Riverbank migration and island dynamics of the braided Jamuna River of the Ganges–Brahmaputra basin using multi-temporal Landsat images

Baki, Abul Basar M.; Gan, Thian Yew

doi:10.1016/j.quaint.2012.03.016

Cited by 112 publications

(73 citation statements)

References 14 publications

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“…Hence, a single disturbance in a large braiding river could affect an entire reach, beyond the extent of individual engineering projects. The bar and branch dynamics of braided rivers have been studied by means of flume experiments (e.g., Fujita, 1989;Ashmore, 1991a), numerical modeling (e.g., Nicholas, 2013;Schuurman et al, 2013;Yang et al, 2014), and field observations (e.g., Bristow, 1987;Klaassen and Masselink, 1992;Klaassen et al, 1993;Ashworth et al, 2000;Best et al, 2003). However, in these studies, any artificial constraints and disturbances such as non-erodible (flume) walls, engineering works (Fig.…”

Section: Bar and Channel Dynamics In Braided Riversmentioning

confidence: 99%

Network response to disturbances in large sand-bed braided rivers

2016

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Abstract. The reach-scale effects of human-induced disturbances on the channel network in large braided rivers are a challenge to understand and to predict. In this study, we simulated different types of disturbances in a large braided river to get insight into the propagation of disturbances through a braided channel network. The results showed that the disturbances initiate an instability that propagates in the downstream direction by means of alteration of water and sediment division at bifurcations. These adjustments of the bifurcations change the migration and shape of bars, with a feedback to the upstream bifurcation and alteration of the approaching flow to the downstream bifurcation. This way, the morphological effect of a disturbance amplifies in the downstream direction. Thus, the interplay of bifurcation instability and asymmetrical reshaping of bars was found to be essential for propagation of the effects of a disturbance. The study also demonstrated that the large-scale bar statistics are hardly affected.

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Section: Bar and Channel Dynamics In Braided Riversmentioning

confidence: 99%

Network response to disturbances in large sand-bed braided rivers

2016

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“…The sand bodies except sediments splayed over flood plains were considered within the braided belt. The overflanking channel <100 km was also considered within the braided belt 14 . The banklines and channel lines were detected using normalized difference water index (NDWI) images.…”

Section: Methodsmentioning

confidence: 99%

“…Recent studies on river morphology have extensively used satellite remote sensing imagery 3,[12][13][14][15][16][17] . Takagi et al 18 studied the river reach of Brahmaputra in Bangladesh and concluded that the river is in dynamic equilibrium stage with its stabilization waves propagating to the downstream.…”

mentioning

confidence: 99%

Study of Channel Instability in the Braided Brahmaputra River Using Satellite Imagery

Karmaker¹,

Medhi²,

Dutta³

2017

Current Science

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In the present study, instability of the river reach of Brahmaputra was analysed for braided belt width changes, braiding index and bar area. The river reach of the Brahmaputra from its confluence of Lohit, Dibang and Dihang to its confluence with the Tista river was studied from 1973 to 2009. The study was carried out using remotely sensed data from Landsat satellites at different dates. Discharge data synchronized with satellite data was collected by maintaining near-similar water level or discharge. Wavelet of the braided belt change was analysed to get the wavelet power and spatial extent of the changes. Finally, stream power was analysed from the average discharge data during the monsoon period to determine its effect on the instability of parameters considered. Results indicate that stream power does not directly relate to local changes in the braided belt or braiding index. However, with decrease in stream power, an increasing trend of bar area was found. Maximum wavelet power within a period showed a threshold behaviour at stream power of 5 W/km, beyond which the wavelet power raised sharply to a high value with increase in stream power. River response to the stream power was found at a global level rather than local level. Finally, a gradual decrease in stream power over time indicates the stable river reach. However, changes due to local bank erosion cannot be predicted using this analysis.

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“…Lastly, from each digitally classified image a map is produced showing river channels, sandbars and a land use class that includes all cultivated and vegetated areas [18] using the available images during the dry season of 1973, 1987, 1989, 1991, 1993, 1995, 1997, 1999, 2001, 2003, 2005, 2007, 2009, 2011, 2013 & 2015. To quantify changes in river bank locations that have occurred between any two images using Arc View, a total of 80 cross-sections at 0.5 km intervals along the 51 km long study reach of the Dudhkumar River were drawn and coordinates of all intersection points between the bank lines and cross-section lines determined Figure 2. Usually, the sections used to measure the bank lines shifting are set to be at 90° to the axis of the channel [7]. However, for a channel undergoing meandering and erosion, the channel tends to change its flow direction frequently year after year, and so it will be difficult to use sections at 90° to the axis of the channel to predict the bank line shifting [7].…”

Section: Methodsmentioning

confidence: 99%

“…Baki et.al. [7] studied on river bank migration and island dynamics of braided Jamuna River using LANDSAT images. Khan et.al.…”

Section: Introductionmentioning

confidence: 99%

Analysis on River Bank Erosion-Accretion and Bar Dynamics Using Multi-Temporal Satellite Images

Rahman¹,

Yunus²

2017

AJWR

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Dudhkumar River flows from upstream of India Border at Bhurungamari to the confluence with Brahmaputra River at Noonkhawa of Kurigram district having a stretch of 64 km in Bangladesh. Due to onrush of water from upstream in monsoon, erosion in Dudhkumar River takes a serious turn, threatening collapse of Sonahat Bridge in Bhurungamari, embankment on its right bank, dykes and several dwelling houses in recent years establishing the river as a destructive one. Thus study aiming at computing the long and short term bank line shifting along the river is of great significance. In this study, images of Landsat MSS and TM acquired from the year 1973 to 2015 have been used to investigate the riverbank migration pattern, accretion-erosion, rate of change of width, sinuosity and island dynamics of Dudhkumar River. For the short term analysis, migration rates are calculated from one Landsat image to the next. For long term analysis, the migration rates are calculated based on the difference between the 1973 image as the reference and subsequent images. From the short-term analysis, the mean erosion and accretion rate have been estimated as 128 m/y and 194 m/y on the left bank, and 141 and 176 m/y on the right bank indicating the accretion rate as greater than the erosion rate. Erosion rate has been found as greater in right bank rather than left bank and accretion rate is much more in left bank than the right bank. Due to high discharge, maximum erosion and accretion have been found as 349 m/y and 410 m/y respectively at left bank in 2013-2015 indicating the bank protection measures vulnerable. Computations on sinuosity of the river Dudhkumar River show that the sinuosity ranges from 1.36 to 1.53 showing significant increase in year 1989, 1997 and 2011 due to active erosion and deposition induced by monsoon flood. Analyses on island dynamics reveal that the island area started increasing after 1973 and maximum island area found in 2001. The analysis divulged that the Dudhkumar River is a highly meandering river with several critical sections where the river has been suffering enormously with erosion problem and shifting.The present study also identifies steadfast evidence on the dynamic fluvio-geomorphology of Dudhkumar River depicting urge for execution of erosion control schemes.

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Riverbank migration and island dynamics of the braided Jamuna River of the Ganges–Brahmaputra basin using multi-temporal Landsat images

Cited by 112 publications

References 14 publications

Network response to disturbances in large sand-bed braided rivers

Network response to disturbances in large sand-bed braided rivers

Study of Channel Instability in the Braided Brahmaputra River Using Satellite Imagery

Analysis on River Bank Erosion-Accretion and Bar Dynamics Using Multi-Temporal Satellite Images

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