摘要
为揭示洪水作用下河岸带地下水的响应过程,利用室内物理模型试验和数值模拟,研究了不同洪峰及洪峰持续时间对地下水水位波动的影响。结果表明:河岸带地下水水位的波动具有不对称性,水位上升快下降慢,沿程地下水水位的波动呈指数形式衰减,并表现出明显的滞后性;随着洪水洪峰增大,地下水水位波动增大,河水和地下水的交换量增大,而地下水水位的滞后变化不明显;洪峰持续时间变长,地下水水位的滞后性显著,内陆地下水水位波动的幅度增大,恢复至初始状态的时间变长。
In order to study the impact of the flood process on groundwater in a riparian zone, laboratory experiments and numerical simulations were conducted to investigate the groundwater level fluctuation subjected to floods with different amplitudes and durations. The results show that the groundwater level fluctuation was asymmetric, that groundwater rose quickly and declined slowly. The amplitude of the groundwater level fluctuation attenuated with an exponential trend and a significant time lag as the distance from the bank increased. As the flood amplitude increased, the groundwater level fluctuation was enhanced, resulting in an increased amount of exchange between the river water and groundwater. However, the time lag with respect to the groundwater level changed slightly. As the duration of flood peaks increased, the time lag was significantly enhanced, the groundwater level fluctuated more significantly, and it took more time for the groundwater level to return to the pre-flood status.
出处
《水资源保护》
CAS
CSCD
2017年第2期22-30,共9页
Water Resources Protection
基金
国家自然科学基金(51579077)
关键词
河岸带
洪水
地下水水位
沙槽试验
数值模拟
riparian zone
flood
groundwater level
flume experiments
numerical simulation
