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首页> 外文会议>International Union of Geodesy and Geophysics General Assembly >Evaluation of drought impact on groundwater recharge rate using SWAT and Hydrus models on an agricultural island in western Japan
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Evaluation of drought impact on groundwater recharge rate using SWAT and Hydrus models on an agricultural island in western Japan

机译：日本农业岛上使用SWAT和HORDUS模型对地下水充电率的评价

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Clarifying the variations of groundwater recharge response to a changing non-stationary hydrological process is important for efficiently managing groundwater resources, particularly in regions with limited precipitation that face the risk of water shortage. However, the rate of aquifer recharge is difficult to evaluate in terms of large annual-variations and frequency of flood events. In our research, we attempt to simulate related groundwater recharge processes under variable climate conditions using the SWAT Model, and validate the groundwater recharge using the Hydrus Model. The results show that annual average groundwater recharge comprised approximately 33 % of total precipitation, however, larger variation was found for groundwater recharge and surface runoff compared to evapotranspiration, which fluctuated with annual precipitation variations. The annual variation of groundwater resources is shown to be related to precipitation. In spatial variations, the upstream is the main surface water discharge area; the middle and downstream areas are the main groundwater recharge areas. Validation by the Hydrus Model shows that the estimated and simulated groundwater levels are consistent in our research area. The groundwater level shows a quick response to the groundwater recharge rate. The rainfall intensity had a great impact on the changes of the groundwater level. Consequently, it was estimated that large spatial and temporal variation of the groundwater recharge rate would be affected by precipitation uncertainty in future.
机译：澄清地下水充电对变化的非平稳水文过程的反应变化对于有效地管理地下水资源，特别是在沉淀有限的地区面临缺水风险的地区。然而，含水层充值率难以评估大量年度变化和洪水事件频率。在我们的研究中，我们试图使用SWAT模型模拟可变气候条件下的相关地下水补给过程，并使用Hydrus模型验证地下水补给。结果表明，年平均地下水补给量约占总沉淀的33％，然而，与蒸散蒸腾相比，对地下水补给和表面径流的变化较大，这波动随着年降水变化而波动。地下水资源的年度变化显示与降水有关。在空间变化中，上游是主表面排水区;中下游区域是主要的地下水充电区域。 Hydrus模型的验证表明，估计和模拟地下水水平在我们的研究领域是一致的。地下水位显示出对地下水补给率的快速反应。降雨强度对地下水位的变化产生了很大的影响。因此，据估计，地下水补给率的大量空间和时间变化将会受到未来降水不确定性的影响。

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