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Reduction of Tractive Force by Revetment Mattress/Filter

호안 Mattress/Filter에 의한 소류력 저감

  • Seo Young-Min (Department of Civil & Environmental Engineering, Yeungnam University) ;
  • Lee Seung-Yun (Department of Civil Engineering, Kyushu University) ;
  • Heo Chang-Hwan (Institute of Disaster Prevention, Yeungnam University) ;
  • Jee Hong-Kee (Department of Civil & Environmental Engineering, Yeungnam University)
  • 서영민 (영남대학교 토목공학과) ;
  • 이승윤 (일본구주대학교 토목공학과) ;
  • 허창환 (영남대학교 방재연구소) ;
  • 지홍기 (영남대학교 토목공학과)
  • Published : 2006.01.01

Abstract

Revetment Mattress/Filter is the porous structure filled fillers in meshed structure so that it cail use the fillers of various sizes and form various pores. The porous structure of the Mattress/Filter increases drainage so that it decreases the energy and erosion of flow therefore the tractive force is decreased and the erosion of revetment is mitigated. The filler of Mattress/Filter uses gravels, waste concretes and slags so that the surface is rough and the roughness coefficient increases and the increase of the roughness coefficient decreases flow velocity and tractive force. On the other hand Mattress/Filter and vegetation are combined so that the increase of roughness coefficient and flow velocity still more progress therefore the effect of decrease of tractive force is increased after a few months have passed since the Mattress/Filter is constructed so that the vegetation is developed and be stabilized. The vegetation channel of Mattress/Filter is set tip and the inspection comes into operation by varing flowrate and vegetation spacing to examine these characters of the Mattress/Filter The coefficient of flow velocity U/U*' is decreased exponentially as vegetation esity aH' or $\lambda$ is increased and the coefficient of friction f is increased as vegetation desity aH' is increased but decreased as the coefficient of flow velocity U/U*' is increased. The effective tractive force $F_0$ is decreased exponentially as the vegetation desity aH' is increased. From the inspection the results are obtained that the porous and vegetation structure of the revetment Mattress/Filter system increases the coefficient of friction of revetment so that flow velocity and effective are decreased therefore greatly contributes the stability of the revetment.

Keywords

Mattress/Filter;Tractive force;Vegetation restoration;Revetment

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