Large wood and sediment storage in a mixed bedrock-alluvial stream, western Montana, USA
Large wood and sediment storage in a mixed bedrock-alluvial stream, western Montana, USA
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美国蒙大拿州西部的基岩冲积混合溪流中储存了大量木材和沉积物
DOI：
10.1016/j.geomorph.2021.107703
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发表时间：
2021
期刊：
影响因子：
3.9
通讯作者：
Dixon, Jean L.
中科院分区：
文献类型：
--
作者：
Welling, Robin T.;Wilcox, Andrew C.;Dixon, Jean L.
在森林覆盖的山涧中，河流木材的泥沙储存调节了泥沙从山坡通过河道网络的移动，并可以在多个空间尺度上改变河道形态。混合基岩-冲积河道在山川河流网络中普遍存在，但大型木材在这些河流中的分布和地貌影响尚不清楚。为了估计混合基岩-冲积河流中大型木材的分布与沉积物储存的关系，我们测量并描述了大型木材的特征，并调查了蒙大拿州比特鲁特山脉一条河流中相关沉积物的体积。研究河段上游以冲积物为主，下游沿河床和河岸有明显的基岩暴露。基岩-冲积混合河段的木材体积和泥沙储存量分别为冲积河段的50%和15%。大部分木材被组织成淤塞，上游亚段的两个跨河道淤塞分别占河段平均木材和泥沙体积的50%和80%。全河段木材储存的泥沙量与估计的年床沙输出量相同。我们的研究强调了通道形式与木材和沉积物的通量和储存之间的相互作用。通过促进上游沉积物的沉积和储存以及减少下游沉积物的供应，形成跨越河道的堵塞的木材在研究河段中储存了不成比例的木材和沉积物，可能会突出山涧网络中冲积河段和基岩河段之间的差异。
Sediment storage by instream wood in forested mountain streams mediates sediment movement from hillslopes through the channel network and can alter channel morphology at multiple spatial scales. Mixed bedrock-alluvial channels are prevalent in mountain stream networks, yet the distribution and geomorphic impact of large wood within these streams are poorly understood. To estimate how the distribution of large wood in a mixed bedrock-alluvial stream relates to sediment storage, we measured and characterized large wood, and we surveyed the volume of associated sediment within a stream in the Bitterroot Mountains, Montana. The upstream portion of the study reach is predominantly alluvial and the downstream portion has significant bedrock exposure along the channel bed and banks. Wood volume and sediment storage in the mixed bedrock-alluvial subreach are 50% and 15%, respectively, of those measured in the alluvial subreach. Most wood is organized into jams, and two channel-spanning jams within the upstream subreach account for 50% and 80% of the reach-averaged wood and sediment volume, respectively. The volume of sediment stored by wood in the full reach is the same order of magnitude as the estimated annual bedload export. Our study highlights the interactions among channel form and the fluxes and storage of wood and sediment. Wood that forms channel-spanning jams, which store a disproportionate amount of wood and sediment in the study reach, may accentuate differences between alluvial and bedrock-dominated subreaches in mountain stream networks, by promoting sediment deposition and storage upstream and by reducing sediment supply to downstream reaches.
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DOI：
10.1177/0309133317714972
发表时间：
2017-06
期刊：
Progress in Physical Geography
影响因子：
--
作者：
E. Wohl
通讯作者：
E. Wohl
森林溪流中原木台阶的地貌意义1
DOI：
10.1111/j.1467-8306.1982.tb01386.x
发表时间：
1982
期刊：
Annals of The Association of American Geographers
影响因子：
--
作者：
R. Marston
通讯作者：
R. Marston
影响因子：
3.3
作者：
E. Wohl;K. Jaeger
通讯作者：
K. Jaeger
量化流域大型木材动态的最新进展：新方法和剩余挑战
影响因子：
25.2
作者：
V. Ruiz‐Villanueva;H. Piégay;A. Gurnell;R. Marston;M. Stoffel
通讯作者：
M. Stoffel
怀俄明州风河山脉冰川冰川的木材介导的地貌效应
影响因子：
3.9
作者：
E. B. Oswald;E. Wohl
通讯作者：
E. Wohl