Magnetic tracing of sediment dynamics of mudbanks off southwest coast of India

Badesab, Firoz; Gaikwad, Virsen; Gireeshkumar, T.R.; Naikgaonkar, Omkar; Deenadayalan, K.; Samiksha, Shilpi; Kumar, Pankaj; Loveson, Victor J.; Iyer, Sridhar D.; Khan, A.; Udayakrishnan, P B; Sardar, A.

doi:10.1007/s12665-018-7807-6

Cited by 5 publications

(3 citation statements)

References 61 publications

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“…By magnetically tracking the physical and sedimentary processes like entrainment, transport, sorting, settling, and enrichment of mud, associated with the formation of mudbanks, grain size-selective entrainment is the dominant process during the pre-monsoon, while during the monsoon season, wave-induced energetic bottom currents enhance the suspension of entire sediment bed load to form fluid mud [30]. In another study also the influence of wave action was observed.…”

Section: Factors Affecting Mudbank Formationmentioning

confidence: 96%

Characteristics of Mudbanks along the Southwest Coast of India

2021

EESRR

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Mudbank is a unique phenomenon observed along the south-west coast of India among all the Indian coastal regions during the Southwest Monsoon Season. The scientific reasons behind the formation and its persistence are vague. Mudbank is considered as a boon to the fishermen of Kerala, as they are getting reasonable catches during the occurrence of mudbanks using indigenous boats from the calm sea, which otherwise is in a fury during the rough Southwest Monsoon Season. Since the region, the Arabian Sea, is significant as a carbon sink due to its very high productivity because of different coastal ocean features, variations in the smaller and highly restricted coastal processes due to climate change can have a significant impact on the rates of global warming. Here, we consolidate the previous publications on various aspects of mudbanks with the reports of the occurrence of mudbanks on the south-west coast of India. A model for the prediction of the formation and location of mudbanks, inclusive of all the intrinsic and extrinsic parameters involved, through an extensive study is much relevant as far as the socio-economic and food security significance is concerned. Here, we discuss the most conducive factors for the formation of mudbank and its characteristics with special reference to Alappuzha, where the frequency of occurrence of mudbanks is maximum among the Indian coastal regions.

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Section: Factors Affecting Mudbank Formationmentioning

confidence: 96%

Characteristics of Mudbanks along the Southwest Coast of India

2021

EESRR

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“…S1). In contrast, the octahedral and subangular magnetic minerals are the typical detrital minerals with natural origins that are respectively unground and ground during transport processes (Badesab et al, 2018;Horng and Huh, 2011). In total, magnetic particles of the Daling and Luanhe rivers (Nos.…”

Section: Major Features Of Magnetic Minerals From the Xrd And Sem-edsmentioning

confidence: 99%

Magnetic fingerprints of surface sediment in the Bohai Sea, China

Zhu

Ouyang

et al. 2020

Marine Geology

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“…Despite the predominance of the economic effect from the appearance of MBs in this region, it is also necessary to take into account the dynamics of MBs when designing ports, marinas, offshore platforms, etc., in the vicinity of MBs formation regions in order to avoid, for example, possible siltation around coastal structures and changes in loads on them. Over the years, different aspects of MB have been studied by several researchers, viz., hydrography (Kurup and Varadachari, 1975;Nair, 1985), physical oceanography (Mathew et al, 1995;Jiang and Mehta, 1996;Tatavarti and Narayana, 2006;Samiksha et al, 2017;Muraleedharan et al, 2018), water quality characteristics (Rao et al, 1984;Balachandran, 2004), ecology (Nair et al, 1984;Martin Thompson, 1986), sedimentological (Ramachandran and Mallik, 1985;Mallik et al, 1988;Narayana et al, 2008), mineralogical (Nair and Murty, 1968;Rao et al, 1984), geochemical (Jacob and Qasim, 1974;Ramachandran, 1989;Badesab et al, 2018), hydrochemical (Nair and Balchand, 1992), and rheological (Faas, 1995;Jiang and Mehta, 1996;Shynu et al, 2017). Mathew et al (1995) stated that MB usually forms at 12 locations along the Kerala coast (Alleppy coastal zone) (Figure 1) during the SWM.…”

Section: Introductionmentioning

confidence: 99%

Wave Climate Variability and Occurrence of Mudbanks Along the Southwest Coast of India

2021

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Mudbanks (MBs) are a natural phenomenon, forming along the southwest coast of India during southwest monsoon (SWM), almost every year. High waves initiate these formations. The temporal variability (both intra-annual and multi-decadal) of wave climate of the southeastern Arabian Sea (AS) is related to main climate indices which determine climate fluctuations in this region, and based on that, occurrence of MBs is illustrated. Voluntary Observing Ships data and climate indices such as El Niño phenomenon index for the site 5N-5S and 170W-120W (NINO3.4), El Niño/Southern Oscillation (ENSO), Southern Oscillation Index (SOI), Pacific Decadal Oscillation (PDO), AAO, Atlantic Multi-decadal Oscillation (AMO), and IO Dipole (IOD) have been analyzed. Using wavelet correlation method, high correlations with positive and negative phase of climatic indices (IOD, SOI, NINO3.4, ENSO, AMO, PDO, and AAO) fluctuations in heights of wind waves and swell and time lags between them on monthly, yearly, decadal, and multi-decadal time scales are identified. For the first time, high correlation between the annual fluctuations of AMO and monthly average wave heights is shown. It has been found that the El Niño phenomenon plays a major role in the variability of wave climate of the southeastern AS for all time scales. A strong variability in wave climate at short time scales, such as 0.5, 1, 3.0–3.5, 4–5, and 7–8 years, is evident from the analyses. Decadal changes correspond to 10, 12–13, and 16 years. The influence of El Niño is manifested with a delay of several months (3–6) on annual time scales and about 1–2 years on a decadal and multi-decadal time scales. Possible connection between the occurrence of MBs and variability in wave climate in the southeastern AS is shown for the periods 7, 10–12, 18–20, and about 40 years correlating with fluctuation in the climate indices—IOD, ENSO, NINO3.4, and SOI. It is shown that intra-annual fluctuations in occurrence and duration of existence of MBs depend on the distribution of highest monthly averaged significant wave heights (SWHs) in the summer monsoon cycle.

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Magnetic tracing of sediment dynamics of mudbanks off southwest coast of India

Cited by 5 publications

References 61 publications

Characteristics of Mudbanks along the Southwest Coast of India

Characteristics of Mudbanks along the Southwest Coast of India

Magnetic fingerprints of surface sediment in the Bohai Sea, China

Wave Climate Variability and Occurrence of Mudbanks Along the Southwest Coast of India

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