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首页> 外文期刊>Land Degradation and Development >CHANGING SEDIMENT YIELD AND SEDIMENT DYNAMICS IN THE KAROO UPLANDS, SOUTH AFRICA; POST-EUROPEAN IMPACTS
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CHANGING SEDIMENT YIELD AND SEDIMENT DYNAMICS IN THE KAROO UPLANDS, SOUTH AFRICA; POST-EUROPEAN IMPACTS

机译：南非卡鲁乌普兰斯的沉积物产量和沉积物动力学变化;后欧洲的影响

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摘要

We provide an overview of published results and a significant body of new data from an ongoing research programme designed to reconstruct sediment yields and sources in small (<60km~2) catchments in the Eastern Cape, South Africa over the last 150 years. Our analysis of four catchments has determined that sediment yield increased significantly in the latter half of the 20th century but that the exact timing of these increases was different in each of the four catchments. In two high altitude locations, sediment yield increases were not associated with a significant change in sediment source although, in one case, areas of former cultivation appear to have made a slightly greater contribution since the 1960s. In a third catchment, increases in sediment yield appear to have been driven by the development of badlands and by an increase in connectivity between the badlands and the main channel network in the 1960s. In the fourth catchment, increased connectivity between the main catchment and dam occurred as a result of the construction of a causeway to carry a main road and by the construction of culverts beneath the road. Occasional changes in sediment source have also been identified in the sedimentary record, but these were not linked directly toroad construction. Research to date shows the complexity of sediment delivery in these semi-arid catchment systems and emphasises the need to combine sediment yield with source ascription to better understand the dynamics of these systems. Copyright
机译：我们提供了已发表的研究结果的概述，以及正在进行的研究计划的大量新数据，这些研究计划旨在重建过去150年来南非东开普省小面积（<60km〜2）流域的沉积物产量和来源。我们对四个流域的分析已确定，在20世纪下半叶，沉积物的产量显着增加，但四个流域中每个流域的增加量的确切时机都不同。在两个高海拔地区，沉积物产量的增加与沉积物来源的显着变化无关，尽管在一种情况下，自1960年代以来，以前耕种的地区似乎做出了更大的贡献。在第三个流域，泥沙产量的增加似乎是由荒地的发展以及1960年代荒地与主要河道网络之间的连通性增加所驱动的。在第四个流域中，由于修建了一条承载主干道的堤道以及在该道路下方修建了涵洞，导致了主要流域与大坝之间的连通性增加。在沉积记录中也已经确定了沉积物源的偶然变化，但这些变化与公路建设没有直接关系。迄今为止的研究表明，在这些半干旱集水系统中，泥沙输送的复杂性，并强调需要将泥沙产量与来源归因结合起来，以便更好地了解这些系统的动态。版权

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