Chengdao area, northeast of Huanghe subaqueous delta is typically characterized by the geologic hazards , which will threaten the safety of the offshore engineering such as drilling well and drilling oil platform, man-made island and oil transporting pipelines.

Based on the multi -period water depth data of the Huanghe Delta Chengbei sea area, the amount and area of sediment erosion and accumulation are calculated and the corresponding contour diagrams and stereograms are plotted for different phases through computer - based method, and the regularity and characteristics of sediment erosion and accumulation are studied.

The Shengli Chengdao sea area is located in the depositional system of the Yellow River delta, the original delta system has been eroded under the actions of wave and current, and the soft sediments are distributed on part of sea bottom.

A method,named as Recursive Method,has been applied for the calculation of submarine pipeline settlement in the Chengdao sea area of Shengli Oil Field,and the results from this method were compared with those from the Japan Code Method and the Limit Method,which are the two commonly used methods at the present.