Examining subsurface response to an extreme precipitation event using HYDRUS‐1D
Examining subsurface response to an extreme precipitation event using HYDRUS‐1D
复制标题
使用 HYDRUS™1D 检查地下对极端降水事件的响应
DOI：
10.1002/vzj2.20189
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发表时间：
2022
影响因子：
2.8
通讯作者：
Ge, Shemin
中科院分区：
文献类型：
--
作者：
Corona, Claudia R.;Ge, Shemin
2013 年 9 月，科罗拉多州中北部经历了一次极端降水事件 (EPE)，几天内降水量相当于该地区年平均降水量的 80%。 Widespread flooding occurred above ground, but the short‐ and long‐term subsurface response remains unclear.研究的目的是更好地了解地下动态响应，即地下水位和土壤储水量如何对短时间内大量入渗做出反应以及地下水文特性如何影响响应。随着未来几十年更强烈和更频繁的 EPE 的出现，对 EPE 的地下响应预计将得到更好的了解。使用 HYDRUS-1D 建立一维地下流模型，用于模拟和检查科罗拉多州博尔德溪流域某个地点 EPE 的渗透。 Model calibration was conducted with local field data to fit site observations over a 6‐yr period.在现场观测中观察到地下水位深度的快速响应，模拟的地下储存水长达 18 个月，在恢复过程中充当水力缓冲器。 To examine influence on model results, a sensitivity study of soil hydraulic parameters was conducted.敏感性研究发现，与孔径分布相关的经验参数 inn 的变化对地下水位深度的影响最为显着。其含义是，一维模型可以提供对 EPE 响应的地下水位波动和地下水力缓冲能力的有用估计，这可用于准备 EPE 对水资源影响的地区。
North‐central Colorado experienced an extreme precipitation event (EPE) in September 2013, during which the equivalent of 80% of the region's annual average precipitation fell in a few days. Widespread flooding occurred above ground, but the short‐ and long‐term subsurface response remains unclear. The objective of the study is to better understand the dynamic subsurface response, namely how the water table and soil water storage responded to a large amount of infiltration in a short period of time and how the hydrologic properties of the subsurface influence the response. Better understanding of subsurface response to EPEs is expected to increase with the advent of more intense and frequent EPEs in the coming decades. A one‐dimensional subsurface flow model using HYDRUS‐1D, was built to simulate and examine infiltration of an EPE at a site in the Boulder Creek Watershed, Colorado. Model calibration was conducted with local field data to fit site observations over a 6‐yr period. A rapid water table depth response in field observations was observed, with the modeled subsurface storing water for 18 mo acting as a hydro‐buffer during recovery. To examine influence on model results, a sensitivity study of soil hydraulic parameters was conducted. The sensitivity study found that changes inn, an empirical parameter related to pore‐size distribution, most significantly affects water table depth. The implications are that one‐dimensional models may provide useful estimates of water table fluctuations and subsurface hydro‐buffer capacities in response to EPEs, which could be of use to regions preparing for EPE effect on water resources.
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影响因子：
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