How to Implement a Sequential Simulation for Event-Based Modeling using Warm-Up Period?

[zaishang gu]

Dear SWAT user,I am attempting to set up an event-based rainfall-runoff simulation using SWAT2012. My goal is to simulate specific storm events accurately.My challenge is that I do not have long-term continuous hourly rainfall data to run a standard continuous simulation with a warm-up period. However, I do have sufficient long-term daily data.My proposed strategy is as follows:

1. Warm-up Simulation: Run a long-term daily simulation to establish realistic initial conditions (soil moisture, groundwater levels, etc.). This simulation would use my available daily weather data.
2. Save State: Save the final state of this warm-up run to an initial conditions file.
3. Event Simulation: Start a new, separate event-scale simulation (using hourly data for the storm event) by reading the initial conditions from the file generated in step 2.

I believe this approach would provide a more physically realistic starting point for my event simulation compared to using default initial conditions.My specific questions are:

1. Is this sequential method supported in SWAT? If so, how do I implement it? Specifically:
2. • How do I instruct SWAT to write the initial condition file at the end of the warm-up (daily) simulation?
   • How do I then tell the event-scale (hourly) simulation to read from that initial condition file at the start?
   • In which menus or input files are these settings located?

Thank you in advance for your time and expertise.Best regards,Guzaishang

[Omid Mohammadi]

Hi Zaishang,

We modified SWAT to print and get all required state variables as the initial conditions. Here are the papers:

https://www.sciencedirect.com/science/article/pii/S002216942200587X

https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2022WR032397

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