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首页> 外文期刊>Water resources research >The pulse of driftwood export from a very large forested river basin over multiple time scales, Slave River, Canada
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The pulse of driftwood export from a very large forested river basin over multiple time scales, Slave River, Canada

机译：来自奴隶河的大型森林流域的浮木出口脉搏在多个时间尺度上变化，加拿大

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This study presents a case study of large wood transport on the great Slave River in northern Canada with the objective to better understand the processes of and variability in pulsed wood fluxes from large forested catchments. We use a varied approach, integrating field characterization of wood, historical anecdotes, repeat aerial imagery of stored wood, and time-lapse imagery of moving wood, for a robust analysis and synthesis of processes behind pulsed wood flux, from yearly uncongested export to rare congested wood floods. Repeat monitoring of known sites of temporary storage with new or historic imagery proved to be a very useful tool for constraining wood flux histories. Pulsed wood export on the Slave River is not an artifact of episodic recruitment from major up-basin disturbances, but rather reflects decadal- to half-century-scale discharge patterns that redistribute wood recruited from channel migration and bank slumping. We suggest that the multiyear flow history is of paramount importance for estimating wood flux magnitude, followed in declining importance by the yearly sequence of peaks and the magnitude and characteristics of the rising limb of individual floods.
机译：本研究以加拿大北部大奴河上的大型木材运输为例，目的是更好地了解来自大型森林流域的脉冲木材通量的过程和变异性。我们使用多种方法，结合了木材的现场特征，历史轶事，重复存储的木材航拍图像和移动的木材的延时图像，以便对脉冲木材通量背后的过程进行可靠的分析和综合，从每年的无拥挤出口到稀有木材拥挤的木材洪水。用新的或历史的图像重复监视已知的临时存储位置对于限制木材通量历史是非常有用的工具。奴隶河上的脉冲木材出口不是主要的流域上游干扰的偶发募集的产物，而是反映了从十年代到半个世纪的排放方式，重新分配了从河道迁移和河岸塌陷中募集的木材。我们认为，多年流量历史对于估算木材通量大小至关重要，其次是峰值的年度序列以及单个洪水上升肢的大小和特征，其重要性依次下降。

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