Role of effective discharge on morphological changes for a regulated macrochannel river system

Pradhan, Chandan; Chembolu, Vinay; Dutta, Subashisa; Bharti, Rishikesh

doi:10.1016/j.geomorph.2021.107718

Cited by 20 publications

(10 citation statements)

References 52 publications

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“…Shannon’s information entropy theory is applied in this study, which is a measure of uncertainty or variability or disorder associated with the random variable 26 . Shannon 87 defined the uncertainty of occurrence of an event x i from the possible events in X as entropy H(X), which is given by here, p(x i ) is the probability of x i , which is based on the empirical frequency of X values.…”

Section: Methodsmentioning

confidence: 99%

“…The macrochannels are defined by pronounced ‘channel-in-channel’ physiography 23 , 24 and formed by hierarchical low-flows and bankfull floods 25 , 26 . Many rivers in the Southeast Asia and Australia are macrochannels and show complex arrangements of fluvial features at varying flow depths 27 .…”

Section: Introductionmentioning

confidence: 99%

“…Many rivers in the Southeast Asia and Australia are macrochannels and show complex arrangements of fluvial features at varying flow depths 27 . The previous works on macrochannel river systems are focused on the change of flow regime 24 , 27 – 30 , alteration of channel hydraulics 31 – 35 , the influence of vegetation and ecological management 36 – 40 , sensitivity and connectivity analysis 41 , 42 , and understanding the channel evolution and metamorphosis 26 , 43 – 45 . Despite the well documentation of process-form-ecological relationships, understanding the direction of morphological continuum and association-feedbacks of vegetated landforms are relatively understudied in macrochannel systems 26 , 45 .…”

Section: Introductionmentioning

confidence: 99%

“…The previous works on macrochannel river systems are focused on the change of flow regime 24 , 27 – 30 , alteration of channel hydraulics 31 – 35 , the influence of vegetation and ecological management 36 – 40 , sensitivity and connectivity analysis 41 , 42 , and understanding the channel evolution and metamorphosis 26 , 43 – 45 . Despite the well documentation of process-form-ecological relationships, understanding the direction of morphological continuum and association-feedbacks of vegetated landforms are relatively understudied in macrochannel systems 26 , 45 . In addition, instream vegetation emerges as dominating factor in controlling the direction of fluvial form in the macrochannels with reduced degrees of freedom.…”

Section: Introductionmentioning

confidence: 99%

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A process-based recovery indicator for anthropogenically disturbed river system

Pradhan

Padhee

Bharti

et al. 2022

Sci Rep

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The present paper utilizes entropy theory and Google earth engine cloud computing technique to investigate system state and river recovery potential in two large sub-basins of the Mahanadi River, India. The cross-sectional intensity entropy (CIE) is computed for the post-monsoon season (October–March) along the selected reaches. Further, a normalized river recovery indicator (NRRI) is formulated to assess the temporal changes in river health. Finally, NRRI is related to a process-based variable-LFE (low flow exceedance) to comprehend the dominating system dynamics and evolutionary adjustments. The results highlight the existence of both threshold-modulated and filter-dominated systems based on CIE and NRRI variabilities. In addition, the gradual decline in CIE and subsequent stabilization of vegetated landforms can develop an ‘event-driven’ state, where floods exceeding the low-flow channel possess a direct impact on the river recovery trajectory. Finally, this study emphasizes the presence of instream vegetation as an additional degree of freedom, which further controls the hierarchy of energy dissipation and morphological continuum in the macrochannel settings.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A process-based recovery indicator for anthropogenically disturbed river system

Pradhan

Padhee

Bharti

et al. 2022

Sci Rep

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“…This energy expenditure mechanism in the braided rivers shows the interdependence of the associated processes and channel form evolution (Pradhan, Chembolu, Dutta, & Bharti, 2021; Simon, 1992). In general, channel segmentation, bar erosion and migration are common morphological processes resulting in significant energy dissipation (Chembolu & Dutta, 2018; Dubey et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

How dynamic is the Brahmaputra? Understanding the process–form–vegetation interactions for hierarchies of energy dissipation

et al. 2022

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The spatio‐temporal heterogeneity in process–form–vegetation interactions has enabled the Brahmaputra river system to dissipate the fluvial energy at hierarchical scales. The present review article synthesizes the knowledge on braided rivers and an extensive review of the bio‐morphological processes in the Brahmaputra River. In addition, field investigated datasets along with geo‐spatial imageries and Google Earth Engine computed fluvial information are integrated to conceptualize and understand the complex underlying processes in the river. The review can be further used to propose rejuvenation frameworks and research directions concerning the implication of hierarchical energy dissipation potential in the Brahmaputra River.

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