Nature-based solutions to improve the summer thermal comfort outdoors

Abstract

Consider nature-based solutions is a key principle to achieve optimal thermal outdoor comfort. This study investigates the effect of natural elements in improving the outdoor thermal comfort in Guelma city, where various planting design of vegetation and water bodies were considered as natural solutions. Microclimatic data was obtained through field measurements with multiple locations within the square May 8, 1945, located in Guelma. First, measurements were compared. Second, they were used as inputs in Envi-Met model to simulate eight scenarios with different type and ratio of vegetation and different water bodies configurations. The findings indicate that the thermal comfort level could be improved by means of two solutions; increasing the vegetation ratio with respect of the air flow and increasing water surfaces within the outdoor space. The combined effect of increased vegetation ratio and linear water bodies is the best solution to achieve optimal thermal comfort level in outdoor spaces.