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Density‐driven exchange flow between open water and an aquatic canopy
Author(s) -
Zhang Xueyan,
Nepf Heidi M.
Publication year - 2008
Publication title -
water resources research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.863
H-Index - 217
eISSN - 1944-7973
pISSN - 0043-1397
DOI - 10.1029/2007wr006676
Subject(s) - canopy , drag , environmental science , flow (mathematics) , water flow , open water , flow velocity , volumetric flow rate , volume (thermodynamics) , hydrology (agriculture) , mechanics , atmospheric sciences , open channel flow , meteorology , soil science , geology , geotechnical engineering , marine engineering , physics , ecology , engineering , quantum mechanics , biology
Differences in water density can drive an exchange flow between the vegetated and open regions of surface water systems. A laboratory experiment has been conducted to investigate this exchange flow, using a random array of rigid, emergent cylinders to represent the canopy region. The flow pattern was captured using a CCD camera. The velocity of the current entering the canopy and the volume discharge both decrease with increasing vegetative drag and also decrease gradually over time. Theoretical predictions for velocity and discharge rate are developed and verified with experimental observations. Extensions to field conditions are also discussed.