...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Ground water >Sensitivity of Simulated Hyporheic Exchange to River Bathymetry: The Steinlach River Test Site
【24h】

Sensitivity of Simulated Hyporheic Exchange to River Bathymetry: The Steinlach River Test Site

机译：模拟的氢交换对河测深的敏感性：Steinlach河试验场

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

This study determines the aspects of river bathymetry that have the greatest influence on the predictive biases when simulating hyporheic exchange. To investigate this, we build a highly parameterized HydroGeoSphere model of the Steinlach River Test Site in southwest Germany as a reference. This model is then modified with simpler bathymetries, evaluating the changes to hyporheic exchange fluxes and transit time distributions. Results indicate that simulating hyporheic exchange with a high-resolution detailed bathymetry using a three-dimensional fully coupled model leads to nested multiscale hyporheic exchange systems. A poorly resolved bathymetry will underestimate the small-scale hyporheic exchange, biasing the simulated hyporheic exchange towards larger scales, thus leading to overestimates of hyporheic exchange residence times. This can lead to gross biases in the estimation of a catchment's capacity to attenuate pollutants when extrapolated to account for all meanders along an entire river within a watershed. The detailed river slope alone is not enough to accurately simulate the locations and magnitudes of losing and gaining river reaches. Thus, local bedforms in terms of bathymetric highs and lows within the river are required. Bathymetry surveying campaigns can be more effective by prioritizing bathymetry measurements along the thalweg and gegenweg of a meandering channel. We define the gegenweg as the line that connects the shallowest points in successive cross-sections along a river opposite to the thalweg under average flow conditions. Incorporating local bedforms will likely capture the nested nature of hyporheic exchange, leading to more physically meaningful simulations of hyporheic exchange fluxes and transit times.
机译：这项研究确定了模拟水流交换时对预测偏差影响最大的河流测深方面。为了对此进行调查，我们建立了德国西南部Steinlach河试验场的高度参数化HydroGeoSphere模型作为参考。然后用更简单的测深仪修改该模型，评估流变交换通量和渡越时间分布的变化。结果表明，使用三维完全耦合模型通过高分辨率详细测深法模拟水流交换导致嵌套的多尺度水流交换系统。分辨率较差的测深法会低估小规模的交换性交换，使模拟的交换性交换偏向更大的规模，从而导致高估交换性的停留时间。当推算集水区中整个河流的所有蜿蜒曲折时，这可能会导致对流域衰减污染物能力的估计产生总体偏差。仅凭详细的河道坡度还不足以准确地模拟损失河段和增加河段的位置和大小。因此，就河流内的测深高低而言，需要当地的床形。通过优先选择沿蜿蜒通道的thalweg和gegenweg的测深仪测量，测深仪调查活动可以更有效。我们将gegenweg定义为在平均流量条件下沿着与thalweg对面的河流连续横截面上最浅点的连接线。合并局部床形将可能捕获低交换交换的嵌套性质，从而导致对低交换交换通量和传输时间更具物理意义的模拟。

著录项

  • 来源
    《Ground water》 |2019年第3期|378-391|共14页
  • 作者

    Chow Reynold; Wu Hao; Bennett Jeremy P.; Dugge Juernjakob; Woehling Thomas; Nowak Wolfgang;

  • 作者单位

    Univ Tubingen, Ctr Appl Geosci, Holderlinstr 12, D-72074 Tubingen, Germany;

    Univ Stuttgart, Inst Modelling Hydraul & Environm Syst LS3 SimTec, Stuttgart, Germany;

    Univ Tubingen, Ctr Appl Geosci, Tubingen, Germany;

    Univ Tubingen, Ctr Appl Geosci, Tubingen, Germany;

    Tech Univ Dresden, Dept Hydrol, Dresden, Germany;

    Univ Stuttgart, Inst Modelling Hydraul & Environm Syst LS3 SimTec, Stuttgart, Germany;

  • 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