MT Marine Field Experiment Data Operation

8/17/2019 MT Marine Field Experiment Data Operation

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/he geologial i$for#atio$ of oastal areas is i#orta$t bea"se of the high

o$e$tratio$ of eo$o#i a$d soial atiities i$ these areas& $ additio$ oastal areas hae

bee$ o$sidered as a$didate reository sites of highleel radioatie aste (+6) (e&g& the

$"lear aste reated by the reroessi$g of se$t f"el)& /he hydrology of oastal areas a$d

related gro"$dater syste#s has bee$ i$estigated e8te$siely for e8a#le offshore of !e

9ersey!orth A#eria a$d offshore of :"ri$a# :o"th A#eria &

$ additio$ to these f"$da#e$tal st"dies geosie$tifi i$estigatio$s hih

sea#lessly i#age s"bs"rfae str"t"re fro# la$d to sea are i#orta$t i$ order to larify the

e$tire hydrologial syste# be$eath a oastal area that i$oles both o$shore a$d offshore

regio$s& (fig 1) $ 9aa$ has do$e a lot of deelo#e$t a$d researh to dra a geologial

str"t"re a$d hydrology i$ the oastal areas&e hae do$e researh o$ geohysial #ethodsto

eal"ate the geologial str"t"re of the la$d to sea "$der a $"lear aste reository researh

ro;et f"$ded by the Deart#e$t


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%a of +okkaido sla$d a$d loatio$ of the st"dy area&

/he diffi"lties of


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s"ly the digital #od"le a$d fo"r AAell (1&5@) batteries (total> *@) s"ort the a$alog

lter "$it& o"r @ batteries are o$$eted i$ arallel to s"ly eletri oer to the a$alog

a#lier of the #ag$eti se$sor& /he syste# s"orts at least 72 h of data aq"isitio$&

ig& 4& .la$ ie of the $e


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2.2 Field Operations

:"rey %/ i$ offshore a$d o$shore has a differe$t oeratio$ field& $ offshore

to sets of reeier i$l"des to a$hors a$d a b"oy tied to a roe sho i$ fig"re are loaded

o$to the s"rey boat for eah #eas"re#e$t oeratio$& Before loadi$g to the boat data

aq"isitio$ is started by se$di$g a t"r$o$ sig$al thro"gh the o$trol o#"ter& G.: hae to

i#orta$t role& G.: for Clok sy$hro$i-atio$ a$d /he #eas"re#e$t oi$t a$d the s"rey

boat ositio$&

At the #eas"r#e$t Reeier deloyed o$ baseboard& $ order to fi8 the %/

reeier o$ the seafloor the baseboard a$d to a$hors are o$$eted to a 100# roe (ig&

*b) that has a isible #arker flag o$ the sealeel e$d (ig& *f)& /his roe is also "sed to

retriee the a$hors a$d the %/ reeier "si$g a i$h& $ the seafloor the %/ reeier

#eas"res the eletri a$d #ag$eti fields a$d stores the# i$ flash ard#e#ory& rie$tatio$

a$d the #otio$ has reorded by o#ass& After three days aq"isitio$ data has stoed /he

boat ith e#ty dek ret"r$ to the oi$t deloy#e$t oi$t a$d reoers the eq"i#e$ts& /he

reoers of the eq"i#e$t is si#ly erfor#ed by reersi$g the deloy#e$t oeratio$s&

3.1 Study area

$ this aer they hae o$d"ted field e8eri#e$ts o$


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$ this area te sea deth is shalloer tha$ *0# ee$ at a dista$e of 10k# fro#

shoreli$e ith gradie$t of 1H1000& /herefore this area is s"itable as a test site for offshore

eryshalloater #t s"reys "si$g the $ely deeloed %/ #eas"res#e$t syste#&

3.2. Field experiment

/his obseratio$s is o$d"ted to eal"ate the erfor#a$e of the roosed %/

reeier& /he data aq"isitio$ is o$d"ted at 24 #eas"re#e$t sites (%A0%A11 %B0

%B11) alig$ed at aro8i#ately 1000# i$terals alo$g to arallel s"rey li$es (6i$es A

a$d B) eah of hih is aro8i#ately 12k# lo$g& e set to arallel s"rey li$es that are

alig$ed aro8i#ately ere$di"lar to the shoreli$e i$ order to o$fir# the to

di#e$sio$ality of geologial for#atio$ bea"se the geologi setti$g i$diates that the oastal

lai$ has a$ al#ost 2D geologi str"t"re ith a $ortheastso"thest orie$tatio$& /he sea

deths at sites %A0 a$d %B0 $earest the shoreli$e are aro8i#ately 4 # a$d those of

%A7 a$d %B7 are aro8i#ately 45 #& Bea"se of oor eather o$ditio$s e reoered

the


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ig& 7& %a of ario"s geohysial s"reys i$l"di$g #ari$e %/ la$d %/ (s#all hite dots ith gray

edges) la$d seis#i (dashed li$e) 2D %/ i$ersio$ li$e (solid li$e) a$d DD1 drilli$g loatio$ (star) i$ the+oro$obe oastal area&

3.3. Data processing

At all s"rey sites e #eas"red the $at"ral


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sea ae #otio$& /his is bea"se re#ote refere$i$g is $ot able to eli#i$ate loal $oise

o#letely b"t a$ red"e $oise& or better q"ality data i$l"di$g 0&1 to 1 +- at shallo

ater sites lo$gti#e data aq"isitio$ a$d al# eather o$ditio$s are i#orta$t as is the

ase ith o$shore %/ #eas"re#e$t&

Table 2 Seafloor T station and sea dept!.

Data i$ersio$ a$d i$terretatio$

$ additio$ to the #eas"re#e$ts of #ari$e %/ as o$d"ted to obtai$ data %/

gro"$d #eas"re#e$t sites (1101112 statio$s alo$g the li$e (a) a$d 12011230 alo$g the

li$e B) alig$ed i$ i$terals of abo"t 500 #eters alo$g to arallel sa$ (li$es A a$d B i$ig"re 7) hih o$$ets the seafloor s"rey #etri to$s li$es&

Aordi$g to reio"s res"lts of geologial a$d geohysial for this regio$ of the

st"dies (for e8a#le A#o et al& 2007 the /okia et al& 2013) geologial for#atio$ has

eer after a$d to i$ the $ortheast a$d so"thest a$d that is ere$di"lar to the beah&

Also arallel to the to di#e$sio$s are set to hae sa$ li$es o$shore a$d offshore %/& /he$

"si$g all data o$shore a$d offshore %/ at o$e ti#e e had a 2D heart of the /


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heredobs is a set of obsered data # is a etor of "$k$o$ #odel ara#eters is

a $o$li$ear forard #odeli$g f"$tio$ ith reset to a seifi resistiity distrib"tio$ is

a diago$al eighti$g #atri8t is the oerator 6alaia$ #atri8 to al"late hat the

ro"gh$ess ara#eter settle#e$t or sas& A$d ara#eter I t deter#i$es the relatie

i#orta$e of the goal of the f"$tio$ here the first a$d seo$d i$ the right side of the

eq"atio$& (1)& Areiatio$ f # dee$ds o$ the al"e I& @al"e is #ore aroriate tha$ I

Deter#i$ed "si$g e#irial Bayesia$ #ethod hih is i$ AkaikeBayesia$ i$for#atio$

riterio$ (ABC) li#it (for e8a#le %its"hata 2004J %its"hata et al& 2002)& A$d "t /


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+oro$obe oastal areas based o$ geohysial i$estigatio$ e are o$siste$t ith

their #odel& f"rtheri$estigatio$ s"h as offshore i$q"iries a$d i$estigatio$s seis#i

drilli$g is $eessary i$ ordered to o$fir# the geologial a$d hydrologial str"t"re

beloseabed&

"O#"$%SIO#

e hae deeloed a $e #ari$e %/ #eas"re#e$t syste# that a$ be alied to

#eas"re#e$t i$ a shallo seaater area s"h as oastal regio$s& /he diffi"lties of


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drilli$g to be a fresh ater layer e8te$ds to a dista$e of seeral kilo#eters "$der the sea&

/he res"lts of the rese$t st"dy i$diate that the roosed #ari$e %/ syste# a$ be "sed to

larify brakishHfresh gro"$dater distrib"tio$s a$d str"t"res i$ oastal areas for the "rose

of +6 site eal"atio$&

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