Issue 12

A. Namdar et alii, Frattura ed Integrità Strutturale, 12 (2010) 57-62; DOI: 10.3221/IGF-ESIS.12.06 61 The mangrove root shape (Fig 5 ) is similar coarse aggregate, this shape increases soil foundation bearing capacity and tree stability and this could control land slide, deformation, settlement and increases soil cohesion which is needed in standing of trees subjected to dynamic force. The mangrove root strength can be find from laboratory experiments: the process is statistic and experimental is similar to approach other construction material such as steel. The advantage of coastal area is mangrove root not affect to any structure foundation. Density of mangrove jungle is depending on plan the height of mangrove could be reach average up to 15 ft, all assumption can be lead to reach a hypothesis for considering jungle as a solid area in wave height reduction. Another idea about mangrove in tsunami mitigation is similarity to dense wall installed in subsoil for reduction of dynamic stress created under shaking table function this method reduces soil deformation mitigation as well as seismic force. The mangrove root function in tsunami is simulate soil nailing or micro pile in ground stabilization and improvement, this reduce all kind of geotechnical problem faces subsoil during the tsunami, this is simulate of passing vehicle on the subsoil which create of dynamic force at any moment. The mathematically calculation water self weight shown in Fig. 6, it is exhibited reducing the lateral pressure of water in the static position if area have been under plantation, it is clear the tsunami is in the dynamic form, and need of calculation of tsunami speed reduction, it has direct correlation with strength, diameter, root, height, density and body tree. The soil texture has independently affect in stability of tree which soil consists of clay mineral with high level of cohesion helps in standing tree submitted to the dynamic force. 40,71 1*57*40.71=2320.47/2=1160.24 Kg 1160.4*19=22044.56 Kg/m 50 Total Bending Moment 1750*23.33=40827.5Kg/m Total Lateral Pressure 1*70*50=3500/2=1750 Kg 70 Plantation Area 57 Total Bending Moment Total Lateral Pressure Figure 6 : Water force model before and after plantation. The figures 7-9 are shown different types of mangrove. Due to creation of jungle, the urban area take advantage of approaching better environment, The another advantage of this urban design method is to have an attractive tourist place with job creation and it lead to improve of economically development of coastal region. In the coastal territory with land shortage for green belt, this method is applicable and will have significantly affect on maintain of climate which is one of the important problem in recent century society faces. Figure 7 : Mangrove tree in coastal area.