HULHULE-MALE’ BRIDGE PROJECT

EIA for the proposed Hulhule-Male’ Bridge Project
It can be seen from Figure 6.1 that, the characteristics of tidal current closer to the channel
opening before and after bridge construction remains almost unchanged. Thus, the construction
would not cause any change to the characteristics of tidal current.
To further compare the change characteristics of flow field in the project area before and after
the engineering construction, Figure 6.2 shows the distribution of flow velocity variation before
and after the construction. The results show that during flood tide, affected by the resistance of
pier, the flow velocity in Gaadhoo Koa slows down, falling by 0.02 - 0.05 m/s. The flow velocity
at the south of approach bridge pier close to Malé varies moderately and the maximum reduction
of flow velocity after construction is 0.18 m/s. The reduction of flow velocity around the other
main bridge piers and approach bridge piers ranges from 0.10 to 0.15 m/s. The variation of 0.02
m/s of the flow velocity of flood tide may influence the upstream and downstream within the
scope of 1.50 km.
During ebb tide, the region of flow velocity variation is mainly located close to the bridge line
and at the opening of Gaadhoo Koa. Due to the influence of bridge pier, the flow velocity
presents a long striped reduction belt along the ebb tide flow path. The variation of 0.02 m/s of
the flow velocity may influence the area towards the north of bridge location within a distance of
2.40 km. The maximum reduction of flow velocity of falling tide close to bridge pier is about
0.18 m/s.
Dhoonidhoo
Dhoonidhoo
流 速 变 化 (m/s)
流 速 变 化 (m/s)
Funadhoo
Hulhumale
0.14
0.12
0.1
Funadhoo
Hulhumale
0.08
0.06
0.08
0.04
0 0.2 0.4km
Male
0.06
0.04
0.02
0
-0.02
-0.04
-0.06
-0.08
-0.1
-0.12
0 0.2 0.4km
Male
0.02
0
-0.02
-0.04
-0.06
-0.08
-0.1
-0.12
-0.14
-0.14
-0.16
-0.18
-0.16
-0.18
(a) Flood tide
(b) Ebb Tide
Figure 6.2 Variation Diagram of Flow Velocity after the Bridge Construction
Due to the blocking of pile foundation against the water flow and reduction of wetted crosssection
area, the section flows reduces. The maximum flow of rising tide during the drastic
rising of tide reduces by 5% from 31,008 m 3 /s to 29,400 m 3 /s; it decreases about 5%. While the
Prepared by: CDE Consulting & China Shipping Environment Technology
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