Dynamic measurement of undulating water surfaces in a lock fill
Dynamic measurement of undulating water surfaces in a lock fill
复制标题
动态测量填海中起伏的水面
DOI：
--
复制
发表时间：
1995
期刊：
影响因子：
--
通讯作者：
R. McGee
中科院分区：
文献类型：
--
作者：
C. Fraser;R. McGee
船闸运行中的一个主要问题是，在充水(或排空)过程中水面的动态如何转化为船闸内船只所受的力。漂移力受水面振荡的影响很大，因此，通过在充填周期中以频繁的间隔绘制起伏的水面图，可以显著地增强漂移力的建模。近景摄影测量为水面测绘提供了一种实用而准确的手段。本文报告了一个项目，在该项目中，对分布在密西西比州海湾斯普林斯船闸160×33米表面积上的71个浮动目标进行了摄影测量监测。在会聚成像配置中使用了两台同步的大幅面CRC-1相机，在几个8分钟26米的升降周期中以8秒的间隔记录XYZ坐标数据，精度优于2厘米。然后，对在每个填充/清空周期中拍摄的大约100张照片使用自动图像坐标测量。根据所得到的带有时间标记的数字高程模型，计算与数据相关的水力参数，并生成图形可视化序列来展示水面振荡的谐波
One of the principal concerns in lock operation is the question of how the dynamics of the water surface during the fill (or emptying) cycle translate to forces on vessels in the lock. Drift forces are greatly influenced by water surface oscillations, and, thus, their modeling is considerably enhanced by the mapping of the undulating water surface at frequent intervals during the fill cycle. Close-range photogrammetry offers a practical and accurate means for water surface mapping. This paper reports on a project in which an array of 71 floating targets, distributed throughout the 160- by 33-m surface area of the Bay Springs Lock in Mississippi, were monitored photogrammetrically. Two synchronized large-format CRC-1 cameras were employed in a convergent imaging configuration to record XYZ coordinate data to better than 2-cm accuracy, at 8-second intervals over several 8-minute, 26-metre lift cycles. Automatic image coordinate mensuration was then used for tke 100 or so photographs taken at each fill/empty cycle. From the resulting time-tagged digital elevation model, data-pertinent hydraulic parameters were computed and graphics visualization sequences were generated to illustrate water surface oscillation harmonics