Geomorphology of the SW flank of the Doña Juana Volcanic Complex, Colombia: interplay of fluvial, denudational, structural, and volcanic processes

In the SW flank of the Doña Juana Volcanic Complex, Colombia, the dynamic geomorphic system responds to the complex interaction between volcanic, climatic, and tectonic driving forces, where the recent landscape (last ~20 years) is being shaped as a function of denudational processes. Despite the rapid rates of landforms development, the geomorphology of this area is poorly documented. To overcome the lack of information we mapped the area using a GeoSAR DEM and an Unmanned Aerial Vehicle based DEM. This paper presents two maps, a 1:25,000 scale map and a 1:5,000 detailed map of landforms along the Humadal Creek. Detailed categorization of landforms (at 1:5,000) allowed us to identify geomorphic processes in the village of Las Mesas and rural areas that triggered hazards for the communities. The morphologic evolution interpretation of this volcanic tropical area serves as a tool for future geohazard assessment in inhabited areas with important information gaps.

在哥伦比亚多尼亚胡安娜火山复合体（Doña Juana Volcanic Complex）的西南侧坡，该动态地貌系统响应火山作用、气候条件与构造驱动力间的复杂相互作用，近约20年的地表景观正以剥蚀作用为驱动机制被持续塑造。尽管该区域地貌发育速率极快，但相关地貌学研究记录却极为匮乏。为填补该数据空白，研究团队采用GeoSAR数字高程模型（GeoSAR DEM）与无人机载数字高程模型（Unmanned Aerial Vehicle-based DEM）对该区域开展了地貌测绘。本研究呈现两幅地貌图：分别为沿Humadal溪（Humadal Creek）布设的1:25000比例尺地貌图，以及1:5000比例尺高精度地貌图。通过1:5000比例尺下的地貌精细分类，研究团队得以识别出拉斯梅萨斯村（Las Mesas）及周边乡村区域内触发社区灾害风险的地貌作用过程。对该热带火山区域的地貌演化过程进行解译，可为后续存在重要信息缺口的人居区域地质灾害风险评估提供有效技术支撑。