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Faculty of Coastal Engineering
BED, BANK & SHORE PROTECTION
Lecturer: Pham Thu Huong Email: Huong.p.t@wru.edu.vn
Chapter 8
Ships – Loads, Stability and erosion
(3 class hours)
Content
8.1 Introduction 8.2 Loads
8.3 Stability 8.4 Erosion 8.5 Summary
Introduction
In inland waterways, ships may cause wave:
• Primary wave: starts with the front wave, followed by the depression and ending with the stern wave → severe attack on the banks(narrow navigation channels)
• Secondary wave: The much shorter waves that originate from the hull (plays an important role in larger navigation channels)
• Propeller wash: The currents caused by the ship`s propeller (it is particularly important when ships manoeuvre near a berthing place or a jetty)
Introduction (cont)
Most damage on revetment cause by: • large ships ~ sailing slowly
⮳erosion due to return current
• small service crafts, tugs… ~ sailing fast ⮳bank erosion due to secondary waves
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