Linking source and sink in the Rwenzori Mountains and adjacent rift basins, Uganda: Landscape evolution and the sedimentary record of extreme uplift

鲁文佐里山脉和邻近的裂谷侧翼代表了地球上裂谷侧翼的最高隆起，其隆起可能对晚中新世以来东非的干旱化有重大贡献。在步枪方案范围内，该项目旨在利用地形特性、宇宙成因核素（10Be）和冲积沉积物重建鲁文佐里山脉极端隆起以来的侵蚀演变。将根据遥感技术，选择侵蚀活跃和河流阶地或邻近盆地填充物暴露的代表性地点进行实地研究。将从沉积学和河流动力学方面研究适当的露头。一些光释光测年将提供较年轻的冲积层的时间框架。一个高分辨率的DEM（30米）被用来分析景观形态的裂谷侧翼和它的依赖隆起率，降雨分布，可靠性的岩石，和剥蚀率。特别注意识别新构造运动。将通过实地测绘、地理信息系统分析和使用现有地表过程模型的适当计算机代码进行数值试验，探索侵蚀的控制因素。最后，结果将被整合到一个进化模型的侵蚀，沉积物通量，和裂谷盆地填充的中部非洲裂谷的西部分支。

The Rwenzori Mountains and adjacent rift flanks represent the highest uplift of rift flanks on Earth and its uplift may have signifiantly contributed to the aridisation of East Africa since the Late Miocene. Within the RIFLE programme this project aims to reconstruct the erosional evolution of the Rwenzori Mountains since their extreme uplift using topographic properties, cosmogenic nuclides (10Be) and alluvial sedi-ments. Based on remote sensing, representative localities of active erosion and exposures of river terraces or the proximal basin fill will be selected for field studies. Suitable outcrops will be studied with respect to sedimentology and fluvial dynamics. Some OSL (optically stimulated lumines-cence) datings will deliver a time frame for the younger alluvial deposits. A highly resolved DEM (30 m) is used to analyse the landscape morphometry of the rift flanks and its dependence on uplift rates, rain-fall distribution, credibility of bedrocks, and denudation rates. Specific attention is paid to identify neotectonic movements. The controlling factors of erosion will be explored by field mapping, GIS analysis and numerical experiments using a suitable computer code of existing surface process models. Finally, the results will be integrated into an evolutionary model of erosion, sediment flux, and rift basin fill for the central western branch of the East African Rift.