This study examines the relationship between gully erosion in channels, sidewalls, and interfluves, and precipitation parameters (duration, total accumulation, average intensity, and maximum intensity) annually and seasonally to determine seasonal drivers for precipitation-related erosion. Ordinary Least Square regression models of erosion using precipitation and antecedent precipitation at weekly lags of up to twelve weeks were developed for three erosion variables for each of three geomorphic areas: channels, interfluves, and sidewalls (nine models in total). Erosion was most pronounced in winter months, followed by spring, indicating the influence of high-intensity precipitation from frontal systems and repeated freeze-thaw cycles in winter; erosion in summer was driven by high-intensity precipitation from convectional storms. Annually, duration was the most important driver for erosion, however, during winter and summer months, precipitation intensity was dominant. Seasonal models retained average and maximum precipitation as drivers for erosion in winter months (dominated by frontal systems), and retained maximum precipitation intensity as a driver for erosion in summer months (dominated by convectional storms). In channels, precipitation duration was the dominant driver for erosion due to runoff-related erosion, while in sidewalls and interfluves intensity parameters were equally important as duration, likely related to rain splash erosion. These results show that the character of precipitation, which varies seasonally, is an important driver for gully erosion and that studies of precipitation-driven erosion should consider partitioning data by season to identify these drivers.

中文翻译：

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美国东南部的季节性降水变化和沟壑侵蚀

本研究每年和季节性地检查渠道、侧壁和间流中的沟壑侵蚀与降水参数（持续时间、总累积、平均强度和最大强度）之间的关系，以确定与降水相关的侵蚀的季节性驱动因素。针对三个地貌区域中的每一个的三个侵蚀变量开发了使用降水和前期降水的普通最小二乘回归模型，该模型使用每周滞后最多 12 周的降水和前期降水：渠道、河道和侧壁（共九个模型）。冬季侵蚀最为明显，其次是春季，说明受锋面系统强降水和冬季反复冻融循环的影响；夏季的侵蚀是由对流风暴的高强度降水造成的。每年，持续时间是侵蚀的最重要驱动因素，然而，在冬季和夏季月份，降水强度占主导地位。季节性模型保留平均和最大降水作为冬季侵蚀的驱动因素（以锋面系统为主），并保留最大降水强度作为夏季侵蚀的驱动因素（以对流风暴为主）。在渠道中，降水持续时间是径流相关侵蚀造成侵蚀的主要驱动因素，而在侧壁和河道间，强度参数与持续时间同样重要，可能与雨水溅蚀有关。这些结果表明，随季节变化的降水特征，