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- W2371211329 abstract "Tidal trenchs are important channel for material transport and water energy exchange in the intertidal zone.In this study,TM and ETM remote sensing(RS) images of 1994.2000 and 2009 and GIS technology were used to define the plane morphology and calculate the length and density of the tidal trenches;RTK-GPS was used to make in situ measurements of topography for determining a typical tidal trench development hight,width,depth,width-depth ratio and longitudinal variation of the cross-section area;and GIS was used to establish the DEM model of the trench.The results show that(1) in the eastern Chongming tidal flat,tidal trenches are developed mainly in the salt marsh,and the northern and middle parts of the tidal flat are dominated by single and slightly curved ones,whereas the southern part by dendritic ones; (2) the total length and density of the tidal trenches in 1994 were 30.9 km and 717 m/km~2 respectively,they decreased to 11.1 km and 459 m/knr in 2000 because of reclamation of the upper salt marsh and increased to 31.8 km and 981 m/kirr in 2009 due to seaward silting of the salt marsh,which reflect the impacts of natural action and human activities on the flat;(3) not like the typical evolutionary feature of lateral movement in Europe and America,the evolution of the tidal trenches in the eastern Chongming tidal flat is mainly characterized by successive longitudinal extension(with the seaward silting of the salt marsh);(4) from the mouth of the tidal trenches upward,the ratio of width to depth decreased from 340 to 18.and the depth first increased and then decreased.This study shows that 3S technology has advantages over traditional methods in quantitative study of large spatial and temporal scale evolution of tidal trenches." @default.
- W2371211329 created "2016-06-24" @default.
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- W2371211329 date "2012-01-01" @default.
- W2371211329 modified "2023-09-27" @default.
- W2371211329 title "Topography and evolution of the tidal trench in the eastern Chongming tidal flat,Changjiang River Estuary" @default.
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