Variability of in-channel sediment storage in a river draining highly erodible areas (the Isábena, Ebro Basin)
Variability of in-channel sediment storage in a river draining highly erodible areas (the Isábena, Ebro Basin)
复制标题
高度侵蚀地区（伊萨贝纳、埃布罗盆地）的河流河道内沉积物储存量的变化
DOI：
10.1007/s11368-014-0957-6
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发表时间：
2014
影响因子：
3.6
通讯作者：
R. Batalla
中科院分区：
文献类型：
--
作者：
G. Piqué;J. López;R. Batalla
目的河道内泥沙蓄积是流域泥沙收支的基本组成部分。沉积物保持储存状态，直到一股合适的水流重新悬浮并将其转移到下游。本文的目标是：(1)量化BeasáBena河的河道泥沙储量及其时空动态。BeasáBena河是比利牛斯山脉中南部(埃布罗盆地)高侵蚀区(荒地)的一个中尺度山区集水区。(2)分析干流河道泥沙储量的变化与主要支流产沙量的关系。材料和方法利用再悬浮圆柱体对14个干流断面的河道泥沙储量进行季节性测量(2011年冬季至2012年冬季)。在每个部分至少采样三个位置，并应用两种水平的搅动。通过取样，可以确定河流中某一给定点的单位表面积上累积的沉淀量；根据这些数据，可以估算出伊萨贝纳河主干河床的总库存量。结果与讨论结果表明，黄河干流泥沙存在着一个年沉积周期，冬季在荒地产生泥沙，春季进入主槽，夏季蓄水，最后通过秋季洪水排出流域。观测到了明显的空间变异性；紧邻主要支流下游的地段(即主要是维拉卡利)通常在河床中持有更多的泥沙。来自支流的径流和泥沙输入是决定泥沙储量及其时空动态的最重要因素。伊萨贝纳河的总产沙量远高于河道内的泥沙蓄积量。结论这一发现证实了先前发表的一种假设，即细颗粒泥沙在水系中的平均停留时间约为1年，流域的输沙率超过90%；这两个特征都与产区(荒地)和河网之间的高度连通性有关，也与基流的作用有关，允许泥沙从流域持续输出。
PurposeIn-channel sediment storage is a fundamental component of a river basin’s sediment budget. Sediment remains stored until a competent flow re-suspends and transfers it downstream. The objectives of this paper are: (1) to quantify in-channel sediment storage and its spatial and temporal dynamics in the River Isábena, a mesoscale mountainous catchment draining highly erodible areas (badlands) in the south central Pyrenees (Ebro basin) and (2) to analyse changes in storage in the mainstem channel in relation to sediment yield from the main tributaries.Materials and methodsIn-channel sediment storage was measured seasonally (from winter 2011 to winter 2012) at 14 mainstem cross-sections using a re-suspension cylinder. A minimum of three locations were sampled at each section, and two levels of agitation were applied. Samples allowed determination of the amount of sediment accumulated per unit surface area at a given point in the river; estimates of the total storage in the bed of the mainstem Isábena were derived from these data. In addition, main five tributaries were monitored for discharge and suspended sediment transport.Results and discussionResults show an annual sedimentary cycle, with the sediment being produced in badlands during winter, transferred to the main channel during spring, stored in the river during summer and, finally, exported out of the basin by the autumn floods. Marked spatial variability was observed; sections located immediately downstream from the main tributaries (i.e. mainly Villacarli) generally held larger amounts of sediment in the bed. Runoff and sediment inputs from the tributaries were the most important factors determining sediment storage and its spatial and temporal dynamics. The overall sediment yield of the Isábena was much higher than the in-channel sediment storage, despite the large amounts stored in the channel.ConclusionsThis finding corroborates a previous published hypothesis that fine sediment in the drainage network has a mean residence time of the order of 1 year and that the basin’s delivery ratio exceeds 90 %; both of these characteristics can be related to the high connectivity between production areas (badlands) and the river network, and to the role of baseflows allowing continuous export of sediment from the catchment.
影响因子：
3.9
作者：
J. López-Tarazón;R. Batalla;D. Vericat;T. Francke
通讯作者：
J. López-Tarazón;R. Batalla;D. Vericat;T. Francke
比利牛斯山脉中部高度易侵蚀的伊萨贝纳流域的子流域径流、泥沙动力学和产沙量分析
影响因子：
3.6
作者：
T. Francke;S. Werb;E. Sommerer;J. A. López-Tarazón
通讯作者：
J. A. López-Tarazón