Measuring Bed Exchange Properties of Cohesive Sediments Using Tripod Data

作者：Zhou, Zaiyang; Ge, Jianzhong; van Maren, Dirk Sebastiaan^*; Gu, Jinghua; Ding, Pingxing; Wang, Zhengbing

来源：Journal of Marine Science and Engineering, 2022, 10(11): 1713.

DOI：10.3390/jmse10111713

• Krone-Partheniades equations
• observations techniques
• settling velocity
• critical shear stress

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.