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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Debris-flow-dominated sediment transport through a channel network after wildfire
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Debris-flow-dominated sediment transport through a channel network after wildfire

机译：通过野火后的渠道网络泥石流统治沉积物运输

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Field studies that investigate sediment transport between debris-flow-producing headwaters and rivers are uncommon, particularly in forested settings, where debris flows are infrequent and opportunities for collecting data are limited. This study quantifies the volume and composition of sediment deposited in the arterial channel network of a 14-km(2) catchment (Washington Creek) that connects small, burned and debris-flow-producing headwaters (<1 km(2)) with the Ovens River in SE Australia. We construct a sediment budget by combining new data on deposition with a sediment delivery model for post-fire debris flows. Data on deposits were plotted alongside the slope-area curve to examine links between processes, catchment morphometry and geomorphic process domains. The results show that large deposits are concentrated in the proximity of three major channel junctions, which correspond to breaks in channel slope. Hyperconcentrated flows are more prominent towards the catchment outlet, where the slope-area curve indicates a transition from debris flow to fluvial domains. This shift corresponds to a change in efficiency of the flow, determined from the ratio of median grain size to channel slope. Our sediment budget suggests a total sediment efflux from Washington Creek catchment of 61 x 10(3) m(3). There are similar contributions from hillslopes (43 +/- 14 x 10(3) m(3)), first to third stream order channel (35 +/- 12 x 10(3) m(3)) and the arterial fourth to fifth stream order channel (31 +/- 17 x 10(3) m(3)) to the total volume of erosion. Deposition (39 +/- 17 x 10(3) m(3)) within the arterial channel was higher than erosion (31 +/- 17 x 10(3) m(3)), which means a net sediment gain of about 8 x 10(3) m(3) in the arterial channel. The ratio of total deposition to total erosion was 0.44. For fines <63 mu m, this ratio was much smaller (0.11), which means that fines are preferentially exported. This has important implications for suspended sediment and water quality in downstream rivers. (c) 2019 John Wiley & Sons, Ltd.
机译：研究碎屑 - 流动的母线和河流之间的沉积物运输的现场研究罕见，特别是在森林环境中，其中碎片流量是不常见的，并且收集数据的机会受到限制。本研究量化了14公里（2）个集水区（华盛顿河）的动脉通道网络中沉积的沉积物的体积和组成，可以连接小型，烧伤和碎屑生成的母线（<1 km（2））澳大利亚的烤箱河。我们通过将新数据与沉积物输送模型相结合来构建沉积预算，用于消防后碎片流动。沉积物的数据沿着坡度区域曲线绘制，以检查过程之间的链接，集水器形态学和地貌过程域之间。结果表明，大型沉积物集中在三个主要通道连接的附近，这与通道斜率的断裂相对应。朝向集水区出口更加突出的过度切口流动，其中斜率区域曲线表示从碎片流向氟尿域的过渡。这种偏移对应于流动效率的变化，从中值晶粒尺寸与信道斜率的比率确定。我们的沉积预算表明，来自华盛顿溪集水的总沉积物流出61 x 10（3）米（3）。 Hillslopes（43 +/- 14 x 10（3）m（3））有类似的贡献，第一至第三流订单通道（35 +/- 12 x 10（3）m（3））和动脉第四第五流订单通道（31 +/- 17 x 10（3）m（3））侵蚀总量。动脉通道内的沉积（39 +/- 17×10（3）m（3））高于腐蚀（31 +/- 17×10（3）m（3）），这意味着净沉积物增益动脉通道中的8 x 10（3）m（3）。总沉积与总侵蚀的比例为0.44。对于粉末<63μm，该比例要小得多（0.11），这意味着优先出口罚款。这对下游河流悬浮沉积物和水质具有重要意义。 （c）2019 John Wiley＆Sons，Ltd。

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