—Tg. Piai, located on the southern tip of west
Malaysia in Johor, is subject to critical coastal erosion on the
east side of the headland, and, as a consequence, severe loss of
protected mangrove coastline has been observed over the past 20
years. Various triggers for this erosion have been proposed, all
being linked to the extensive developments of the region, and the
increase in marine activities in the waters of Singapore Strait. In
this study, impacts on the regional (ambient) wave field, by the
presence of ships in the Strait of Singapore, are investigated.
Waves are partially reflected off the hulls of the ships, and the
extensive presence of ships in the Strait of Singapore thus
manifests itself as a blocking of the ambient wave field, resulting
in a wave climate near Tg. Piai that depend on the congestion of
ships. The integrated effect of the ship hull-induced wave
reflections on the ambient wave field is evaluated by using the
numerical modelling tool MIKE 21. Information on the number,
the positions and the sizes of the ships are determined from
satellite images. It is found that the impacts of ship hull-induced wave reflections on the near shore wave field at Tg. Piai are
significant, and, in particular, that the impacts on near shore
wave periods are pronounced. The MIKE 21 model predicts
significant reductions in the wave periods at Tg. Piai when
including the ships. These changes in the wave periods can
explain the changes to the coastal morphology observed at Tg.
Piai, including the coastal erosion, from the notion that the
longer waves in the wave spectrum tend to push sediment in the
coastal profile onshore, whereas the shorter waves moves
—Coastal stability, environmental impact, Johor,
Jacob Hjelmager Jensen was with Technical University of Denmark. He
is now the Technical Director is with DHI Water and Environment (M) Sdn
Bhd, Kuala Lumpur, Malaysia (e-mail: email@example.com).
Juan C. Savioli and Khairunnisa Saaban are with Coastal and Marine
Department, DHI Water and Environment (M) Sdn Bhd, Kuala Lumpur,
Malaysia (e-mail: firstname.lastname@example.org, email@example.com).
Cite: Jacob Hjelmager Jensen, Juan C Savioli, and Khairunnisa Saaban, "The Impact of Wave Blocking from Ship Hulls on the Stability of Tg. Piai Coastline," International Journal of Environmental Science and Development vol. 7, no. 7, pp. 542-545, 2016.