scholarly journals Effects of proposed navigation channel improvements on sediment transport in Mobile Harbor, Alabama

2018 ◽  
Author(s):  
Davina L. Passeri ◽  
Joseph W. Long ◽  
Robert L. Jenkins ◽  
David M. Thompson
Keyword(s):  
Sediment Transport ◽  
Mobile Harbor ◽  
Navigation Channel

scholarly journals Effects of waves and currents on the siltation problem of Damietta harbour, Nile Delta coast, Egypt

2007 ◽  
Vol 8 (2) ◽  
pp. 33 ◽  
Author(s):  
ABO BAKER.I. ABO ZED
Keyword(s):  
Sediment Transport ◽  
Nile Delta ◽  
Monitoring Program ◽  
Wave Direction ◽  
Littoral Drift ◽  
Wave Refraction ◽  
The North ◽  
Dynamic Factors ◽  
Navigation Channel ◽  
Nile Delta Coast

This study evaluates the effect of prevailing dynamic factors on the sedimentation process in Damietta Harbour along the Nile delta coast of Egypt. The monitoring program spanned the period between 1978 and 1999 and included measurements of waves, currents and bathymetric profiles. The evaluation was based on determination of erosion and accretion rates, current regime, sediment transport, wave characteristics and wave refraction. Results revealed that the predominant wave direction from N-NW sector (86 %) throughout the year is responsible for generation of a longshore eastward current. Less frequent waves from the N-NE sector generate an opposing longshore westward current. The refraction pattern for the prevailing wave direction indicates that the harbour and its navigation channel are located within a divergence of wave orthogonal and in an accretion sediment sink area. The annual net rate of littoral drift on the western side of the harbour is about 1.43 * 105 m3 (accretion), while the annual net rate of littoral drift on the eastern side is about 2.54 * 105 m3 (erosion). Currents fluctuate tremendously in speed and direction, especially during the winter months. Hence, sediment transport takes place in offshore, eastward, and onshore directions. Progressive vector diagrams show that the largest near bottom offshore, onshore and easterly net drift occurs during summer, spring and winter respectively. The onshore sediment transport generated during spring and summer plays an important role in the redistribution of eroded sediments during the winter. The overall study of dynamic factors indicated that the harbour site is characterized by eastern, western, offshore and onshore sediment movements. Therefore, the north-south orientation of the navigation channel, with its depth greater than the surrounding area, interrupts sediment drift from different directions and reduces the current speed. Consequently, the sediments sink within the navigation channel from different directions. The sources of sediments contributing to the siltation process of the harbour and its navigation channels are mainly derived from the Rosetta promontory, Burullus beaches, Damietta promontory and from offshore and the dumping area.

scholarly journals NORTH JETTY COASTLINE EVOLUTION AND SHORELINE ENGINEERING, GRAYS HARBOR, WASHINGTON

2018 ◽  
pp. 84
Author(s):  
Aaron Porter ◽  
Vladimir Shepsis ◽  
George Kaminsky ◽  
David Michalsen
Keyword(s):  
Sediment Transport ◽  
Sandy Beach ◽  
Transport Processes ◽  
Shoreline Erosion ◽  
Natural Sediment ◽  
Erosion Processes ◽  
The North ◽  
Coastline Evolution ◽  
Navigation Channel ◽  
The City

This study was initiated by the Port of Grays Harbor and the City of Ocean Shores, WA to address ongoing shoreline erosion processes, and sedimentation at the Grays Harbor Federal Navigation Channel. The North Jetty at the entrance to Grays Harbor Estuary, WA was constructed at the beginning of last century (1907) and resulted in major regional changes to the coastline. During the first 40 years post-construction of the jetty, approximately ten miles of sandy beach shoreline, two miles wide north of the jetty, was created by natural sediment transport processes. The accreted land was the base for the creation of the City of Ocean Shores. Since that time the shoreline has been periodically altered by extreme erosion events.

scholarly journals Evaluation of the potential impacts of the proposed Mobile Harbor navigation channel expansion on the aquatic resources of Mobile Bay, Alabama

2020 ◽  
Author(s):  
Jacob Berkowitz ◽  
Safra Altman ◽  
Kevin Reine ◽  
Dara Wilbur ◽  
Michael Kjelland ◽  
...  
Keyword(s):  
Mobile Bay ◽  
Aquatic Resources ◽  
Mobile Harbor ◽  
Navigation Channel ◽  
Channel Expansion

scholarly journals Sediment Transport into the Swinomish Navigation Channel, Puget Sound—Habitat Restoration versus Navigation Maintenance Needs

2017 ◽  
Vol 5 (2) ◽  
pp. 19 ◽  
Author(s):  
Tarang Khangaonkar ◽  
Adi Nugraha ◽  
Steve Hinton ◽  
David Michalsen ◽  
Scott Brown
Keyword(s):  
Sediment Transport ◽  
Habitat Restoration ◽  
Puget Sound ◽  
Navigation Channel

scholarly journals PENANGANAN SEDIMENTASI PADA PELABUHAN KUALA RAJA KABUPATEN BIREUEN

2015 ◽  
Vol 1 (1) ◽  
pp. 57-68
Author(s):  
Cut Rahmawati
Keyword(s):  
Sediment Transport ◽  
Current Data ◽  
Economic Feasibility ◽  
Standard Size ◽  
The North ◽  
Navigation Channel ◽  
Topographic Survey ◽  
Current Survey ◽  
Sedimentation Volume ◽  
The Right

The objective of this study is to provide an alternative design of sediment problems in Kuala Raja Port that causes disadvantages for the local fishermen due to ineffective port utilization. The primary surveys conducted in this study are topographic survey, bathymetry survey, current survey and geological survey. The wind data is obtained from the Malikul Saleh Meteorological Station. Based on the tidal survey, the water surface during the tide water is 1,56 m above  0.00 m LWS. The current data shows that the flow rate is low, which is less than 1.5 m/sec whereas not interfere ships’ movement, because the standard size of ships allowed crossing the shipping lanes is planned less than 50 GT. Based on the correction using SPM nomogram acquired high waves 3.50 m with wind speed > 20 knots and the North largest fetch  490.04 miles. Sediment transport on shore of Kuala Raja beach is  46,934.59 m3/year moves from West to East. The hand bore data on the location of the planned jetty obtained SG = 2,648, Wc = 25.66, gd = 1,549, f = 31.00, c = 0.03. Therefore, the determination of the layout of jetty at Kuala Raja Port is considering the direction of sediment transport, the wave height that occurs, the field data attained and the economic feasibility. Sediment management at the Kuala Raja Port can be done within 2 (two) ways: firstly by increasing the length of the jetty on the left and the right side and, secondly by dredging the navigation channel. The length of the jetty that is needed to expand on the left side is 284 meters long and 127.65 meters long on the right side, in order to avoid the addition of sedimentation volume. The jetty’s slope is planned 1: 2 outside the channel and 1: 1 inside the navigation channel. The dredging volume at the port entrance is approximately 39,811.60 m3.

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