江西省九江市规划区地质灾害易发性评估

在阐述九江市规划区的地质背景、地形地貌特征和水文地质、工程地质条件及其地质灾害发育现状的基础上,对规划区的地质灾害易发性进行了较详细的评估,圈定出十里铺、沙河街和狮子3个地面塌陷易发区;国棉二厂、官湖、炼油厂和沙河街4个地面塌陷较易发区。在规划区内选取11个均为土岩混合斜坡,斜坡坡度15°~30°,斜坡高度20m~100m,强风化带厚度和残坡积层厚度均小于3m的自然斜坡进行评估,其中有6个为稳定性中等,占总数的54.5%,稳定性好的5个,占总数的45.5%。并提出了地质灾害防治建议。     

自适应对称调和遗传算法在水库中长期发电调度中的应用

针对遗传算法存在求解精度与收敛速度间的矛盾,提出一种自适应对称调和遗传新算法。以清江隔河岩水库为例,建立了水库发电最优调度的数学模型,取得了满意的结果。结果分析表明,新的耦合模型避免了网络寻优的盲目性,从而达到最优的拟合效果,有效地提高了预测精度和速度。拓宽了建立中长期负荷预测模型的途径。     

基于改进的遗传算法边坡稳定性分析方法及其应用

在遗传算法和瑞典条分法的基础上,提出了对边坡临界滑裂面的搜索方法及其最小安全系数的求解方法.文中利用安全系数的倒数作为目标函数,可行域根据实际边坡的尺寸和经验给出,而且在计算过程中根据目标函数值进行调节,逐步缩小搜索空间,使搜索效率提高.算法中利用了十进制遗传算法的改进操作优体克隆操作和子体优生操作,提高了搜索的速度和精度.     

Depth Contour Smoothing Based on the Fitting of Multi-Segment Bezier Curves

To overcome smoothness inconsistencies in depth contours interpolated from sounding data, this paper proposes a smoothing method based on the fitting of multi-segment Bezier curves considering navigational safety. The basic principle of this method is the division of a generated depth contour into a series of bends categorized as either convex bends or concave bends. Different smoothing strategies are designed for different bends while considering the safety constraint. Convexity-preserving Bezier curves are used to fit convex bends. For concave bends, the line segment of the bend is utilized as a boundary to construct a control polygon within the interior of the bend, after which a Bezier curve is constructed based on the polygon. Experiments with real data are implemented, and the results are compared with those of other methods. The results show that the smoothing procedure for depth contours with angularities is effective and respects the safety constraint; moreover, the shape characteristics are preserved, and high positional accuracy is achieved. In addition, the proposed smoothing method is free of topological inconsistencies.     

基于SRTM数据的广东新一代天气雷达覆盖研究

本文利用SRTM3高分辨率的数字高程模型（DEM）对广东省已建成的12部新一代天气雷达分别进行地形阻挡分析。结果表明,在低仰角（0.5°）的观测结果中,韶关、连州以及肇庆雷达受地形阻挡较严重,深圳、阳江、梅州和汕尾的雷达也有大面积阻挡区域,其余雷达的覆盖效果均很好。随着扫描仰角的抬高,地形对雷达波束的阻挡有所减弱。从第4个仰角 （3.4°）开始,所有雷达均无地形阻挡。在海拔5 km范围内12部雷达可以完全覆盖广东全省,大部分地区至少有4部雷达重叠。离地3 km和海拔3 km的雷达覆盖情况均显示,除广东省北部和西北部极少部分地区没有雷达覆盖外,大部分地区均有2部以上雷达覆盖,珠江三角洲入海口一带甚至有4~6部雷达重叠。在离地2 km范围内,广东省雷达组网能够有效覆盖广东省大部分区域。在离地1 km范围内,广东省北部和西北部雷达覆盖效果不太理想,存在较大的空白区。在离地高度2 km和海拔高度3 km以上,雷达组网基本可以覆盖广东全境,因此可以认为广东省雷达的总体布局较好。     

基于中轴变换算法的室内外一体化导航路网自动生成方法

室内外一体化导航路网的快速生成与更新对面向行人的跨场景导航具有重要意义。当前研究主要关注单一场景下的导航路网构建,对于跨室内外场景的导航路网自动生成研究较少。本文基于对偶图思想与二维平面多边形中轴变换（Medial Axis Transform）算法,提出一种室内外一体化导航路网自动生成方法,并以某建筑CAD平面图及周边路网环境为基础数据进行了实例研究。结果表明：该方法能够根据原始数据的几何、拓扑、语义信息自动构建导航路网,并支持室内外跨场景的最短路径查询,在最短路径查询效率上较传统分场景寻路模型整体提升10.18%;相较单一场景下的导航路网,一体化导航路网可结合语义信息将室内及室外导航路网有机统一起来,解决跨场景寻求最优路径的问题,为最优路径规划的相关研究提供了新的思路。     

大民屯凹陷压力场特征及其成因机制探讨

异常地层压力是沉积盆地中的常见现象,其与成烃成藏关系密切。本文以欠压实带的有无、欠压实的幅度大小、持续的深度范围,将大民屯凹陷泥岩压实类型分为4种,即强烈欠压实型、欠压实型、局部欠压实型以及正常压实型。利用测井、地质和钻井资料,运用等效深度法分析了该区现今异常压力的展布特征并探讨了其成因机制。5条超压分布剖面揭示大民屯凹陷的超压体系在凹陷内分布较广泛,纵向上基本可分为上、中、下3套压力体系。①纵向上,上部即Es23段及其以上地层基本为正常压力系统;中部即Es33段为弱超压系统;下部即Es43和Es4地层为强超压系统。②横向上,超压在洼陷中心强烈发育,到斜坡和隆起带渐渐演变为正常压力。压实不均衡和生烃作用是大民屯凹陷超压发育的主要机制。     

海上风电基础结构研究现状及发展趋势

对国外海上风电机组基础结构的研究与工程应用现状进行了较为详尽地分析,重点对我国海上风电场开发建设有借鉴意义的重力式结构、单桩结构、三角架结构和导管架结构进行了分析论述.基于我国海洋工程技术水平和海上风电产业发展的动态,分析发展适合我国国情的海上风电机组基础结构的可行性及必要性,提出我国海上风电产业发展所面临的挑战.     

基于遥感影像光谱信息的二叉决策分类树自动生成方法研究

使用决策树方法进行遥感影像分类时需要人工辅助构建决策树,这种方法存在着一旦数据变化就要人工参与重新建立决策树的缺点。针对这一问题,文中提出了依据地物类的样本训练结果,自动构建二叉决策分类树的方法。从阈值的完整性、有效性以及自动选择满足用户需求最佳的建立决策树标准等方面保证决策树的精度以及合理性等。分类结果表明,与最大似然法相比,文中提出算法分类效果良好。     

Numerical simulations using momentum source wave-maker applied to RANS equation model

For Navier-Stokes equation model using the VOF scheme, Lin and Liu (Lin, P. and Liu, P.L.-F. (1999). Internal wave-maker for Navier-Stokes equations models. J. Waterw. Port Coast. Ocean Eng., 125 (4), 207–215.) developed an internal wave-maker method for which a mass source function of the continuity equation was used to generate target wave trains. Using this internal wave-maker method, various numerical experiments have been conducted without any problems due to waves reflected by a wave-maker. In this study, an internal wave-maker method using a momentum source function was proposed. Various numerical simulations in two and three dimensions were performed using the momentum source wave-maker applied to the RANS equation model in a CFD code, FLUENT. To verify their applicability in 2 dimensions, the computational results obtained using the momentum source wave-maker in a channel of constant depth were compared with the results obtained by using the mass source wave-maker and with the analytical solutions. And the results of the present numerical simulations of hydraulic experiments, which represent nonlinear waves on a submerged shoal and breaking waves on a plane beach, were compared with measurements. The comparisons showed good agreements between them. To see their applicability into 3-dimensional cases, the present results in a basin of constant depth were compared with the analytical solutions, and they agreed well with each other. In addition, vertical variation of longshore current was presented by using the 3-dimensional simulation results.