Preliminary study on the mechanism of the erosion-deposition adjustment in the tidal inlet out of the Oujiang Estuary

doi:10.3969/j.issn.1001-909X.2017.02.004

Abstract

Abstract: With the application of GIS technology, the hydrographic data were transformed to DEM (digital elevation model) to calculate the amount of erosion and deposition, and then the evolution process of the main geomorphic units and their mechanism were also analyzed. There were several cognitions after analyzing: (1) The tendency of the sea bed erosion-accretion process was light scour, with 27 cm rang in 72 years and at the rate of 0.375 cm/a. (2) The deep channels expanded all the time. the Wenzhou Sand Bank was kept accretion tendency, and human activities speeded up this tendency for these years. Zhongsha Sand Bank and Chongshan Sand Bank were kept scour tendency, finally linked each other and became a new Zhongsha Sand Bank in 1992. (3) Under the dynamic mechanism, the sediment movement occured between deep channels and sand banks, which was the mechanism of erosion-deposition evolution in the sea bed.

Key words: Oujiang Estuary, tidal inlet, GIS, erosion-deposition evolution, geomorphic unit

CLC Number:

P737.1

XU Hai, WANG Jing, ZHOU Hong-quan. Preliminary study on the mechanism of the erosion-deposition adjustment in the tidal inlet out of the Oujiang Estuary[J]. Journal of Marine Sciences, 2017, 35(2): 33-43.

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