数字高程模型在滑坡地表排水设计中的应用

研究数字高程模型(DEM)在滑坡地表排水辅助设计中的应用。阐述了基于DEM进行滑坡地表排水沟地形剖面绘制、沟段坡降量取、汇水面积确定、设计流量确定、水力计算和断面尺寸设计等各步骤的思路和方法，并结合三峡库区某滑坡实例作了进一步说明。该法可克服以往地表排水设计中仅由设计人员依据经验手工量取和绘制所存在的费工费时、准确性不高等不足，为提高滑坡地表排水设计的合理性和效率开辟了一条新途径。

APPLICATION OF DIGITAL ELEVATION MODEL IN DESIGNING THE LANDSLIDE SURFACE DRAINAGE DITCH SYSTEM

This paper studies the application of digital elevation model (DEM) to the design of the surface drainage ditch system. It discusses in detail the thought and process of all tasks in the design for the surface drainage ditch system, such as, the generation of drainage ditch profile, calculation of gradient ratio for each ditch section, definition of the drainage area for each drainage ditch or each section of a drainage ditch, determination of designing flow quantity, hydraulic calculation and design of section size. And it further demonstrates the thought and process by a landslide example in the Three Gorge Reservoir area. In the past, most of those tasks were performed by engineers using hand and highly depending on experience, therefore, the design work is very tedious and inaccurate. This method is supposed to be a possible way to improve the rationality and efficiency of the design.