Yifan Yang

Yifan Yang
The University of Waikato · School of Engineering

Doctor of Philosophy
Advancing research on scour and erosion, sediment transport, and wider river and coastal engineering themes.

About

27
Publications
5,804
Reads
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114
Citations
Introduction
Currently, my research concentrates on three main aspects: 1. Scour and erosion hazards in fluvial and marine environments. 2. Hydro-morphodynamics and the anthropogenic influence on sediment transport. 3. Integrated management of urban water resources. My personal research website: https://yifan-yang.com/

Publications

Publications (27)
Article
Full-text available
Laboratory experiments were performed to study the impact of relative particle protrusion P/D (P is the protrusion height and D is the diameter of the spherical target particle) on the entrainment of sediment particles from a rough bed of spherical grains. The target particle to be entrained was instrumented with electronic sensors, that measure th...
Article
Full-text available
The Smart Sediment Particle (SSP) instrumented with multiple sensors to obtain tri-axial linear accelerations is used for studying the mechanism of coarse grain entrainment. Three bed arrangements are tested to examine their influences on entrainment processes and the threshold force and impulse conditions. The SSP shows satisfactory precision to c...
Article
Full-text available
Accurate estimation of local scour depths at piers is important since underestimation can result in structural failure and possibly loss of lives and overestimation the needless waste of structure cost, which can be significant for large structures. An improved mathematical model for estimating equilibrium structure-induced (local) sediment scour d...
Article
Full-text available
This paper presents an investigation of near-bed hydrodynamics for a protruding coarse particle over a regular roughened bed. The laboratory experiments were undertaken at the threshold flow condition, which induced dislodgement of the protruding particle. Using different protrusion heights, the experimental results show that the protruding particl...
Article
This paper presents a study for identifying damage severity and location in the supporting system of tether-type submerged floating tunnel (SFT) as an innovative manner for crossing a variety of water area. A novel sensitive damage detection approach is proposed in the context of statistical pattern recognition to analyze the vibrating behaviors of...
Article
Full-text available
Hydrodynamic forces, especially uplift forces, during a flood event are critical to the stability of bridge superstructures. This study focuses on the interaction between the migrating dunes, the scour depth beneath the deck, and the uplift force that fluctuates during bedform migration. Experimental results show that the fluctuation of uplift forc...
Article
Full-text available
Bridge abutment-induced sediment scour in compound river channels is time-sensitive during floods, and, thus, estimating the scour rate has significance in design. In the current study, large-scale laboratory experiments were done to examine the influence of multiple factors on scour evolution, including channel geometry, bed mobility (clear-water...
Article
Full-text available
Waves characteristics of the developing windfarm in the semi-enclosed Hangzhou Bay are distinctive due to the East Asian monsoon and frequent typhoons. In this paper, statistical analysis is performed to study the wave parameters in central Hangzhou Bay using three year-long wave datasets and the companion wind data. The monsoonal pattern has a sig...
Article
Flood risk assessment and management in urbanized area experience an increasing reliance on the supporting information provided by numerical flood modeling as a rapid and efficient tool. Although hydrodynamic modeling based on shallow water equations requires less parameters than hydrologic ones, uncertainties of the input factors describing both t...
Article
Full-text available
Local scour at pile-supported bridge foundations in coastal and offshore areas are an essential factor to engineering design and evaluation. This study experimentally investigates live-bed local scour at complex bridge piers under the influence of bed-form migration. The results show that the variation of the mean scour depth as a function of flow...
Article
Fluvial morphology in compound river channels usually undergoes drastic variation during extreme floods due to scour and erosion processes. Those processes can be highly dynamic consisting of multiple elements (e.g. bed-form migration, bank erosion, riprap break-down, etc) that are inter-dependent. The existence of bridge abutments and embankments...
Article
Full-text available
This study investigates the flood flow characteristics in a compound channel subject to both lateral contraction (caused by bridge abutment/embankment) and vertical contraction (caused by bridge deck submergence) at bridge sites. Three abutment setback distances and three pressure flow types (free surface (FS), submerged orifice (SO) and overtoppin...
Article
Full-text available
Scour at bridge abutments usually consists of local and contraction scour that correlate because of the flow field that develops both scours. Flume experiments were conducted using simulated compound channels to investigate the effect of a setback vertical-wall abutment’s streamwise contraction length on the scour depth and pattern. The adequacy of...
Article
Full-text available
This study reviewed the existing experience of implementing the nation-wide freshwater health evaluation in China and around the world and proposes a new framework that works in collaboration with the River Chief System (RCS). The institutional context of China with intertwined political and scientific considerations makes it essential to establish...
Data
This video corresponds to Figure 8. Yang, Y., Melville, B. W., Macky, G. H., & Shamseldin, A. Y. (2020). "Experimental study on local scour at complex bridge pier under combined waves and current." Coastal Engineering.
Article
Full-text available
This paper presents an experimental study on scour at complex bridge piers exposed to combined waves and current. Regular waves were produced with various strength and superimposed on co-directional current with constant velocity. The key parameters tested and discussed include Keulegan-Carpenter () number, relative current strength , pile-cap elev...
Article
Full-text available
Scour at bridge piers is time-dependent. In this paper, temporal evolution of clear-water scour at complex bridge piers is studied experimentally. The pier model has a typical form comprising three components, viz. a rectangular column, a rectangular pile-cap, and a group of vertical piles underneath. Various relative pile-cap positions and skew an...
Article
Full-text available
In this study, we investigated the characteristics of scour at complex bridge piers in close proximity. The experiments were performed under both clear-water and live-bed flow regimes. We compare our results with those for a single complex pier. Further, the performance of existing predictors is discussed. In this study, four typical pier arrangeme...
Article
Full-text available
An investigation of the characteristics of live-bed scour at circular and skewed rectangular (slab) piers in comparatively shallow flows is presented. The 110 experiments were undertaken in a 2.4-m flume using two circular piers and a slab (long) pier. Based on flow shallowness, that is, the ratio of approaching flow depth (y0) to pier diameter (D)...
Chapter
Scour at bridge pier under live-bed regime represents the existence of sediment motion on the bed both upstream and downstream of the pier. The bed mobility leads to the formation of bed-forms, thereby bringing fluctuations to the scour depth at the pier due to the passing bed-forms entering and leaving the scour hole. Because of the difficulties o...
Article
Full-text available
An experimental study on flow-induced clear-water local scour at complex bridge piers was conducted using two typical pier models, nine pile-cap elevations, and seven pier skew angles from 0° to 90° with a 15° interval. Results show that a slight skew angle α imposed on an originally aligned pier can significantly increase the equilibrium scour dep...
Conference Paper
This paper discusses the scale-effects of flow-field and relative sediment size of scour at bridge pier, which are usually met and considered in laboratory experiments. Both the situations with simple and complex pier geometry are discussed. The flow-flow scale can be divided into three categories by the flow shallowness ratio y_0/D: narrow-pier (y...
Conference Paper
Full-text available
Estimation of bridge scour depth is a common problem encountered by hydraulic engineers involved in the design of major transport infrastructure. While there are standard scour depth estimation methods available, most of them were developed based on uniform pier configurations. Typical floodplain bridge structures in many of the recently constructe...
Conference Paper
A laboratory study on clear-water local scour at a complex pier is performed to investigate effects of pier skewness and the pile-cap elevation on scour depth. The model has a 3:50 scale, and is representative of several bridge piers that failed in New Zealand in the past decades. The model pier consists of a wall-like rectangular column, a rectang...

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Projects

Projects (3)
Archived project
This project is undertaken in collaboration with Nanjing Hydraulic Research Institute (NHRI) and is commissioned and partially sponsored by the Ministry of Water Resources of China.
Project
A portion of this project was sponsored by the American Association of State Highway and Transportation Officials (AASHTO), in cooperation with the Federal Highway Administration, and was conducted in the National Cooperative Highway Research Program (NCHRP Project 24-37), which is administered by the Transportation Research Board (TRB) of the National Academies of Sciences, Engineering, and Medicine.
Archived project
PhD research project.