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An Examination of Optimum Slit Aperture Suited to Flat-board Debris-flow Breaker in Residential Piedmont Areas

  • Crisisonomy
  • Abbr : KRCEM
  • 2016, 12(4), pp.73-83
  • Publisher : Crisis and Emergency Management: Theory and Praxis
  • Research Area : Social Science > Public Policy > Public Policy in general

Kim,Jin-Hak 1,  Chun Kun Woo 2,  Kim, Sukwoo ORD ID 2,  Kye-Won Jun 2,  윤주웅 2,  JUNG IL SEO ORD ID 3

1경상대학교
2강원대학교
3공주대학교

Accredited

ABSTRACT

This study examines how to derive an optimal slit aperture of flat-board debris-flow breaker (hereafter FDB), which is a new method for reducing damages by debris flows in residential piedmont areas. The results show that FDB divided momentarily debris flows into water and bed-materials, thereby inducing storage of the (especially with large grain-sized) materials and causing potentially huge damages. In addition, with increasing slit aperture, the amount of large grain-sized materials increased under the lower surface of FDB, which reflects inversely that, under the consideration that FDB requires obligatorily dredging works, FDB with the slit aperture equal to mean grain-size of bed-materials is effective for capturing debris flows. However, on the upper surface of FDB with the optimum slit aperture, its considerable amount was dropped out to both sides of FDB. This finding indicates that a pile of the materials formed on the upper surface of FDB changed flow direction of the materials arriving at the heels of the pile.

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