An Exploration on the Natural Morphology and the Siltation and Erosion Development of the Jiaozhou Bay in Recent 130 Years

Based on the bathymetric charts for the Jiaozhou Bay in different periods, the quasi quantitative analyses of the Jiaozhou Bay siltation and erosion situations were made by using digitizer and geo software to determine the siltation and erosion areas in the bay and to give the historic development trends. It is shown from the analysis results that the Jiaozhou Bay before the 1980s was basically in a siltation and shrink situation with the Cangkou channel, the central bay area and the inlets along the coastline being siltation areas and the bay mouth and outer bay being erosion areas; but the Jiaozhou Bay from the late 1980s to the early 1990s was in an erosion situation with radial erosion areas from the bay mouth to the inner bay and small siltation patches between the erosion areas.