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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Spatial and temporal patterns of sediment storage over 45 years in Carnation Creek, BC, a previously glaciated mountain catchment
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Spatial and temporal patterns of sediment storage over 45 years in Carnation Creek, BC, a previously glaciated mountain catchment

机译：45年来康乃馨溪，BC，以前冰川山区的空间和时间模式

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The movement of sediment through mountain river networks remains difficult to predict, as processes beyond streamflow and particle size are responsible for the entrainment and transport of bedload sediment. In deglaciated catchments, additional complexity arises from glacial impacts on landscape organization. Research to date indicates that the quantity of sediment stored in the channel is an important component of sediment transport in systems which alternate between supply and transport limited states, but limited long-term field data exist which can capture storage-transfer dynamics over a timescale encompassing episodic supply typical of mountain streams. We use a 45-year dataset with annual and decadal-scale data on sediment storage, channel morphology, and wood loading to investigate the spatial and temporal organization of storage in Carnation Creek, a previously glaciated 11 km(2) catchment on Vancouver Island, British Columbia. Sediment is supplied episodically to the channel, including additions from debris flows in the early 1980s just upstream of the studied channel region. Analyzing the spatial and temporal organization of sediment storage along 3.0 km of channel mainstem reveals a characteristic storage wavelength similar to the annual bedload particle travel distance. Over time, two scales of variation in storage are observed: small-scale fluctuation of 3-10 years corresponding to local erosional and depositional processes, and larger scale response over 25-35 years related to supply of sediment from hillslopes. Complex relationships between storage and sediment transfer (i.e., annual change in storage) are identified, with decadal-scale hysteresis present in storage-transfer relations in sites influenced by hillslope sediment and logjams. We propose a conceptual model linking landscape organization to temporal variability in storage and to storage-export cycles. Collectively, our results reaffirm the importance of storage to sediment transport and ch
机译：沉积物通过山区河流网络的运动仍然难以预测，因为流出流出和粒径的过程负责饲料沉积物的夹带和运输。在解开的集水区中，额外的复杂性来自景观组织的冰川影响。迄今为止的研究表明，渠道中存储的沉积物量是在供应和运输有限态之间交替的系统中沉积物传输的重要组成部分，但存在有限的长期现场数据，这可以通过时间尺度捕获存储转移动态的长期现场数据典型的山溪典型的情节供应。我们使用45年的DataSet与沉积物储存，通道形态和木材装载的年度和二等规模数据，以调查Carnation Creek的空间和时间组织，以前在温哥华岛上铺用11公里（2）个集水区，不列颠哥伦比亚省。沉积物将围绕通道提供，包括在20世纪80年代初的碎片流动的添加在所研究的沟道区的上游。分析沿3.0公里的通道主机沿3.0公里的沉积物存储空间和时间组织揭示了类似于年床单颗粒行程距离的特征存储波长。随着时间的推移，观察到储存的两种变化尺度：对应于局部侵蚀和沉积过程的小规模波动，与山坡沉积物供应超过25-35岁以下的规模响应。鉴定了储存和沉积物转移（即，储存年度变化）之间的复杂关系，具有由Hillslope Sardiment和Logjams影响的站点的存储转移关系中的Decadal-Scale滞后。我们提出了一个将景观组织的概念模型联系到存储空间的时间可变性和存储出口周期。统称，我们的成果重申储存到沉积物运输和CH的重要性

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