韓國에 있어서 嵌入曲流切斷의 地形 發達 = Geomorphic Development of Incised Meander Cut-off in Korea

다국어 초록 (Multilingual Abstract)

The purpose of this study is to make clear geomorphic development of incised meander cut-off.
The summaries and main conclusions are as followes ;
1. The total number of incised meander cut-off is 113. Incised meander cut-off are intensively distributed on the western slops of the T'aebaek and Sobaek mountain ranges, but sparsely distributed on the opposite slopes. The occurrence rate of incised meander cut-off by the rivers is high by the order of the Hangang, Nakdonggang, Kumgang. Especially, a distribution rate in the Hangang amounts to 43% in the whole.
2. Meander cut-off pattern is classified into two modes ; meander neck cut-off and stream capture. The former mode is made by the fact that geology, geomorphology and main stream restricted the lower shifting of meander belt, and the latter by the way that tributary channel has captured the main channel or vice versa.
3. The abanded channel by meander out-off is distributed much in the relative height of 11∼2Om, 31∼40m, 71∼8Om from the present river bed. These relative heights corrate to those of river terrace H_2, M, and L_l surfaces. Therefore, it is shown that meander cut-off forms well when the river terrace is formed.
4. That incised meander cut-offs in the Yongyang, Yongwol, Whanggan were formed in 41,530∼44,580yr,B.P. is clarified by radiocarbonic age dating. Therefore, it is estimated that incised meander cut-off occurred frequently to the Glacial epoch.
5. In incised meander cut-off, the geomorphic developments of abanded channel are as follows :
1) The initial stage : A water fall is formed in cut-off meander neck and the channel is not terraced yet. So it is flooded in flood season. The abanded channel can not be used as cultivated field.
2) The middle stage : Knick-point located on meander neck at the initial stage moves to the upstream and the abanded channel is heightened from present river bed and turns into river terrace. But the relative height of the abanded channel is not so high and the channel is flooded by extremly high water level of present stream and is deposited by suspended load. The longitudinal profile of the abanded channel becomes an asymmetry. The land of the abanded channel is chiefly used as rice field.
3) The last stage : Downward erosion of present stream continues and the relative height of abanded channel is heightened more and finally the channel is not flooded at extremly high water level of present stream. The profile of abanded channel becomes increasingly symmetry and the depositional mode changes from suspentional deposit to colluvium and fan deposit. At this time, the abanded channel is chiefly used as dry field.

목차 (Table of Contents)

• Ⅰ. 序論
• Ⅱ. 嵌入曲流切斷의 分布
• 1. 流域別 分布
• 2. 高度別 分布
• Ⅲ. 嵌入曲流切斷의 樣試
• 1. 曲流 頸部의 切斷
• 2. 河川 爭奪
• Ⅳ. 舊流路의 堆積構造
• 1. 平海 안넙품
• 2. 熊村 通川里
• 3. 黃澗 院村里
• 4. 英陽 三池里
• 5. 蔚珍 上泉洞
• Ⅴ. 嵌入曲流切斷의 地形 發達
• 1. 嵌入曲流切斷의 發生과 發生時期
• 2. 嵌入曲流切斷의 地形 發達 段階
• Ⅵ. 要約 및 結論