Centurial modification of river channels and its implication on flooding in Taiwan - An anthropogenic geomorphology perspective

Authors: Mu-Ti Yu*, Department of Geography, National Taiwan Normal University, Su-Min Shan, Department of Geography, National Taiwan Normal University
Topics: Geomorphology, Anthropocene, Coupled Human and Natural Systems
Keywords: channel system modification, historical maps, aerial photographs, anthropogenic geomorphology, Taiwan
Session Type: Paper
Day: 4/10/2018
Start / End Time: 10:00 AM / 11:40 AM
Room: Balcony K, Marriott, River Tower Elevators, 4th Floor
Presentation File: No File Uploaded

Taiwan, a mountainous island, is highly sensitive to the dynamic geomorphic processes mainly driven by the active tectonics and extreme climate events. Along with the rapid population growth (ca. 23 million now) and the strong development-oriented national policies, all major river channels around the island have experienced dramatic modification during the 20th century. Apart from the significant channelization, channel systems in the lowlands have also been modified extensively to fulfill the need of irrigation, regional drainage and flood prevention. The current study aims to detect and categorize the major patterns of channel modification around the island by comparing the sequential historical maps and aerial photographs over a centurial timespan. Selected cases are used to demonstrate how the transformed lowland channel systems have affected the spatial pattern of flooding at a local scale.

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