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Presented here is a compact explicit difference scheme of high accuracy for solving the extended Boussinesq equations.For time discretization,a three-stage explicit Runge-Kutta method with TVD property is used at predicting stage,a cubic spline function is adopted at correcting stage,which made the time discretization accuracy up to fourth order;For spatial discretization,a three-point explicit compact difference scheme with arbitrary order accuracy is employed.The extended Boussinesq equations derived by Beji and Nadaoka are solved by the proposed scheme.The numerical results agree well with the experimental data.At the same time,the comparisons of the two numerical results between the present scheme and low accuracy difference method are made,which further show the necessity of using high accuracy scheme to solve the extended Boussinesq equations.As a valid sample,the wave propagation on the rectangular step is formulated by the present scheme,the modelled results are in better agreement with the experimental data than those of Kittitanasuan. 相似文献
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中国资源型景区旅游空间结构研究 总被引:50,自引:4,他引:46
选取国家旅游局评定的4A级景区中的509处资源型景区为样本景区,利用地理数学方法的空间分析手段和GIS空间分析工具,从定量和定性两方面分析资源型景区的旅游空间结构。结果表明,资源型景区的空间分布类型属于凝聚型,区域分布均衡性很低,省际差异较大;高密度区域为长三角地区、北京及其周边地区、以西安为中心的关中地区和以洛阳为中心的中原古都区。 相似文献
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为开发现有掘进生产设备的潜力,以提高小断面巷道的掘进速度,对以下几个重要方面作了阐述:设备操作者应具备的素质、设备的配套、巷道基础设施建设及某些设备的改进。 相似文献
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我院探工系张国榉副教授主持研制成功直径50毫米十字形、球齿波形螺纹钎头,填补了我国钎头系列的一项空白。截至今年五月份为止,研制成功的直径50毫米十字形,球齿波形螺纹针头,在岩石坚固性系数f=16~20的极坚硬岩石中的平均寿命分别是一百五十四点四米札一百一十七米,分别是进口瑞典十字、球齿针头平均寿命的百分之一百二十六点八和一百五 相似文献
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