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目前城市建筑工程规划核验竣工测量工作仍以传统测绘为主要技术手段,随着三维激光扫描技术的发展,即时定位与地图构建(SLAM)背包激光扫描技术发展日趋迅速.通过对比分析传统竣工测绘和华测HERON背包SLAM激光扫描系统两种测绘方法,探讨HERON背包SLAM激光扫描系统在建筑竣工测量中的实用性. 相似文献
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本文研究了由污水排海工程污水扩散器排放污水形成的污染羽流在近岸水域中的运动及访问频率场模型。在对Churchill羽流运动模拟法改进的基础上,提出了羽流分片模拟法。本方法利用质量守恒原理给出了其变化关系,并采用连续释放质点追踪法计算羽流的运动路径。考虑到非保守性物质的衰减,给出了相应的计算羽流宽度的公式。对大连市黑石礁污水排海工程方案A污染羽流(以大肠杆菌作为污染指标物)访问频率场的计算表明:访问频率场对于污水排海工程环境影响预测评价和最优排污点的选择具有十分重要的意义。 相似文献
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Hening Huang 《水文科学杂志》2018,63(3):353-368
A theoretical and a semi-empirical model are presented for estimating the uncertainty of streamflow measurements made with an acoustic Doppler current profiler (ADCP) mounted on a moving platform. Both models are based on the statistical analysis of ADCP ensemble discharge time series collected during a transect; therefore, they account for all random error sources associated with the measurement at a site. The theoretical model is developed based on the law of propagation of variance; it explores the theoretical relationship between the variables involved in the problem. The semi-empirical model is developed based on the theory of dimensional analysis; it explores the empirical relationship between the variables. The semi-empirical model is calibrated using 205 transect datasets and verified with an additional 382 transect datasets. It provides a useful tool for the uncertainty analysis and uncertainty-based measurement quality control of moving-boat ADCP streamflow measurements. 相似文献
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