ABSTRACT We measured fine sediment accumulations (FSA) adjacent to eroding off-highway vehicle trails in Ouachita National Forest, Arkansas. Measured trailside FSA was 643 m3. Extrapolated to the entire trail network, this amounts to 216 t ha−1 of trail surface, with a residence time of <1 yr. Natural topographic features are the main storage sites, accounting for 83% of the total, and constructed features for 16%. More than two thirds occur in channels indicates high sediment connectivity. For all types of FSAs, the single largest deposit accounted for about 30% or more of the total. These hotspots are found where topographically suitable storage sites occur downslope of an area of above-average rates of, or recent, trail erosion. Because in many cases trail erosion occurs without evident gullies or rills, these accumulation foci are effective ways to identify erosion hotspots. Relatively small amounts of fine sediment are stored in low-order stream channels. However, the low storage amounts (4,060 m3 estimated for all low-order streams) and lack of silt and clay indicate that fine sediments are highly mobile once reaching streams. Overall, results indicate predominantly short-term storage of fine sediments and high connectivity with and rapid movement through the fluvial system.

中文翻译：

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侵蚀森林步道系统中的细泥沙储存

摘要 我们测量了阿肯色州瓦希塔国家森林中侵蚀非公路车辆路径附近的细粒沉积物堆积 (FSA)。测得的尾侧 FSA 为 643 立方米。外推到整个路径网络，这相当于 216 t ha-1 的路径表面，停留时间 <1 年。自然地貌特征是主要的蓄积点，占总蓄积点的 83%，构造特征占 16%。三分之二以上出现在通道中，表明沉积物连通性高。对于所有类型的 FSA，最大的单一存款约占总数的 30% 或更多。这些热点位于地形合适的储存地点出现在高于平均速度或最近的径迹侵蚀区域的下坡处。因为在许多情况下，径迹侵蚀发生时没有明显的沟壑或细沟，这些聚集点是识别侵蚀热点的有效方法。相对少量的细粒沉积物储存在低阶河道中。然而，低储存量（所有低阶河流估计为 4,060 立方米）和缺乏淤泥和粘土表明，细小的沉积物一旦到达河流就具有很强的流动性。总体而言，结果表明，细粒沉积物主要是短期储存，与河流系统的高度连通性和快速移动。