navigable clearance 中文意思是什麼

navigable clearance 解釋
通航凈空
  • navigable : adj. 1. (河湖等)可航行的,可通船的。2. (船)適于航行的,耐航行的。3. (氣球等)可操縱航向的;適于航空的。n. 〈罕用語〉飛艇。n. -bility 適航性。adv. -bly
  • clearance : n 1 清除,掃除,除去;解除。2 【林業】終伐;(伐去樹木后的)林間空地。3 出[入]港證;放行證;出入...
  1. Before the construction of bridge over navigable rivers, esp. on the reach of complicated topographical and flow conditions, factors such as bed evolution, bridge site ' s choice, clearance dimensions, navigation condition and safety - ensuring measures, etc. shall be studied

    摘要在通航河流,尤其是在橋區地形、水流條件復雜河段處進行橋梁建設前,必須對河床演變、橋位、凈空尺度、通航條件和安全保障等因素進行論證。
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