||The resources of the sediments at the bottom of sea floor for offshore seas at Taipei harbor is mainly from terrestrial origins. The process when the terrestrial sediments is floating from rivers to off-shores, the sediments’ floating is conducted by hydrodynamic influences of meteorology so that it affects the transmission and distribution of the sediments; however, the changes of terrestrial sediments, currents, wind and waves are the factors to affect the transmission and distribution of the sediments. The propose of this study is making use of the long-term changes of hydrodynamic influences of meteorology and bathymetric topography to explore the bathymetric topography of offshore seas at Taipei harbor that is affected by the changes of hydrodynamic influences of meteorology.|
The data used in this study are from the investigations of alongshore drift meteorology hydrology and topography changes monitoring at Taipei Harbor. Those data include the depth measurement of bathymetric topography, currents, wind and waves. The period of time series data is between 2006 and 2010.
The results of the analyses showed that (1) the northeast depth of water 10-25 meters are ersion, but deposition with 10 meters during the period of southwest monsoon. And southwest parts of this study area are erosion at the same climate conditon; but the opposite situations happen during the period of northeast monsoon. (2) the currents correlate weakly with winds ; winds correlate well with waves. (3) the large action between the higher wave and stronger current will affect the sediments moving. So wind is the most major factor to affect the transmission and distribution of the sediments at Taipei Harbor. (4) the moving routes of typhoons in 2010 are the category seventh and ninth . There is no obstruction by Central Mountain Range, the strong currents made the sediments move that showed the erosion phenomenon. (5)if the times of the interactions between strong waves and currents are more during the period of southwest monsoon, the deposition of the northeast part of this study area will reduce but the erosion of the southwest part will get increased; however the less times of the interactions will make opposite results. And the results during the period of northeast monsoon showed the opposite of happening during southwest monsoon. (6) the erosion of the northwest part of this study area during the period of southwest monsoon is supplied by any amount of the deposition that happened during the period of northeast monsoon; and the southwest part of this study area is deposited during the period of northeast monsoon, but there is the erosion gotten along the coastal part. With the long-term observation, there is the deposition phenomenon in bathymetric topography at Taipei Harbor, and the erosion phenomenon along with the coastal line.