DID YOU KNOW? DTIC has over 3.5 million final reports on DoD funded research, development, test, and evaluation activities available to our registered users. Click

HERE to register or log in.

# Accession Number:

## ADA312186

# Title:

## Hurricane Motion on a Beta Plane in an Asymmetric Balance.

# Descriptive Note:

## Master's thesis,

# Corporate Author:

## AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH

# Report Date:

## 1996-05-31

# Pagination or Media Count:

##
89.0

# Abstract:

## This thesis extends asymmetric balance theory AB to the shallow water beta plane Beta-AB. The physical problem studied is that of vortex motion on a beta plane in the absence of environmental steering flow. To reduce the problem to its essential physics, the mathematical formulation developed is restricted to purely linear dynamics. The linear dynamics precludes wave-wave and wave-mean-flow interactions. Vortices placed in the Beta-AB model correctly develop the wavenumber one asymmetries the beta gyres necessary for vortex self-advection. The vortices move in a northwest direction consistent with their relative strengths. Finite drift speeds are reached in all cases. Both the Beta-AB model and a linear barotropic nondivergent model are used to investigate the existence of a translating normal mode of zero frequency. If such a mode exists, the beta gyres would be expected to remain unchanged in the absence of beta forcing. When the beta forcing is discontinued, the beta gyres axisymmetrize in both models, refuting the normal mode hypothesis.

# Distribution Statement:

## APPROVED FOR PUBLIC RELEASE

#