Antonijuan Rull, Josefina

Folch, Arnau

Gualdo Sesma, Olga

Manuel Lázaro, Antonio

Prat Farran, Joana d'Arc

Sardà, Francesc

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INSTRUMENTATION VIEWPOINTSessions111DISPAR: A TOOL TO MODEL BOTTOM TRAWL FISHING GEARS J. Antonijuan(1), J. Prat(1), A. Folch(2), O. Gualdo(2), F. Sardà(3), A. Manuel(2)(1) Departament de Matemàtica Aplicada IV, EPSEVG, Universitat Politècnica de Catalunya. Víctor Balaguer s/n,08800 Vilanova i la Geltrú, Spain(2) SARTI-CT VG, Universitat Politècnica de Catalunya. Rambla Exposició s/n, 08800 Vilanova i la Geltrú, Spain(3) Institut de Ciències del Mar (CMIMA-CSIC), Departament de Recursos Marins Renovables. Passeig Marítim de la Barceloneta, 37-49, 08003 Barcelona, SpainKeywords: Bottom trawl fishing gears, numerical simulation, modelling, softwareDISPAR is a collaboration project between the UPC-CTVG and the CSIC-CMIMA aimed at understanding and  analyzing the behaviour of bottom trawl fi shing gears (PETRI project “Optimización informáti-ca para el diseño, construcción y prueba de artes de pesca de arras-tre” PTR1995-0735-OP). DISPAR includes a simulation module and a user-friendly interface software.  The numerical simulation  provides global information relative to the bottom trawl gear  for at aff ordable costs (these details can be found in the paper “Simulation of bottom trawl fi shing gears. A simplifi ed physical model” by  A. Folch, J. Prat, J. Antonijuan,  A. Manuel, A. Sala and F. Sardà,  accepted for publication at the book of IMAM07 meeting, edited by Taylor and Francis co.). DIS-PAR goes beyond simply simulating fi shing trawl gear and allows the visualization of the eff ects of certain trawl gear characteristics such as warp length, sweep length, weight or dimensions of the otterboards. Relevant outcomes are the horizontal  otterboard opening, the angle of attack, the warp geometry  and the distribution of tensions under diff erent fi shing conditions such  as fi shing depth or towing speed. The simulation module is interfaced in order to facilitate data inputs and visualize the results for the fi nal user.  The user has to follow two steps to complete any one simulation; the fi rst  is to select a trawl gear. The corresponding screens involved in this step are:• Screen to select a net. Currently, it is possible to select from 3 dif-ferent size nets types typical of those used along the Catalan coast (demersal and pelagic).  It is possible to vary the sweep and bridle length  (see Figure 1).• Screen to select a door.  Doors of diff erent types can be chosen from MAPSA SL (www.mapsasl.com). In addition, the user can select the attachment point of the warp at the door and can also add additional weight.• Screen to select general parameter, including towing speed, warp characteristics, sea depth  and seabed type.At the second step  DISPAR simulates the trawl gear and shows these results through the following screens: • Screen with a global 3D confi guration of the trawl gear with dif-ferent perspectives. In addition to this feature, it also has  warning messages.• Screen showing horizontal opening otterboards, the attack angle and distributions of the tensions on diff erent components of the trawl gear (see Figure 2).The end product is a multifunctional aid tool that complements data measurements, helps fi shermen and  is also a useful teaching aid.   Figure 1                  Figure 2M14

DISPAR: a tool to model bottom trawl fishing gears

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