Numerical Model for Predicting Sand Bar Formation around River Mouth

2014 ◽  
Vol 26 (2) ◽  
pp. 96-102 ◽  
Author(s):  
Masamitsu Kuroiwa ◽  
Yuhei Matsubara ◽  
Yoko Suzuki ◽  
Takayuki Kuchiishi
Keyword(s):  
Numerical Model ◽  
River Mouth ◽  
Sand Bar ◽  
Bar Formation

scholarly journals APPLICABILITY OF 3D BEACH EVOLUTION MODEL WITH WAVE-CURRENT INTERACTION FOR SAND BAR FORMATION IN A RIVER MOUTH

2016 ◽  
Vol 72 (2) ◽  
pp. I_697-I_702
Author(s):  
Masamitsu KUROIWA ◽  
Ryohei ANAN ◽  
Yoko SHIBUTANI ◽  
Hajime MASE ◽  
Yuhei MATSUBARA
Keyword(s):  
River Mouth ◽  
Evolution Model ◽  
Current Interaction ◽  
Sand Bar ◽  
Bar Formation

scholarly journals THE EFFECT OF THE INITIAL BED PERTURBTION TO THE SAND BAR FORMATION AND EVOLUTION PROCESS

2007 ◽  
Vol 51 ◽  
pp. 1045-1050
Author(s):  
Kensuke KOBAYASHI ◽  
Yasuyuki SHIMIZU ◽  
Sanjay GIRI ◽  
Yasuharu WATANABE
Keyword(s):  
Evolution Process ◽  
Formation And Evolution ◽  
Sand Bar ◽  
Bar Formation

MORPHOLOGICAL CHANGES OF THE RIVER MOUTH SAND BAR AT THE KUMANO RIVER

2021 ◽  
Vol 77 (2) ◽  
pp. I_523-I_528
Author(s):  
Junya YAMAMOTO ◽  
Makoto NAKAMICHI ◽  
Masaaki HASHIMOTO ◽  
Jun KANETO ◽  
Tomokazu HIROSAWA ◽  
...  
Keyword(s):  
Morphological Changes ◽  
River Mouth ◽  
Sand Bar

scholarly journals Numerical simulation of bedload tracer transport associated with sand bar formation, bank erosion, and channel migration

2018 ◽  
Vol 40 ◽  
pp. 02013
Author(s):  
Toshiki Iwasaki ◽  
Satomi Yamaguchi ◽  
Hiroki Yabe
Keyword(s):  
Numerical Model ◽  
Bank Erosion ◽  
Bedload Transport ◽  
Transport Processes ◽  
Tracer Transport ◽  
Channel Migration ◽  
River Systems ◽  
Sand Bars ◽  
Tracer Particles ◽  
Bar Formation

An understanding of bedload transport processes is an essential research goal for better prediction of river morphology and morphodynamics as well as the transport and fate of sediment-bound materials in river systems. Passive tracer particles have been used widely to monitor bedload transport processes in rivers by measuring the spatiotemporal distribution of the bedload tracers. Here, we propose a numerical model for reproducing the transport of bedload tracers in river systems, more specifically, the behaviours of bedload tracers under the influence of complex river morphodynamics. A two-dimensional morphodynamic model is combined with a flux-based bedload tracer model with use of the active layer approach. The model is applied to a laboratory experiment that demonstrates the transport processes within the channel of bedload tracers supplied from the floodplain. The numerical model effectively reproduces the main features of the experiment, namely, the bedload tracers supplied from the floodplain due to bank erosion deposit onto sand bars developed within the channel. Because the sand bars cause a very long residence time of the bedload tracers within the bed, the transport speed of the tracers is slowed significantly under the influence of bar formation and channel migration.

scholarly journals Morphological Changes of the Lower Ping and Chao Phraya Rivers, North and Central Thailand: Flood and Coastal Equilibrium Analyses

2019 ◽  
Vol 11 (1) ◽  
pp. 152-171 ◽  
Author(s):  
Nikhom Chaiwongsaen ◽  
Parisa Nimnate ◽  
Montri Choowong
Keyword(s):  
Morphological Changes ◽  
River Mouth ◽  
Sediment Supply ◽  
Gulf Of Thailand ◽  
River Bank ◽  
Water Storage Capacity ◽  
Rainfall Condition ◽  
Sand Bar ◽  
Geomorphological Changes ◽  
Chao Phraya River

Abstract The Chao Phraya River flows in the largest river basin of Thailand and represents one of the important agricultural and industrial areas in Southeast Asia. The Ping River is one major upstream branch flowing down slope southwardly, joining the Chao Phraya River in the low-lying central plain and ending its course at the Gulf of Thailand. Surprisingly, the overflow occurs frequently and rapidly at the Lower Ping River where channel slope is high, and in particular area, sand-choked is extensively observed, even in normal rainfall condition. In contrary, at the downstream part, the erosion of river bank and shoreline around the mouth of Chao Phraya River has been spatially increasing in place where there should be a massive sediment supply to form a delta. Here we use Landsat imageries taken in 1987, 1997, 2007 and 2017 to analyze geomorphological changes of rivers. Results show that both rivers have undergone the rapid decreasing of water storage capacity and increasing of sand bar areas in river embayment. The total emerged sand bar area in the Lower Ping River increases from 1987 to 2017 up to 28.8 km2. The excessive trapped bed sediments deposition along the upper reaches is responsible for the shallower of river embankment leading to rapid overflow during flooding. At the Chao Phraya River mouth, a total of 18.8 km2 of the coastal area has been eroded from 1987 to 2017.This is caused by the reducing of sediment supply leading to non-equilibrium in the deltaic zone of the upper Gulf of Thailand. There are several possibility implications from this study involving construction of weir, in-channel sand mining, reservoir sedimentation and coastal erosion management.

scholarly journals FIELD AND NUMERICAL STUDIES FOR FROMATION OF SAND BAR AT THE YURA RIVER MOUTH

2015 ◽  
Vol 71 (4) ◽  
pp. I_709-I_714
Author(s):  
Fuminori NAKAMURA ◽  
Misato ASAKURA ◽  
Keiichi KANDA ◽  
Hiroshi MIWA ◽  
Tokuzou HOSOYAMADA
Keyword(s):  
River Mouth ◽  
Numerical Studies ◽  
Sand Bar

scholarly journals Prediction of shoreline change using a numerical model: case of the Kulon Progo Coast, Central Java

2019 ◽  
Vol 270 ◽  
pp. 04023
Author(s):  
Asrini Chrysanti ◽  
Mohammad Bagus Adityawan ◽  
Widyaningtyas ◽  
Bagus Pramono Yakti ◽  
Joko Nugroho ◽  
...  
Keyword(s):  
Numerical Model ◽  
Coastal Area ◽  
Satellite Image ◽  
River Mouth ◽  
Shoreline Change ◽  
Development Project ◽  
Model Case ◽  
Shoreline Changes ◽  
Central Java ◽  
Coastal Process

Kulon Progo Airport is an airport development project located in the coastal area near Yogyakarta, Indonesia, which is expected to complete in 2019. With the increase in population, huge land acquisition will be difficult, so the development of coastal areas for the airport became inevitable. Kulon Progo is located in the disaster-prone zone area of the earthquake and tsunami, the airport design must consider the risk management and mitigation from tsunami and earthquake disaster. Although the airport is already calculated the danger of earthquake and tsunami, the development of the coastal area also needs to consider the danger of the natural coastal process itself such as sedimentation and erosion. Shoreline changes due to the new infrastructure in the coastal area can disrupt the equilibrium of coastal process especially the longshore sediment transport. A satellite image shows that Kulon Progo shoreline retreats over 60 meters due to the heavy sediment longshore transport in the past 10 years. Breakwaters in Tanjung Adikarto fishing port also made a great contribution in huge sedimentation behind the infrastructure up to 90 meters. This research will conduct an analysis trough satellite and numerical model to observe the shoreline changes along Kulon Progo Coast. A numerical model shows a high erosion rate along the coast. High sedimentation also observed at the river mouth of Bogowonto and Serang Rivers.

scholarly journals NUMERICAL MODEL OF BREAKING WAVE AROUND A RIVER MOUTH

1986 ◽  
Vol 1 (20) ◽  
pp. 97
Author(s):  
Jong-Sup Lee ◽  
Toru Sawaragi ◽  
Ichiro Deguchi
Keyword(s):  
Numerical Model ◽  
Wave Breaking ◽  
Small Amplitude ◽  
River Mouth ◽  
Wave Theory ◽  
Experimental Result ◽  
Breaking Wave ◽  
Linear Wave ◽  
Amplitude Wave ◽  
Current Interaction

Equations for wave kinematics and wave dynamics based on small amplitude wave theory have been used in the prediction of wave deformations and wave-indused currents. However, the applicability of the linear wave theory is questionable in a river mouth where forced wave breaking and strong wave-current interaction take place. A numerical model based on the non-linear dispersive wave theory has been developed, the results by this model was compared with the values of the experiments and the linear theory. Wave transformations including shoaling, wave-current interaction and wave breaking by the model showed a good agreement with the experimental result. In the prediction of wave-induced currents, the excess momentum flux (Pxx) computed by the model has more reasonable value than the radiation stress ( Sxx) calculated by the small amplitude wave theory.

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