{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Lecture15-Harbor-Hydraulics

# Lecture15-Harbor-Hydraulics - TTETTE-6755 Port Planning and...

This preview shows pages 1–18. Sign up to view the full content.

TTE TTE-6755 Port Planning and Design 6755 Port Planning and Design Lecture #15 Harbor Hydraulics - Tides. - Waves - Currents. - Scour . Luis Prieto-Portar 2009

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Can you design something “cheap” to deal with this every day.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Encompasses all movement of water within a particular port or harbor Currents within a port can both help and hurt its structural and environmental integrity (e.g., sedimentation, pollutants) Surface current velocities, San Pedro de Sula, Honduras. Wave action versus navigability issues (harbor entrance, breakwaters, jetties) °±²³´µ¶·¸´µ¹¶º»¼»½±º¾¿¾»·À¶Á¾
Wave Action. - Waves created can be of short or long-period ; - Many probabilistic models have been developed for different wave frequencies and amplitudes; - Prior to design, storm surges and tidal effects must be considered; and - Waves can be diffracted, reflected, or transmitted.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Diffracted waves generated inside a harbor from its entrance.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
The diffraction of waves: H d = diffracted wave height; H i = incident wave height; r = radial distance to diffracted wave; ° = angle between breakwater and the radial; q = incident wave direction; and L = wave-length.
Example. Find the wave height in the lee of the breakwater, if ° = 30º; radial distance r = 100 m; period T = 6 seconds; the wave height H i = 2 m; ± = 60º; lee-water depth = 10 m; wave length L = 48 m. Solution: 100 1) = = 2.08 48 r m L m ( )( ) 2) From figure on the next slide, for = 30º and = 2.08 yields '= 0.28 3) The diffracted wave height ' 0.5 2 0.28 6 d i r K L H H K m m β = = =

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Wave diffraction diagram:
The Transmission and Reflection of Waves. When a wave hits a breakwater it will be partially reflected, partially absorbed, and some wave energy will be transmitted. The most critical wave energy comes from the reflected waves within the harbor boundaries, because the create harbor wave oscillations. Structures within the harbor have different reflection coefficients which govern their designs. Harbor Oscillations. Vertical motions from waves within a harbor may be small, yet their horizontal motions can be very large. The port engineer must try to prevent the waves and currents from matching their natural resonant periods with that of the harbor. For this reason, sources of friction for the waves within a harbor is good factor for design.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Wave reflections within the confines of a harbor.
Waves Impacting Port Structures

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Harbor Currents. Hydrodynamic forces acting on a ship include its inertial mass, propeller, rudder, and crosscurrent forces (among many others). Currents can be freshwater (river), or tidal. Currents cause toe scour of quay walls and bulkheads, which lead to structural failure. Currents serve an important role in flushing waste from the harbor basin.
The stability of port infrastructure under the action of waves and currents.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern