提升识别河道倾斜流凌图像准确度的理论基础与实践  

Theoretical Basis and Practice of Improving the Accuracy of Identifying River Slope Ice⁃Run Image

作　　者：吴帅 李春江 李志军[1] 张丽敏[1] 张宝森[2,3] 邓宇[2,3] WU Shuai;LI Chunjiang;LI Zhijun;ZHANG Limin;ZHANG Baosen;DENG Yu(State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116024,China;Yellow River Institute of Hydraulic Research,YRCC,Zhengzhou 450003,China;Research Center on Levee Safety Disaster Prevention,MWR,Zhengzhou 450003,China)

机构地区：[1]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116024 [2]黄河水利委员会,黄河水利科学研究院,河南郑州450003 [3]水利部堤防安全与病害防治工程技术研究中心,河南郑州450003

出　　处：《人民黄河》2023年第4期115-120,125,共7页Yellow River

基　　金：国家自然科学基金资助项目(51979024,51879116);中央级公益性科研院所基本科研业务费专项(HKY-JBYW-2022-08);国家重点研发计划项目(2018YFC1508400)。

摘　　要：针对黄河什四份子弯道远程监测视频中流凌图像存在倾斜变形问题,基于摄影测量学原理对倾斜变形图像进行校正,建立一种考虑相机安装高度、相机倾斜角度及河道水位变动影响的图像像点比例尺校正方法。以2021—2022年凌汛期什四份子弯道监测图像为例,结合现场测量数据与雷达数据,拟合水平比例尺和竖直比例尺表达式,根据图像信息和水位信息实时计算流凌真实位置信息,公式拟合图像比例尺的相对误差在±6%以内;采用比例尺表达式对图像进行校正,获得校正后流凌密集度、流速等参数,统计流凌密集度与流速关系,证明了倾斜流凌图像校正的必要性。There was a problem of oblique and deformation in icerun image taken by the fixed video camera on the bank in Shisifenzi curve of the Yellow River.Based on the principle of photogrammetry,the scale correction method of image points was established to correct the oblique image,in which the method considered some factors such as the camera mounting height,camera oblique angle and water level variation.Taking the oblique image of the Yellow River in the ice⁃run flood season of 2021-2022 as the correction object,the corrected formulas in the horizontal and vertical directions were fitted respectively by the field calibration measurement data and radar data.These expressions re⁃alized the function of real⁃time calculation of the real position information of the flow ridge from the image information and the water level in⁃formation.The relative error of the image scale fitted by the formula was within±6%.After the correction of the oblique image,the real ice⁃run parameters such as concentration and velocity were obtained.In addition,the relationship between the ice⁃run density and ice⁃run velocity was also analyzed and the necessity of oblique image correction was proved.

关 键 词：倾斜流凌图像校正 摄影测量 比例尺表达式 流凌密集度 流凌流速 黄河 

分 类 号：TV875[水利工程—水利水电工程] P332.8[天文地球—水文科学] TV882.1[水利工程—水文学及水资源]