首页> 外文期刊>Water resources research >Temporal variation in end-member chemistry and its influence on runoff mixing patterns in a forested, Piedmont catchment
【24h】

Temporal variation in end-member chemistry and its influence on runoff mixing patterns in a forested, Piedmont catchment

机译:树木茂密的皮埃蒙特流域最终成员化学物质的时间变化及其对径流混合模式的影响

获取原文
获取原文并翻译 | 示例
           

摘要

Runoff mixing patterns for base flow and 42 storm events were investigated for a 3 year period (2008-2010) in a 12 ha forested catchment in the mid-Atlantic, Piedmont region of the USA. Eleven distinct runoff sources were sampled independently and included: precipitation, throughfall, stemflow, litter leachate, wetland soil water, tension soil water, shallow groundwater, groundwater seeps, hyporheic water, riparian groundwater, and deep groundwater. A rigorous end-member mixing analysis (EMMA) was implemented and all base flow, storm-flow, and end-member chemistries were evaluated in a two-dimensional mixing space. End-members enclosed stream water chemistry and displayed a systematic continuum in EMMA space. Base-flow chemistry of stream waters was similar to groundwater seeps. Storm-event runoff was attributed to contributions from surficial sources (precipitation, throughfall, stemflow, and litter leachate) on the rising limb of the discharge hydrograph that was followed by soil and shallow groundwater sources on the recession limb of the hydrograph. The shapes of the storm-event hysteresis loops (wide versus tight, linear patterns) varied with hydrologic conditions from wet, hydrologically well-connected conditions to a dry, disconnected state. Detailed temporal data on end-member chemistry allowed us to explain the changes in stream water hysteresis patterns and runoff mixing space to shifts in end-member chemistry that occurred as the catchment became hydrologically disconnected. These results highlight the need to recognize the temporal variation in end-member chemistry as a function of catchment wetness and the need to collect high-frequency data on both-stream water as well as potential runoff end-members to better characterize catchment flow paths and mixing responses.
机译:在美国皮埃蒙特州中大西洋地区一个12公顷的森林集水区中,调查了3年期间(2008-2010年)的基础流量和42次暴雨事件的径流混合模式。分别对11个不同的径流源进行了采样,包括:降水,穿透水,茎流,垃圾渗滤液,湿地土壤水,张力土壤水,浅层地下水,地下水渗漏,高渗水,河岸地下水和深层地下水。进行了严格的末端成员混合分析(EMMA),并在二维混合空间中评估了所有基本流量,暴风雨流和末端成员的化学性质。最终成员封闭了流水化学,并在EMMA空间中展示了系统的连续体。溪流水的基流化学性质类似于地下水渗漏。暴雨事件的径流归因于排放水位图上升沿的表层来源(降水,穿透,茎流和垃圾渗滤液)的贡献,其次是水位图下降沿的土壤和浅层地下水源。暴雨事件迟滞回线的形状(宽相对于紧密的线性模式)随水文条件的变化而变化,从潮湿的水文条件良好的连接状态到干燥的非连接状态。有关末端成员化学物质的详细时间数据使我们能够解释溪流水滞后模式和径流混合空间的变化,以说明随着流域水文分离而发生的末端成员化学物质的变化。这些结果突出表明,需要认识到末端成员化学物质随时间的变化是集水区湿度的函数,并且需要收集有关溪流水以及潜在径流末端成员的高频数据,以更好地表征集水区的流动路径和混合反应。

著录项

  • 来源
    《Water resources research》 |2013年第4期|1828-1844|共17页
  • 作者单位

    Plant and Soil Sciences, University of Delaware, Newark, Delaware, USA,University of Delaware, 264 Townsend Hall, 531 S College Ave., Newark, DE 19716, USA;

    Plant and Soil Sciences, University of Delaware, Newark, Delaware, USA;

    Plant and Soil Sciences, University of Delaware, Newark, Delaware, USA;

    Plant and Soil Sciences, University of Delaware, Newark, Delaware, USA;

    Plant and Soil Sciences, University of Delaware, Newark, Delaware, USA;

    Biological Systems Engineering, Virginia Tech, Blacksburg, Virginia, USA;

    College of Environmental Science and Forestry, State University of New York, Syracuse, New York, USA;

    Department of Geology & Geography, Statesboro, Georgia, USA;

    College of Environmental Science and Forestry, State University of New York, Syracuse, New York, USA;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号