SPILL/BLTM: Main Scenario Editor

• A button menu
• A header with scenario meta data
• Four panels with the different input fields.

The button menu

run	runs the current scenario and shows the results
check	invokes the scenario consistency, completeness and plausibility checker
copy	copies the current scenario as the basis for editing a new one
delete	deletes the current cenario (note: only the owner can delete a scenario)
save	saves (commits) the current scenario and any changes to the data base

Scenario Header

• The name of the scenario;
• A short description in the text field under the name;
• The owner or author of the scenario;
• The last modification date;
• The name of the WRM model scenario this scenario is based on;
• The name of the start node for the spill;
• The location of the scenario (derived from the WRM scenario location).

Input Panels

1. Upper left:   Basic scenario parameters;
2. Upper right: Hydrology (flow);
3. Lower left:   Spill or pollution load;
4. Lower right: River geometry (cross-sections).

Basic scenario Parameters

• Segment length: defines the model area of interest downstream of the source, in km.
• Number of gridpoints: longitudinal discretization or resolution, anything between 20 and 200 will look and perform resonably well.
• Duration of the simulation, in hours (currently restricted to 48 hours to guarantee matching time series of flow data);
• Timestep for the presentation of results, in minutes.
• Water qualitry standard (for the assessment of results);
• Longitudinal dispersion coefficient: Mixing occurs along the length of the river due to the horizontal and vertical gradients of velocity. In addition, irregularities of natural channels The phenomenon is called longitudinal dispersion. The mass balance equation for constant cross-section area, river flow, dispersion, and no other inputs of S expect at the outfall is: where x and t are distance and time, U is the stream velocity, S the substance concentration, K a decay constant, and Ex is the longitudinal dispersion coefficient.

• Pollutant substance (selected from the Aquatic Pollutants data base).

Hydrology (river flow)

1. a time series of flow values (48 hourly data points).
2. a multiplier (applied to each value).

River geometry

1. The overall length of the segment;
2. A set of trapezoidal cross sections.

Spill parameters