淸道川 변에 分布하는 자갈에 對한 調査硏究 = A Study on the Gravels Transported by Ch'??ngdo Stream

다국어 초록 (Multilingual Abstract)

An analysis of frequency distribution, indicates that gravels in the Ch'??ongdo stream are mainly consist of andesitic volcanic rocks, granite and quartz porphyry in frequency. This occurrence frequency of rock each is well matched with the distribution area of each rock in the geologic map from the present erosion level. Rock type of gravels can be classified into andesite, andesitic porphyry, breccia bearing andesite, quartz porphyry and tuff.
The distribution of gravel size suggests that the occurrence frequency of boulder and
cobble is systematically changed toward the downstream, whereas that of pebble is
randomly changed. The roundness of gravel is distinctly changed and is higher in the
downstream site than in the upperstream site. The occurrence of angular gravel is
relatively dominant than that of rounded gravel. This doninant angular gravel is due to
either the poor current quantity of stream or the rocks transported from the near
provenance of rocks.
The geological material discussed here are recommended as the learning material for
the observation and classification of gravels in 'rock and soil' unit of science textbook.

목차 (Table of Contents)

• Ⅰ. 序 言
• Ⅱ. 地形과 地質
• Ⅲ. 岩石의 分類基準
• Ⅳ. 調査 및 結果 考察
• Ⅴ. 結 言