Work

Assessing The Effect Of Substrate Porosity Layering On The Water Detention Efficiency Of A Bioretention Cell: A CFD Study

Year: 2025

Type: conference-paper

Abstract: Urbanization has drastically increased sealed surfaces, leading to higher stormwater runoff and subsequent associated risks such as flooding and water quality degradation. Nature-based solutions such as bioretention cells are a sustainable approach to manage stormwaters. The present work studies the effects of soil layer porosity on water detention efficiency of a bioretention cell, using computational fluid dynamics (CFD). Three porosities (0.34, 0.40, and 0.43) and multiple soil layering configurations were analyzed under two inflow rates (1 l/s and 1.5 l/s). Results reveal that higher porosity layers reduce bypass runoff compared to lower porosity layers. Configurations with porosity increasing from bottom to top in order from 0.34, 0.40 and 0.43 achieved the lowest runoff, reducing it by up to 22.14\% for 1 l/s. Configurations with low-porosity layers at the top produced the highest runoff, emphasizing the importance of layer arrangement.

DOI: 10.7148/2025-0307

Authors: Ashish Pawar, Ashvinkumar Chaudhari, Eero Immonen, Jan-Hendrik Korber, Emil Nyman

Institution: Turku University of Applied Sciences

Language: English

Topic: Urban Stormwater Management Solutions

Subfield: Environmental Engineering

Field: Environmental Science

Domain: Physical Sciences

SDGs: Clean water and sanitation, Sustainable cities and communities

Open Access status: gold

Funder: China Scholarship Council

OpenAlex ID: W4412596226