This study was conducted to examine the effect on airflow of shape an urban road green belt in asymmetrical street canyon. In this paper, field at pedestrian height with different building ratios (ASF) both sides is modeled and simulated using computational fluid dynamics (CFD) software, ANSYS FLUENT, flow rate characteristic distribution index average intensity are used evaluate analyze level....

It is well known that a GPS receiver needs to “see” at least four satellites to provide a 3D fix solution. But in difficult environments such as an urban canyon, the number of “visible” satellites is often not enough. WiFi signals have been utilized for positioning mainly based on the fingerprinting technology. However, the accuracy of WiFi positioning outdoors is from several tens of meters to...

In this study, a three-dimensional numerical simulation of the wind flow and pollutant transport in street canyons is carried out by a new specific solver, which is developed and coupled into an open source CFD tool box, the OpenFOAM package. The new model has been applied to study the effect of roof shapes and building heights on the flow patterns and pollutant transports in the street canyons...

In this study, the effect of seasonal variation on air flow and pollutant dispersion characteristics was numerically investigated. A three-dimensional urban canopy model with unit aspect ratio (H/D = 1) was used to calculate surface temperature distribution in the street canyon. Four representative time events (1000 LST, 1300 LST, 1600 LST and 2000 LST) during typical clear summer and winter da...

Air pollution remains a major environmental and health concern in urban environments, especially street canyons that show increased levels due to lack of natural ventilation. Previous studies have investigated the relationship between canyon morphology in-canyon levels. However, these are typically limited scale single city-wide assessments on this matter scarce. In 2018, NO2 concentrations wer...

This paper presents an approach designed to derive an urban morphology map from satellite data while aiming to minimize the cost of data and user interference. The approach will help to provide updates to the current morphological databases around the world. The proposed urban morphology maps consist of two layers: 1) Digital Elevation Model (DEM) and 2) land cover map. Sentinel-2 data was used...