Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2019WR026470 |
River Dynamics Control Transit Time Distributions and Biogeochemical Reactions in a Dam‐Regulated River Corridor | |
Xuehang Song; Xingyuan Chen; John M. Zachara; Jesus D. Gomez‐; Velez; Pin Shuai; Huiying Ren; Glenn E. Hammond | |
2020-08-10 | |
发表期刊 | Water Resources Research |
出版年 | 2020 |
英文摘要 | Transit time distributions (TTDs) exert important controls on biogeochemical processes in watershed systems. TTDs are often assumed to follow time‐invariant exponential, lognormal, or heavy‐tailed power‐law distributions in headwater or low‐order streams. However, under dynamic hydrological forcing, transit time could exhibit more complex distribution patterns with strong spatial and temporal variability. In this study, we used a numerical particle tracking approach to characterize TTDs along the Hanford Reach of the Columbia River under the influences of river stage fluctuations and evaluate the associated effects on biogeochemical reaction potentials within the river corridor. Particle tracking was conducted using velocity fields simulated by high‐resolution three‐dimensional groundwater flow models that capture both the river stage fluctuations and physical heterogeneity. Our results revealed that multi‐frequency flow variations led to multimodal TTDs that varied in time and space. Such characteristics can only be captured by multi‐year numerical simulations supported by multi‐year field monitoring. Dam‐induced high‐frequency (sub‐weekly) flow variations increased additional hydrologic exchange flows with short (sub‐weekly) transit times, which accounted for up to 44% of reactant consumption in the river corridor along the Hanford Reach. The dam‐induced river stage fluctuations have more significant impacts on faster biogeochemical reactions because they cause a larger fraction of shorter transit times. Numerical particle tracking provides an efficient alternative for characterizing TTDs for large complex systems where in‐situ field experiments are not feasible. Such a numerical approach is thus essential for improving large‐scale biogeochemical modeling from watersheds to basins. |
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/287830 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | Xuehang Song,Xingyuan Chen,John M. Zachara,等. River Dynamics Control Transit Time Distributions and Biogeochemical Reactions in a Dam‐Regulated River Corridor[J]. Water Resources Research,2020. |
APA | Xuehang Song.,Xingyuan Chen.,John M. Zachara.,Jesus D. Gomez‐.,Velez.,...&Glenn E. Hammond.(2020).River Dynamics Control Transit Time Distributions and Biogeochemical Reactions in a Dam‐Regulated River Corridor.Water Resources Research. |
MLA | Xuehang Song,et al."River Dynamics Control Transit Time Distributions and Biogeochemical Reactions in a Dam‐Regulated River Corridor".Water Resources Research (2020). |
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