基流
地表径流
永久冻土
过程线
水文学(农业)
环境科学
水流
土壤水分
地表水
流域
地质学
地下水流
地下水
土壤科学
海洋学
生态学
地理
岩土工程
环境工程
生物
地图学
作者
Sean K. Carey,William L. Quinton
摘要
Abstract 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. Copyright © 2005 John Wiley & Sons, Ltd.
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