Landslide Hazards along River Corridors - Alpine fans less likely subject to debris flows

Depositional fans are formed when sediment moving down a steep channel is deposited where the channel gradient abruptly decreases, for example where a steep valley-wall tributary reaches the valley floor. Sediment can be carried down such a steep channel in flow-type landslides (debris flows, debris floods) or as sediment can be carried by streamflow. Fans are subject to a range of hazards depending which of the preceding processes are active. Debris flows are a style of landslide movement that entail landslide debris moving in a fluid state down a channel, often travelling a long distance from the point of origin. This layer represents fans that are located in alpine areas and are less likely subject to debris flows.沉积扇（depositional fan）形成于沿陡坡河道运移的沉积物在河道坡度骤然降低处堆积的场景，例如谷壁支流汇入谷底之时。沉积物可通过流动型滑坡（flow-type landslide，包含碎屑流（debris flow）、碎屑洪水（debris flood））沿此类陡坡河道向下搬运，亦可经由径流完成搬运。根据上述活跃过程的类型差异，沉积扇会面临一系列不同的灾害风险。碎屑流是一类滑坡运动形式，指滑坡碎屑以流体状态沿河道向下运移，通常可从起源点实现长距离搬运。本数据集对应的沉积扇分布于高寒山区，且发生碎屑流的概率相对较低。