STUDI EROSI TEBING PANTAI DI KOTA MANNA, KABUPATEN BENGKULU SELATAN
This study explains the erosion process on Manna City coastal cliff toe caused by waves and tidal activities, and also simulates the erosion on Manna City coastal cliff toe on 2007- 2016. Manna City coastal cliff is consisted of sedimentary rocks and is one of the most actively eroded cliff in In...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/45348 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | This study explains the erosion process on Manna City coastal cliff toe caused by waves
and tidal activities, and also simulates the erosion on Manna City coastal cliff toe on 2007-
2016. Manna City coastal cliff is consisted of sedimentary rocks and is one of the most
actively eroded cliff in Indonesia. Mathematical models are used to calculate the erosion,
using breaking wave height, wave period, tidal elevation, and cliff material strength as input
data. Wave period and height are calculated using Svredruv Munk Bretschneider (SMB).
Then, wave height is converted into breaking wave height with an assumption that the wave
period is constant.
Simulation is done on four scenarios using an empiric cliff erosion equation caused by
plunging and spilling breaker type. Cliff erosion model is shown as a 2 dimensional mode
in a vertical (z) and beach perpendicular (y) direction. This model uses an elevation grid
(dz) in a vertical direction of 0.1 m mean sea level (MSL) value of 0 m as an elevation
reference, time step (dt) of 6 hours, and clff material strength (R) of 1,5x106 m9/4 det3/2. This
model assumes that there are no cliff failures and all eroded sediment goes back into the
sea. The result of this model shows an erosion distance of 10.31 m for spilling breaker and
51.78 m for plunging breaker from 2007-2016. |
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