Please enable JavaScript.
Coggle requires JavaScript to display documents.
LU2: LAND RECLAMATION - Coggle Diagram
LU2: LAND RECLAMATION
Define
The process of reclaiming land by elevating the elevation of a waterbed or low-lying land or pumping water out of muddy marsh areas.
-
Impact of reclamation
-
-
The impact on dynamic condition of the water- As a result of the hydrodynamic changes in the environment caused by reclamation, the terms "water area" and "coastline length" were adopted to characterise this effect, with the shift in inter-tidal area being the most representative.
The impact on marine erosion and deposition conditions “tidal water” and “water exchange capacity” can reflect the influence, and tidal water in which needs to be calculated
-
-
Method
Infilling method - Filling the space with massive volumes of heavy rocks and/or cement, then filling with clay and mud until the desired height is obtained
-
Deep Cement Mixing -used where the material displaced by dredging or draining may be polluted and hence must be confined.
-
-
Techniques
Hydraulic Reclamation Method
- suitable for granular
- not suitable for too shallow seabed
- Used for filling from an offshore source, rehandling pits, and dredgers.
Dry Method
- Filing procedures for material from land sources, particularly rock, hillcut, and clay fill
- Filling the space with massive volumes of heavy rocks and/or cement, then filling with clay and mud until the desired height is obtained
Direct Dumping
- Used when the seabed is deep or the underlying seabed soil is soft
- By opening the bottom of the barge, fill material is deposited at a preset area.
- use not only for granular materials, but also for stiff and soft clay.
- used for 6-8m depth seabed
Rehandling pit Method
- It involves transferring sand by barge and temporarily depositing fill materials like as clay or rock in the pit for storage.
- It dredges sand from borrow sources with a single cutter suction hopper dredger before transporting it to the re-handling pit.
Sand spreading Method
- Spreading sand over water with a sufficient water level above the bottom causes each grain to descend slowly through the water and land gently on the seabed.
Advantages
-
More land, buildings, and infrastructure can be constructed.
-
-