The sediment budget of a highly dynamic mesoscale catchment: The River Isábena
The sediment budget of a highly dynamic mesoscale catchment: The River Isábena
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DOI：
10.1016/j.geomorph.2011.08.020
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发表时间：
2012-02
期刊：
影响因子：
3.9
通讯作者：
J. López-Tarazón;R. Batalla;D. Vericat;T. Francke
中科院分区：
文献类型：
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作者：
J. López-Tarazón;R. Batalla;D. Vericat;T. Francke
本文介绍了伊萨贝纳盆地的泥沙平衡，这是一个位于比利牛斯山脉中部的高度动态的445平方公里的集水区，由高度侵蚀的地区(即荒地)组成。2007-2009年期间的预算是按照一种方法编制的，该方法允许对悬浮泥沙浓度的间歇性测量进行插补，并能够随后计算泥沙负荷。数据可以详细说明每个子流域对集水口产水量和产沙量的贡献。年平均泥沙负荷为235,000−1，比产沙量达到2000 t km−2y−1，表明沉积活动非常活跃，特别是在维拉卡利和拉斯卡拉亚河流域，是大多数荒地所在的地方。整个伊萨贝纳获得的比含沙量为527tkm−2y−1，对于这样一个中尺度盆地来说是一个很高的数值。结果表明，该区域的一小部分(即1%)控制了大部分流域的总泥沙贡献。输沙率(初级来源输入的泥沙与流域输出的泥沙之比)估计约为90%，而河道内储存平均占年负荷的5%。泥沙来源(即荒地)和转移路径(即河道)之间的高度连通性加剧了当地泥沙生产对流域泥沙产量的影响，对于这种规模的流域来说，这是一个相当不寻常的事实。
The paper presents the sediment budget of the Isábena basin, a highly dynamic 445-km2catchment located in the Central Pyrenees that is patched by highly erodible areas (i.e., badlands). The budget for the period 2007–2009 is constructed following a methodology that allows the interpolation of intermittent measurements of suspended sediment concentrations and enables a subsequent calculation of sediment loads. Data allow specification of the contribution of each subbasin to the water and sediment yield in the catchment outlet. Mean annual sediment load was 235,000ty−1. Specific sediment yield reached 2000tkm−2y−1, a value that indicates very high sedimentary activity, especially in the case of Villacarli and Lascuarre subcatchments, were most badlands are located. The specific sediment yield obtained for the entire Isábena is 527tkm−2y−1, a high value for such a mesoscale basin. Results show that a small part of the area (i.e., 1%) controls most of the catchment's gross sediment contribution. Sediment delivery ratio (ratio between sediment input from primary sources and basin export) has been estimated at around 90%, while in-channel storage represents the 5% of the annual load on average. The high connectivity between sediment sources (i.e., badlands) and transfer paths (i.e., streamcourses) exacerbates the influence of the local sediment production on the catchment's sediment yield, a quite unusual fact for a basin of this scale.