关键词: 泥石流, 堆积扇, 土地利用, 小江流域

Abstract: The human-environment confliet is prominent in the high mountain and valley areas of the central Yunnan Plateau, where debris flow accumulation fans serve as important sites for the production andlivelihoods of the local residents. Through the interpretation of Gaofen-2 remote sensing imagery and fieldinvestigations , this study identified the spatial distribution characteristies of debris flow accumulation fansin the Xiaojiang Basin , and analyzed the development scale of these fans as well as the status of land development and utilization. The results indicate that there are 245 debris flow accumulation fans in the Xi.aojiang Basin, covering a total area of 84. 6 km'. These fans are primarily distributed in the middle andlower reaches of the Xiaoiang Basin, at elevations between 500 and 2 000 meters, and along the gentlysloping river valleys with slopes of less than 10°. The average area of the debris flow accumulation fans is0. 35 km’ , with medium and large-sized fans being the most common. Among these fans, 176 have beenextensively developed and utilized for residential and agricultural purposes, covering an area of77. 89 km’, or 92. 196 of the total area. Approximately half of the debris flow accumulation fans host set-tements, and nearly half have roads or bridges passing through them. This study provides valuable guid-anee and reference for land development, remediation, and optimal utilization of debris flow accumulationfans in the Xiaojiang Basin.

Key words: debris flow, accumulation fans, land use, Xiaojiang basin