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首页> 外文期刊>The Science of the Total Environment >Runoff change and sediment source during rainstorms in an ecologically constructed watershed on the Loess Plateau, China
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Runoff change and sediment source during rainstorms in an ecologically constructed watershed on the Loess Plateau, China

机译：黄土高原生态建设小流域暴雨过程中径流变化与泥沙源

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摘要

The sediment-reducing effect of check dams and the safety issues following dam breaks are long-standing concerns. This study analyzed the runoff change and sediment source during rainstorms in a small watershed using a multivariate mixed model and a comparative analysis of watersheds. The problem of sediment loss from dammed farmland following check dam break during rainstorms was evaluated. The results showed that the flood peak lag time (PLT) was significantly influenced by pre-soil moisture in cases of small amounts of rainfall but not during rainstorms. Ecological construction significantly reduced the linear correlation between rainfall and runoff modulus (RM). The reduction in sediment delivery modulus (SDM) due to the check dam was more significant than that in RM. The reduction in RM and SDM under rainstorm conditions were 16%-74% and 53%-93%, respectively.The contributions of inter-gully and gully lands to the sediment deposited in clammed farmland during a large rainstorm on July 26, 2017 were 38.07% and 61.93%, respectively. Soil erosion remained significant during large rainstorms. The increase in vegetation coverage on the hill slope increased the amount of sediment from gully lands. Check dam breaches have accounted for a loss of only 1.2% of the total area of the dammed farmland, and thus have not caused a large loss of sediment. However, breaches in them clearly increased the coefficient of variation of RM and SDM. Therefore, check dams have a critical effect on controlling sediment delivery at the watershed scale. Dam breaks do not result in a large percentage of sediment loss in the clammed farmland. (C) 2019 Elsevier B.V. rights reserved.
机译：长期以来，检查坝的减淤作用和溃坝后的安全问题一直是人们关注的问题。本研究使用多元混合模型和流域的对比分析，分析了小流域暴雨期间的径流变化和泥沙源。评估了暴风雨期间检查大坝破裂后，坝上农田的泥沙流失问题。结果表明，在降雨少的情况下，洪水高峰的滞后时间（PLT）受到土壤前水分的显着影响，而在暴雨期间则没有。生态建设大大减少了降雨与径流模量（RM）之间的线性关系。止水坝导致的泥沙输送模量（SDM）的降低比RM更为显着。在暴雨条件下，RM和SDM的减少分别为16％-74％和53％-93％.2017年7月26日的一场大暴雨期间，沟间和沟壑地带对淤积农田沉积物的贡献为：分别为38.07％和61.93％。在大暴雨期间，土壤侵蚀仍然很严重。山坡上植被的增加增加了沟壑区的沉积物数量。止水坝的破坏仅占被水坝农田总面积的1.2％，因此并未造成大量的沉积物流失。但是，这些漏洞明显增加了RM和SDM的变异系数。因此，防洪坝对于控制流域尺度的泥沙输送具有至关重要的作用。溃坝不会在围垦的农田中造成大量的泥沙流失。 （C）2019 Elsevier B.V.版权所有。

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  • 来源
    《The Science of the Total Environment》 |2019年第10期|968-974|共7页
  • 作者

    Li Peng; Xu Guoce; Lu Kexin; Zhang Xiaoming; Shi Peng; Bai Lulu; Ren Zongping; Pang Guowei; Xiao Lie; Gao Haidong; Pan Minghang;

  • 作者单位

    Xian Univ Technol, State Key Lab Ecohydraul Northwest Arid Reg China, Xian 710048, Shaanxi, Peoples R China;

    Xian Univ Technol, State Key Lab Ecohydraul Northwest Arid Reg China, Xian 710048, Shaanxi, Peoples R China;

    Xian Univ Technol, State Key Lab Ecohydraul Northwest Arid Reg China, Xian 710048, Shaanxi, Peoples R China;

    China Inst Water Resources & Hydropower Res, State Key Lab Simulat & Regulat Water Cycle River, Beijing 100048, Peoples R China;

    Xian Univ Technol, State Key Lab Ecohydraul Northwest Arid Reg China, Xian 710048, Shaanxi, Peoples R China;

    Xian Univ Technol, State Key Lab Ecohydraul Northwest Arid Reg China, Xian 710048, Shaanxi, Peoples R China;

    Xian Univ Technol, State Key Lab Ecohydraul Northwest Arid Reg China, Xian 710048, Shaanxi, Peoples R China;

    Northwest Univ, Coll Urban & Environm Sci, Xian 710127, Shaanxi, Peoples R China;

    Xian Univ Technol, State Key Lab Ecohydraul Northwest Arid Reg China, Xian 710048, Shaanxi, Peoples R China;

    Xian Univ Technol, State Key Lab Ecohydraul Northwest Arid Reg China, Xian 710048, Shaanxi, Peoples R China;

    Xian Univ Technol, State Key Lab Ecohydraul Northwest Arid Reg China, Xian 710048, Shaanxi, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Inter-gully land; Gully land; Check dam; Vegetation restoratIon; Check dam breach;

    机译：沟壑间;沟壑;检查水坝;恢复植被;检查水坝破坏;

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