Sediment distribution and transport pattern in the nearshore region,southeast coast of India  

作　　者：Umakanta Pradhan Subrat Naik Pravakar Mishra Uma Sankar Panda M.V.Ramana Murthy 

机构地区：[1]National Centre for Coastal Research,Ministry of Earth Sciences,NIOT Campus,Pallikaranai,Chennai 600100,India

出　　处：《Anthropocene Coasts》2024年第1期226-244,共19页人新世海岸(英文)

基　　金：study was part of the project on“Water Quality Prediction,Chennai”;This manuscript has an NCCR contribution no-NCCR/MS/407.

摘　　要：The present paper aimed to assess the sediment distribution pattern,mode of transport,and its interaction with hydrodynamic and topographic conditions at different depths and regions along the east coast of India.About 900 surficial sediment samples were collected and analysed on a monthly basis for the Chennai coastal region at 32 stations from 2013 to 2015.The study region is classified into four types,such as beach,inlet,5 m,and 10 m depth.Sediment textural and grain size trend analyses were conducted to achieve the objectives.Sediment characteristics for the region were recorded as sandy,equally dominated by unimodal and bimodal at the beach,while unimodal at shallow depths(5 and 15 m).The sediments were medium sand to coarse sand at the beach,mostly fine followed by medium at 5 and 15 m depths.The sediment sorting is dominated by moderately well-sorted sediments;the skew-ness of beach sediments was negative,while nearshore sediments were found positive;average kurtosis values of sediments were noticed to be mesokurtic.The CM plot depicts that the sediments were mostly derived by tractive current,and the modes of transport are“bottom suspension and rolling”and“graded suspension no rolling”at beach locations and shallow water depths,respectively.The GSTA analysis reveals the annual average sediment transport pattern is northerly.The numerical hydrodynamic study confirms the GSTA and CM plot analysis.The study reveals a stable sedimentary environment south of the Chennai port and instability in the northern part.The study includes large spatiotemporal nearshore sediment data with hydrodynamic conditions,immensely helpful to coastal stake-holders and researchers.

关 键 词：Sediment texture Hydrodynamic modelling Transport pattern CM plot GSTA East coast of India 

分 类 号：P73[天文地球—海洋科学]