Accession Number:

ADA634984

Title:

Particle-Lattice and Automaton Model of Bioturbation

Descriptive Note:

Corporate Author:

DALHOUSIE UNIV HALIFAX (NOVA SCOTIA) DEPT OF OCEANOGRAPHY

Personal Author(s):

Report Date:

1999-09-30

Pagination or Media Count:

6.0

Abstract:

LONG-TERM GOALS. My long term goal is to help the quantitative understanding of the relationship between infaunal behavior and consequent sediment modifications, and their effects on acoustic propagation in marine sediments. I hope to supply information on this relationship to the acousticians in our group i.e. Darrel Jackson and co-workers for incorporation in their forward andor backward acoustical models. OBJECTIVES. The objective is to create a mechanistic mathematical model of animal-sediment interactions. Current models that are based on biodiffusion, nonlocal mixing, etc. cannot easily simulate, for example, animal-produced density heterogeneities, which affect acoustics, as they are essentially all dissipative processes, i.e. smooth out , rather than generate heterogeneities. My new model is capable of generating sediment heterogeneities. APPROACH. My approach is the direct modelling of organism-sediment interactions via a new type of model. Biologically active sediment is represented on a computer as a regular lattice of quasi-particles with individually assigned chemical, biological or physical properties. Model benthic organisms are introduced in the form of automatons, i.e. programmable entities, that are capable of moving through the particle lattice by displacing or ingesting-defecating particles. Each automaton obeys a set of rules, both deterministic and stochastic, designed to mimic real organism behavior, and different types of organisms have different sets of rules. The computer coding of the model is being done by a PDF, i.e. Frederique Francois March to August and Jae Choi since August. The code is in FORTRAN 90 with user interface and automated graphical raster output see below for examples. A current version of the code can be viewed at ftpmudchem.ocean.dal.caONR.

Subject Categories:

  • Biological Oceanography
  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE