Water-table response to extreme precipitation events
Water-table response to extreme precipitation events
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DOI：
10.1016/j.jhydrol.2023.129140
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发表时间：
2023-01
影响因子：
6.4
通讯作者：
C. Corona;S. Ge;S. P. Anderson
中科院分区：
文献类型：
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作者：
C. Corona;S. Ge;S. P. Anderson
极端降水事件（EPE）将在影响全球土壤水和地下水储存方面发挥重要作用。我们研究了代表美国土壤和气候环境的 17 个案例的地下水位深度 (WTD) 对 EPE 的响应。每个案例都使用 NOAA 降水频率数据服务器的降水数据来描述 1 天极端降水事件 (EPE)，在 1981 年至 2011 年的平均基线日期范围内，年度超标概率为 0.1%。使用 HYDRUS-1D 建模软件中的反解来获得每种情况的土壤-水分保留曲线。对非 EPE 和 EPE 情景进行建模并进行比较，以检查地下水位位移 (ΔWTD) 和衰退时间 (trec)。不同情况下，ΔWTD 的范围为 0.6 至 2.4 m，并且不受 EPE 用量直接控制；相反，ΔWTD 与可用孔隙度成反比。与有效孔隙度较高的土壤相比，有效孔隙度较低的土壤经历了较大的ΔWTD。在扩散率值较大的情况下，模拟的地下水位比扩散率值较小的情况下退得更快。这是因为地下水位衰退时间trec 与水力扩散率成反比。对于所有情况，经济衰退回到 EPE 之前水平的时间从数月到数年不等，这表明非饱和带在缓冲 EPE 方面的作用有所增加，这在未来的 EPE 地下水模型研究中应予以考虑。
Extreme precipitation events (EPEs) will play a significant role in influencing soil–water and groundwater storage worldwide. We examined water-table depth (WTD) response to EPEs for 17 cases representative of soils and climate settings across the United States. Precipitation data from NOAA’s Precipitation Frequency Data Server were used for each case to characterize 1-day extreme precipitation events (EPEs) with annual exceedance probabilities of 0.1 % over an average baseline date range of 1981–2011. The inverse solution in the HYDRUS-1D modeling software was used to obtain the soil–water retention curve for each case. Non-EPE and EPE scenarios were modeled and compared to examine water-table displacement (ΔWTD) and recession time (trec). TheΔWTDranged from 0.6 to 2.4 m across cases and were not directly controlled by EPE amount; instead,ΔWTDwas inversely related to available porosity. Soils with low available porosity experienced largeΔWTDcompared to soils with higher available porosity. In cases with larger diffusivity values, the modeled water table receded faster than in cases with smaller diffusivity values. This was because water-table recession times,trec, were inversely related to hydraulic diffusivity. For all cases, recession back to pre-EPE levels ranged from months to years suggesting an increased role by the unsaturated zone in buffering EPEs that should be considered in future EPE-groundwater modeling studies.