Author(s): Hsiao-Wen Wang; Chung-Yi Lin
Linked Author(s):
Keywords: Channel evolution; River restoration; Formosan Landlocked Salmon (Oncorhynchus masou formosanus); Dam removal; Taiwan
Abstract: The Formosan Landlocked Salmon (Oncorhynchus masou formosanus) is known as the national treasury fish in Taiwan. This sensitive species has been designated as endangered, attributable to human alterations of the channel corridor that have reduced the quality of habitat. To reduce the impact from the check dams on increasing water temperature and population isolation, Shei-Pa National Park in 1999 to 2001 was conducting restoration actions on the Kao-Shan Creek, partially removing four dams to restore natural creek processes and enhance habitat for this endangered species. The habitat environment and the associated ecosystem have then been gradually improved after the conservation efforts, with the endangered fish population increases. River restoration of dam removals on Kao-Shan Creek is the first and the only one case in Taiwan. The experiences here can provide valuable lessons for future projects. To assess the effects of these actions function and understand the geomorphic responses to dam removals, a long term monitoring program on channel form has been conducted, including cross-sections, long-profile, and facies map. The post-project survey showed significant changes in the stream channel following the high flow events. The survey results then enhance better understanding of the factors leading to channel change and thus develop a more sophisticated assessment of opportunities and constraints for restoration for the specific river.
Year: 2009