Numerical Modeling - A Comparison of Different Methods for Simulating Bottom Trawls

Abstract

Bottom trawls are fishing systems that are towed behind vessels for the purpose of catching fish and shellfish for commercial and scientific purposes. The dynamic behaviour of a bottom trawl is largely affected by its design, construction, rigging as well as the hydrodynamic and frictional forces experienced while towing along the seabed. Numerical modeling of bottom trawls is essential for understanding and predicting trawl geometry, resistance and downward forces on the seabed under different conditions. Currently, the market offers a number of trawl simulation software packages. Some have powerful features while others provide basic features for numerical modeling and simulation. In this study, we present an objective evaluation of three widely used trawl simulation software packages: DynamiT, SimuTrawl, and Trawl Vision PRO. A detailed overview of each trawl simulation software, as well as an evaluation of their design and simulation capabilities and reliabilities are discussed. This study provides valuable knowledge for fishing companies, trawl designers, net makers, researchers and educators who use numerical modeling methods for simulating bottom trawls