Measuring Bed Exchange Properties of Cohesive Sediments Using Tripod Data
Z. Zhou (TU Delft - Coastal Engineering, East China Normal University)
Jianzhong Ge (East China Normal University, Shanghai Estuarine and Coastal Science Research Center, Institute of Eco-Chongming (IEC))
D.S. van Maren (TU Delft - Environmental Fluid Mechanics, Deltares, East China Normal University)
Jinghua Gu (East China Normal University)
Pingxing Ding (East China Normal University)
Zhengbing Wang (Deltares, TU Delft - Coastal Engineering)
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Abstract
The Krone–Partheniades (K-P) framework has been used for decades to quantify and analyze the sediment exchange at a water–bed interface. Measuring the erosion and deposition parameters that are part of this framework requires time-consuming field observations. Additionally, the erosion parameters are measured independently of deposition parameters, while in reality they are coupled. In numerical models applying the K-P framework these parameters are often assumed to be constant in time and mutually independent. In this study, we develop a relatively simple methodology to determine the erosion and deposition parameters, using conventional near-bed observations of bed level, sediment concentration and flow velocity. This methodology is subsequently applied to tripod observations collected in the Changjiang estuary, China, to compute continuous time-varying erosion and settling parameters. We propose a diagram to visualize the interdependency and accuracy of erosion and deposition parameters, which is the input for K-P framework models requiring this interdependency
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