A Conceptual Model for Erosion Processes of High River Bank

Fujita, Yuya; Kawaguchi, Masamitsu; Pham, Thanh Hai

doi:10.2208/prohe.44.753

Cited by 6 publications

(4 citation statements)

References 5 publications

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“…Various natural processes and its responses are accountable for river bank erosion, transportation and deposition (Charlton, 2007; Wohl, 2020) but sometimes human activities (Chamling et al, 2022; Gregory, 2006) (through land use and land cover modification) provoke the frequency and magnitude of riverbank erosion mostly at the alluvial floodplain region. Primarily river bank erosion is a combination of geomorphological and hydrological processes (Rosgen, 2001) whereas widespread detachment of non‐cohesive materials within the bank occurs through hydraulic action at the stage of liquefaction (Bera et al, 2019; Dharamdial & Khanbilvardi, 1988; Fujita et al, 2000; Hooke, 1979). Basically, the rate of sediment yield and sediment connectivity to the channel with flood plain encourages the mechanism of river bank erosion (Fujita et al, 2000; Rosgen & Silvey, 1996).…”

Section: Introductionmentioning

confidence: 99%

“…Primarily river bank erosion is a combination of geomorphological and hydrological processes (Rosgen, 2001) whereas widespread detachment of non‐cohesive materials within the bank occurs through hydraulic action at the stage of liquefaction (Bera et al, 2019; Dharamdial & Khanbilvardi, 1988; Fujita et al, 2000; Hooke, 1979). Basically, the rate of sediment yield and sediment connectivity to the channel with flood plain encourages the mechanism of river bank erosion (Fujita et al, 2000; Rosgen & Silvey, 1996). Processes of river bank erosion are generally regulated by different external and internal factors (Bera et al, 2019; Hughes, 2016) and repeated bank failure also assists channel planform adjustment and partial stability of river bank (Bera et al, 2019; Khan et al, 2022; Wellmeyer et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

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Around seven decades river course shifting and bank erosion susceptibility of river Mujnai

Sarkar

Bera

2022

River

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River bank erosion is a destructive fluvio-hydrological hazard particularly inhabited flood plain of the dynamic Himalayan foreland basin. Every year during monsoonal months, morphology of the landscape is continuously modifying through the dynamic river system. The principal objectives of this study are (i) to identify the river bank erosion susceptibility through BESI (River Bank Susceptibility Index) model which has been modified from Rosgen's (2001) Bank Erosion Hazard Index (BEHI) model and historical reconstruction (from 1955 to 2021) of the river course of Mujnai and (ii) to examine the principal factors of river bank erosion particularly for the river Mujnai within Himalayan Foreland Basin. Sedimentary bank facies analysis has also been done to ascertain the causes of river bank instability. Hence, rate of bank migration, changes of channel width, channel sinuosity index (SI), channel length, erosion and accretion of the river bank, and so forth have been measured through geospatial techniques. Result showed that the younger Quaternary sediments are prone to erosion and BESI result illustrated that around 28% areas are under high erosion zones like Deoagaon, Dhulagaon, Hedayet Nagar, and Dalimpur villages in Alipurduar district. Average maximum width of the channel was recorded in 1980 (147.92 m). Additionally, the lateral migration in case of left bank was around 141.08 m (in the 1980) and 192.62 m in right bank (in 1980) while the shifting rate was 14.10 m/y and 17.51 m/y respectively. Quaternary bank materials, bioturbation and indistinct laminations of river bank are principal regulating factors behind bank erosion in this area. Monsoonal high-velocity flow, bank full discharge and severe flood incidents accelerate the bank erosion vulnerability, particularly in this dynamic flood plain. Soft engineering techniques such as bioengineering, geotextile fabric, tree, grass and brush revetment should be implemented at high bank erosion vulnerable sites of river Mujnai.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Around seven decades river course shifting and bank erosion susceptibility of river Mujnai

Sarkar

Bera

2022

River

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“…Erosion of riverbank and shifting of river channel create many problems for Bangladesh in both socio-economic and environmental sectors (Klaassen et al 2002). Riverbank erosion means the fragmentation or transferring away the sediments of the riverbank by itself which causes river channel bend (Fujita et al 2000). In recent years, a number of researchers have investigated riverbank erosion and river channel shifting.…”

Section: Introductionmentioning

confidence: 99%

Trend Analysis and Simulation of Human Vulnerability Based on Physical Factors of Riverbank Erosion Using RS and GIS

et al. 2021

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This study aims to analyze the pattern of bank erosion and simulate the physical aspects of vulnerability in the lower Meghna River, Bangladesh using remote sensing (RS) and geographic information systems (GIS). The physical factors of vulnerability were analyzed using GIS-based Structured Query Language (SQL). A questionnaire survey, GPS survey and field observation survey were conducted for collecting the primary data in the study area. The secondary data were mainly satellite image collected from the United States Geological Survey (USGS) website. Using time series Landsat images (MSS, TM and OLI-TIRS), this study analyzed 36 years of erosion and accretion process in the Mehendiganj Upazila region from 1980 to 2016. The result indicates that an enormous amount of land (4470.47 ha) was submerged by the river and average land loss rate was 124.18 ha/year. The study quantifies the number of vulnerable households beneath the present condition and how much it will be altered after a positive/negative change with the factors of vulnerability related to the households. Simulation data reveals that under the present physical condition, 43.88% of households were identified as severely vulnerable. The output of this study can be used in the classification of vulnerable households and for the improvement of the physical infrastructure development process near the erosion prone areas, also helps to mitigate environmental disaster in the developing countries.

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“…al. 6) presented a conceptual model for erosion processes for high riverbanks. They analyzed the movement of failed soil mass by the simplified Junbu method and the Newton's second law of motion.…”

Section: Introductionmentioning

confidence: 99%

Failure Process of Bank Material Block in Weak Cohesive Riverbanks

El-Dien

Ahmed²,

Takebayashi

et al. 2017

JJSCE B1

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A new approach to simulate the mass failure process in riverbanks is developed and verified by experimental work. Both planer and circular failure modes can be expressed by this approach. The proposed approach is capable of distributing the collapsed bank material. Failure mechanism of riverbanks is described, failure plane is determined, shape of collapsed material is proposed, and travel slide distance is estimated. Eight experimental cases were conducted to investigate the processes of mass failure that follows the hydraulic erosion of an artificial riverbank with different heights and slopes. Deformations, developed cracks, plane of failure, and shape of deposited material were recorded. It is watched from experimental results that there exist many cracks are developed and thus many planes of failure are found, while in numerical simulation only one failure plane exists. The difference between simulated and experimental results may return to the large deformation of collapsed bank material which can't be simulated by simplified assumptions. Further improvements to the proposed approach are needed.

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A Conceptual Model for Erosion Processes of High River Bank

Cited by 6 publications

References 5 publications

Around seven decades river course shifting and bank erosion susceptibility of river Mujnai

Around seven decades river course shifting and bank erosion susceptibility of river Mujnai

Trend Analysis and Simulation of Human Vulnerability Based on Physical Factors of Riverbank Erosion Using RS and GIS

Failure Process of Bank Material Block in Weak Cohesive Riverbanks

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