Evaluation of drought impact on groundwater recharge rate using SWAT and Hydrus models on an agricultural island in western Japan
Evaluation of drought impact on groundwater recharge rate using SWAT and Hydrus models on an agricultural island in western Japan
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DOI：
10.5194/piahs-371-143-2015
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发表时间：
2015-06
期刊：
影响因子：
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通讯作者：
G. Jin;Y. Shimizu;S. Onodera;M. Saito;Kenji Matsumori
中科院分区：
文献类型：
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作者：
G. Jin;Y. Shimizu;S. Onodera;M. Saito;Kenji Matsumori
抽象的。弄清地下水补给对不断变化的非平稳水文过程的响应变化对于有效管理地下水资源非常重要，特别是在面临缺水风险的降雨量有限的地区。然而，由于洪水事件的年际变化大、频率高，很难对含水层的补给率进行评估。在我们的研究中，我们尝试使用SWAT模型来模拟气候变化条件下相关的地下水补给过程，并使用Hydrus模型来验证地下水补给。结果表明，年平均地下水补给量约占总降水量的33%，但地下水补给量和地表径流量的变化幅度大于蒸散量，蒸散量随年降水量的变化而波动。地下水资源的年际变化与降水有关。在空间变化上，上游是主要的地表水排泄区，中下游是主要的地下水补给区。经Hydrus模型验证表明，本研究区地下水位的估计值与模拟值吻合较好。地下水位对地下水补给率的响应速度较快。降雨强度对地下水位变化有较大影响。因此，估计未来降水不确定性将对地下水补给率产生较大的时空变化。
Abstract. 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.