Sediment distribution study in the Gulf of Kachchh, India, from 3D hydrodynamic model simulation and satellite data

Kunte, P.D.; Zhao, Chunjiang; Osawa, Takahiro; Sugimori, Yasuhiro

doi:10.1016/j.jmarsys.2004.09.008

Cited by 15 publications

(10 citation statements)

References 9 publications

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“…and 3D modeling results of other studies (Kunte et al, 2005, Vethamony et al, 2005. However, the magnitude of the currents derived from the models was found to be underestimated.…”

Section: Methodsmentioning

confidence: 68%

Anomalous inland influx of the River Indus, Gulf of Kachchh, India

et al. 2006

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The Gulf of Kachchh is a funnel shaped, macrotidal water body located in the arid region of northwestern India with ~ 50 cm annual rainfall and insignificant fluvial input. The Gulf waters, however, have high-suspended matter. Time series measurements of total suspended matter (TSM) and synchronous, validated hydrodynamic modeling have been used to decipher the dispersal pathways and the sources of the high turbidity. Contrary to the prevalent offshore reducing trend for most of the Indian Coast, the Gulf is anomalous for having an enhanced turbidity at the mouth with lower concentrations in the inland areas. The hydrography of the Gulf is dominated by strong, alongshore currents at the mouth which move in (out) during flood (ebb), and undergo cyclic, dynamic changes with tidal phases. The flood tidal currents amplify inland with propagating tides, pulling in the offshore waters and acting as a feeder of high saline, turbid offshore waters into the Gulf, most of which are trapped inland due to time lag of ebb and flood between the outer and the inner Gulf. Based upon the distribution maps of TSM and clays in the water column, it is deduced that a large segment of the Gulf is nourished by contributions from the Indus River.

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“…and 3D modeling results of other studies (Kunte et al, 2005, Vethamony et al, 2005. However, the magnitude of the currents derived from the models was found to be underestimated.…”

Section: Methodsmentioning

confidence: 68%

Anomalous inland influx of the River Indus, Gulf of Kachchh, India

et al. 2006

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“…In literature, these types of sand deposits have been defined as estuarine “sandbars” [e.g., Chien et al ., ]. In order to avoid any misunderstanding of the term “sandbar,” in the present contribution, such features will be referred to as “inside bars.” As far as the inside bar is concerned, the processes of river‐tide interaction and its influences on the sand body are only poorly understood, although a number of observations have been made [e.g., Chien et al ., ; Harris , ; Dalrymple et al ., ; Kunte et al ., ; Yu et al ., ]. Thus, a detailed study on the inside bar will be beneficial to the enhancement of our ability to predict the future dynamics of estuarine morphodynamics resulting from natural and/or human activity factors or to interpret the deposits formed in the past.…”

Section: Introductionmentioning

confidence: 99%

Morphodynamic modeling of a large inside sandbar and its dextral morphology in a convergent estuary: Qiantang Estuary, China

et al. 2017

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We investigate the evolution of a large‐scale sand body, a unique type of sandbars in a convergent estuary. Specifically, we analyze and simulate the sand deposition system (defined as an inside bar) in the Qiantang Estuary (QE) in China. The deposit is 130 km long and up to 10 m thick and is characterized by a dextral morphology in the lower QE. Numerical simulation is carried out using an idealized horizontal 2‐D morphodynamic model mimicking the present QE settings. Our results indicate that the morphological evolution is controlled by the combination of river discharge and tides. The seasonal and interannual cycles of river discharges play a major role on the inside bar evolution. The bar is eroding during high river discharge periods, but accretion prevails during low river discharge periods. Meanwhile, the highest part of the sand body can move downstream or upstream by several kilometers, modifying the seasonal sediment exchange patterns. We also show that the Coriolis force plays an important role on the dextral morphology patterns in wide, convergent estuaries. It induces a significant lateral water level difference and a large‐scale gyre of residual sediment transport. Subsequently, the seaward tail of the inside bar shifts southward to help create a condition for the development of tidal flats in the lower reach of the estuary. The lateral bed level differences induced by Coriolis force are up to several meters. Coriolis effects also modify the behavior of flood and ebb tidal channels.

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“…As one of the most important factors of water environment variations, suspended sediment carries a large amount of pollutants, including nutrients and heavy metals, affecting the water turbidity, bottom elevation evolution and hydrodynamic process in the long term. The numerical model has been widely used to study the suspended sediment transport process, calibrating and validating the physical parameters, and analyzing the relationships between sediment transport, erosion, and sedimentation [1][2][3][4][5][6][7]. Human activities like sand dredging in the navigation channel and harbor, building artificial islands by dredger, and lifting sediment into water in the coastal zones have great impacts on the suspended sediment concentration (SSC) in an aquatic ecosystem [8].…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Remote Sensed Dredging Impacts on the Suspended Sediment Transport in China’s Largest Freshwater Lake

Chen

et al. 2019

Water

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As the largest freshwater lake in China, Poyang Lake plays an important role in the ecosystem of the Yangtze River watershed. The high suspended sediment concentration (SSC) has been an increasingly significant problem under the influence of extensive sand dredging. In this study, a hydrodynamic model integrated with the two-dimensional sediment transport model was built for Poyang Lake, considering sand dredging activities detected from satellite images. The sediment transport model was set with point sources of sand dredging, and fully calibrated and validated by observed hydrological data and remote sensing results. Simulations under different dredging intensities were implemented to investigate the impacts of the spatiotemporal variation of the SSC. The results indicated that areas significantly affected by sand dredging were located in the north of the lake and along the waterway, with a total affected area of about 730 km2, and this was one of the main factors causing high turbidity in the northern part of the lake. The SSC in the northern area increased, showing a spatial pattern in which the SSC varied from high to low from south to north along the main channel, which indicated close agreement with the results captured by remote sensing. In summary, this study quantified the influence of human induced activities on sediment transport for the lake aquatic ecosystem, which could help us to better understand the water quality and manage water resources.

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Sediment distribution study in the Gulf of Kachchh, India, from 3D hydrodynamic model simulation and satellite data

Cited by 15 publications

References 9 publications

Anomalous inland influx of the River Indus, Gulf of Kachchh, India

Anomalous inland influx of the River Indus, Gulf of Kachchh, India

Morphodynamic modeling of a large inside sandbar and its dextral morphology in a convergent estuary: Qiantang Estuary, China

Numerical Study of Remote Sensed Dredging Impacts on the Suspended Sediment Transport in China’s Largest Freshwater Lake

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