黄土高原丘陵沟壑区土地整理工程后地下水流场特征研究

Characteristics of Groundwater Flow Field after Land Consolidation Project in Hilly Gully Area of Loess Plateau

黄土丘陵沟壑区水资源环境降水和地表水资源缺乏,地下水是区域水资源利用的主体,为探讨土地整理工程对地下水特征的影响,以青海黄土沟壑区为案例,对比分析了土地整理前后地下水流场发生变化规律。结果表明,土地整理后该区地下水埋深变化趋势减弱,水源涵养能力有所增强;含水层渗流率略呈增加;水体矿化度随着时间增加呈降低至平缓型变化,水体硬度有一定改善;但土地整理后耕地面积、农药化肥施用量增加,可能导致地下水污染。

Water precipitation and surface water resources are in shortage in the LOESS hilly gully area and groundwater is the main body of regional water resources.To explore the impact of land consolidation project on groundwater characteristics,the LOESS gully area in Qinghai is taken as a case.The changes of groundwater flow field before and after land consolidation are compared and analyzed.The results show that the changes of groundwater depth in the area after land consolidation have weakened and the water conservation capacity has been enhanced.The seepage rate of the aquifer has increased slightly.With the increase of time,the degree of mineralization of water decreased to a gentle change,and the hardness of water body improved.However,the increase in the area of arable land and the application of pesticide fertilizers after the land as a whole may lead to groundwater pollution.