SURVEY ON THE DISTRIBUTION OF FLUID MUD AND DISTURBED STRATA ON SUBAQUEOUS YELLOW RIVER DELTA

Abstract

From the acoustical exploring data of Sub-bottom profiler and Echo Sounder, it is found that fluid mud layer and partial disturbed strata existed in the subaqueous Yellow River Delta. The fluid mud is widely distributed in the study area, and the average thickness of the fluid mud is about 10cm. The distribution of fluid mud is relatively uniform and thicker in the flat area than terrain undulating area, and the fluid mud is in a spot distribution in low-lying areas. The disturbed strata is easy to identify according to the acoustical exploring data of superficial strata, due to difference from the ambient undisturbed strata in many aspects. The initial disturbed strata further expended in the space compared with the results of acoustical exploring data in 2003. This paper further illustrates the formation mechanism of disturbed strata under the storm waves based on the achievements of researches. The disturbed strata formed under the action of storm waves accompanied by negative topography. However, the long-time differential erosion under the hydrodynamic action of disturbed and undisturbed strata caused the disturbed negative topography switch to positive topography.