Validation of a Deterministic Hydrodynamic Model in the ICZM Framework for Gulf of Kachchh, India

Kankara, R. S.; Subramanian, B. R.; Sampath, Vanitha

doi:10.2112/04-0367.1

Cited by 7 publications

(7 citation statements)

References 4 publications

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“…Therefore, two dimensional depth averaged models were used in earlier studies in this region to simulate tides and currents, and the model results show agreement with the depth averaged observations (Moller, 1984;Unnikrishnan et al, 1999;Vethamony et al, 2004;Ramanamurthy et al, 2005;Babu et al, 2005;Kankara et al, 2007). Similarly, in the present study we used MIKE 21 -a two dimensional depth-averaged Eulerian time integration scheme -to compute current velocities by solving dynamic and vertical integrated equations of continuity and conservation of momentum (DHI Water and Environment, 2003).…”

Section: Hydrodynamic Modelmentioning

confidence: 66%

“…2). A variety of exposed and sheltered sites are present in the GoK and previous studies show the existence of three distinct eddies with diameter varying between 10 and 20 km in the western half of the GoK (Desa et al, 2002;Vethamony et al, 2004;Babu et al, 2005;Kankara , 2007). The high tidal influx covers vast low lying areas of about 1500 km 2 , comprising of creeks, marshy tidal flats and rocky regions which provide congenial environment to a wide variety of marine biota.…”

Section: Study Location and Ecologymentioning

confidence: 96%

“…Similarly, in the present study we used MIKE 21 -a two dimensional depth-averaged Eulerian time integration scheme -to compute current velocities by solving dynamic and vertical integrated equations of continuity and conservation of momentum (DHI Water and Environment, 2003). MIKE 21 has been extensively used in the simulation of hydrodynamics, water quality, wave dynamics and flow characteristics in estuaries, bays and coastal areas (Chubarenko and Tchepikova, 2001;Babu et al, 2005;Kankara et al, 2007).…”

Section: Hydrodynamic Modelmentioning

confidence: 99%

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Fish larval transport in a macro-tidal regime: Gulf of Kachchh, west coast of India

et al. 2011

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Section: Hydrodynamic Modelmentioning

confidence: 66%

Section: Study Location and Ecologymentioning

confidence: 96%

Section: Hydrodynamic Modelmentioning

confidence: 99%

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Fish larval transport in a macro-tidal regime: Gulf of Kachchh, west coast of India

et al. 2011

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“…The complex system of the Gulf is composed with fragile marine eco system where, amid the tidal channels, are small shoals and coral islands, controlling the tidal current patterns and sediment dynamics within the Gulf. From the hydrodynamic simulation of tidal currents, the contrast in mixing and transport pattern between the outer and inner Gulf was reported by Kankara et al (2007) which could be probably due to the existence of a dynamic barrier along Sikka-Mundra section, which divides the Gulf into two distinct dynamic systems as reported by Vethamony et al (2005). Babu et al (2005) studied the residual eddy currents within the Gulf using numerical modelling of tidal circulations.…”

Section: Study Area and Environmental Settingmentioning

confidence: 90%

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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“…Bathymetry data were from RDA (http://dss.ucar.edu) based at CISL Research Data Archive; datum value of MSL+1 m was selected. MIKE 21, a two-dimensional depth-averaged Eulerian time integration scheme was then utilized to compute current velocities in the model domain (DHI Water and Environment, 2001;Cox, 2003;Kankara et al, 2007;Zhao et al, 2014). A time step of 60 s was selected during the calibration and validation period (March 2010).…”

Section: Oceanographic Model Of Connectivitymentioning

confidence: 99%

Demographic Mechanisms of Reef Coral Species Winnowing from Communities under Increased Environmental Stress

et al. 2017

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Winnowing of poorly-adapted species from local communities causes shifts/declines in species richness, making ecosystems increasingly ecologically depauperate. Low diversity can be associated with marginality of environments, which is increasing as climate change impacts ecosystems globally. This paper demonstrates the demographic mechanisms (size-specific mortality, growth, fertility; and metapopulation connectivity) associated with population-level changes due to thermal stress extremes for five zooxanthellate reef-coral species. Effects vary among species, leading to predictable changes in population size and, consequently, community structure. The Persian/Arabian Gulf (PAG) is an ecologically marginal reef environment with a subset of Indo-Pacific species, plus endemics. Local heating correlates with changes in coral population dynamics and community structure. Recent population dynamics of PAG corals were quantified in two phases (medium disturbed MD 1998-2010, severely disturbed SD 1996/8, 2010 with two stable states of declining coral frequency and cover. The strongest changes in life-dynamics, as expressed by transition matrices solved for MD and SD periods were in Acropora downingi and Porites harrisoni, which showed significant partial and whole-colony mortality (termed "shrinkers"). But in Dipsastrea pallida, Platygyra daedalea, Cyphastraea microphthalma the changes to life dynamics were more subtle, with only partial tissue mortality (termed "persisters"). Metapopulation models suggested recovery predominantly in species experiencing partial rather than whole-colony mortality. Increased frequency of disturbance caused progressive reduction in coral size, cover, and population fecundity. Also, the greater the frequency of disturbance, the more larval connectivity is required to maintain the metapopulation. An oceanographic model revealed important local larval retention and connectivity primarily between adjacent populations, suggesting that correlated disturbances across populations will lead to winnowing of species due to colony, tissue, and fertility losses, with resultant insufficient dispersal potential to make up for losses-especially if disturbances increase under climate change. Variable extinction Riegl et al. Coral Winnowing in PAG Reefs thresholds exist based on the susceptibility of species to disturbance ("shrinkers" vs. "persisters"), determining which species will be winnowed from the community. Besides projected changes in coral community and population structure, no species are projected to increase in cover. Increased marginality due to climate change will lead to a net loss of coral cover and novel communities in PAG.

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Validation of a Deterministic Hydrodynamic Model in the ICZM Framework for Gulf of Kachchh, India

Cited by 7 publications

References 4 publications

Fish larval transport in a macro-tidal regime: Gulf of Kachchh, west coast of India

Fish larval transport in a macro-tidal regime: Gulf of Kachchh, west coast of India

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

Demographic Mechanisms of Reef Coral Species Winnowing from Communities under Increased Environmental Stress

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