This page displays charts for a series of solutions to the numerical model. Loft times are varied from 4 to 24 minutes, varying droplet Cd to produce a set of bearings which triangulate to the Saginaw Crater. An example of the Google Earth solution set is shown in the graphic below.
Numerical Model Results - deSkewed Trajectories
Numerical Model Results - Predicted Bearings vs Mesured Orientations
Heuristic Tuning of VariablesA sample of results while varying various parameters is shown below to establish the sensitivity of the tuning process to varialble chnages, as seen in the correlation graph. In each case, the 72 dpi jpeg image is linked to a 300 dpi TIFF version. We see the tracking of predicted values to measured values move away, either upward in bearing degrees, or downward. The effect can be ballanced for good fit with sets of variables other than our current calculator default.
The baseline graph uses default settings:
First, we perturb the Average Ground Plane Velocity from the default of 3.0 m/sec to 2.0 m/sec, then up to 4.0 m/sec:
Next, we perturb the Cd value from the default of 0.3, first down to 0.2, then up to 0.4:
Finally, we perturb the Ejecta Density from the default of 2,000 kg/m^3, down to 1500 and then up to 2500: