Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2020WR028270 |
Three-dimensional subsurface flow path controls on flow permanence | |
J. M. Dohman; S. E. Godsey; R. L. Hale | |
2021-09-08 | |
发表期刊 | Water Resources Research |
出版年 | 2021 |
英文摘要 | Intermittent streams currently constitute >50% of the global river network, and the number of intermittent streams is expected to increase due to changes in land use and climate. Surface flows are known to expand and contract within the headwater channel network due to changes in the water table driven by climate, often changing seasonally. However, the underlying causes of disconnections and reconnections throughout the stream network remain poorly understood and may reflect subsurface flow capacity. We assess how 3D subsurface flowpaths control local surface flows at Gibson Jack Creek in the Rocky Mountains, Idaho, USA. Water table dynamics, hydraulic gradients, and hyporheic exchange were monitored along a 200-m section of the stream throughout the seasonal recession in WY2018. Shallow lateral hillslope-riparian-stream connectivity was more frequent in transects spanning perennially flowing stream reaches than intermittent reaches. During low-flow periods, larger losing vertical hydraulic gradients were observed in paired piezometers in intermittent reaches than in adjacent perennial reaches. Contrary to dominant conceptual models, longitudinal measurements of hydrologic exchange in both intermittent and perennial reaches were seasonally variable except for one perennial reach that showed consistent significant gains. Observed drying dynamics, as well as subsurface pathways, were highly variable even over short distances (30 meters). Flow probability and subsurface flow capacity at upstream locations can be assessed with an outlet hydrograph and upstream flow measurements. Accurate characterization of subsurface storage, discharge, and connection is critical to understanding the drivers of drying cycles in intermittent streams and their likely responses to future change. |
领域 | 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/337614 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | J. M. Dohman,S. E. Godsey,R. L. Hale. Three-dimensional subsurface flow path controls on flow permanence[J]. Water Resources Research,2021. |
APA | J. M. Dohman,S. E. Godsey,&R. L. Hale.(2021).Three-dimensional subsurface flow path controls on flow permanence.Water Resources Research. |
MLA | J. M. Dohman,et al."Three-dimensional subsurface flow path controls on flow permanence".Water Resources Research (2021). |
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