(Erosion Prediction in Ungauged Basins: Integrating Methods and Techniques (Proceedings of Symposium HS01 held during IUGG2003 at Sapporo, July 2003), IAHS Publication No. 279, 2003, pp. 162–170).
Land development and urbanization have increased significantly in Taiwan over the last two decades because of the increasing population and economic development. The ungauged Ta-Chau basin, which is representative of drainage basins undergoing these changes, was chosen to investigate the effects of landuse change on surface runoff. Supervised classification of Landsat MSS and SPOT satellite images was used to show land-use change from 1972 to 2000. During this period, the area of impervious land increased by approximately 220%, and the area occupied by rice paddies decreased by about 55%. Results from a distributed rainfall-runoff model reveal that the observed land-use change causes increases in both peak discharge and total runoff. For design storms having return periods ranging from 10 to 200 years, peak discharge increased from 6 to 10% and total runoff increased from 10 to 17%. The methods outlined may be used to investigate the effects of land-use change on runoff response in ungauged basins elsewhere.
Geographic information systems, Landuse change, Rainfall-runoff model, Remote sensing, Ta-Chou basin, Taiwan, Ungauged basin
