Study on the Analyzing Method of Aerial Photograph Images of Flood Flows

1. 洪水航拍图像分析方法研究(1)提出了一种图像扫描仪的定标方法。(2)针对相机拍摄的照片光轴不垂直的情况，提出了一种校正方法。(3)提出了消除相关分析得到的速度矢量数据误差的方法。(4)明确了相关窗和检测窗的最佳尺度。(5)提出了一种简便的用摄像机测量洪水表面流速的方法。(1)在Tone河主河道边界附近发现了两种典型的沉积物。通过对航拍照片的分析，明确了这些沉积物与洪水湍流结构有关。(2)发现洪水湍流结构与河床构型的关系受洪水非定常特性的强烈影响。

1. Study on the Analyzing Method of Aerial Photograph Images of Flood Flows(1) The calibration method of an image scanner was developed.(2) The method was developed to correct the photograph images taken by the camera whose optical axis is not vertical.(3) The method was developed to eliminate the erroneous velocity vector data obtained by correlation analyses.(4) The optimum scales of correlation windows and detection windows were made clear.(5) The convenient method to measure surface velocities of the flood flows by the video camera was developed.2. Study on the large-scale structure of flood flows(1) Two kinds of typical sediment deposits were found around the main-channel boundaries of the Tone River. It was clarified by analyzing the aerial photographs that these deposits are related to the turbulence structure of the flood flows(2) The relationship between turbulence structure of the flood flow and the river-bed configurations was found to be strongly affected by unsteady characteristics of the flood flows.