基于标准地下水指数的地下水位动态及其对降水变化的响应

Groundwater Level Dynamics and Its Response to Variations of Precipitation Based on Standardized Groundwater Index

为科学探索地下水位变化规律,研究地下水位对降水变化的响应机理,通过计算2001—2013年期间1~48个月时间尺度的标准化降水指数(SPI)与标准化地下水指数(SGI),统计分析SPI与SGI变化规律和相关关系,研究了地下水位埋深对降水变化的时空响应规律,进而寻求地下水位对降水最佳响应时间。结果表明:2001—2013年期间SPI呈波动变化,干旱期和湿润期持续时间随着计算SPI时间尺度的增加而延长,间隔变化频率随计算时间尺度增加而降低;地下水位对降水最佳响应时间出现的时间尺度为36~48个月。因此可见,SGI是研究地下水动态及其对降水变化响应较为有效的工具。

To scientifically explore the law of groundwater level change,the response mechanism of groundwater level to precipitation changes was studied.Through calculating the standardized precipitation index(SPI)and standardized groundwater index(SGI)from 1 to 48 months of the period from 2001 to 2013,the change law and correlation of SPI and SGI were statistically analyzed.Meanwhile,the time-space response law of groundwater level burial depth to precipitation change was studied,and the optimal response time of groundwater level to precipitation was identified.The results show that the SPI fluctuates during the period from 2001 to 2013.The duration of the dry period and humid period are extended with the increase of the SPI time scale.The interval change frequency decreases with the increase of the calculation time scale.The time scale of the optimal response time of the groundwater level to precipitation is 36~48 months.In summary,SGI is a tool to study groundwater dynamics and its response to precipitation changes.