Journal of Japan Society for Safety Engineering

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It　was　considered　that　land　deformation　influenced　on　wind　shift　around　the　development　area．The　authors　made　a statistical　study　on　the　influence　of　topography　upon　the　wind　directions　at　the 83 meteorological　stations　in　the　northern Tohoku　district，It　was　recognized　that　the wind　directions　at　some　meteorological　stations　in　mountainous　region　were affected　by　the　surrounding　topography．It　was　investigated　the　correlation　between　the　wind　direction　frequencies　and　the deviations　of　inclination．It　was　concluded　that　the　topography　within　the　area　of　l　or 2 km radius　affected　the　wind directions．It　was　obtained　the　next　quantitative　formulae　between　the　maximum　frequencies　of　the　wind　directions（F：％）and　the　deviations　of　inclination　of　the　same　directions（κ）， F₁=-190.8K₁十24.43（on　the　area　of　l　km radius） F₂=-186.7κ₂十23.61（on　the　area　of 2 km－radius） It　became　possible　to　predict　the　charlge　of　prevailing　wind　direction　and　frequency　around　the　development　area　by the　use　of　these　formulae，The　case　study　was　conducted　at　the　quarry where　had　a　plan　to　be　mined out　the　whole mountain，It　was　predicted　that　wind　system　around　the　quarry　would　change　widely．

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In　this　work，small　scale　vapor　explosion　experiments　were　carried　out　by　droplets　of　molten　LiCI　and　molten　Sn　falHng into　water，and　the　factors　which　affect　the　strength　of　the　explosion　pressure　were　examined．From　results　of　the experiments　and　those　of　other　workers，the　strength　was　found　to　be　expressed　by　using　the　surface　tension，the　thermal exergy，the　volume，the　diffusivity　and　the　temperature　of　the　hot　substance，difference　between　the　initial　temperature　of the　hot　substance　and　water，the　coefficient　of　viscosity　of　water　and　the　thermal　diffusivity　of　water．

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