scholarly journals A boulder-strewn tidal flat, north shore of the Gulf of St. Lawrence, Québec

2011 ◽  
Vol 35 (2) ◽  
pp. 261-267 ◽  
Author(s):  
Jean-Claude Dionne
Keyword(s):  
Wave Energy ◽  
Tidal Flat ◽  
Slope Gradient ◽  
North Shore ◽  
Energy Regime ◽  
Ice Rafting

A clay flat strewn with ice-drifted boulders occurs in a sheltered embayment near Harrington Harbour, North Shore of the Gulf of St. Lawrence. The embayment, approx. 7 km2 in area with a slope gradient less than 0.2°, is under the influence of tides ranging from 1.4 to 2.2 m and of a low wave energy regime. Ice entirely covers the flat during 3 to 4 months per year but may be present up to 5 months. Ice rafting, ice pushing, and ice gauging are moderately important processes in the embayment.

scholarly journals VEGETATION INFLUENCED HYDRODYNAMICS AND SEDIMENT TRANSPORT

2018 ◽  
pp. 13
Author(s):  
Sha Lou ◽  
Ming Chen ◽  
Shuguang Liu ◽  
Guihui Zhong
Keyword(s):  
Sediment Transport ◽  
Transition Zone ◽  
Storm Surge ◽  
Wave Energy ◽  
Tidal Flat ◽  
Morphological Evolution ◽  
Energy Reduction ◽  
Physical Processes ◽  
Ecological Regime ◽  
Flume Study

Tidal flat is a transition zone between land and ocean. Vegetation in tidal flat can protect the coastal areas from storm surge and tsunamis by wave energy reduction. Tidal flat also can filter parts of the artificial contaminations and reduce the pollutants discharged into the ocean. In addition, interactions between vegetation and morphology over tidal flat have strong impacts on ecological regime and morphological evolution. However, there are too many complex physical processes involving in the interaction among hydrodynamics, sediment transport and vegetation. Therefore, a flume study was carried out in this paper to study the effects of vegetation on hydrodynamics and sediment transport.

Tidal Modulation of Moderate Wave Energy on a Sandy Tidal Flat on the Macrotidal Amazon Littoral

2016 ◽  
Vol 75 (sp1) ◽  
pp. 487-491 ◽  
Author(s):  
Wellington Trindade ◽  
Luci C. C. Pereira ◽  
Ana Vila-Concejo
Keyword(s):  
Wave Energy ◽  
Tidal Flat

CYCLONE MODELS FOR A SUBMERGED BREAKWATER

2014 ◽  
Vol 1 (1) ◽  
Author(s):  
Punyaanek Srisurin ◽  
Amarjit Singh
Keyword(s):  
Wave Energy ◽  
Simulation Models ◽  
Sensitivity Analyses ◽  
The West ◽  
Submerged Breakwater ◽  
North Shore ◽  
The North ◽  
Calm Water ◽  
Protective Structures ◽  
Construction Plans

Kahului Harbor, located on the north shore of Maui, Hawaii, is approached by waves from the northwest in winter and northeast in summer. Wave energy entering the harbor during large swell events has repeatedly caused damage to existing protective structures and operations. As a result, a 706-meter long breakwater on the west was constructed to provide additional tranquility inside the harbor. A breakwater on the east with an 843-meter length was constructed to protect against waves approaching from north and northeast. However, strong wave energy still damages the harbor through the 12-meter deep and 183-meter wide entrance channel. Consequently, a submerged breakwater could be constructed in order to mitigate the wave energy that continues to damage the pier. The objective of making these models is to determine the most appropriate construction approach for the project based on construction duration and related variable costs. The study also aims to see if the project can be completed within a 5-month window during calm water. Two construction approaches were proposed—(1) using one construction crew per geotextile grid, and (2) using multiple crews per geotextile grid. Sensitivity analyses were performed on both proposed construction approaches by adjusting the number of laborers hired. This report provides the proposed geotextile submerged breakwater details based on construction plans viewed through the simulation models using EZStrobe.

Trace fossils and marine-nonmarine cyclicity in the Fountain Formation (Pennsylvanian: Morrowan/Atokan) near Manitou Springs, Colorado

1990 ◽  
Vol 64 (6) ◽  
pp. 859-880 ◽  
Author(s):  
Christopher G. Maples ◽  
Lee J. Suttner
Keyword(s):  
Wave Energy ◽  
Trace Fossils ◽  
Alluvial Fan ◽  
Trace Fossil ◽  
Coarse Grained ◽  
Sedimentary Processes ◽  
Marine Strata ◽  
Energy Regime ◽  
Marine Sedimentation ◽  
Composition Changes

The Lower Pennsylvanian (Morrowan/Atokan) portion of the Fountain Formation in the Manitou Springs, Colorado, area commonly has been interpreted as a subaerial alluvial fan. However, approximately 12 marine-nonmarine cycles, each represented by a discrete progradational sequence, have been recognized within the lower third of the Fountain Formation in this area. The typical cycle is composed of six lithofacies: 1) transgressive-lag conglomerate; 2) offshore mudstone; 3) hummocky crossbedded sandstone; 4) planar crossbedded granular sandstone; 5) low-angle, crossbedded, coarse-grained sandstone; 6) lenticular conglomeratic sandstone. Only lithofacies 6 is nonmarine (alluvial) in origin. Two diverse trace-fossil assemblages (totalling 18 ichnogenera and 20 ichnospecies) within the Fountain Formation are restricted to the marine portions of the section, or to those portions within 1 m below marine-deposited strata. The assemblage includes Arenicolites carbonarius, ?A. ichnosp., Aulichnites parkerensis, two types of Chondrites, ?Conostichus broadheadi, ?Crossopodia ichnosp., Curvolithus manitouensis (ichnosp. nov.), Eione ichnosp., Lockeia ichnosp., Macaronichnus segregatis, Palaeophycus heberti, Palaeophycus striatus, Planolites beverleyensis, Psammichnites plummeri, Rhizocorallium irregulare, ?Skolithos ichnosp., Taenidium serpentinum, ?Teichichnus ichnosp., ?Thalassinoides ichnosp., ?Zoophycos ichnosp., and several unnamed traces.Trace fossils in the Fountain Formation can be used as indicators of sedimentary processes (e.g., rates of deposition, energy regime). Trace-fossil composition changes along a roughly south-to-north, nearshore-to-offshore gradient, generally reflecting increased influence and duration of normal-marine sedimentation. Ichnotaxa present and their distributions within marine strata in the lower part of the Fountain Formation suggest that they belong to the Curvolithus ichnoassemblage, which has been shown to indicate high sedimentaiton rates in relatively nearshore shelf settings. The Curvolithus ichnoassemblage can be subdivided into Macaronichnus-dominated and Curvolithus-dominated parts. Macaronichnus-dominated portions of the Fountain Formation indicate generally higher wave-energy sedimentation as compared with Curvolithus-dominated portions.

Influence of Spacing on Mechanically Transplanted Seagrass Survival in a High Wave Energy Regime

2003 ◽  
Vol 11 (1) ◽  
pp. 56-61 ◽  
Author(s):  
Eric I. Paling ◽  
Mike van Keulen ◽  
Karen D. Wheeler ◽  
Jim Phillips ◽  
Roger Dyhrberg
Keyword(s):  
Wave Energy ◽  
High Wave ◽  
Energy Regime ◽  
High Wave Energy
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