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|Other Titles:||A Study on River Channel Change of Chianan Coastal Plain, Southwestern Taiwan|
Department of Geography, NTNU
Rivers in the coastal plain in southwestern Taiwan are notable for their meandering channels and high sediment yields. Two major rivers in this area, the Pachiang and the Tsengwen River, have avulsed five and four times, respectively, in the typhoon season by rapid sedimentation over last three hundred years. The shifting distance of channel avulsion, from north to south, for both rivers are more than 20km. However, these channels have been more stable due to the protection of river banks since 1920's. Responding to the coastal progradation, the rivers have lengthened westward. The river mouth of Chishui River, for example, has migrated 43 m/yr in average from 1904 to 1990. The river change of this area has exerted some impacts on people's life, such as the village relocation to avoid the river bank erosion, the decline of ship ports, and the confusion and controversy of the administrative boundaries. In contrast, human action, such as the construction of irrigation canals and dams and channel cutoff, have also caused impacts to the nature of river channels. Obviously, the river change and the human behavior has been interrelated closely to each other over last three hundred years.
|Appears in Collections:||地理研究|
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