Influence of the macrotidal environment on the source to sink pathways of suspended flux in the Gulf of Kachchh, India: evidence from the Ocean Colour Monitor (IRS‐P4)

Chauhan, O.S.; Menezes, Andrew; Jayakumar, S.; Malik, Manzoor Ahmad; Pradhan, Yaswant; Rajawat, A. S.; Nayak, Shailesh; Bandekar, G.; Almeida, Cicero Lima de; Talaulikar, Madhubala; Ramanamurty, M.V.; Subramanian, B. R.

doi:10.1080/01431160600962756

Cited by 7 publications

(7 citation statements)

References 12 publications

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“…(Figure 1A and B) marks the northernmost limit of reef development on the continental shelf of India [13]. Gulf of Kachchh is a funnel-shaped, east-west-oriented, seismically active indentation between the Kachchh mainland and Saurashtra/Kathiawar peninsula of Gujarat state in India [14]. This gulf occupies an area of 7350 km 2 with an average depth of 30 m [15].…”

Section: Study Area: Bet Shankhodhar Reefmentioning

confidence: 99%

“…This gulf occupies an area of 7350 km 2 with an average depth of 30 m [15]. Gulf of Kachchh represents a high-energy, semi-diurnal, macro-tidal environment with varying tidal amplitude of 4 m at its mouth to 7 m in the inner gulf [14]. The southern shore of the gulf is relatively smooth and has an assemblage of ecologically sensitive ecosystems including coral reefs, seagrass beds, seaweeds, mangroves and tidal flats [15].…”

Section: Study Area: Bet Shankhodhar Reefmentioning

confidence: 99%

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Macroalgae Species as Zonal Indicators of Coral Reef: A Case Study from Bet Shankhodhar Reef, India

Chaudhury¹,

Sanghvi²,

Jain³

2019

Wetlands Management - Assessing Risk and Sustainable Solutions

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Tropical coral reefs are major habitats for marine macroalgae or seaweeds. Macroalgae represent a key functional group among the coral reef communities and perform vital ecological functions like reef structure stabilisation, production of tropical sands, nutrient retention and recycling, primary productivity and trophic support. Coral reef macroalgae are comprised of three major pigment-group-based phyla: Chlorophyta (green algae), Heterokontophyta or Ochrophyta (brown algae) and Rhodophyta (red algae). Green macroalgae or Chlorophyta contain chlorophyll a and b pigments in the same proportion as that of higher plants along with β-carotene and xanthophylls and have significant industrial or commercial value. Chlorophyta members commonly inhabit the littoral zone with strong sunlight. This chapter highlights micro-level habitat preference of green macroalgae or Chlorophyta species sampled from Bet Shankhodhar Reef from the Gujarat coast of India as a unique case study. This study identifies four Chlorophyta species: Halimeda tuna (Ellis & Solander) Lamouroux, Caulerpa sertularioides (S. Gmelin) Howe f. brevipes (J. Agardh) Svedelius, Valonia aegagropila C. Agardh and Valoniopsis pachynema (Martens) Børgesen, as indicator species of the backreef zone. Shallow tidal pools in the backreef zone of Bet Shankhodhar Reef are preferred microhabitats for C. sertularioides and V. aegagropila.

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Section: Study Area: Bet Shankhodhar Reefmentioning

confidence: 99%

Section: Study Area: Bet Shankhodhar Reefmentioning

confidence: 99%

Macroalgae Species as Zonal Indicators of Coral Reef: A Case Study from Bet Shankhodhar Reef, India

Chaudhury¹,

Sanghvi²,

Jain³

2019

Wetlands Management - Assessing Risk and Sustainable Solutions

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“…Babu et al (2005) studied the residual eddy currents within the Gulf using numerical modelling of tidal circulations. Hydrodynamic simulation studies alone were found to be ineffective in understanding various sediment dynamics and the use of satellite data in conjunction with the numerical results were opted by Kunte et al (2005) and Chauhan et al (2006Chauhan et al ( , 2007 to comprehend the sediment distribution and source to sink pathways of sediment fluxes. Babu et al (2003) have studied the sediment transport along Mangalore coast in the Arabian Sea using model results.…”

Section: Study Area and Environmental Settingmentioning

confidence: 99%

Simulation of suspended sediment transport initialized with satellite derived suspended sediment concentrations

Ramakrishnan

Rajawat

2012

J Earth Syst Sci

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Suspended sediment transport in the Gulf of Kachchh is simulated utilizing the suspended sediment concentration (SSC) derived from Oceansat OCM imagery, as the initial condition in MIKE-21 Mud Transport model. Optimization of the model mud parameters, like settling velocity and critical shear stress for erosion are realized with respect to the sediment size distribution and the bottom bed materials observed in the Gulf. Simulated SSCs are compared with alternate OCM derived SSC. The results are observed to be impetus where the model is able to generate the spatial dynamics of the sediment concentrations. Sediment dynamics like deposition, erosion and dispersion are explained with the simulated tidal currents and OCM derived sediment concentrations. Tidal range is observed as the important physical factor controlling the deposition and resuspension of sediments within the Gulf. From the simulation studies; maximum residual current velocities, tidal fronts and high turbulent zones are found to characterise the islands and shoals within the Gulf, which results in high sediment concentrations in those regions. Remarkable variability in the bathymetry of the Gulf, different bed materials and varying tidal conditions induces several circulation patterns and turbulence creating the unique suspended sediment concentration pattern in the Gulf.

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“…OCM-derived SSC products can also be input to simulate and predict SSC in the GK [Ramakrishnan and Rajawat, 2012]. Chauhan et al [2007] used the improved spatial resolution of OCM data to find sources, sinks, and dispersal pathways of suspended sediments in the GK. It is possible to retrieve SSC from satellite-detected water-leaving radiance in the electromagnetic channels, which are sensitive to reflection/absorption from suspended sediments.…”

Section: Introductionmentioning

confidence: 99%

Modeling and remote sensing of suspended sediments in the Gulf of Kachchh, India

Gupta

2015

European Journal of Remote Sensing

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This paper presents a comprehensive analysis of OCEANSAT-1 OCM (Ocean Color Monitor)-derived suspended sediment concentration (SSC), MIKE 21-simulated SSC, bathymetry, and tidal current speed and direction using tidal harmonic analysis to study the suspended sediments in the Gulf of Kachchh in the Arabian Sea for tidal and monsoonal changes. The spring tide and bathymetry predominantly control the sediment dynamics at Okha and Navlakhi ports as shown by the time series data. The sequential high temporal resolution of OCM-derived SSC images is near-ideal means for monitoring the Gulf. The abrupt OCM-derived SSC values were due to the combined influence of deficient monsoon in 2004, prevailing winds, and the re-suspension of bottom sediments.

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Influence of the macrotidal environment on the source to sink pathways of suspended flux in the Gulf of Kachchh, India: evidence from the Ocean Colour Monitor (IRS‐P4)

Cited by 7 publications

References 12 publications

Macroalgae Species as Zonal Indicators of Coral Reef: A Case Study from Bet Shankhodhar Reef, India

Macroalgae Species as Zonal Indicators of Coral Reef: A Case Study from Bet Shankhodhar Reef, India

Simulation of suspended sediment transport initialized with satellite derived suspended sediment concentrations

Modeling and remote sensing of suspended sediments in the Gulf of Kachchh, India

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