The evolution of the Namaxia debris-dammed lake: Field surveys and Narrow flume experiments
Date Issued
2012
Date
2012
Author(s)
Lin, Yan-Ting
Abstract
Using field surveys and laboratory experiments, the present study examines the evolution of a debris-dammed lake in montane Taiwan. During Typhoon Morakot in August 2009, a tributary called Creek No. 2 supplied abundant debris to its confluence with the Chishan River, causing the formation of Namaxia Lake. To document the subsequent evolution of the debris-dammed lake, two surveys were conducted in January 2011 and February 2012. In particular, long profiles were measured and the distribution of fine and coarse sediment material was observed. To model the river response observed in the field, experiments were conducted in a narrow flume. Different runs examined the influence of initial slope, tributary influx, and fine sediment concentration. Initial slope and tributary influx are found to greatly influence the observed long profiles. Fine sediment concentration, by contrast, exerts little influence on long profiles, but affects the composition of lake deposits and the duration of lake existence. By adjusting these experimental parameters, it is possible to obtain river responses similar to those observed in the field.
Subjects
debris-dammed lake
Namaxia
Chishan River
field surveys
laboratory experiments
Slope
Concentration
Tributary influx
Type
thesis
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