| Title | Field Investigation and Numerical Simulations on Sediment Transport in Kaohsiung Coastal Area(1/2) |
| Dept | IOT |
| Year | 2003 |
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| Summary | Published in March 2003 IOT SERIAL No.92-26-742，274pp. This is a two-year collaborative project, mainly consisting of two parts. One is field investigation on sediment transport along Kaohsiung coasts. The other is Numerical Simulation on sediment transport in Kaohsiung coastal area. The first part is performed by the Department of Civil Engineering, National Taiwan University, and the other one is performed by the Center of Harbor & Marine Technology, Institute of Transportation. This is the final report of the first year. According to the results of field observation quoted in other relative reports and our numerical simulation, the major part of flow in this area is due to the effect of tides, currents and typhoons. The tidal current, whose maximum magnitude is about 1 nautical mile per hour, is periodic and mainly flows along the coastal line. The result of numerical simulation shows that the variation of tidal current among the space is little. After a long-term simulation or observation, the direction and magnitude of permanent current can be obtained. Though the magnitude is relatively small, it acts on the field constantly, and is suspected to be one of the driving forces raising the sediment to move. Typhoon is another force that causes the sediment transport. As the phenomena of typhoon is complex, and the waves during typhoon seasons are extremely high, the simulation or observation of typhoon effect to the sediments becomes much more difficult. Nevertheless, the simulation of the long-shore current driven by typhoon is performed in this project and has a reasonable result. According to the result of the grain size analysis and mineral component analysis, the sands on the beach in Kaohsiung coastal area and in Koaping River are similar to each other and worse than those in Ernjen River. And, the silts on the beach in Kaohsiung coastal area and in Koaping River contain more chlorite than those in other rivers. That is, the sediments along the beach in interesting area are much more likely to be moved from Koaping River than from others. |
| Post date | 2004/12/30 |
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