HULHULE-MALE’ BRIDGE PROJECT

EIA for the proposed Hulhule-Male’ Bridge Project
Water level
tide level
-0.51 m
Recurrence
interval
(years)
300 200 100 50 20 10 2
B2 3.56 3.46 3.29 3.13 2.87 2.65 2.07
B3 3.78 3.67 3.5 3.33 3.05 2.82 2.19
B4 4.1 3.98 3.8 3.62 3.32 3.07 2.39
B5 3.5 3.43 3.28 3.13 2.88 2.63 2.08
W 3.87 3.75 3.58 3.40 3.11 2.88 2.24
Tm 15.9 15.8 15.4 15.1 14.7 14.3 13.4
According to the results, the proposed project site present the characteristics of low to moderate
wind, high and strong waves, and long wave periods.
• The site receives a mix of swell and wind waves. Swell waves approximately 2.0 m at
high tide level and with period of 8~10s exists at the bridge location without wind waves.
The wave mainly approaches from a SSE~ESE direction. Wave approaching from SE
direction is predominant (72.8% of annual frequency) followed by SSE direction (21.4%
of annual frequency).
• The analysis from mathematic model calculations shows that the wave height at open
ocean is higher than that of project site. The wave period also increases slightly closer to
the project location with an observed difference between 0 and 0.5 s. The incoming
waves are also refracted around the reefs of Hulhule and Hulhumale’ Island.
• It can be seen from the wave height distribution in the vicinity of this project that waves
in SE and SSE direction make the strongest influence on the bridge location. Under the
combined condition of the wave recurrence interval of 300 years and the corresponding
high water level, the maximum effective wave height Hs of the control point along the
bridge site is 4.17 m with the corresponding wave height H 1% of 5.94 m. The maximum
wave height is expected to be experienced at site B4 (Raalhugandu area) to the west side
of the bridge.
• The wave heights outside the atoll reef pass at point W (just outside Gaadhoo Koa)
varies slightly. The wave height is almost equal in W point and B4 point along the bridge
site. Under the condition of the wave recurrence interval of 300 years, the effective wave
height of this control point is 4.12 m and the corresponding water height H 1% is 6.05 m.
Prepared by: CDE Consulting & China Shipping Environment Technology Page| 64