共查询到20条相似文献,搜索用时 125 毫秒
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目前对水下地形进行测量对于港口城市具有重要意义,不但可以弄清楚水下地形结构,还能够根据水下地形结构制定具体的航运计划和航道设定。同时,我们还能够根据水下地形测量的数据,对水下的矿产资源进行分析和测定。所以,对水下地形测量是十分必要的。从目前的水下地形测量技术来看,GPS和测深仪组合系统得到了广泛的应用,并取得了积极的效果。为了保证水下地形测量取得预期效果,我们要积极采用GPS和测深仪组合系统对水下地形实现全面测量,并对测量数据进行分析和比对,确保数据的准确性,提高我们对水下地形的了解和认识。 相似文献
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针对传统水下地形测量存在外业工作强度大、作业效率低、作业船吃水较深、人员有涉水危险等困难情况,创新采用新型无人船测量系统解决水下测量难题,并介绍了无人船测量系统的基本组成和功能及水下测量系统的测量原理。实践表明利用无人船测量系统对库区水下地形进行测量,能快速获取水下地形数据,提高水下地形测绘效率的同时又避免了人员涉水危险,为水下地形测量提供了一种新的解决方案。 相似文献
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主要介绍利用RTK进行地形测量的主要流程,分析了RTK测量精度,并提出了提高RTK测量精度的对策.利用RTK进行地形测量,明显提高效率,节省大量的人力物力,满足精度要求. 相似文献
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对工程建设来说,地形测量的精准度对工程的投入与施工周期都具备着直接影响,尤其是施工过程中容易发生争执的核心阶段,所以,对于工程建设而言,地形测量的质量发挥着决定性作用。为了有效控制地形测量的质量,确保测量任务高质高效地完成,本文对地形测量质量管控方法的相关情况进行了深入探讨。 相似文献
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Henry W. Tieleman 《Journal of Wind Engineering & Industrial Aerodynamics》2003,91(9):1163-1173
Wind Engineers engaged in wind tunnel simulation experiments for the assessment of wind loads on low-rise structures have to cope with the problem of how to reproduce the pertinent flow parameters characterizing the atmospheric surface layer. Seldom are field observations available, and for the majority of the cases the simulation is therefore not based directly on observed flow quantities at the building site. Instead the Wind Engineer must assess visually the roughness of the terrain at the building site and match it with a particular class from an existing terrain classification. The latter provides then a measure of the roughness in the form of the roughness length that can be used to provide an estimate of the turbulence parameters of the flow to be reproduced in the laboratory using basic principles. The proposed method to obtain these parameters can be easily adapted for a user-friendly electronic evaluation with the prescribed roughness length. 相似文献
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At this moment there is no national specification concerning the application of desert sand with very fine grain. To be able to apply desert sand to mortar and concrete in civil engineering, mortar and concrete made of Tenggeli desert sand and Maowusu sandy land sand have been tested in order to clarify their engineering characteristics. Based on the determined chemical composition and the physical characteristics of desert sand, the mechanical properties of mortar and concrete made of two types of desert sand as fine aggregate were investigated. The results of the tests indicate that desert sand can be used as a fine aggregate in mortar and concrete for general civil engineering. 相似文献
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本文对10个典型的超高层建筑刚性模型进行了测量表面风压的风洞试验,获得了各测量层的阻力、升力和扭矩系数的平均值和根方差。讨论了各测量层风荷载系数随风向角的变化规律,以及高宽比和断面长宽比对方形及矩形建筑风荷载的影响。结果表明,倒角方形、Y形和三角形建筑的风荷载均小于方形与矩形建筑;方形建筑高宽比的增大导致升力系数的根方差明显增大;矩形建筑断面长宽比的增大则使阻力系数的平均值、根方差减少,而升力系数的根方差增大;D类和B类风场中的平均气动力系数相近,而D类风场中脉动气动力系数的根方差大于B类风场。 相似文献
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基于二维影像的空间建模或者其他空间数据的获取,传统的方法是量测立体像对,这需要专门的立体测图仪,甚至还需在2张像片上确定同名点,硬件要求高并且工作量大。采用单片转绘时这种情况就可以得到改善。传统的数字投影转绘都是对航片进行的,通常用于影像纠正生成正射影像,文章所研究的数字投影转绘新方法适用于地面影像的转绘。 相似文献
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通过设计四因素四水平正交试验,在低温条件下恒温4h,分析粉煤灰掺量、沙漠砂替代率、温度和龄期不同对沙漠砂C25混凝土在低温作用下抗压强度的影响。通过重复正交试验的方差分析及极差分析得出:在-10℃^-40℃条件下,温度对沙漠砂C25混凝土抗压强度有高度显著影响,粉煤灰掺量和龄期对沙漠砂C25混凝土低温下抗压强度有显著影响,沙漠砂替代率对沙漠砂C25混凝土低温下抗压强度影响不显著。 相似文献
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《Planning》2019,(1)
Recent years have witnessed the popularity of desert tourism as a fashion tourism product in the 21~(st) century along with the increasing demand for personalized tourism for tourists. The academic community is paying growing attention to desert tourism research, but there is little research on the perception of tourists about the image of desert tourism destinations in Inner Mongolia. With Inner Mongolia as the object of the study, this paper analyzed the image perception and evaluation of tourists for Inner Mongolia desert tourism destinations from three aspects of cognitive image perception, emotional image perception, and overall image perception according to the "cognitive-emotional" model, with the help of relevant network text analysis methods, and proposed some suggestions for the future development of desert tourism destinations in Inner Mongolia from the aspects of increasing desert humanities tourism resources and product development, improving scenic spot management ability, improving tourism service quality, improving tourism infrastructure construction and strengthening environmental protection. It is hoped that this paper can provide a reference for improving the image of Inner Mongolia desert tourism destinations and improving the tourist experience. 相似文献