干热河谷冲沟发育区不同层位土体抗冲性研究
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国家重点基础科学(973)研究发展计划项目"横断山地水土作用失衡机制与灾害风险评价"(2015CB452704);中国科学院"西部之光"重点项目(Y4R2060060);中国科学院水利部成都山地灾害与环境研究所"青年百人团队"项目(SDSQB-2011-01);四川省应用基础研究计划项目(2014JY0067)


Soil Anti-scourability of Different Horizons in Gully Developed Area of Dry-hot Valley Region
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    摘要:

    [目的] 对干热河谷冲沟发育区不同层位土体抗冲性进行比较研究,为冲沟侵蚀治理措施制定提供科学依据。[方法] 通过原状土槽冲刷法进行试验研究。[结果] (1)各层土体抗冲性均随冲刷时间呈幂函数增大(除第Ⅳ,Ⅴ层土体因裂隙的存在而在冲刷前期表现为抗冲性能随冲刷时间呈线性增加外);(2)不同层位土体初始抗冲性差异显著,依次为:Ⅰ层 >Ⅱ层 >Ⅵ层 >Ⅲ层,Ⅳ层>Ⅴ层。[结论] 研究区各层位土体抗冲性在存在差异,总体上表现为随土层深度的增加呈旋回式减小。

    Abstract:

    [Objective] The anti-scourabilities of soils from different horizons in gully developed area of dry-hot valley region were compared in order to provide a scientific basis for gully erosion control.[Methods] Undisturbed soil sampled from six different horizons were eroded with scour trough in laboratory.[Results] (1) Except layers of Ⅳ and Ⅴ, the soil anti-scourability of other horizons increased in a power function with the scouring time. Resulted from the existence of fissure, the two layers exhibited a linear function at the scouring earlier stage.(2) There were significant differences in soil anti-scourability among each horizon with ranks as:layer Ⅰ >layer Ⅱ >layer Ⅵ >layer Ⅲ, layer Ⅳ>layer Ⅴ.[Conclusion] Soil anti-scourability decreased with the depth of each horizon in a gyratory way with ranks of layer Ⅰ >layer Ⅱ >layer Ⅲ, and layer Ⅳ >layer Ⅴ >layer Ⅵ.

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郑学用,熊东红,张素,鲜纪绅,杨丹,张宝军,郭敏.干热河谷冲沟发育区不同层位土体抗冲性研究[J].水土保持通报,2015,35(6):101-105

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  • 收稿日期:2014-10-11
  • 最后修改日期:2014-11-21
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  • 在线发布日期: 2016-04-05
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