Observing lingering hyporheic storage using electrical resistivity: variations around stream restoration structures, Crabby Creek, PA

摘要: Time-lapse geophysical surveys can map lingering hyporheic storage by detecting changes in response to saline tracer. Tracer tests were conducted Crabby Creek, an urban stream outside Philadelphia, examine the influence of restoration structures and variable sediment thickness. We compared electrical resistivity with extensive well sampling (57 wells) two 13.5-m-long reaches, each a step drop created J-hook. The drops varied tracer behaviour, based on both data data. showed more variation arrival time where streambed was thick uniform thin. reach thin zone upstream downstream from In second thicker, contrasting results between reaches methods suggested that sediments influenced exchange than at this location. Resistivity inversion differed it evidence for after samples had returned background, mapping either or step. conclude may become important tool characterization because they provide information extent slow moving fluids zone, which have potential enhance chemical reactions. Copyright © 2012 John Wiley & Sons, Ltd.