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A long-term suspended solids runoff simulation in a highway drainage system.
R K Aryal1, H K P K Jinadasa, H Furumai
1Department of Urban Engineering, School of Engineering, University of Tokyo 7-3-1 Hongo, Bunkyo-ku, 113-8656 Tokyo, Japan. aryal@env.t.u-tokyo.ac.jp
Summary
Simulating highway runoff requires accounting for regenerated depression loss during intermittent rainfall. Accurate sediment load prediction depends on considering both surface and pipe sediment initial conditions for effective stormwater management.
Area of Science:
- Environmental Engineering
- Hydrology
- Water Resource Management
Background:
- Highway drainage systems are critical for managing stormwater runoff.
- Understanding sediment transport (SS) in these systems is essential for water quality protection.
- Previous models sometimes struggled with intermittent rainfall and sediment load accuracy.
Purpose of the Study:
- To investigate the runoff behavior and sediment load from a highway drainage system.
- To improve the accuracy of hydrological and water quality simulations for highway runoff.
- To assess the impact of initial sediment conditions on simulation outcomes.
Main Methods:
- Conducted long-term monitoring in a Swiss highway drainage system.
- Utilized the distributed model 'InfoWorks-CS' for quantity and quality simulations.
- Incorporated serial rainfall monitoring data and adjusted for regenerated depression loss.
- Performed long-term simulations to establish initial sediment conditions.
Main Results:
- Quantity simulations accurately matched measured hydrographs under continuous rainfall.
- Overestimation of peak flow in intermittent rainfall was reduced by considering regenerated depression loss.
- Single-event simulations underestimated SS load in light rainfall, highlighting the importance of initial sediment conditions.
- Long-term simulations establishing initial surface and pipe sediment conditions improved pollutograph accuracy.
Conclusions:
- Regenerated depression loss is crucial for accurate runoff simulation during intermittent rainfall events.
- Appropriate initial conditions for both surface and pipe sediment are essential for reliable SS load prediction.
- Accurate modeling of highway runoff and sediment transport requires a holistic approach considering dynamic hydrological processes and sediment dynamics.