This study aimed to characterize the topographic effect on landslides attributes and explore the implications on risk management in a tropical mountainous environment. A database was constructed based on landslide inventory from field surveys supplemented by desk research. The topographic parameters were derived from STRM DEM of a 30 m resolution for the study area. The analysis of the data was conducted in Arc GIS 10.5 environment. The relationship between landslides and topographic conditioning factors was analysed using the Frequency Ratio model. Results revealed that most landslides were distributed within the altitudinal range of 1500 to 1800 m a.s.l. on moderately steep slopes (15 o-20o) in concave curvatures (hollows). Shallow slides mainly debris flows and debris slides were predominant. Most slope failures were initiated on mid to upper slope positions in either new or old scars. Some runout depositions of large slides ended in streams thus undermining water quality. The findings on topographic parameters have implications and yet landslide risk management by the local population was generally inadequate. Any efforts toward effective landslide risk management should prioritise greening the sensitive topographic hollows and old scars particularly on mid to upper slope positions.

中文翻译：

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地形对乌干达山Manafwa流域滑坡特征的影响及其对风险管理的启示

这项研究旨在表征地形对滑坡属性的影响，并探讨对热带山区环境中风险管理的影响。根据来自现场调查的滑坡清单建立了数据库，并辅以案头研究。地形参数来自研究区域的30 m分辨率的STRM DEM。数据分析是在Arc GIS 10.5环境中进行的。使用频率比模型分析了滑坡与地形条件因素之间的关系。结果表明，大多数滑坡分布在1500至1800 m asl的海拔范围内，呈凹曲率（凹陷）的中等陡坡（15 o-20o）。浅层滑坡主要是泥石流，而以碎屑滑坡为主。大多数斜坡破坏都是在新旧疤痕的中上斜坡位置开始的。大型载玻片的一些跳动沉积结束于溪流中，从而破坏了水质。关于地形参数的发现具有影响，但当地居民对滑坡风险的管理通常是不充分的。进行有效的滑坡风险管理的任何努力均应优先对敏感的地形空洞和旧伤痕进行绿化，尤其是在中上斜坡位置。