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Modelling flow resistance in vegetated streams: review and development of new theory
Author(s) -
Green Julian C.
Publication year - 2004
Publication title -
hydrological processes
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.222
H-Index - 161
eISSN - 1099-1085
pISSN - 0885-6087
DOI - 10.1002/hyp.5564
Subject(s) - flow resistance , resistance (ecology) , streams , vegetation (pathology) , flow (mathematics) , channel (broadcasting) , macrophyte , hydraulic resistance , current (fluid) , environmental science , hydrology (agriculture) , flow conditions , open channel flow , function (biology) , geology , ecology , computer science , mathematics , mechanics , geotechnical engineering , geometry , biology , physics , telecommunications , medicine , computer network , oceanography , pathology , evolutionary biology
Aquatic macrophytes are often the dominant factor influencing flow conditions within the channels they occupy. Existing knowledge of how stream plants affect the flow is outlined, and the different scales at which vegetation resistance operates are proposed. Resistance is shown to be a function of the size of the plants, their structural properties, location in the channel, and the local flow conditions. Current models to calculate this composite resistance effect are assessed in the light of theoretical considerations of the nature of vegetation resistance. New theory is also presented, which demonstrates the non‐linear relationship between channel resistance and the proportion of the channel occupied by vegetation. Copyright © 2004 John Wiley & Sons, Ltd.