Open AccessEffects of channel shape on propagation characteristics of flood flows through a valley
Author(s) -
Takemura Y.,
Fukuoka S.
Publication year - 2014
Publication title -
journal of flood risk management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.049
H-Index - 36
ISSN - 1753-318X
DOI - 10.1111/jfr3.12035
Subject(s) - hydrograph , flood myth , volume (thermodynamics) , channel (broadcasting) , hydrology (agriculture) , flow (mathematics) , environmental science , geology , mechanics , geotechnical engineering , geography , physics , engineering , telecommunications , thermodynamics , archaeology
Understanding the effects of the planar, longitudinal, and cross‐sectional form (channel shape) of a river channel on the propagation of a flood flow is important for proper river improvement and management. This paper shows that the propagation characteristics of a discharge hydrograph of a flood flow are closely related to temporal changes in the mean velocity. We defined the storage volume of a flood flow produced by a decrease in the mean velocity as the ‘retarding storage volume of a flood flow’. By using observed data and unsteady two‐dimensional flow analysis of a flood of the G o R iver valley in J une 1999, the propagation mechanics of the discharge hydrograph is described in relation to the channel shape, storage volume, and retarding storage volume.