Characterization of fracture connectivity in a siliciclastic bedrock aquifer near a public supply well (Wisconsin, USA)

摘要: In order to protect public supply wells from a wide range of contaminants, it is imperative understand physical flow and transport mechanisms in the aquifer system. Although through fractures has typically been associated with either crystalline or carbonate rocks, there growing evidence that can be an important component relatively permeable sandstone formations. The objective this work determine role serve near-surface contaminants such as wastewater leaking sewers, deep bedrock aquifer. A part Cambrian system Madison, Wisconsin (USA), was studied using combination geophysical, geochemical, hydraulic testing borehole adjacent well. Data suggest are pathways surface These fractured intervals have transmissivity values several orders magnitude higher than non-fractured intervals. With respect rapid high individual make them most likely preferential pathways. Results siliciclastic near well, may sewer-derived contaminants.