Variations of Urban Water Balances Considering Subsurface Sewer Fluxes: A Hydrologic Modeling Study

This is a repository of the simulation results from the study of "Variations of Urban Water Balances Considering Subsurface Sewer Fluxes: A Hydrologic Modeling Study"

Contents of this repository

• Results from 54 simulations where different environmental and structural condition has been varied
• Results from colmation layer mesh convergence study
• Model validation results

Breakdown of "simulation_data_summary.csv" file

This file contains 54 simulation cases where factors such as native soil properties, groundwater table depths, pipe defect sizes and different trench configurations has been tested.

"simulation cases" 1~27 contains data from simulations where 3 different soil types, 3 different groundwater depths and 3 different pipe defects were tested. Trench configuration were kept same in these. Whereas "simulation cases" 28~54 contains data where 3 different trench configuations, 3 different native soils, 3 different water table were tested. In these latter 27 simulations the pipe defect sizes were kept same.

Mapping of fields:

• exfiltration (m2): Represent water leaked from sewer pipe to surrounding soils.
• transpiration (m2): Actual root water uptake from plants.
• evaporation (m2): Evaporated water from surface.
• surface_runoff (m2): Surface runoff generated.
• inflow_and_infiltration (m2): Represents water lost from soil to sewer pipes.
• subsurface_flow (m2): Represents the water flow in the saturation zone out of the model domain.
• native_soil_k (m/day): Hydraulic conductivity of the native soils tested.
• native_soil_type: Textural classifications of native soils tested.
• groundwater_depth (m): Position of groundwater table from surface.
• backfill_k (m/day): Hydraulic conductivity of backfill materials on trench.
• embedment_k (m/day): Hydrualic conductivity of embedment materials around the pipe in trench.
• pipe_defect_width (mm): Represents the width of defects in pipe.
• trench_configurations: Represents different configuration of trench

"trench_configurations":

• T1: T1 refer to the trench setup with uniform granular soils with no separate embedment.
• T2: T2 refers to native soils backfilled on top with granular embedment around the pipe.
• T3: T3 refers to native soils backfilled in the whole trench.

Breakdown of "model_validation_results.csv" file

This file contains fluxes observed through a defect in a pipe from validation model and comparison of them with different analytical and experimental results.

Mapping of fields:

• head (m): Represent the ponding at the surface of the media.
• experiemntal flux (tang et. al., 2017) (m2/sec): Represent the flux observed in experiemental study by Tang et al (2017).
• analytical flux (tang et. al., 2017) (m2/sec): Represent the flux observed in analytical solution by Tang et al (2017).
• analytical flux (yu et. al., 2024) (m2/sec): Represent the flux observed in analytical solution by Yu et al (2024).
• modeleded flux in hydrus 2d (m2/sec): Represent the fluxes observed in our model in Hydrus-2D.
• modeled_in_abaqus (tang et. al., 2017) (m2/sec): Represent the flux observed in numerical fem modeling in ABAQUS by Tang et al (2017).

Breakdown of "mesh_convergence_study.csv" file

This file contains results from mesh convergence study for determining the size of colamtion layer meshes.

Mapping of fields:

• Mesh Size (mm): Represents the size of mesh tried in the colamtion surface in mmm.
• Mesh Size (m): Represents the size of mesh tried in the colamtion surface in mm.
• Leakage Flux (m2/day): Represents the fluxes through the bottom of colamtion layer.