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KMID : 1024520150240040425
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Journal of the Environmental Sciences
2015 Volume.24 No. 4 p.425 ~ p.435
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Flood Discharge Analysis on Land Use Changes in Han Stream, Jeju Island
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Yang Se-Chang
Yang Sung-Kee
Lee Jun-Ho
Jung Woo-Yul
Ko Kwang-Hyo
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Abstract
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A number of projects for development have been done continuously due to the increase of tourist in Jeju Island. However flood disaster countermeasure due to urbanization is not considered during this development projects. This study is to make basic process for the flood estimation in Han stream of Jeju Island. The variation of stream discharge due the every 5 years' land use change from 1980 to 2005. Data for flood events (rainfall and discharge) were collected for HEC-HMS model. Clark method was used for unit hydrograph analysis. For the estimation of Clark unit hydrograph parameters, Kraven II and Sabol's empirical equations were applied. The peak discharge increased 9.9~33.67% and total discharge amount increased 12.53~30.21%. Also, time of concentration for peak discharge was reduced by 10 minutes for each event.
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KEYWORD
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HEC-HMS, Land use, Han stream, Clark
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