李同录, 汪颖, 胡向阳, 等. 2022. 厚层非饱和黄土中优势流和活塞流的讨论[J]. 工程地质学报, 30(6): 1842-1848. doi: 10.13544/j.cnki.jeg.2022-0511.
    引用本文: 李同录, 汪颖, 胡向阳, 等. 2022. 厚层非饱和黄土中优势流和活塞流的讨论[J]. 工程地质学报, 30(6): 1842-1848. doi: 10.13544/j.cnki.jeg.2022-0511.
    Li Tonglu, Wang Ying, Hu Xiangyang, et al. 2022. Discussion on preferential flow and piston flow in thick loess vadose zone[J]. Journal of Engineering Geology, 30(6): 1842-1848. doi: 10.13544/j.cnki.jeg.2022-0511.
    Citation: Li Tonglu, Wang Ying, Hu Xiangyang, et al. 2022. Discussion on preferential flow and piston flow in thick loess vadose zone[J]. Journal of Engineering Geology, 30(6): 1842-1848. doi: 10.13544/j.cnki.jeg.2022-0511.

    厚层非饱和黄土中优势流和活塞流的讨论

    DISCUSSION ON PREFERENTIAL FLOW AND PISTON FLOW IN THICK LOESS VADOSE ZONE

    • 摘要: 厚层黄土中包气带水的运动方式一直存在争议。一种认为是活塞流,另一种认为是优势流,也有人认为两者并存。本文通过现场观测和两个模型试验,揭示活塞流是包气带中水分的特有的运移方式;基于非饱和土的土水特征,进一步证明优势流仅存在于饱和土中。自然界的黄土多处于非饱和状态,因此活塞流是黄土包气带中水的主要运移方式,而优势流是暂态和局部的,仅出现在降雨时期的浅层饱和区,或者低洼的汇水区。黄土中的垂直节理、卸荷裂隙、动物洞穴和植物根孔等优势通道是地表汇流的排水通道,而不是地下水的补给通道。

       

      Abstract: The mode of water migration in thick loess vadose zone has always been argued on preferential flow and piston flow. In this paper,the authors conducted in-situ observations and two model tests to demonstrate that piston flow is the unique way of water migration in vadose zone in thick loess. Based on flow behavior of unsaturated soil,it is also verified that preferential flow can only exist in saturated soils. Loess in natural condition mainly exists as unsaturated state,so piston flow is the dominant flow mode in loess. Preferential flow just occurs in shallow saturated zone locally and in the raining periods temporally. In addition,preferential paths in loess,such as vertical joints,load release cracks,animal caves and root pores are the channels for surface water discharge rather than those for groundwater recharge.

       

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