随着敦煌地区经济发展和人口增长，对地下水的巨量需求导致过度抽取，地下水位急剧下降，沙漠奇观月牙泉面临干涸的困境。查明敦煌月牙泉地区的水文地质条件，弄清该地区地下水的循环规律，及时保量向月牙泉补充地下水源，是一个亟待解决的问题。根据断层、导水古河道和围岩之间的物性差异，结合现有的水文地质资料，利用音频大地电磁测深法，查明了月牙泉导水构造的分布，为月牙泉地质环境治理提供可靠的基础资料。勘查结果显示月牙泉及其附近地区分布有明显的断层和导水古河道，应用音频大地电磁测深法确定断层、导水古河道的分布具有明显的地质效果，为月牙泉地下水回灌工程的开展提供科学依据。
With the economy development and population increase of Dunhuang, the pattern of water exploitation changes with each passing day. A tremendous demand for underground water results in excessive pumping, and water level falls sharply. Environments which focused on water resources become more and more maladjusted, and Crescent Spring which called as desert resort will dry up nearly. Finding out hydrogeological condition of Crescent Spring in Dunhuang and underground water circulation rules, and underground water recharging of Crescent Spring sufficiently and timely is an anxious problem to be resolved, which is important in economic merit and society significance. Based on the difference in physical property between fault, water conducted ancient riverways and their ambient rocks, an audio frequency magnetotelluric method was applied with geological data to determine distribution of water conducted structures, which provides reliable data for geological environment governance of Crescent Spring. The results obviously show that there are faults and water conducted ancient riverways in Crescent Spring and its ambient area. The conclusion can be drawn that evident geological effect can be obtained by audio frequency magnetotelluric method to define location of fault and water conducted ancient riverways and it can provide scientific foundation for underground water recharging in Crescent Spring.
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