Testing Research And Numerical Simulation On The Response Of Sediment To Waves On The Yellow River Delta

The paper includes six parts: the first part summarizes the significance of the research, researching situation and its comment; the second one shows the testing research work in situ and in the laboratory; the third one is the settling and analysis of these data; the fourth part introduces the numerical model of the response of sea-bed to waves; In the fifth part we commends the effects of the different wave parameters and soil parameters; the last part is the analysis of numerical simulation of strength heterogeneity of sediment.The surfacial sediment on the Yellow River Delta is so sensitive to ocean hydrodynamic condition, especially waves that soil failed and came into being a lot of unstable features: bumps and hollows, flute and groove cast of silt and collapse. The disruptive phenomenon is related to the change of sediment strength under the wave loading tightly. In the former researches, scholars mainly studied following static aspects: topography and geomorphy, ocean hydrodynamic condition and soil engineering features. There is a lack of researches on the heterogeneity of sediment strength and the regular distributing characteristics.The study area lies in the tidal flat of a delta-lobe which came into being between 1964 and 1976. The study areas have same engineering geological environment; one oil-field road was built for exploring petroleum to be formed a wave barrier in 1995. The hydrodynamic condition between the both of side is different. A large amount of data were acquired from the measurement in situ surfacial soil strength on the tidal flat by using portable cone penetration, shallow drilling, laboratory analysis of delta, and other means. Through the settling and analysis of these data, we find that the seabed sediments intensity appears heterogeneity on the plain and the profile under the actionof wave loading, i.e., the random or periodic variation of seabed soil intensity in the plain, and hard soil layer in certain depth under the bottom.Based on Biot's consolidation and simplified sea-bed to two dimensional sea-bed, numerical simulation about the response of sea bed to waves is developed. The assumption was wielding, such as linear wave loading, linear elastic skeleton of soil and Darcy's law flow. A numerical calculation is developed about the response of sea-bed to wave loading on the Yellow River Delta. We find that: (1) the effects of wave parameters and soil characteristics on the response of sea-bed to waves are obvious: Wave height and wave length are important parameters among wave parameters; shear modulus is dominating parameter among soil parameters. (2) heterogeneity of sediment strength has affinity with the distributing of stress field, displacement field and the pore water pressure and the failure of partial soil under wave loading.