In-channel sediment storage in a highly erodible catchment: the River Isábena (Ebro Basin, Southern Pyrenees)
In-channel sediment storage in a highly erodible catchment: the River Isábena (Ebro Basin, Southern Pyrenees)
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高度易侵蚀流域内的河道内沉积物储存：伊萨贝纳河（埃布罗盆地，南比利牛斯山脉）
DOI：
10.1127/0372-8854/2011/0045
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发表时间：
2011
影响因子：
2.2
通讯作者：
Damià Vericat Querol
中科院分区：
文献类型：
--
作者：
J. López;R. Batalla;Damià Vericat Querol
河道内细颗粒泥沙储存，特别是在排出高腐蚀性物质的地区，构成了流域泥沙收支的重要组成部分。当流域的产沙量大于河流的输送能力时，就会出现这种现象，导致河道沿线堆积大量细粒。在一个平均水文年(2007-2008年)，对伊萨贝纳河一个类似于3公里长河段的河道内泥沙储存进行了研究。伊萨贝纳河排水面积为445公里(2)。它位于比利牛斯山脉南部，河网流经极易侵蚀的物质区域，产生了大量的悬浮泥沙。研究期间的河道泥沙蓄积量估计约为679吨，相当于流域出口处年悬移质输沙量的0.32%。将研究河段的泥沙蓄积量外推至主航道全长(45公里)，总蓄沙量为9810t，占全年总输沙量的4.7%。通道内存储同时显示时间和空间趋势。与前者相比，枯水期间泥沙不断堆积，而后者则表现为下游泥沙堆积增加。结果表明，储存在河道中的细粒泥沙可能是排放高腐蚀性物质的河流(如伊萨贝纳河)悬沙收支的重要组成部分。
In-channel fine-sediment storage, especially in areas draining highly erodible materials, constitutes an important part of the sediment budget of a drainage basin. This phenomenon occurs when sediment production in the basin is greater than the river's transport capacity, resulting in large accumulations of fines along the river channel. In-channel sediment storage has been studied in a similar to 3-km channel length reach of the River Isabena during an average hydrological year (2007-2008). The River Isabena drains an area of 445 km (2). It is located at the Southern Pyrenees and the channel network flows through an area of extremely erodible materials producing an enormous amount of suspended sediment. Total in-channel sediment storage for the study period has been estimated at approximately 679 t, which equates to 0.32% of the annual suspended sediment load calculated at the basin's outlet. Sediment storage values obtained in the study reach have been extrapolated to the whole main channel length (45 km), resulting in a total storage of 9,810 t, representing the 4.7% of the annual total load. In-channel storage shows both temporal and spatial trends. In relation to the former, sediment is continuously accumulated during low-flows while the latter shows that sediment accumulation increases in the downstream direction. Results suggest that the fine-grained sediment stored in the channel may represent an important component of the suspended sediment budget of rivers draining highly erodible materials such as the River Isabena.