Case Study: Hydraulic Model Experiment to Analyze the Hydraulic Features for Installing Floating Islands

Abstract

The viewpoint of a river is changing as people regard the river as water-friendly space where they can enjoy and share the space beyond the simple purpose of flood control alongside the improving social level. The floating islands installation was planned featuring three islands. The river’s flow and channel stability could be changed when new structures are built in a river. Hence an analysis of the hydraulic characteristic changes should need. The hydraulic model experiment in this study sought to review the impacts of the floating islands installation on the safety of flood control and stability of river channel. This study analyzed the hydraulic features affecting the surrounding stability when installing floating islands and proposed stable floating islands layout in terms of hydraulics based on the experiment results

Technical note: Laboratory modelling of urban flooding: strengths and challenges of distorted scale models

“…Distorted models have been used for a broad range of applications in fluvial and coastal hydraulics. Among others, Jung et al (2012) applied scale factors e H = 120 and e V = 50 to study a floating island in a river; Wakhlu (1984) obtained comparable results on an undistorted (e H = e V = 36) and a distorted model (e H = 100; e V = 17) of a river division weir. However, since a distorted laboratory model corresponds to a representation of the prototype shrunk differently along the horizontal and the vertical directions, it may also lead to specific artefacts in the laboratory observations.…”

“…Specifically, reliable predictions of flood hazard are a prerequisite for supporting flood risk management policies. This includes the accurate estimation of inundation extent, spatial distribution of water depth, discharge partition and flow velocity in urbanized flood-prone areas, since these parameters are critical inputs for flood impact modelling (Dottori et al, 2016;Kreibich et al, 2014;Molinari and Scorzini, 2017). State-of-the-art numerical inundation models benefit from increasingly available remote sensing data, such as laser altimetry (e.g.…”

Numerical Insights Into the Effects of Model Geometric Distortion in Laboratory Experiments of Urban Flooding

“…Novak et al (2010) describe a laboratory‐scale model of river Dargle in the town of Bray (Ireland) built with e H = 100 and e V = 50 ( e H / e V = 2) to assess the performance of flood mitigation measures for various tidal events. Jung et al (2012) used e H = 120 and e V = 50 ( e H / e V = 2.4) to study the effect of a floating island in a river, while Wakhlu (1984) obtained comparable results in an undistorted ( e H = e V = 36) and a distorted model ( e H = 100 and e V = 17) of a river division weir.…”

A novel platform to evaluate the dampening of water and solute transport in an experimental channel under unsteady flow conditions

“…Rare are the experiments that deal with solute transport in channels under well‐controlled conditions and unsteady state flow events. In the literature, some studies were carried on real‐scale channels (e.g., Errico et al, ; Newson, ; Rudi, Bailly, Belaud, & Vinatier, ) and on laboratory channels (Vinatier, Bailly, & Belaud, ) for various purposes according to project features: impact of land use change on floods (Jung, Kang, Hong, & Yeo, ), impact of dikes on inundation (Ettema & Muste, ), impact of vegetation on hydraulic resistance (Defina & Peruzzo, ; Errico et al, ), role of flow conditions in hydraulic properties (Rouzes, Moulin, Florens, & Eiff, ) and in biofilm colonization (Coundoul et al, ), and so on. The experiment size should verify hydraulic laws of similitude (Chanson, ).…”