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首页> 外文期刊>International journal of communication systems >Tracer-based evidence of heterogeneity in subsurface flow and storage within a boreal hillslope
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Tracer-based evidence of heterogeneity in subsurface flow and storage within a boreal hillslope

机译：基于博尔山坡内部流量和储存中的基于特拉克的证据

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Runoff from boreal hillslopes is often affected by distinct soil boundaries, including the frozenboundary and the organic‐mineral boundary (OMB), where highly porous and hydraulically conductiveorganic material overlies fine‐grained mineral soils. Viewed from the surface, groundcover appears as a patchwork on sub‐meter scales, with thick, moss mats interspersed withlichen‐covered, silty soils with gravel inclusions. We conducted a decameter‐scale subsurfacetracer test on a boreal forest hillslope in interior Alaska to quantify locations and mechanismsof transport and storage in these soils, focusing on the OMB. A sodium bromide tracer was addedas a slug addition to a pit and sampled at 40 down‐gradient wells, screened primarily at the OMBand within a 7 × 12 m well field. We maintained an elevated head in the injection pit for 8.5 hr tosimulate a storm. Tracer breakthrough velocities ranged from <0.12 to 0.93 m hr~（−1）, with thehighest velocities in lichen‐covered soils. After 12 hr and cessation of the elevated head, thetracer coalesced and was only detected in thick mosses at a trough in the OMB. By 24 hr, approximately17% of the tracer mass could be accounted for. The majority of the mass loss occurredbetween 4 and 12 hr, while the tracer was in contact with lichen‐covered soils, which is consistentwith tracer transport into deeper flow paths via preferential flow through discrete gravellyareas. Slow breakthroughs suggest that storage and exchange also occurred in shallow soils, likelyrelated to saturation and drainage in fine‐grained mineral soils caused by the elevated hydraulichead. These findings highlight the complex nature of storage and transmission of water and solutesfrom boreal hillslopes to streams and are particularly relevant given rapid changes to borealenvironments related to climate change, thawing permafrost and increasing fire severity.
机译：来自Boreal Hillslopes的径流通常受到不同土壤边界的影响，包括冷冻边界和有机矿区边界（OMB），高度多孔和液压导电有机材料覆盖细粒矿物土壤。从地面看，地面封面看起来是镜头秤上的拼凑，厚厚的苔藓垫相互作用地衣覆盖，粉碎土壤，砾石夹杂物。我们进行了欺骗性的地下在内部阿拉斯加的北面森林山坡上的跟踪器测试量化地点和机制在这些土壤中的运输和储存，重点放在OMB上。加入溴化钠示踪剂作为坑的Slug添加并在40个下梯度井中取样，主要在OMB处筛选在7×12米的井里。我们在注射坑中保持了8.5小时的升高模拟风暴。示踪剂突破速度范围为<0.12至0.93米HR〜（-1），其中地衣覆盖的土壤中的最高速度。经过12小时和升高的头部停止，示踪剂聚结，仅在恒温槽中检测到厚苔。 24小时，大约可能会占追踪批量的17％。大部分大众损失发生了在4到12小时之间，而示踪剂与地衣覆盖的土壤接触，这是一致的通过离散砾石的优先流动，示踪剂传输进入更深的流动路径地区。缓慢的突破表明，可能的储存和交换也发生在浅层土壤中与升高的液压造成的细粒矿物土壤中的饱和和排水有关头。这些发现突出了水和溶质的储存和传输的复杂性质从Boreal Hillslopes到溪流，对北方的快速变化特别相关与气候变化有关的环境，解冻永久冻土和增加火灾严重程度。

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