Accession Number : AD0704132

Title :   A COMPUTER SIMULATION OF NATURAL PATTERN GENERATION PROCESSES.

Descriptive Note : Final scientific rept. 30 Jun 67-31 Oct 69,

Corporate Author : HEBREW UNIV JERUSALEM (ISRAEL) DEPT OF BOTANY

Personal Author(s) : Cohen,Dan

Report Date : 30 NOV 1969

Pagination or Media Count : 47

Abstract : Models of some natural pattern generating processes have been tested by computer simulation. The following models have been simulated with some degree of success. The generation of the pattern of the boundary of a growing mass of cells. Smooth or lobed patterns have been generated by purely local interactions between the cells at the boundary. The generation of drainage patterns on initially smooth surfaces. The only assumption in the model is that the rate of soil erosion is the product of some power of the local water velocity and an erodobility factor which varies randomly. The simulation could reproduce fairly well river competition and capture, and the effects of the slope and the soil heterogeneity on the drainage pattern, which occur naturally. The growth and development of the patterns as effected by mutual shading. There are positive feedback relations between the growth rates of adjacent branches and plants when the rate of elongation increases monotonically with light intensity. This causes a dominance of lighted branches over shaded branches. When the rate of elongation decreases as a function of light intensity over some range, the growth rates of adjacent branches tend to be the same, and they form a smooth level boundary. (Author)

Descriptors :   (*PATTERN RECOGNITION, MATHEMATICAL MODELS), CELLS(BIOLOGY), PLANTS(BOTANY), SIMULATION, SOILS, DRAINAGE, EROSION, BIONICS, COMPUTER PROGRAMMING

Subject Categories : Bionics

Distribution Statement : APPROVED FOR PUBLIC RELEASE