1. Katie Horton – EPS 109 Final Project

2. Method and Background  Create a 2d array of values to simulate coral growth in the Great Barrier Reef  One live coral attaches to dead coral – sticking probability of dead/alive  2 dimensional matrix with a solid plane across the bottom  The particles will grow with a certain probability and stick to each other, as the calcium carbonate shells of the corals attach  Periodic boundary conditions  Two “dead” corals will not attach  The acidified ocean will result in a higher CO2 concentration, and thus a lower CaCO3 concentration  Unaffected corals grow at a rate of about 1 cm/ year  After organisms die, accumulation and deposition of calcium carbonate (limestone) skeletons – CaCO3  The distance between the new and the adult polyps grow, expanding the coral mass randomly (within reason)  https://www.youtube.com/wat ch?v=j35mHTksN9E https://www.youtube.com/wat ch?v=j35mHTksN9E Attempted:

3. Coral as DLA Instead of allowing for sticking at A(x,y), allow at one position left or right. Takes into account inability to move upwards Greater x direction, < sticking probabilityGreater sticking probability

4. Run my code with: Number of particles and sticking probability 2-dimensional matrix and a y direction buffer Walking probability of the new corals/ particles Periodic Boundary Conditions Sticking probability with 1 of 4 neighbors filled For black and white: erosion factor (will only move left or right with the generated number<0.8 and other 0.2 for up/down, imaging erosion For color coral, higher sticking probability, more full coral (no ocean acidification)