Matlab Scripts for constructing Lagrangian Trajectories in HOPS

Below are links to Matlab scripts for computing trajectories from the Harvard Ocean Model data for the California Current including Monterey Bay.
To start, download the files which include:
  1. HOPS.mat Matlab save file containing variables in arrays u and v, and the matlab structure hops holding grid point and discretization and coast line information.

  2. mb_example.m Matlab script which runs an example computing 8 trajectories in and around Monterey Bay.

  3. trajectories.m Matlab function wrapper for ODE45 or ODE15 calling archive_path.m which is the actual matlab ODE function to compute the RHS of odes from gridded velocity data.

  4. archive_path.m See above.

To begin, download the 4 files into a directory and launch MatLab. To run the example script, first load the velocity and grid data and then simply execute the script mb_example: 
>> load HOPS
>> mb_example
The result should be a sequence of images showing the current trajectories (8) and the underlying, time-dependent vector field.
Please give this a try and let me know if there are problems/questions.
SOME MOVIES TO LOOK AT:

  1. Exit_Time_1.mov
  2. FTLE_1.mov
  3. Exit_Time_Hourly.mov
  4. Exit_Time_Hourly_wTraj.mov
  5. Etimes_Control_Nominal.jpg Comparison of Exitimes along Nominal and Control Trajectory.

MOVIES at Day 6 start:

  1. Exit_Day6.mov
  2. FTLE_Day6.mov

MOVIES at Day 1 with Control Trajectory:

  1. Exit_Day1_wtraj_HiRes.mov
  2. Exit_Day1_ZOOM.mov

MOVIES at Day 5 (t = 121) with Control Trajectories:

  1. Exit_Day5_wtrajs.mov
  2. Traj3_Input_Etime.jpg
  3. Exit_Day5_New.mov With new Blane data for trajectory 3 ...
  4. CompP1P3_Input_Etime.jpg With new trajectory 3 ... note trajectory 1 leaves control region.



File translated from TEX by TTH, version 3.44.
On 8 Sep 2008, 13:44.