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抛石护岸工程水下抛石效果评价是工程水下质量控制的重点和难点。准确掌握和分析工程水下质量状况,对确保抛石护岸的施工质量起到了重要作用。GIS(地理信息系统)技术拥有强大的空间数据处理与分析能力,可用于对水下抛石效果进行多维度的定性与定量分析。分析结果可以准确评价施工质量、精准指导下一阶段施工、降低施工成本。通过对3个试验区的分析,总结出一般施工规律:1)由于工程区上游起始处以及下游深水侧容易产生冲刷,抛石效果较差。2)工程区中部及近岸区抛石效果较好,但容易过抛。 相似文献
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船舶发生海难事故,需要选取最适合的救助力量开展救助工作,海上恶劣的环境和搜救时间的紧迫性,对选取救助船有很高的要求.文章以水上人命救助为背景,从岸基专业救助船优选角度出发,分别构建两种模型:层次分析法(AHP)、加权和法相结合的优选评价模型,组合赋权、理想解排序法(TOPSIS)相结合的综合评价模型,通过实例将以上两种... 相似文献
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A flow-dependent critical-point method for investigating topographically controlled flow in natural channels is applied to the bottom current through the Irbe Strait connecting the Baltic proper and the Gulf of Riga. This approach is based on the functional formalism due to Gill [Gill, A.E., 1977. The hydraulics of rotating-channel flow. J. Fluid Mech., 80, 641–671.], and here is used for the stratified flow structure observed during the IRBEX-95 field campaign. A critical section of the realizable flow regime was found to be located slightly downstream of the most pronounced horizontal constriction of the channel. The predicted baroclinic volume flux 7200 m3 s−1 overestimates the observed mean bottom-water transport by around 30%, a discrepancy which most likely can be explained by the lack of sea level conditions and friction in the model. 相似文献
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琼州海峡悬浮隧道的可行性研究 总被引:3,自引:0,他引:3
随着海南经济的不断发展 ,琼州海峡的交通流量将越来越大 ,因此修建固定式跨海通道将成为不可回避的问题。本文在收集琼州海峡大量气象、水文、海况和地质资料及对国内外悬浮隧道研究现状进行分析的基础上 ,提出在琼州海峡修建悬浮隧道的初步设想 ,并对其可行性进行了探讨 相似文献
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中国至澳大利亚航线是我国远洋船舶经常航行的航线,作者结合对澳大利亚各港航行的实践经验,参考有关航线设计资料,从中总结出4条主要航线及其航行注意事项。 相似文献
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Tianhang Gao 《Maritime Policy and Management》2013,40(6):669-686
ABSTRACTStraits and canals have always served as key nodes in shipping networks. The blockage of a strait or canal will lead to ship deviations and increased transportation costs. To measure this impact on the Chinese fleet, our study develops a mathematical model that is based on a programming formulation. Each strait or canal is assumed to be blocked in turn, and the increased transportation costs for the Chinese fleet in different scenarios are calculated and compared using the proposed programming formulation in order to measure the impact of the blocked strait or canal on the Chinese fleet. Larger increases in transportation costs have greater impacts on the fleet. The results show that a blockage of the Strait of Hormuz would have the greatest impact of all straits and canals; it would cause the Chinese fleet to lose a portion of its import and export market, and such a blockage cannot be addressed through ship deviations. Based upon increased transportation costs, the four straits or canals that would have the greatest impact if blocked are the Mandeb Strait, the Suez Canal, the Sunda Strait and the English Channel. 相似文献
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跨越琼州海峡铁路隧道施工方案刍议 总被引:3,自引:0,他引:3
琼州海峡跨海工程是粤海铁路必经之路,无可绕避。根据对琼州海峡自然条件状况资料的分析以及对国内外已修建的部分大直径盾构法水下隧道的调研,采用盾构法修建琼州海峡铁路隧道是较为合适的。在此基础上,提出了对建设跨琼州海峡铁路隧道的初议和几个跨琼州海峡的铁路隧道工程的方案以及与桂海铁路相关的意见。这将对跨琼州海峡这一项“世界级”工程的建设,提供参考和借鉴。 相似文献
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本文就目前海峡两岸海上客运直航问题,提出了“特别直航”的建议。在分析了客运船型、港口及航线经济效益后,得到了有益的结论。 相似文献
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跨海火车客滚船机动性探讨 总被引:1,自引:0,他引:1
利用船舶机动性的概念及机动性指标,说明火车滚装客船具有良好机动性的必要性,从我国第一艘跨海火车渡船的设备配备性情况说明跨海火车渡船船舶动力装置设计上考虑操纵机动性的特点。 相似文献