The upper reaches of Minjiang (Min) River were selected to research the relationship between debris flow fan formation and topography. Combining the historical statistical data of settlement and debris flow events, there are 3 years (1994, 2004, and 2014) for which comparable data are available. With the support of remote sensing (RS) and geographic information system (GIS) technology, the distribution characteristics and evolution of valley settlements and debris flow fans in terrain conditions with varying elevation, slope, and slope aspect are analyzed. The coupled relationship between valley settlement and debris flow accumulation fan evolution is analyzed by regression analysis. The results show that the distribution characteristics of valley settlements and debris flow fans in the upper reaches of Min River show high consistency and convergence in different topographic conditions, and they have a response relationship with each other. With elevation, both settlements and debris flow fans increase linearly with each other, and, over time, the rate of change of the distribution of valley fans with debris flow accumulation increases then decreases. In regard to slope, both parameters conform to two polynomial function models, that is, the river valley settlement increases first and then decreases with the increase of debris flow accumulation fans. For the slope aspect, the number of valley settlements increases with the increase of the change rate of debris flow fans density. The study will provide some assistance for the countermeasures on valley settlements to the evolution of debris flow fans in the upper reaches of Min River.

中文翻译：

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不同地形条件下谷地沉降对泥石流风扇演化的响应分析-以Min江上游为例

选择of江上游，研究泥石流扇的形成与地形的关系。结合沉降和泥石流事件的历史统计数据，有3年（1994年，2004年和2014年）可获得可比较的数据。借助遥感（RS）和地理信息系统（GIS）技术，分析了海拔，坡度和坡度各不相同的地形条件下谷地沉降和泥石流风扇的分布特征和演化。通过回归分析，分析了谷底沉降与泥石流堆积扇演化之间的耦合关系。结果表明，Min河上游流域泥石流分布特征在不同地形条件下表现出较高的一致性和收敛性，并具有响应关系。随着海拔的升高，沉降扇和泥石流风扇相互线性增加，并且随着时间的流逝，随着泥石流积累的谷底风扇分布的变化率增大，然后减小。关于坡度，两个参数都符合两个多项式函数模型，即，随着泥石流堆积扇的增加，河谷沉降首先增加，然后减少。对于斜坡而言，谷底沉降的数量随着泥石流风扇密度变化率的增加而增加。