Analysis of water-controlling factors and water-rich zoning of fractured bedrock aquifers in Yongshou County of Shaanxi Province

In order to systematically investigate the water-rich law of fractured bedrock aquifers in Yongshou County of Shaanxi Province, the authors in this paper combined the traditional hydrogeological survey method and statistical theory, and analyzed the water-controlling factors of fractured bedrock aquifers and water-rich zoning based on the data of 96 boreholes. The results show that the thickness of fractured bedrock aquifers has obvious spatial difference, and the thickness of sandstone fissure aquifers has greater spatial difference than that of the limestone fissure aquifers. The water-rich characteristics of bedrock fissure aquifers is mainly controlled by lithology, structure, bedrock topography and recharge and discharge, and the water storage types are mainly weathered fissure water, tectonic fissure water and diagenetic fissure water. The water-rich target areas are delineated and classified as follows: the water-rich areas of Ordovician limestone karst water in south of Laolongshan fault in the northeastern uplift of Weibei area, the water-rich areas of carbonate karst fissure near Mawoowan reservoir of Yijing fault depression zone, and water-rich areas of clastic rock fissure water near Beishunshi village of Changning Town in the heart of the loess plateau, with stable water yield above 1 000 m³/d. The research results could provide scientific decision-making basis for the construction of backup water source areas and scientific reference for the study of water abundance in similar areas.