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Near shore waves,long-shore currents and sediment transport along micro-tidal beaches,central west coast of India

International Journal of Sediment Research 2014年第3期29卷 402-413页

作者： Sajiv Philip CHEMPALAYIL V.Sanil KUMAR G.Udhaba DORA glejin johnson CSIR-National Institute of Oceanagraphy Dona PaulaGoaIndia

Coastlines are undergoing constant geomorphologic changes with respect to the incident wave *** on waves measured at 9 m water depth,simulation of near shore wave transformation is done using REFDIF-1numerical model and the near shore breaker parameters are estimated at two micro-tidal beaches along central west coast of *** results are validated with measured *** the breaker parameters,long-shore current and long-shore sediment transport rates(LSTR) are computed by using semi-empirical *** long-shore current and LSTR are showing dramatic variations with respect to *** direction of LSTR is observed towards north since the approach waves are from south-west direction during pre-monsoon and post *** monsoon season,waves are from west south-west and resulted in southerly *** estimated annual net and gross LSTR by Cambridge Environmental Research Consultants(CERC) at two locations are in the same order whereas LSTR estimated by Walton & Bruno and Kamphuis equations are showing different estimations because of difference in surf-zone width and foreshore slope between the two *** micro-tidal beaches with length less than 6 km,Kamphuis equation is giving agreeable estimation of *** analysis of LSTR estimate shows that coastal inclination is the prominent factor in determining LSTR than incident wave angle.

关键词： Near-shore sedimentation Littoral zone Wave refraction Wave measurement Coastal zone management Karnataka coast

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Textural characteristics of foreshore sediments along Karnataka shoreline,west coast of India

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International Journal of Sediment Research 2011年第3期26卷 364-375页

作者： G.Udhaba DORA V.Sanil KUMAR C.Sajiv PHILIP glejin johnson P.VINAYARAJ R.GOWTHAMAN Ocean Engineering Division National Institute of Oceanography(Council of Scientific & Industrial Research)Dona PaulaGoa-403 004India

Grain character analysis of beach sediments along three selected beaches(Pavinkurve,Kundapura and Padukare)of Karnataka coast,west coast of India is carried out in the present *** objective was to identify the textural behavior of beach sediments during an annual cycle from March 2008 to February *** characteristics such as central tendency,sorting,kurtosis and skewness were estimated using GRADISTAT and *** maximum(62%)sediment samples were medium sand with unimodal and bimodal characters at all the three *** median values varied in between-0.04φand 2.74φwith an average value of 1.61φ.The beaches were characterized as well sorted,moderately well sorted and moderately sorted sediment *** were identified as fine skewed to coarse skewed with platykurtic,mesokurtic and leptokurtic characters. Grain characteristics varied spatially and temporally along with beach orientation,foreshore slope and wave action.A negative correlation between mean and sorting is identified for maximum number samples along the study region but not very *** study shows that the sedimentary environment at Kundapura were influenced by relatively high wave action compared to Padukare and Pavinkurve beach and the beaches were under erosion or non-deposition with strong winnowing process.

关键词： Cumulative percentage distribution Central tendency Sorting Skewness Kurtosis

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Quantitative Estimation of Coastal Changes Along Selected Locations of Karnataka, India: A GIS and Remote Sensing Approach

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International Journal of Geosciences 2011年第4期2卷 385-393页

作者： P. Vinayaraj glejin johnson G. Udhaba Dora C. Sajiv Philip V. Sanil Kumar R. Gowthaman 不详

Qualitative and quantitative studies on changes of coastal geomorphology and shoreline of Karnataka, India have been carried out using toposheets of Survey of India and satellite imageries (IRS-P6 and IRS-1D). Changes during 30 years period are studied at each station. Significant morphological changes in landforms like spit, channel Island, coastal plain, tidal flat, lateritic plain, alluvial plain and sand bar within and adjcent to estuarine river mouths of Kali, Sharavathi, Kollur-Chakkara - Haladi and Udyavara Rivers are observed. The study indicates that gradual erosion is observed at i) Karwar spit along the northern side of the Kali river mouth, ii) the spit at the southern side of the Sharavathi river mouth and iii) at some regions of Kundapur.

关键词： Coastal Geomorphology Shoreline Coastal zone Erosion Accretion Beach

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Variations in Swells along Eastern Arabian Sea during the Summer Monsoon

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Open Journal of Marine Science 2012年第2期2卷 43-50页

作者： glejin johnson V. Sanil Kumar Sajiv Philip Chempalayil Jai Singh Premanand Pednekar K. Ashok Kumar G. Udhaba Dora Rajamanickam Gowthaman Ocean Engineering CSIR-National Institute of Oceanography (Council of Scientific & Industrial Research) Dona Paula India

A study was carried out to find the variation in wave characteristics along the eastern Arabian Sea and the influence of swells in the nearshore waves at 3 locations during summer monsoon in 2010. Percentage of swells in the measured waves was 75% to 79% at the locations with higher percentage of swells in the northern portion of Arabian Sea com-pared to that at the southern side. The significant wave height up to 4.7 m and maximum wave height up to 7.4 m was observed. The wave height was increasing from south to north with the average significant wave height at the northern location 20% more than that at the southern location due to the increase in the swell height. Waves having spectral peak period less than 6 s were not present during the summer monsoon period. There was no change in the average value of wave statistical parameters for data collected at 1/2, 3, 6, 12 and 24 h interval.

关键词： Seas Swells Wind Waves Arabian Sea Mixed Sea State Wave Spectrum

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