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The Influence of Streambed Heterogeneity on Hyporheic Flow in Gravelly Rivers
Author(s) -
Zhou YaoQuan,
Ritzi Robert W.,
Soltanian Mohamad Reza,
Dominic David F.
Publication year - 2013
Publication title -
groundwater
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.84
H-Index - 94
eISSN - 1745-6584
pISSN - 0017-467X
DOI - 10.1111/gwat.12048
Subject(s) - hyporheic zone , geology , flux (metallurgy) , hydrology (agriculture) , flow (mathematics) , magnitude (astronomy) , hydraulic conductivity , channel (broadcasting) , sediment , streams , geomorphology , soil science , geotechnical engineering , geometry , soil water , materials science , mathematics , computer network , physics , engineering , astronomy , computer science , electrical engineering , metallurgy
Deposits of open‐framework gravel occurring in gravelly streambeds can exert a significant influence on hyporheic flow. The influence was quantified using a numerical model of the hyporheic zone. The model included open‐framework gravel stratasets represented with commonly observed characteristics including a volume fraction of about one‐third of the streambed sediment, a hydraulic conductivity two orders of magnitude greater than other strata present, and a spatial connectivity forming preferential‐flow pathways. The influence of open‐framework gravel stratasets on hyporheic flow was much greater than the influence of the channel morphology including meanders, point bars, dunes, and ripples. Seventy percent of the total hyporheic exchange occurred across 30% of the channel boundary at locations of open‐framework gravel stratasets. The maximum local interfacial flux rates occurred at these locations, and were orders of magnitude greater than those at other locations. The local flux rates varied by six orders of magnitude over the channel boundary. The composite flow rate through the model with open‐framework gravel stratsets was an order of magnitude greater than that through an equivalent but homogeneous model.