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On 17 August 2020, a debris flow occurred in the Shuimo catchment, Wen County, which blocked the Baishui River, forming a barrier lake and causing significant casualties and property damage. In this study, remote sensing, InSAR, field surveys, and unmanned aerial vehicle (UAV) techniques were used to analyze the causal characteristics, material source characteristics, dynamic processes, and disaster characteristics after the debris flow. The results showed that the Shuimo catchment belongs to low-frequency debris flows, with a recurrence cycle of more than 100 years and concealed features. High vegetation coverage (72%) and a long main channel (11.49 km) increase the rainfall-triggering conditions for debris flow occurrence, making it more hidden and less noticed. The Shuimo catchment has a large drainage area of 31.26 km2, 15 tributaries, significant elevation differences of 2017 m, and favorable hydraulic conditions for debris flow. The main sources of debris flow material supply are channel erosion and slope erosion, which account for 84.4% of the total material. The collapse of landslides blocking both sides of the main channel resulted in an amplification of the debris flow scale, leading to the blockage of the Baishui River. The scale of the accumulation fan is 28 \u00d7 104 m3, and the barrier lake area is 37.4 \u00d7 104 m2. The formation mechanism can be summarized as follows: rainfall triggering \u2192 shallow landslides \u2192 slope debris flow \u2192 channel erosion \u2192 landslide damming \u2192 dam failure and increased discharge \u2192 deposition and river blockage. The results of this study provide references for remote sensing emergency investigation and analysis of similar low-frequency and concealed debris flows, as well as a scientific basis for local disaster prevention and reduction.<\/jats:p>","DOI":"10.3390\/rs16152817","type":"journal-article","created":{"date-parts":[[2024,7,31]],"date-time":"2024-07-31T17:16:49Z","timestamp":1722446209000},"page":"2817","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["The Application of Remote Sensing Technology in Post-Disaster Emergency Investigations of Debris Flows: A Case Study of the Shuimo Catchment in the Bailong River, China"],"prefix":"10.3390","volume":"16","author":[{"given":"Feibiao","family":"Huo","sequence":"first","affiliation":[{"name":"Key Laboratory of Western China\u2019s Environmental Systems, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China"}]},{"given":"Fuyun","family":"Guo","sequence":"additional","affiliation":[{"name":"Geological Environment Monitoring Institute of Gansu Province, Lanzhou 730050, China"}]},{"given":"Pengqing","family":"Shi","sequence":"additional","affiliation":[{"name":"Geological Environment Monitoring Institute of Gansu Province, Lanzhou 730050, China"}]},{"given":"Ziyan","family":"Gao","sequence":"additional","affiliation":[{"name":"Geological Environment Monitoring Institute of Gansu Province, Lanzhou 730050, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1180-8868","authenticated-orcid":false,"given":"Yan","family":"Zhao","sequence":"additional","affiliation":[{"name":"Gansu Technology & Innovation Center for Environmental Geology and Geohazards Prevention, Gansu Geohazards Field Observation and Research Station, School of Earth Sciences, Lanzhou University, Lanzhou 730000, China"}]},{"given":"Yongbin","family":"Wang","sequence":"additional","affiliation":[{"name":"Key Laboratory of Western China\u2019s Environmental Systems, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3102-6193","authenticated-orcid":false,"given":"Xingmin","family":"Meng","sequence":"additional","affiliation":[{"name":"Gansu Technology & Innovation Center for Environmental Geology and Geohazards Prevention, Gansu Geohazards Field Observation and Research Station, School of Earth Sciences, Lanzhou University, Lanzhou 730000, China"}]},{"given":"Dongxia","family":"Yue","sequence":"additional","affiliation":[{"name":"Key Laboratory of Western China\u2019s Environmental Systems, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China"}]}],"member":"1968","published-online":{"date-parts":[[2024,7,31]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"104348","DOI":"10.1016\/j.catena.2019.104348","article-title":"Debris Flow Triggering Characterization through a Comparative Analysis among Different Mountain Catchments","volume":"186","author":"Pastorello","year":"2020","journal-title":"Catena"},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Zhao, Y., Meng, X., Qi, T., Chen, G., Li, Y., Yue, D., and Qing, F. 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