The study examined gully erosion in Koboko, North‐western Uganda, initially a war refugee camp, which progressively turned into a permanent rural town. A repeatable, low‐cost methodology to quantify gully properties in data‐scarce, resource‐limited urban contexts is developed, which integrates collection of existing hydrological, land use data, topographic surveys, hydrological and hydraulic modelling, and interviews to local inhabitants and stakeholders. Four main gullies have developed in the last 10–15 years along the eastern, hillside of Koboko, with width‐to‐depth ratios not exceeding 3 and maximum scour depths of 9 m. Their length ranges between 270 and 460 m in the most densely populated area and is mostly unstable, especially for slopes exceeding 3%. Causes of the gullies include urban road development, changes in urban land cover to impervious surfaces, and inadequate planning of the urban drainage system. The gullies hamper the safety of people and buildings and increase health risks in an already vulnerable community. Slope–area and slope–road length thresholds suggest Koboko to be less susceptible to gullies compared to other reported urban contexts and support the anthropogenic origin of the observed gullies. The analysis allowed to design mitigation measures that still self‐sustain after 3 years of implementation. Results upscaled at country level can be used to predict which other urban centres in Uganda may be susceptible to gullying. Gullying in rapidly developing urban areas in sub‐Saharan Africa clearly show the co‐evolution of a social and a geomorphic system, which should be accounted for in urban planning to avoid adverse societal effects.

中文翻译：

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撒哈拉以南非洲的城市沟壑侵蚀：来自乌干达的案例研究

该研究检查了乌干达西北部Koboko的沟壑侵蚀，最初是战争难民营，后来逐渐变成了永久性的农村城镇。开发了一种可重复，低成本的方法来量化数据稀缺，资源有限的城市环境中的沟壑特性，该方法整合了现有水文，土地利用数据，地形调查，水文和水力模型的收集，以及对当地居民和利益相关者的访谈。在过去的10-15年中，沿着Koboko的东部山坡形成了四个主要的沟壑，其宽深比不超过3，最大冲刷深度为9 m。在人口最稠密的地区，它们的长度在270至460 m之间，并且大多不稳定，尤其是对于超过3％的斜坡。造成沟渠的原因包括城市道路发展，改变城市土地覆盖以渗透不透水的表面，以及城市排水系统的规划不足。沟渠妨碍了人们和建筑物的安全，并在一个已经脆弱的社区增加了健康风险。斜坡区域和斜坡道路长度的阈值表明，与其他报告的城市环境相比，科博科不易受到沟壑的影响，并支持观测到的沟壑的人为起源。通过分析，可以设计缓解措施，这些措施在实施3年后仍可以自我维持。在国家一级放大后的结果可用于预测乌干达的哪些其他城市中心可能会遭受暴雨的影响。在撒哈拉以南非洲快速发展的城市地区，人们的食沟明显显示出社会和地貌系统的共同演变，