基于MIKE SHE模型的土地利用与降水变化对宁夏中宁段黄河周边地区地下水位的影响

Impact of Changes in Land Use and Precipitation on Groundwater Level Based on MIKE SHE Model

为研究土地利用与降水变化对地下水位的影响,以黄河宁夏中宁段周边地区为研究区,建立地表水—地下水耦合的MIKE SHE分布式水文模型,并用观测井实测数据对模型参数进行率定和验证。结果表明,研究区地下水位随着降雨量的增加明显升高,并在9月份到达峰值1201.46 m;与基准组相比,对比组A年平均地下水位升高0.27 m,土地利用变化对水位升高影响作用占33.3%,降水则占66.7%;对比组B年平均地下水位升高0.51 m,土地利用变化对水位升高影响作用占35%,降水则占65%。

In order to study the impacts of land use and precipitation changes on groundwater level,a surface water-groundwater coupling MIKE SHE distributed hydrological model was established for the surrounding area of the Zhongning Section of the Yellow River in Ningxia.The model parameters were calibrated and verified by the measured data of observation wells.The results show that the groundwater level in the study area increases obviously with the increase of rainfall,and reaches the peak value of 1201.46 m in September.Compare with the benchmark group,the annual average groundwater level of the comparison group A increases by 0.27 m,of which 33.3% is attributed to the change in land use and 66.7% to that in precipitation.The annual average groundwater level of the comparison group B increases by 0.51 m,of which 35%is attributed to the change in land use and 65% to that in precipitation.