44-3대지.02이광률c

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1 Properties of Channel and Evolutions of Fluvial Terraces in Odae River Gwang-Ryul Lee* 1 3 OSL 1 MIS 2 2 MIS m/ka 0 269m/ka Abstract This study analyzes the properties of fluvial landforms in the upper and lower reaches and investigates the evolutions of stream and fluvial terrace in the Odae river basin. The lower basin of the river that consist of sedimentary rocks resistant to weathering and erosion processes shows higher altitude, relief and slope than the upper basin that consist of granite less resistant to weathering and erosion processes. The average width of river valley at the lower reaches is one-third to the upper reaches and the average width of river channel at the lower reaches is narrower than at the upper reaches. Based on the OSL age dating, the fluvial terrace T1 formed at the temperature-rising period during the late MIS 2 and T2 formed at the middle MIS 3, interstadial period during the last glacial period. Based on the these results, the average incision rates of Odae river are calculated as 0.205m/ka and 0.269m/ka at the upper granite area and lower sedimentary rocks area, respectively. : fluvial terrace, incision rate, difference of bedrocks, width of river valley, structure materials in riverbed 2006 Leopold et al Charlton 2008 (Assistant Professor, Department of Geography Education, Teachers College, Kyungpook National University), georiver@knu.ac.kr 224

2 Summerfield 1991 Strahler and Strahler 2005 Ritter et al Plummer et al Strahler and Strahler ArcGIS km OSL(Optical Simulated Luminescence) km km km 8 5km 27 5km 27 5km m 225

3 이광률 그림 1. 오대천 유역분지의 지형 그림 2. 오대천 유역분지의 지질 -`226`-

4 1 2 DEM ArcGIS 227

5 (m) (m) m 156m m 225m

(m) (m 2 ) (m) (m) 19 136 8 820 582 460 9 34 29 31 085 4 652 294 149 7

29 32 08 10km 10km 20km 30km 40km 50km 58km 45 25 0 29 21 15 50 68 34

6 (m) (m 2 ) (m) (m) km 6 20m m 149 7m km 55km 2 5km km 10km 20km 30km 40km 50km 58km mm 72 3mm 66 9mm 74 8mm 66 2mm 68 5mm 229

7 (point bar) km 45 30km 66 30km 40km 29 50km km 10km 50km 30km 40km 1 (T1) 9 (T9) km 37km 1 10km 14 30km 2 13km 16km 17km 20 22km 29km 32 34km 57km 3 15km 20 21km 34km 4 21km 49km km 31 34km 49km km 49km 7 31km km km 15 25km

8 km km 30 35km 2 231

9 km 20 32km 32 54km 54 57km 57 58km km km

10 20km 32 54km 11km 11 20km km 32 54km 233

11 1 cobble (matrix) OSL OD m 13 2 cobble 1 pebble OSL OD2 6m 234

12 15 3 pebble 2 4 OSL 1 OD OD MIS 2 2 MIS 3 (incision) Schumm m/ka m/ka m/ka m/ka m/ka 0 17m/ka m/ka m/ka 2007 OSL 1 OD1 14 1ka 4 3m 0 307m/ka 7 5m 0 536m/ka 2 OD2 42 3ka 8 6m 0 205m/ka 11 3m 0 269m/ka 235

13 (km 2 ) (m/ka) North California Central California Montana Wohl OSL MIS MIS m/ka 18 O 0 46m/ka 18 O 0 06m/ka 4 16 OSL 3 MIS 4 4 MIS 6 5 MIS 6 6 MIS 7 7 MIS 8 236

14 18 O MIS Bradley m 149 7m m 32 08m km 1 237

15 21 22km 30 35km 32 54km 11 20km 32 54km OSL 1 MIS 2 2 MIS m/ka m/ka m/ka m/ka 1 2 OSL 3 MIS 4 4 MIS 6 5 MIS 6 OSL OSL Bradley, R. S., 1999, Paleoclimatology, Harcourt/ Academic Press. Charlton, R., 2008, Fundamentals of Fluvial Geomorphology, Routledge. Leopold, L. B., Wolman, M. G., and Miller, J. P., 1992, Fluvial Processes in Geomorphology, Dover Publication. Plummer, C. C., McGeary, D., and Carlson, D. H., 2003, Physical Geology, McGraw-Hill, Boston. Ritter, D. F., Kochel, R. C., and Miller, J. R., 2006, Process Geomorphology, Wm. C. Brown. Schumm, S. A., 1999, Cause and controls of channel incision, in Darby, S. E. and Simon, A.(eds.), Incised River Channels: Processes, Forms, Engineering and Management, John Willey & 238

16 Sons. Strahler, A. and Strahler, A., 2005, Physical Geography, John Willey & Sons. Summerfield, M. A., 1991, Global Geomorphology, Prentice Hall, London. Wohl, E. E., 1999, Incised bedrock channels, in Darby, S. E. and Simon, A.(eds.), Incised River Channels: Processes, Forms, Engineering and Management, John Willey & Sons Correspondence: Gwang-Ryul Lee, Department of Geography Education, Teachers College, Kyungpook National University, Sankyuk-dong, Buk-gu, Daegu, , Korea ( phone: ) 239

42-1-03이광률OK*

42-1-03이광률OK* Analysis on Channel Morphology and Rock Resistance by Difference of Bedrock Types between Upper and Lower Reach Gwang-Ryul Lee* 6 GIS : Abstract The streams evolve to diverse forms influenced by various