An experiment study of erosion characteristics of sediment bed at the Yellow River Delta

Lianqiang Shi , Jiufa Li , Ping Dong, Ming Ying , Weihua Li , Shenliang Chen

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    3 Citations (Scopus)

    Abstract

    The modern Yellow River Delta is formed by fine-grained sediments through fast transportation and accumulation. Its coast is characterized by partially consolidated bed structure, high water content and weak erosion resistance. Despite recent advances in numerical morphodynamic modeling techniques, the current ability to predict long-term coastal changes at the Yellow River Delta is hampered by the lack of reliable data on the erosion resistance of the sediments deep in the bed. This paper describes a laboratory-based erosion study using a 30 m sediment core collected from the tidal. at on the northern coast of the Yellow River Delta in April 2004. The influence of various sediment properties such as bed strati. cation, grain composition, wet bulk density and water content on the measured erosion resistance has been analyzed in detail. The results reveal that there exist a definite negative relationship between the critical erosion shear stress and water content or median diameter, and also a clear positive relationship between the critical erosion shear stress and clay content. For the sediments of the same type, there was a positive relationship between the critical erosion shear stress and wet bulk density. It was also found that the erosion resistance changes considerably through depth with the lowest being near the surface and the highest at a depth of 9.1-13.5 m. The relationship between erosion rate and shear stress for erosion was shown to be dependent in a complex way on the grain distribution, sedimentation structure, wet bulk density and water content of the sediments. A number of distinct erosion behavior have been identified and although in most cases the erosion rate (e) can be related linearly to the net bed shear stress (T-T-c), further study is needed to establish the erosion-stress relationship for the case where the erosion seems to show undulating behavior.

    Original languageEnglish
    Pages (from-to)25-43
    Number of pages19
    JournalCoastal Engineering Journal
    Volume49
    Issue number1
    DOIs
    Publication statusPublished - 2007

    Keywords

    • modern Yellow River delta
    • sediment characteristic
    • erosion experiment
    • critical erosion shear stress
    • erosion rate
    • SHEAR-STRESS
    • IN-SITU
    • INTERTIDAL SEDIMENTS
    • COHESIVE SEDIMENTS
    • MUD/SAND MIXTURES
    • MARINE-SEDIMENTS
    • BENTHIC DIATOMS
    • WADDEN SEA
    • ERODIBILITY
    • THRESHOLD

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