양평 수입천 중상유 하상 지형에 대한 연구 = The Channel Bed Forms of Suip Stream , Yangpyong , Kyonggi Province

다국어 초록 (Multilingual Abstract)

The purpose of this study is to discover out the characteristics of the channel bed forms in Su-ip stream, Yangpyong, Kyonggi province. Channel bed form reflects the characteristics of the flow and sediments which are transported by the stream, and the interaction between the fluvial systems and its environments.
The study was restricted to the areas consisting of bed rock cliff and talus slopes, in lateral movement of the channel. Bed-rock channel and gravel-bed channel can be differentiated between by its forming material and the material supply from the slope, nearest to channel, effected to channel bed forma.
A series of field measurements reveals that the riffle-pool sequences were formed in studied reach, but the regularity, reported by other researchers who studied the gravel-bed river, was not found at all. The irregularity of the riffle-pool sequences in this reach were caused by the large bed rock obstacles from the slopes. The step-pool sequences, which dissipate the fluvial energy and minimize the stream power per unit area, were found, and all of them were formed by the bed rock.
The material size of the riffle period is larger than that of the nearest pool and run period. It can be regarded as not only the geometric feature of the channel bed, but also the spatial sorting of the bed forming material. So, the riffle period includes the roughness elements, increased resistance to the flow.
In the run period, the armoured layer was found to be not a static armour, but a dynamic armour, which moves downstream during a flood.
In this reach, if combined with the riffle, the mid channel bar and the point bar were found. And the material size of the bar is smaller than that of the nearest riffle period. According to the material size characteristics, the bar does its role as a temporary sediment storage. The cluster bed form was found on the surface of the bar and shut stream.
The bed forms like the riffle-pool sequences and the bar, and are combined with the large bed rock obstacle that is transported from the nearest slope.
According to these results, the channel bed form characteristics of this reach strongly influenced by the material transport from the slope.