基于DEM的两段法水库塌岸预测研究

根据两段法进行塌岸预测的基本原理,本文基于Microsoft Visual Studio编程平台和ArcGIS Engine地理信息系统二次开发组件完成两段法塌岸预测程序的实现,将两段法的应用范围由二维空间拓展到三维空间,实现了塌岸宽度和体积计算的参数化和自动化,通过简单的人机交互,即可完成塌岸预测,提高了塌岸预测效率; 塌岸预测前后岸坡形态的三维可视化对比展示,也为库岸防护工程的实施提供了更可靠的数据支持和决策依据。在程序的实现过程中,塌岸预测参数获取主要通过3个途径:(1)通过野外调查实测数据和室内土工实验结果,获取所需的水下稳定坡角和水上稳定坡角; (2)通过地质图和高分辨率航空影像获取岩性分界线、多年洪水位线、枯水位线等参数信息; (3)基于研究区高分辨率DEM(Digital Elevation DEM)数据,绘制地形剖面线,为程序运行提供终止条件。

PREDICTION OF RESERVOIR BANK SLOPE FAILURE USING DEM-SUPPORTED TWO SECTION METHOD

In this article we expand applications of Two Section Method from two-dimension to three-dimension. We use the Microsoft Visual Studio where meantime ArcGIS Engine component is embedded. The software program is designed to compute the width and volume of reservoir bank slope failure. By inputting some parameters including stable slope angle, lithological boundary and flood level line, it automatically runs. Hence, the prediction of bank slope failure can be completed via simple man-machine interaction, which improves the efficiency of prediction. At the meantime, the bank slope shape can be comprised between,before and after bank failure through three-dimension visualization, which can provide more reliable support of data and decision for bank protecting project. In the process of software program, there are three ways of achieving the parameters according to the need of program. They are: (1)Using the field survey and geotechnical test results, the parameters such as bank slope angle stabilized above and underwater, can be obtained,(2)From the geological map and high-resolution Images, lithological boundary, flood level line and low level line can be achieved, and (3)From high-resolution DEM,the terrain profile line can be drawn that acts as the terminal condition of the program.