Western Breakwater -Port Expansion in Hanstholm

  • Client: Port of Hanstholm
  • Start date: 01/04/2018

Project information

Drawing -CAD-A3-02

Country: Denmark

Contractor/designer: AARSLEFF/COWI

 

Background

The port of Hanstholm was built in 1,961-68 and expanded in 1,984-87. The outer breakwaters currently consist of circular concrete caissons. The water depth at the entrance and the outer basin increases from 9.0m to approx. 11m and the entrance width increases from 140m to 170m.

The Port of Hanstholm is planning a major expansion of the port in order to achieve: a larger water depth in the navigation channel; new quays with larger water depth; more hinterland; better navigation conditions; more calm wave climate in the existing port.

Port Expansion project includes the design and construction of a Western and Eastern breakwater. The Western breakwater is designed by COWI as solution with a Cubipod single-layer armour, and its roundhead includes a vertical caisson.

 

Design conditions for western breakwater

Ensayos

  • Breakwater length: 396 m

  • Max. water depth: 13.0 m

  • Design wave height: (Hm0): 8.2 m H1/3 at breakwater toe: 9.0 m

  • Peak wave period: 16.5 s

  • Slope H/V= 1.75/1 (1.5/1 Rear-side)

  • CUBIPOD high density (2.7 t/m3 & 3.0 t/m³) single-layer in trunk (15t &22t) and round head (30t & 33t)

  • Breakwater crest: +8.2 a +8.6 m

  • 2D & 3D stability and overtopping tests by Aalborg University

  • 2D stability tests by Braunschweig Technical University

Constructive aspects

  • 1,843 CUBIPOD 15 t (5.55 m³)

  • 694 CUBIPOD 22 t (8.15 m³)

  • 175 CUBIPOD 30&33 t (11.11 m³)

  • Total CUBIPOD concrete volume: 17,807.00 m3

  • 12 molds for CUBIPOD 15 t

  • 5 molds for CUBIPOD 22 t

  • 2 molds for CUBIPOD 30t & 33t