Responses of soil water percolation to dynamic interactions among rainfall, antecedent moisture and season in a forest site
Responses of soil water percolation to dynamic interactions among rainfall, antecedent moisture and season in a forest site
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DOI：
10.1016/j.jhydrol.2016.06.038
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发表时间：
2016-09
影响因子：
6.4
通讯作者：
X. Lai;K. Liao;Huihui Feng;Q. Zhu
中科院分区：
文献类型：
--
作者：
X. Lai;K. Liao;Huihui Feng;Q. Zhu
了解根区以下土壤水渗流及其对不同因素动态相互作用的响应对于控制面源污染具有重要意义。本研究基于Hydrus-1D模拟的3600个情景，揭示了中国太湖流域某森林点的降雨特征（降雨量、最大降雨强度或MRI、降雨时间分布特征或TDC）、前期湿度和季节对深层渗滤（DP）的综合影响。结果表明，Hydrus-1D模型能够很好地模拟该场地的土壤水动态。前期湿度对DP的相对贡献最大（85.7%），其次是降雨量（10.9%）和MRI（3.4%）。随着前期湿度的增加，季节对DP的相对贡献从0.0%增加到16.4%。相比之下，MRI的降水量从58.7%下降到38.5%，降水量呈钟形变化（前期湿度为0.26 m3 m±3时最大）。夏季前期水分对DP的相对贡献最大（87.8%），降雨的相对贡献最小。 TDC 通过影响 DP 对其他因素的响应来影响 DP。当降雨量为P80mm，前期含水量为P0时。 34 m3 m±3，可以观察到TDC对DP的影响。 TDC_B（降雨强度随时间线性增加）的DP最低，TDC_E（降雨强度随时间保持恒定）的DP最大。本研究结果对于研究包气带水和污染物的运移具有实际意义。 Ó 2016 Elsevier BV 保留所有权利。
Knowledge of soil water percolation below the rooting zone and its responses to the dynamic interactions of different factors are important for the control of non-point source pollution. Based on 3600 scenarios in Hydrus-1D simulation, this study revealed the integrated effects of rainfall characteristics (rainfall amount, maximum rainfall intensity or MRI, time distribution characteristics of rainfall or TDC), antecedent moisture and the season on deep percolation (DP) at a forest site in Taihu Lake Basin, China. Results showed that Hydrus-1D model can well simulate the soil water dynamics at this site. Antecedent moisture had the greatest relative contribution to DP (85.7%), followed by rainfall amount (10.9%) and MRI (3.4%). As the antecedent moisture increased, the relative contribution of the season on DP increased from 0.0% to 16.4%. In comparison, that of MRI decreased from 58.7% to 38.5% and that of rainfall amount followed a bell shape pattern (greatest when the antecedent moisture was 0.26 m3 mÀ3). The relative contribution of antecedent moisture to DP in summer was the greatest (87.8%), while that of the rainfall was the least. The TDC influenced DP by affecting the responses of DP to other factors. When the rainfall amount was P80 mm and the antecedent moisture content was P0. 34 m3 mÀ3, effect of TDC on DP could be observed. The DP of TDC_B (rainfall intensity linearly increased with time) was the lowest, while that of TDC_E (rainfall intensity kept constant with time) was the greatest. Findings of this study have practical significance for investigating the water and pollutant transport in vadose zone. Ó 2016 Elsevier BV All rights reserved.