近5 a来科尔沁沙地典型区域地下水埋深变化分析

 从2002至2006年奈曼旗地下水埋深监测数据中,选取典型区域的18个监测点,分为三个样带,对其地下水埋深的时空变化及其与降雨量的关系进行分析。结果表明,近5 a典型区域地下水埋深均呈下降趋势,教来河沿岸变化最为明显,年际最大水位差达2.11 m,变化幅度13.6% ~51.4%;空间分布上以教来河沿岸地下水埋深最大,近5 a平均为6.15 m;典型区域年内最高地下水位出现在3—4月,最低水位在8—9月;近5 a来降雨量和多年降雨量分别与同期地下水埋深变化的分析表明,降雨量对研究区地下水埋深影响较小。

Dynamics of Groundwater Depth in Typical Zone of Horqin Sand Land from 2002 to 2006

From the well-monitoring data of groundwater depth in period from 2002 to 2006 in the Naiman Banner, Horqin Sand Land, this paper selected the data of 18 monitoring sites which distributed at three typical belts to analyze the change of groundwater depth and its relationship with precipitation at temporal and spatial scales. The results indicated that the groundwater depth of the typical zone all increased in the five years. By the Jiaolaihe River, the groundwater depth change was larger than that of the other two belts and its annual variation of groundwater depth reached to 2.11 meters, its change range was from 13.6% to 51.4%. The spatial changes of groundwater depth showed that the groundwater depth by the Jiaolaihe River was the largest among the three belts; its average depth was 6.15 meters in these five years. The highest groundwater depth appeared in March or April, and the lowest one was in August or September in all three belts in a year. Analysis on relationship between precipitation series or the multiyear average precipitation with the groundwater depth of the corresponding period showed that precipitation had little effect on groundwater depth dynamics.