lopography and evolution of the tidal trench in the eastern Chongming tidal flat, Changjiang River Estuary

Abstract

Abstract: Tidal trenchs are important channel for material transport and water energy exchange in theintertidal zone. In this study,TM and ETM remote sensing (RS) images of 1994,2000 and 2009 and GIStechnology were used to define the plane morphology and calculate the length and density of the tidaltrenches;RTK-GPS was used to make in situ measurements of topography for determining a typical tidaltrench development hight,width,depth,width-depth ratio and longitudinal variation of the cross-sectionarea; and GIS was used to establish the DEM model of the trench.The results show that (l) in the easternChongming tidal flat, tidal trenches are developed mainly in the salt marsh,and the northern and middle partsof 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/km² respectively,theydecreased to ll.l km and 459 m/km² in 2000 because of reclamation of the upper salt marsh and increased to31.8 km and 98l m/km³ in 2009 due to seaward silting of the salt marsh,which reflect the impacts of naturalaction and human activities on the flat;(3) not like the typical evolutionary feature of lateral movement inEurope and America,the evolution of the tidal trenches in the eastern Chongming tidal flat is mainlycharacterized by successive longitudinal extension (with the sea ward silting of the salt marsh); (4) from themouth of the tidal trenches upward,the ratio of width to depth decreased from >340 to≤<18,and the depthfirst increased and then decreased. This study shows that 3S technology has advantages over traditionalmethods in quantitative study of large spatial and temporal scale evolution of tidal trenches.

Key words: tidal trench, 3S technology, eastern Chongming tidal flat

CLC Number:

P737.1

LIUJian-hua, YANG Shi-lun, SHI Ben-wei, LUO Xiang-xin, FU Xin-kun. lopography and evolution of the tidal trench in the eastern Chongming tidal flat, Changjiang River Estuary[J]. Journal of Marine Sciences, 2012, 30(2): 43-50.

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