The Study of Bed-Materials of Riffle and Pool－A Case Study in Chinkualiao Stream
Date Issued
2007
Date
2007
Author(s)
Kuo, Cheng-Wei
DOI
zh-TW
Abstract
Abstract
The studies of riffle-pool sequence have developed in the 1960s. In the last few years, because the ideas of river restoration start, the studies of riffle-pool become more important. In this research area, the river bed morphology of riffle-pool sequence and the differences in characteristics of bed materials always interest the researchers. There is concurrently academic and application value in bed materials research. The studies of streams in Taiwan comparatively lack the foundation investigations in bed materials, so this research hopes to understand the differences in bed materials characteristic between riffles and pools by sampling investigation. The purpose of this study is to compare the bed materials characteristic between riffles and pools, and to discuss the relationships between bed materials characteristic and the river bed morphology. The river bed materials characteristic contains the particle size, flatness and roundness. The research area - ChinKuaLiao stream - is in the PingLin Township in Taipei County.
The results reveal that the bed longitudinal variations and the particle size have better corresponding relations in well-growth riffle-pool morphology. By the T- test, particle sizes in pools are coarser than riffles in the five of ten sample zones. Flatness is varies along with the river channel characteristic, and roundness in most riffles is bigger than pool. In the bivariate scatter plots results, it is most clear to separate the characteristic of riffles and pools by the mean particle size vs. skewness. In the cumulative size frequency distributions plots, the φ50 distribution in riffles is obviously more convergence than pools. This reveals there are great differences in bed material size distribution between pools.
Subjects
淺瀨
深潭
河床底質
河床地形
riffle
pool
bed materials
river bed morphology
Type
thesis
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