The Effect of Geological Heterogeneity and Groundwater Table Depth on the Hydraulic Performance of Stormwater Infiltration Facilities

Urbanization has led to a substantial change in the hydrological cycle of urban catchments. Increased runoff and urban flooding, decreased direct subsurface infiltration and groundwater recharge, deterioration of water quality are among the major effects of this alteration. To alleviate these effect...

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Veröffentlicht in:Water resources management Jg. 33; H. 3; S. 1147 - 1166
Hauptverfasser: D’Aniello, Andrea, Cimorelli, Luigi, Cozzolino, Luca, Pianese, Domenico
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Dordrecht Springer Netherlands 01.02.2019
Springer Nature B.V
Schlagworte:
Aeration zone
Atmospheric Sciences
Catchments
Civil Engineering
Computer simulation
Depth
Earth and Environmental Science
Earth Sciences
Environment
Flooding
Geology
Geotechnical Engineering & Applied Earth Sciences
Groundwater
Groundwater levels
Groundwater recharge
Heterogeneity
Hydraulics
Hydrogeology
Hydrologic cycle
Hydrological cycle
Hydrology
Hydrology/Water Resources
Infiltration
Infiltration rate
infrastructure
Mathematical models
Runoff
saturated conditions
Soil
Soil analysis
soil heterogeneity
Soil layers
Stormwater
Stormwater management
Tables
uncertainty
Urban catchments
Urban runoff
Urbanization
Water management
Water quality
Water table
Watersheds
Low impact development (LID) practices
Stormwater infiltration facilities
Unsaturated zone
Geological heterogeneity
Numerical modelling
Groundwater table depth
ISSN:0920-4741, 1573-1650
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Zusammenfassung:Urbanization has led to a substantial change in the hydrological cycle of urban catchments. Increased runoff and urban flooding, decreased direct subsurface infiltration and groundwater recharge, deterioration of water quality are among the major effects of this alteration. To alleviate these effects, Low Impact Development (LID) practices have been frequently adopted for stormwater management. Among LID infrastructures, infiltration facilities are particularly challenging to design and model due to the considerable amount of uncertainties related to the hydrogeological configuration of installation sites. To date, analysis on how soil heterogeneity, groundwater table depth, and thickness of the unsaturated zone affect the hydraulic performance of infiltration facilities are lacking. To address this knowledge gap, a series of numerical experiments under transient variably water saturated conditions were performed for a hypothetical infiltration facility. Numerical simulations showed that i) infiltration rates increase considerably as the initial depth of the groundwater table increases, ii) the contribution of the bottom of the facility to the infiltration of water is generally higher than the sides, iii) the presence of a less conducting soil layer at a short depth from the bottom of the facility reduces infiltration rates dramatically, iv) the complete clogging of the bottom of the facility has a dramatic impact on the hydraulic performance, v) the stochastic heterogeneity of the soil controls the overall stormwater infiltration process through the facility, and the hydraulic performance may largely deviate from the case when heterogeneity is absent.
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ISSN:0920-4741
1573-1650
DOI:10.1007/s11269-018-2172-5