CHESS DET

CHESS: DET Workflow

Workflow selector: config.workflow = 2 (Deterministic). It replaces the former EVA alias. Main functions: chess_det_formater.m (forcing), Structure_Reponses/Deterministic/chess_det.m (responses).

What question DET answers

DET is a calculator: "what does each storm in the database do to this structure?" Every storm of the requested storm type and datasets is used once, as recorded. There are no replicates, no forcing uncertainty, no sampling and no hazard curves.

Use it to:

• Inspect individual storms (which storms overtop, and by how much).
• Check a PSE before running PROS or LCS.
• Compare Peaks with Timeseries for the same storm.
• Trace a hazard curve value back to the storms behind it.

Pipeline

Step	DET behaviour
Forcing	chess_det_formater.m: every storm once, with its storm ID and time
Uncertainty	Skipped (u_engine = 1); manual uncertainty prompts are skipped and missing values set to 0. Bias prompts are unchanged
Adjustments	As configured: sea level rise, random tides, depth limitation, dry toe (Model Conventions)
Responses	chess_det.m: compute_structure_response.m on the adjusted forcing

Tides. apply_random_tides = 1 is allowed. The start hours drawn for each storm are saved in the config (tide_indx_xc, tide_indx_tc) and shared by the Peaks and Timeseries versions of a storm. Peaks get the tide at the start hour, while Timeseries get the tide series from that hour on, so the tide at the storm peak differs between the two. The Peaks vs Timeseries plot shows this on purpose.

Floodwall responses (P2, P3, Pu, nappe) are computed directly from the equations for each storm. There is no frequency-base step.

Outputs

PSE/<struc_id>/<case_name>/DET/<db>_DET_{config_file,project_forcing,project_responses}.mat (Model Outputs).

Resp.(Peaks|Timeseries).(Default|WLP|WHP).(XC|TC) holds, per storm:

Field	Meaning
storm_id, time, dt	Storm identity and time steps
SWL, Hm0, Tp	Forcing after adjustments; Hm0 is the database value
Hm0_DL	Depth-limited wave height used by the equations
h, Rc	Toe depth SWL − toe_elevation and freeboard crest_elevation − SWL
every computed response	Full history: one value per time step (Peaks have one step)
Max	One value per storm: the maximum of each field independently (Rc uses the minimum)

Plots

From Visualization/det_methods.m via CHESSPlots:

• response_vs_forcing_plot: any response against any forcing, coloured by a third field.
• response_table: a pop-out table of every storm's values.
• peaks_vs_timeseries_plot: the same response from Peaks and from Timeseries, storm by storm.

See Visualization for examples.

Inputs

DET reads the same input file as PROS. The pros_*, mcs_* and csr_* fields are ignored. See config_reference.