Study On Dynamical Sedimentation And Erosion-deposition Evolution Of Yellow River Delta

Yellow River Delta is located in the transitional zone of the river-sea interaction, where land and sea interact intensely. This area is not only the sink of the materials from Yellow River into the sea, but also the source of the Yellow River material dispersal system into the Bohai Sea. In order to systematically study on the transportation, transformation and the fate of the materials including freshwater, silt, nutrition salts and pollutants from Yellow River into the sea, two synthetic surveys were carried out from 24 August of 2003 to 27 August of 2003 and from 25 September of 2003 to 26 September of 2003 respectively by Ocean University of China supported by the project of mechanism and protection of erosion-deposition of Yellow River Delta, which is part of National 973 Project of China:"Land-sea interaction and its effect on the environment in the typical estuaries and coastal seas of China. Thirteen boats were used in the first time, ten of which were used to carry on synchronous fixed-point observation. 1262 data of temperature and current flow, and 729 data of salinity and 729 data of suspended sediment were obtained totally. In the second time, three boats were used to carry on synchronous fixed-point observation and three cross section observations. In that cruise, 341 data of temperature and current flow, and 208 data of salinity and suspended sediment were obtained totally. In addition, the terrain data of Yellow River Delta from 1960 to 2003 were collected.In this paper, firstly, the survey data in the Yellow River estuary area during flood and drought are applied to analyze the hydrological characteristics and the characteristics of the sediment during drought and flood, respectively. Freshwater dispersion, fresh-saline water mixing, saltwater intrusion, sediment transportation, estuarine circulation and turbidity maximum are studied in detail. Secondly, the terrain data is applied to calculate the erosion-deposition rate of Yellow River Delta. An EOF&ANN statistical model is developed to describe and forecast the topographic...