Uncertainties of the 137Cs technique for validation of soil redistribution modelling in a semiarid meso-scale watershed
Uncertainties of the 137Cs technique for validation of soil redistribution modelling in a semiarid meso-scale watershed
复制标题
半干旱中尺度流域土壤再分配模型验证 137Cs 技术的不确定性
DOI：
10.1590/s0100-69162014000200004
复制
发表时间：
2014
影响因子：
1
通讯作者：
A. Andrello
中科院分区：
文献类型：
--
作者：
P. Medeiros;J. C. Araújo;A. Andrello
由于缺乏与沉积物有关的长期变量系列，流域管理人员不得不采用数学模型来模拟沉积物通量。由于沉积测量仪的安装和维护工作量很大，示踪剂已被指出是验证土壤再分布模型的一种替代方法。在这项研究中，137 Cs技术被用来评估WASA-SED模型的性能在本格流域（933平方公里），在巴西半干旱地区。质量，良好的协议之间发现137 Cs技术和WASA-SED模型的结果。尽管如此，数量上的巨大差异，高达两个数量级，发现两种方法之间。在137 Cs技术固有的不确定性中，参考清单的定义似乎是不精确的主要来源。此外，水沙通量的数学模型估计通常也呈现出很高的不确定性，造成定量差异的土壤再分布估计与两种方法。
Scarcity of long-term series of sediment-related variables has led watershed managers to apply mathematical models to simulate sediment fluxes. Due to the high efforts for installation and maintenance of sedimentological gauges, tracers have been pointed out as an alternative to validate soil redistribution modelling. In this study, the 137Cs technique was used to assess the WASA-SED model performance at the Bengue watershed (933 km²), in the Brazilian semiarid. Qualitatively, good agreement was found among the 137Cs technique and the WASA-SED model results. Nonetheless, quantitatively great differences, up to two orders of magnitude, were found between the two methods. Among the uncertainties inherent to the 137Cs technique, definition of the reference inventory seems to be a major source of imprecision. In addition, estimations of water and sediment fluxes with mathematical models usually also present high uncertainty, contributing to the quantitative differences of the soil redistribution estimates with the two methods.
使用 WASA-SED 模型模拟半干旱流域沉积物产量和连通性的时空模式
影响因子：
3.5
作者：
P. H. A. Medeiros;A. Güntner;T. Francke;G. L. Mamede;J. C. d. Araújo
通讯作者：
J. C. d. Araújo
使用 WASA-SED 模型模拟旱地的泥沙输出、滞留和水库沉积
影响因子：
5.1
作者：
E. N. Mueller;A. Güntner;T. Francke;G. Mamede
通讯作者：
G. Mamede