players Mike has every encountered. While well written and engaging, Feagan sometimes becomes a little didactic in educating the reader about the North.  Characters occasionally launch into unnaturally detailed explanations about things northern. Much of the tension between characters is also resolved too neatly.  Most of the core characters acquire self-understanding, turn over new leaves, and apologize to each other within a very few pages.  Much more realistic is the portrayal of the typical teenager, Mike, whispering a “Thank-you” to his Mom, long after she’s out of earshot. Through the course of the book, Mike (and the reader) come to appreciate what Inuvik, with its single traffic light and one retail store, has to offer.  Feagan works in a sensitive treatment of the role of the elders in the community and the healthy effects of living close to the land.  Of course, lacrosse, which no one plays in Inuvik, is an important thread through the story. Adult readers should not be put off by the fact that this is a young adult novel; it is a good Arctic read for anyone. Highly recommended: 4 out of 4 starsReviewer: Sandy Campbell Sandy is a Health Sciences Librarian at the University of Alberta, who has written hundreds of book reviews across many disciplines.  Sandy thinks that sharing books with children is one of the greatest gifts anyone can give. 

scholarly journals Characterization of a relative gravity minimum in the core of the Pyrenean Axial Zone (Central Pyrenees) 

2021 ◽  
Author(s):  
Pilar Clariana ◽  
Ruth Soto ◽  
Conxi Ayala ◽  
Aina Margalef ◽  
Antonio Casas-Sainz ◽  
...  
Keyword(s):  
Cross Section ◽  
The South ◽  
Axial Zone ◽  
The Core ◽  
The North ◽  
Southern Half ◽  
The Cross ◽  
North And South ◽  
Central Pyrenees

<p>The characterization of the basement architecture of the Pyrenean Axial Zone, backbone of the chain, is crucial to understand its geodynamic evolution and the interplay between tectonism and magmatism. In this work, a new gravity-constrained cross section was built along the Central Pyrenees, between two of the largest Pyrenean Late Variscan granitic complexes, La Maladeta and Andorra-Mont Louis granites, to infer the geometry at depth of the basement host rocks. This cross section is ca. 65 km long and extends from the Mesozoic Bóixols basin in the South to the Late Variscan Bassiès granite to the North, close to the northern end of the Axial Zone. It is based on available geological maps, previous published works and new geological field data; together with newly acquired gravimetric stations (1141), to improve the existent spatial resolution of the gravity data from the databases of the Spanish and Catalan Geological Surveys, and density values from 65 rock samples covering all different lithologies in the cross section. Thus, its geometry at depth is constrained by means of an integrated 2.5D gravity/structural/petrophysical modelling.</p><p>The La Maladeta and Andorra-Mont Louis granites appear aligned in a WNW-ESE direction and both lie within the same Alpine basement unit, the Orri thrust sheet. They are separated about 40 km by the WNW-ESE-oriented Llavorsí syncline, formed by Devonian and Silurian rocks and limited to the north and south by south vergent thrusts. This syncline is located between two large Cambro-Ordovician anticlinorium structures, the La Pallaresa and Orri massifs to the north and south respectively, formed by a monotonous alternation of shales and sandstones with some intercalations of limestones and conglomerates affected by very low to medium grade of metamorphism. Most structures show southern vergence along the cross section, and its southern part is characterized by the occurrence of Triassic evaporites, a significant detachment level decoupling deformation between the Paleozoic basement and the Mesozoic-Cenozoic cover rocks.</p><p>The observed residual anomaly along the cross section shows a relative maximum, coinciding with the southern edge of the Axial Zone (Nogueras Zone) and southern half of the Orri massif, followed to the north by a relative large minimum. This gravity minimum in the core of the Axial Zone coincides with the northern half of the Orri massif, the Llavorsí syncline and southern half of the La Pallaresa massif and must be related at depth with rocks of lower density with respect to rocks located to the North and South. Two possible solutions have been postulated to explain the presence of lower density rocks: (i) the presence of Triassic evaporites at depth as a continuation to the North of the Triassic evaporites outcropping in the Rialp window located to the South and/or (ii) the presence of buried granitic bodies equivalent to the adjacent La Maladeta and Andorra-Mont Louis granites.</p>

The Bantu Expansion and the SOAS Network

1988 ◽  
Vol 15 ◽  
pp. 261-301 ◽  
Author(s):  
Colin Flight
Keyword(s):  
Boundary Line ◽  
The South ◽  
Irregular Boundary ◽  
African Languages ◽  
North East ◽  
The North ◽  
Northern Half ◽  
Southern Half ◽  
Independent Families ◽  
The Many

One difference between linguists and other Africanists seemed to be that others were prepared to jettison one part of their training to help other disciplines, but linguists apparently would not. Was this so, and if so, why?The Bantu expansion has been a problem for historians ever since the recognition by linguists of a single startling fact. During the nineteenth century, the descriptions of African languages available to scholars in Europe grew steadily in number; they also tended to gain in detail, and in accuracy. It thus became increasingly clear that a sinuous line could be traced across the map distinguishing a zone of extremely high diversity in the north from a zone of low diversity in the south. By the 1880s a popularizing writer could claim that this contrast was generally recognized “by students of African languages.” The situation as he described it was that in the northern half of the continent there are bewildering multitudes of diverse tongues belonging to many independent families, and apparently irreducible to a common origin. Yet cross the irregular boundary-line which runs over the continent from 6° N. on the west coast to the Equator on the east coast … and what do we find? Why that the whole of the southern half of Africa, with the exception of the Masai and Galla intrusion in the north-east and the Hottentot enclave in the south-west, is the domain of a single homogeneous family of languages, … differing perhaps less among themselves than do the many offshoots of the Aryan stock.

scholarly journals On Certain Bodies, apparently of Organic Origin, from a Quartzite Bed near Inveraray

1890 ◽  
Vol 16 ◽  
pp. 39-64
Author(s):  
His Grace the Duke of Argyll
Keyword(s):  
West Coast ◽  
Point Of View ◽  
The South ◽  
North West ◽  
Total Absence ◽  
The North

The magnificent sections of the Archæan and Palæozoic rocks which are presented on the north-west coast of Scotland, have long been known to all British geologists. They occur principally in the counties of Sutherland and Wester Ross, from Cape Wrath on the north to Loch Kishorn on the south. They are not less striking in an artistic, than they are instructive in a scientific point of view. The height of the mountains, their abrupt and precipitous forms, and the thinness, or almost total absence of, superficial covering, are characteristics which combine with great variety and richness of colouring, to produce scenery which stands altogether by itself

The Alston Block

1928 ◽  
Vol 65 (10) ◽  
pp. 433-448 ◽  
Author(s):  
F. M. Trotter ◽  
S. E. Hollingworth
Keyword(s):  
Rigid Block ◽  
The South ◽  
The West ◽  
Lower Carboniferous ◽  
The North ◽  
Fault Block ◽  
Eastern Boundary ◽  
Northern Half ◽  
Southern Half ◽  
Coal Measures

The area covered by this paper embraces the northern end of the Pennines—the uplands of Lower Carboniferous rocks centred about Alston, together with the low ground of the Tyne-Irthing gap to the north. It is bounded on the west by the Vale of Eden. The Pennine portion is separated structurally from the regions to the north and west by the Stublick and Pennine Faults respectively. The former trends E.N.E., it has a downthrow to the north and has resulted in the preservation of the string of Coal Measures outliers which form a connecting link between the Cumberland and Northumberland coalfields. The Pennine Fault, trending S.S.E., with a throw of several thousand feet to the west, brings the New Red rocks of the Vale of Eden against the Lower Carboniferous beds of the Pennine Escarpment. These two faults meet at right angles near Castle Carrock. To the south the Pennine Fault dies out near Stainmore, and another dislocation, the Dent Fault, trending S.S.W., develops, and eventually links up with the Craven Faults which have an E.S.E. trend. These four faults, as pointed out by Professor Kendall, have the form of a reversed 3, and the region within this figure has become known generally as the Northumbrian Fault Block. Professor Marr has aptly termed the southern half of this area the “Rigid Block”. The northern half of the Northumbrian Fault Block, which will be shown to possess many characters in common with the southern half, is here called the “Aiston Block”. Its limits are defined on three sides—by the Stublick Fault on the north, the Pennine Fault on the west, and by the Stainmore depression on the south. The last thus divides the Northumbrian Fault Block into two, physiographically and structurally. The eastern boundary of the Alston Block is concealed beneath the Mesozoic rocks.

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