INVESTIGATION OF SEDIMENT MOVEMENT IN THE NORTH NAVIGATION CHANNEL AREA OF THE ESTUARY OF THE YANGTZE-RIVER USING NATURAL RADIOTRACERS AND INAA METHODS

This is a preliminary investigation of sediment in the North Navigatio n Channel Area of the estuary of the Yangtze river, which has been mad e by determining the natural radioisotopes and the INAA of 30 natural sand samples. Multivariate statistical method was used to process and analyze the data obtained. It can be seen that there are tow sediment movement routes in the investigation area. The orientation of the main sediment movement is from northwest to southeast in accordance with t he results obtained from the field submarine drag-monitorings after th e radiotracer injection. Besides, there is also another sand movement route existed.