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首页> 外文期刊>Hydrological Processes >Evaluating runoff generation during summer using hydrometric, stable isotope and hydrochemical methods in a discontinuous permafrost alpine catchment
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Evaluating runoff generation during summer using hydrometric, stable isotope and hydrochemical methods in a discontinuous permafrost alpine catchment

机译：使用不连续多年冻土高山流域的水文，稳定同位素和水化学方法评估夏季的径流产生

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Research on runoff generation in catchments with discontinuous permafrost has focused primarily upon the role of surface organic layers and frozen soils (both permanent and seasonal). Much of this work has been hydrometric, with isotope and hydrochemical methods receiving only limited application in delineating old and new water contributions and chemically inferred hydrological pathways. In a small subarctic alpine catchment within the Wolf Creek Research Basin, Yukon, runoff generation processes were studied in the summer of 2001 using a mixed method approach to evaluate the mechanisms and pathways of flow from the hillslopes to the stream during rainfall events. Two storms had δ~(18)O isotopic ratios that differed significantly from baseflow and water within hillslopes, allowing for two-component hydrograph separation to infer new and old water contributions. Event water contributions ranged between 7 and 9%, exhibiting little variability despite the large differences in event water and stormflow volume. Utilizing δ~(18) O-dissolved organic carbon and δ_(18)O-specific conductance data, two tracer three-component hydrograph separations were attempted to isolate rainfall, water within the organic layer and mineral layer contributions to stormflow. Three-component separations suggest that water from the mineral soil dominates the stormflow hydrograph, yet the contribution of organic-layer water varies greatly depending upon the choice of tracers. Hydrometric data indicate that slopes with permafrost likely supply much of the stormflow water due to near-surface water tables and transmissive organic soils. However, this signal was not clearly discernable in the streamflow hydrochemistry. More integrated studies are required to establish a greater understanding of hillslope processes in mountainous discontinuous permafrost catchments.
机译：在具有不连续多年冻土的集水区，产生径流的研究主要集中在地表有机层和冻土（永久性和季节性）的作用上。这项工作大部分是水文测量，同位素和水化学方法在描述新旧水的贡献和化学推断的水文途径方面仅受到有限的应用。在育空地区沃尔夫克里克研究盆地内一个小的北极亚高山流域，2001年夏季使用混合方法研究了径流产生过程，以评估降雨事件期间从山坡流向河流的径流机理和路径。两次风暴的δ〜（18）O同位素比值与山坡内的基流和水量有显着差异，这使两部分水文图分离可以推断出新水和旧水的贡献。尽管事件水量和暴雨流量差异很大，但事件水量的贡献范围在7％至9％之间，几乎没有变化。利用δ〜（18）O溶解的有机碳和δ_（18）O的电导率数据，尝试使用两种示踪剂三组分水位图分离来分离降雨，有机层中的水和矿物层对暴雨的贡献。三成分分离表明，矿物质土壤中的水在暴雨水位图中占主导地位，而有机层水的贡献则取决于示踪剂的选择而变化很大。水文数据表明，由于近地表水位和有机土壤的渗透，多年冻土的斜坡可能会提供大量的暴雨水。但是，在水流水化学中不能清楚地辨别该信号。需要进行更多的综合研究，以进一步了解山区非连续多年冻土流域的山坡过程。

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