EVOLUTION OF MOUTH BARS IN THE CHANGJIANG ESTUARY, CHINA: A GIS SUPPORTING STUDY

摘要

Supported by GIS, 10 pieces of charts of the Changjiang Estuary from 1842 to 1997 are studied. Digital elevation models of Changjiang Estuary is established with Kriging gridding method to research evolution of channel, change of coasts, formation and evolution of islands in mouth bar area with different points of view: transverse sections, longitudinal profiles, plane change, etc. Furthermore, the channel-fill volumes are calculated and calculations of amount of deposition or erosion in different scope between different years are conducted.