HULHULE-MALE’ BRIDGE PROJECT

EIA for the proposed Hulhule-Male’ Bridge Project
Original Topography
10m behind Bridge
26m behind Bridge
42m behind Bridge
Figure 6.9: Wave Height Comparison at Different Locations Behind the Bridge Location (Wave for Two Year Return Period
on Designed low Water Level )
The results of the experiment show that the wave height distribution changes before and after the
construction is not significant. The wave height after project slightly decreases by 2% behind the
piers. In the case of designed low water level, the changes to wave height are relatively less
because the wavelength in the area is longer and the piers have little effect on the wave.
The experiment shows that bridge has limited impact on wave propagation and that the waves
propagating beyond the bridge piers have no significant change.
6.2 Impact on marine water quality
6.2.1 Impact and mitigation measures during construction period
6.2.1.1 Impact on marine water quality during construction
(1) Increased turbidity and suspended solids in marine water is one of the adverse impacts
anticipated during the bridge pier foundation construction. These impacts will be short term
and limited to the vicinity of the project site. The magnitude of suspended matter increase
and impact scope is directly related to construction method. In the comparison and selection
scheme of bridge pier foundation for this project, the caisson foundation scheme having
great disturbance to seabed was abandoned, and the pile group foundation scheme was
selected. More specifically, integral steel casing scheme was adopted for construction of
main bridge foundation, and the steel trestle and steel casing scheme was adopted for
construction of approach bridge foundation. Therefore, the significant disturbance on seabed
Prepared by: CDE Consulting & China Shipping Environment Technology
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