...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Land Degradation and Development >Validating the Use of Cs-137 Measurements to Derive the Slope Component of the Sediment Budget of a Small Rangeland Catchment in Southern Italy
【24h】

Validating the Use of Cs-137 Measurements to Derive the Slope Component of the Sediment Budget of a Small Rangeland Catchment in Southern Italy

机译：验证使用Cs-137测量值得出意大利南部小牧场集水区泥沙收支的坡度分量

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The sediment budget is a key concept and tool for characterizing the mobilization, transfer and storage of fine sediment within a catchment. Caesium-137 measurements can provide valuable information on gross and net erosion rates associated with sheet and rill erosion that can be used to establish the slope component of a catchment sediment budget. However, there is a need to validate the use of Cs-137 measurements for this purpose, because their reliability has sometimes been questioned. The study reported focuses on a small (304ha) steepland (mean slope 37%) catchment in Southern Italy. It exploits the availability of information on the medium-term sediment output from the catchment provided by the construction of a reservoir at its outlet in 1978 and the existence of estimates of soil redistribution rates derived from Cs-137 measurements made on 68 replicate soil cores collected from the slopes of a substantial proportion of the catchment in 2001, to validate the use of Cs-137 measurements to construct the slope component of the catchment sediment budget. An additional 50 replicate soil cores were collected from the catchment slopes for Cs-137 analysis, to complement the data already available. Nine cores collected from the area occupied by the reservoir were used to estimate the mean annual sediment input to the reservoir. In the absence of evidence that the poorly developed channel system in the catchment was either a significant sediment source or sink, it was possible to directly compare the estimate of net soil loss from the catchment slopes (733Mgha(-1)y(-1)) with the estimate of sediment output from the catchment provided by the reservoir deposits (752Mgha(-1)y(-1)). Taking account of the uncertainties involved, the close agreement of the two values is seen as providing a convincing validation of the use of Cs-137 measurements to both estimate soil redistribution rates and as a basis for constructing the slope component of the sediment budget of a small catchment. Copyright (c) 2015 John Wiley & Sons, Ltd.
机译：沉积物预算是表征集水区内细小沉积物的动员，转移和存储特征的关键概念和工具。铯137的测量可以提供与薄板和小溪侵蚀有关的总侵蚀率和净侵蚀率的有价值的信息，这些信息可用于确定集水区沉积物预算的斜率部分。但是，由于有时会质疑Cs-137测量的可靠性，因此有必要对其进行验证。这项研究报告的重点是意大利南部的一个小面积（304公顷）的陡坡流域（平均坡度为37％）。它利用了1978年在其出口处建造水库而从集水区获得的中期沉积物产出的信息的可用性，以及利用对收集的68个重复土壤核心进行的Cs-137测量得出的土壤再分配速率的估计值的存在。从2001年集水区很大比例的坡度中，验证了使用Cs-137测量值来构建集水区沉积物预算的坡度分量。从流域斜坡收集了另外的50个重复土壤核用于Cs-137分析，以补充现有数据。从水库所占地区收集的九个岩心被用来估算平均每年输入水库的沉积物。在没有证据表明流域内渠道系统发育不佳是主要的泥沙源或汇的证据的情况下，有可能直接比较流域坡度的净土壤流失估计值（733Mgha（-1）y（-1） ）以及由水库沉积物（752Mgha（-1）y（-1））提供的集水区的泥沙产出估算。考虑到所涉及的不确定性，这两个值的紧密一致性被视为提供了令人信服的验证，即使用Cs-137测量值来估算土壤的重新分配速率，并且是构建沙丘沉积物预算的斜率成分的基础。小流域。版权所有（c）2015 John Wiley＆Sons，Ltd.

著录项

相似文献

  • 外文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号