scholarly journals Effects of Floodplain Vegetation on Flow Resistance and Velocity Distribution in Compound Channel

2012 ◽  
Vol 68 (2) ◽  
pp. I_573-I_581
Author(s):  
Fumiaki HASEGAWA ◽  
Yoshihisa KAWAHARA ◽  
Fatima JAHRA ◽  
Takuya YAMAMOTO
Keyword(s):  
Velocity Distribution ◽  
Flow Resistance ◽  
Compound Channel ◽  
Floodplain Vegetation

FLOOD HYDRAULICS DUE TO EMERGENT VEGETATION ALONG A RIPARIAN ZONE IN MEANDERING CHANNELS

2016 ◽  
Vol 78 (9-4) ◽  
Author(s):  
Zulkiflee Ibrahim ◽  
Zulhilmi Ismail ◽  
Sobri Harun ◽  
Koji Shiono ◽  
Nazirah Mohd. Zuki ◽  
...  
Keyword(s):  
Shear Stress ◽  
Flow Resistance ◽  
Riparian Zone ◽  
Streamwise Vorticity ◽  
Floodplain Vegetation ◽  
Meandering Channel ◽  
Meandering Channels ◽  
Boundary Shear ◽  
Residential Properties ◽  
Boundary Shear Stress

Frequent floods around the globe including recent events in several states in Malaysia have damaged the residential properties, infrastructures and crops or even deaths. Clearing vegetations or trees on the floodplain has been pointed out as a contributing factor to the damages. Thus, the influence of floodplain vegetation on the river hydraulics during flooding must be better understood. The hydraulics of flood flows in non-erodible vegetated meandering channel was experimented in the laboratory where two-lined steel rods were installed along a riparian zone to simulate as trees. The stage-discharge relationship, flow resistance, depth-averaged velocity, streamwise vorticity and boundary shear stress patterns during shallow and deep flood inundations were studied. The findings showed that floodplain vegetation had increased the channel flow depth by 32% and its flow resistance. The velocity in vegetated zone was lowered and the shear stress reduced by 86.5% to 91% along the river meander. In addition, the trees also limit flow interaction between main channel and floodplain

Flow Resistance in a Compound Channel with Diverging and Converging Floodplains

2018 ◽  
Vol 144 (8) ◽  
pp. 04018051 ◽  
Author(s):  
Bhabani Shankar Das ◽  
Kishanjit Kumar Khatua
Keyword(s):  
Flow Resistance ◽  
Compound Channel

G702 Prediction of Flow Resistance Based on Velocity Distribution on the Surface having Semicircular Ribs

2012 ◽  
Vol 2012 (0) ◽  
pp. 571-572
Author(s):  
Yoshitaka SANO ◽  
Masaaki MOTOZAWA ◽  
Kaoru IWAMOTO ◽  
Hideki KAWASHIMA ◽  
Hirohisa MIENO ◽  
...  
Keyword(s):  
Velocity Distribution ◽  
Flow Resistance

Depth-Averaged Velocity Distribution in a Meandering Compound Channel Using Calibrating Coefficients

2021 ◽  
pp. 229-239
Author(s):  
Anurag Handique ◽  
Arpan Pradhan ◽  
C. Sarat Chandra ◽  
Kishanjit Kumar Khatua
Keyword(s):  
Velocity Distribution ◽  
Compound Channel

scholarly journals Assessing methods for estimating roughness coefficient in a vegetated marsh area using Delft3D

2017 ◽  
Vol 19 (5) ◽  
pp. 766-783 ◽  
Author(s):  
Khalid Al-Asadi ◽  
Jennifer G. Duan
Keyword(s):  
Flow Resistance ◽  
Flow Model ◽  
Tidal Flow ◽  
Flow Dynamics ◽  
Roughness Coefficient ◽  
Flow Depth ◽  
Floodplain Vegetation ◽  
Marsh Area ◽  
Empirical Relations ◽  
Induced Flow

A Delft3D-FLOW model was used to simulate tidal flow in Davis pond marsh in Louisiana, USA. The study area is a freshwater marsh consisting of one main channel and floodplain. Vegetation-induced flow resistance greatly influences tidal flow dynamics in the marsh. This study evaluated eight approaches to estimate vegetation roughness, including two constant Manning's n values, four empirical relations for calculating n, and two methods for calculating Chezy's C values originally embedded in the Delft3D model. Simulated results of water surface elevation (WSE) were compared with the corresponding field observation at eleven stream gauges in the study area. We concluded that the roughness coefficient for vegetated area varies with time as flow depth changes. Among the selected empirical relations for the vegetation roughness, the ones accounting for the effect of the vegetation frontal area and the degree of submergence have closely matched the measurements.

On the theoretical velocity distribution and flow resistance in natural channels

2017 ◽  
Vol 555 ◽  
pp. 777-785 ◽  
Author(s):  
Tommaso Moramarco ◽  
S. Lawrence Dingman
Keyword(s):  
Velocity Distribution ◽  
Flow Resistance

Flow resistance of emergent rigid and flexible floodplain vegetation

2013 ◽  
Vol 51 (1) ◽  
pp. 33-45 ◽  
Author(s):  
Jochen Aberle ◽  
Juha Järvelä
Keyword(s):  
Flow Resistance ◽  
Floodplain Vegetation
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