• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Water resources research >Runoff and solute mobilization processes in a semiarid headwater catchment
【24h】

Runoff and solute mobilization processes in a semiarid headwater catchment

机译：半干旱水源流域的径流和溶质动员过程

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Runoff and solute transport processes contributing to streamflow were determined in a small headwater catchment in the eastern Murray-Darling Basin of Australia using hydrometric and tracer methods. Streamflow and electrical conductivity were monitored from two gauges draining a portion of the upper catchment area (UCA) and a saline scalded area, respectively. Runoff in the UCA was related to the formation of a seasonally perched aquifer in the near-surface zone (0-0.4 m). A similar process was responsible for runoff generation in the saline scalded area. However, saturation in the scald area was related to the proximity of groundwater rather than low subsurface hydraulic conductivity. Because of higher antecedent water content, runoff commenced earlier in winter from the scald than did the UCA. Additionally, areal runoff from the scald was far greater than from the UCA. Total runoff from the UCA was higher than the scald (15.7 versus 3.5 mL), but salt export was far lower (0.6 and 5.4 t for the UCA and scald area, respectively) since salinity of the scald runoff was far higher than that from the UCA, indicating the potential impact of saline scalded areas at the catchment scale. End-member mixing analysis modeling using six solutes indicated that most runoff produced from the scald was "new" (40-71%) despite the proximity of the groundwater surface and the high antecedent moisture levels. This is a reflection of the very low hydraulic conductivity of soils in the study area. Nearly all chloride exported to the stream from the scald emanated from the near-surface zone (77-87%). Runoff and solute mobilization processes depend upon seasonal saturation occurring in the near-surface zone during periods of low evaporative demand and generation of saturated overland flow.
机译：使用水压法和示踪法确定了澳大利亚东部默里-达令盆地上游小流域的径流和溶质运移过程。从分别排干一部分上部集水区（UCA）和盐渍水域的两个仪表监测流量和电导率。 UCA中的径流与近地表区域（0-0.4 m）中季节性栖息的含水层的形成有关。盐渍地区的径流产生过程类似。但是，烫伤区域的饱和度与地下水的接近性有关，而不是与地下水力传导率低有关。由于前期含水量较高，因此冬季起水比起UCA起早。此外，烫伤后的面径流远远大于UCA。来自UCA的总径流高于烫伤后的径流（15.7对3.5 mL），但盐的出口量要低得多（UCA和烫伤区域分别为0.6和5.4 t），因为烫伤后的径流的盐度远高于来自盐渍地的盐分。 UCA，表明流域尺度上盐渍区域的潜在影响。使用六种溶质的最终成员混合分析模型表明，尽管靠近地下水表面和较高的前期水分含量，但烫伤后产生的大部分径流都是“新的”（40-71％）。这反映了研究区域土壤的水力传导率非常低。几乎所有从头皮排出到溪流的氯化物都从近地表区域散发出来（77-87％）。径流和溶质的运移过程取决于在蒸发需求低和产生饱和陆上流量期间近地表区域中发生的季节性饱和。

著录项

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