Deployment of Long-Term Observation System by Means of Jamstec/deep Tow System

Abstract

There are severa.1 cleel) sea plieiioiiiena wliicli slic.)w si)( )ratlic cliaiiges sucli a . ~ t.ra.iisportatioii of sulmiariiie depcmi ts by tlie bottom curreiit, a.ppeara.iice a.iid clisappearance of biological coiiiiiiiuiities depeiidiiig oii 1iydrotheriiia.l activities, sulmiariiie volcanic activities, eart,hquake, etc. It is difficult t,o clc,a.r t,liis sporadic plieiioiiieiia usiiig maiiiicd subiiiersilJle, ROV a n d cleep tow vehicle. Tlierefore, we developed t,wo ltiiids of loiig-teriii tl,serw.t,ion systeiiis t h t put stress oii visual iiiforiiiatioii about deep sea. floor. Oiie was to observe time cliaiige of ripple iiia.rks to iiivestigat,e tra,iisiporta.tioii of the Imttoiii iiitlterials at a deptli of 1975 iiieters. An(hlier wa.s tlo chserve t,iiiie c h i g e of Iiologica.1 coiiiiiiiuiiit ies depending oii liydrotheriiial mtivities a.t a depth of 1070 meters. These observation systeiiis equipped with a deep sea still caiiiera. a.iitl a. strobe, a, curreiit meter, a. CTD seiisor, ail a.coustic tra,iisponder witli relmser aiid ghss splierical I)uc)ys. Iii t.liis rcport.. n'c present, yo11 l i m ~ to iiiniinge tlie longteriii c-)bservaia.tioii systcwis a.iicl soiiie resultss of tlie ol~servat,ioiis.