Junke (Drinker) Guo is an Associate Professor in the Department of Civil and Environmental Engineering at the University of Nebraska—Lincoln, USA, and an internationally leading authority in fundamental fluid mechanics, applied hydraulics, sediment transport, and applied hydrology in terms of outstanding contributions to hydraulic and hydrologic engineering literature.
In the field of sediment transport, Prof. Guo’s contributions mainly include: (1) He presented the first complete unsteady sediment settling velocity solution, which has been a classic solution in Jan’s (2019) textbook: Mechanics of Sediment Transport, published in Taiwan. (2) He derived the exact procedure for Einstein–Johnson’s sidewall correction in open channel flow, which is required for almost all sediment transport studies in flume experiments. (3) He proposed a general empirical model for Shields diagram and its applications, which simplifies the calculation of bedload critical shear stress. (4) He presented a generalized bed load function based on empirical data, which unifies Einstein’s statistical method and Mayer-Peter’s deterministic method into a single equation and unifies the high- and low-shear-stress bedload transport equations into a single law. This article is the 2023 best Technical Note in the ASCE Journal of Hydraulic Engineering. (5) Prof. Guo, together with Prof. Pierre Y. Julien, derived the series solutions to Einstein’s sediment transport integrals, which results in the USBR’s modified Einstein’s bedload function. (6) Prof. Guo also contributed to bridge scour study. A representative paper is the semi-analytical model for temporal clear water scour at prototype piers, which describes both flume and field data accurately and has been an important reference for the FHWA Hydraulic Research Program.
Modelling river bedform evolution
In this keynote speech of the 15th International Symposium on River Sedimentation, Prof. Guo will present a simple mathematical model on river bedform evolution, which can generate all bedform patterns, including ripples, dunes with ripples superposed, dunes, washed-out dunes, upper-regime plane bed, standing waves, anti-dunes, and anti-dunes with pools and chutes.