高放废物地质处置库北山预选区地下水的形成和分布

Groundwater formation and distribution in the preselected Beishan area of repository for high level radioactive waste

本文论述北山地区不同类型地下水的形成和赋存规律。松散岩类孔隙水主要分布于沟谷和洼地,主要为潜水。沟谷潜水的形成以基岩裂隙水的侧向补给及洪流渗漏补给为主,洼地潜水可由沟谷潜水、断裂带或基岩裂隙水、古洪积扇潜水侧向补给,也可由地表洪流渗入补给;碎屑岩类孔隙裂隙水主要分布在由白垩系或第三系砂砾石构成的山间沉积盆地中,以承压水为主,洪水下渗和盆地周围基岩裂隙水的侧向径流是此类地下水的主要补给来源;基岩裂隙水主要赋存于变质岩、岩浆岩、碎屑岩、碳酸盐岩节理、裂隙中,以潜水为主。降水垂直渗入、侧向补给或洪流渗漏补给为其主要来源。

Groundwater formation and distribution in the preselected Beishan area for the geologic disposal of high level radioactive waste are presented in the paper. The pore-space water in loosening rocks mainly distributed in ravine and depression, is mainly phreatic water. The ravine groundwater is mainly recharged from lateral inflows of bedrock fracture groundwater and infiltration of flood current, and depression groundwater can be recharged from lateral inflows of ravine groundwater, fault zone or bedrock fracture groundwater, ancient pluvial fan groundwater and from infiltration of flood current. The porefracture water in clastic rocks mainly distribute in the intermountain basins which is made up of sands and gravels of Cretaceous System and Tertiary System and is mainly phreatic water. The infiltration of flood current and the lateral inflow of the bedrock fracture groundwater are the main recharge sources of this kind of groundwater. The bedrock fracture groundwater mainly distribute in the joints and fractures of metamorphic, magmatic, clastic and carbonatite rocks, is also mainly phreatic water. The infiltrations of rainfall and flood current as well as the lateral inflow are the main recharge sources of the bedrock fracture groundwater.