Quantitative analysis on evolution of erosion and deposition in Nanhui tidal flat of Yangtze estuary

Author

Zheng, Maohui ; Jiang, Simin ; Xing, Fei

Author_Institution

Shanghai Inst. of Disaster Prevention & Relief, Tongji Univ., Shanghai, China

fYear

2011

fDate

15-17 April 2011

Firstpage

3450

Lastpage

3453

Abstract

Nanhui tidal flat is a transitional zone situated in a special area between the Yangtze estuary and Hangzhou Bay. Supported by GIS, six topographic maps from 1953 to 2004 are digitalized. Meanwhile, the underwater digital elevation models between different periods are created and analyzed to investigate the topography evolution on Nanhuizui tidal flat. The results suggest: there was distinct erosion - accretion variation in this area in recent 46a; from 1983 to 1990, the amount of erosion was 9.94 × 10⁶ m³ (the erosion rate was 2.71 cm/a); while from 1990 to 1994, it turned to accretion (the accretion rate was 3.70 cm/a); from 1995 to 2000, the accretion rate increased to 6.45 cm/a. from 2000 to 2004, the accretion rate decreased to 4.57 cm/a, due to the anthropic activities and the adjustment of the tidal flat itself.

Keywords

accretion; cartography; digital elevation models; erosion; geographic information systems; oceanographic regions; rivers; topography (Earth); GIS; Hangzhou Bay; Nanhui tidal flat; Nanhuizui tidal flat; Yangtze estuary; accretion rate; accretion variation; anthropic activities; erosion rate; topographic maps; topography evolution; transitional zone; underwater digital elevation models; Digital elevation models; Geographic Information Systems; Rivers; Sediments; Soil; Surfaces; Water conservation; DEM; GIS; Nanhui tidal flat; evolution of Erosion and Deposition;

fLanguage

English

Publisher

ieee

Conference_Titel

Electric Information and Control Engineering (ICEICE), 2011 International Conference on

Conference_Location

Wuhan

Print_ISBN

978-1-4244-8036-4

Type

conf

DOI

10.1109/ICEICE.2011.5777917

Filename

5777917