Wildfire increases the potential connectivity of runoff and sediment throughout watersheds due to greater bare soil, runoff and erosion as compared to pre‐fire conditions. This research examines the connectivity of post‐fire runoff and sediment from hillslopes (<1.5 ha; n = 31) and catchments (<1000 ha; n = 10) within two watersheds (<1500 ha) burned by the 2012 High Park Fire in northcentral Colorado, USA. Our objectives were to: (1) identify sources and quantify magnitudes of post‐fire runoff and erosion at nested hillslopes and watersheds for two rain storms with varied duration, intensity and antecedent precipitation; and (2) assess the factors affecting the magnitude and connectivity of runoff and sediment across spatial scales for these two rain storms. The two summer storms that are the focus of this research occurred during the third summer after burning. The first storm had low intensity rainfall over 11 hours (return interval <1–2 years), whereas the second event had high intensity rainfall over 1 hour (return interval <1–10 years). The lower intensity storm was preceded by high antecedent rainfall and led to low hillslope sediment yields and channel incision at most locations, whereas the high intensity storm led to infiltration‐excess overland flow, high sediment yields, in‐stream sediment deposition and channel substrate fining. For both storms, hillslope‐to‐stream sediment delivery ratios and area‐normalised cross‐sectional channel change increased with the percent of catchment that burned at high severity. For the high intensity storm, hillslope‐to‐stream sediment delivery ratios decreased with unconfined channel length (%). The findings quantify post‐fire connectivity and sediment delivery from hillslopes and streams, and highlight how different types of storms can cause varying magnitues and spatial patterns of sediment transport and deposition from hillslopes through stream channel networks.

中文翻译：

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嵌套山坡和集水区的火后径流与沉积物的连通性

与火灾前相比，野火增加了裸露的土壤，径流和侵蚀，从而增加了整个流域径流和泥沙的潜在连通性。此研究探讨后火径流泥沙从山坡的连通性（< 1.5公顷; ñ = 31）和集水区（<千公顷; ñ = 10）2个流域内（<1500公顷）被美国科罗拉多州中北部的2012年高公园大火烧毁。我们的目标是：（1）确定持续时间，强度和前降水量各不相同的两次暴雨的嵌套山坡和流域火源后径流和侵蚀的来源并进行量化；（2）评估影响这两场暴雨的径流和沉积物在空间尺度上的大小和连通性的因素。作为研究重点的两个夏季风暴发生在燃烧后的第三个夏季。第一次暴风雨在11小时内有低强度降雨（返回间隔<1-2年），而第二次暴风雨在1小时内有高强度降雨（返回间隔<1-10年）。较低强度的暴风雨之前是高降雨，导致大多数地方的山坡沉积物产量和河道切缝低；而高强度的暴风雨则导致入渗-过度的陆流，高沉积物产量，河内沉积物沉积和河道底物精细化。 。对于这两种风暴，坡度与河流的沉积物输送比和面积归一化的横断面河道变化都随高度严重燃烧的集水区的百分比而增加。对于高强度风暴，坡道与河流的沉积物输送比随着无限制通道长度（％）而降低。研究结果量化了火灾后的连通性以及山坡和溪流的泥沙输送，