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Assessment of flood Characteristics due to land use changes in Chueongju - Mushim river, Chungbuk

  • Crisisonomy
  • Abbr : KRCEM
  • 2015, 11(4), pp.187-207
  • Publisher : Crisis and Emergency Management: Theory and Praxis
  • Research Area : Social Science > Public Policy > Public Policy in general

Chang HyungJoon 1,  Lee, Hyosang 1,  조국희 1,  이무경 1

1충북대학교

Accredited

ABSTRACT

The changes of land use influence on the flood characteristics, which depend on rainfall runoff procedures in the catchment. This study assesses the changes of flood characteristics due to land use changes between 1997, 2005 and 2018. The catchment model(HEC-HMS) is calibrated with flood events of 1990s and 2000s respectively, then the design rainfall of 100,200,500 year return period are applied to this model, which represent the catchment in 1990s and 2000s, to assess the flood peaks. The results of comparison between 1990s and 2000s shows that the flood peak of 2000s is increasing and time to peak of 2000s is decreasing comparing to those of 1990s :3% to 7% increase in flood peak and 10.2% to 16% decrease in time to peak in 100year return period flood. It is due to decreasing of the farmland area(2.18%), mountainous area(8.88%), and increasing of the urbanization of the area (5.86%)). This study also estimates the effects of the recent housing development plan in Cheongju, 2018. The effects of this plan shows that the increasing of the flood peak and time to peak comparing to 2000s. However, the effects on flood characteristics is marginal compared to 2000s: flood peak increasing of 0.23 to 0.73% in 100 year return period. These results of the study can be used for basic data of further studies related to flood management at Mushim river.

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