s e c . i - arlis.org · received may 29 \984 'ain>ka po~er au1l\ori"ly alaska...
TRANSCRIPT
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D
s~ s '3'e"C . I
.' .' .' .
DRAFT
ALASKA DEPARTMENT OF FISH AND GAMESUSIT NA HYDRO AOUATI C STUDIES
HEPOAT NO . 3 PART II . Chaptet'" 1aAQUATIC HABIl'AT AND IHSTAE"M FLO WINVESTIGATIONS ( MA Y-OCTOBER \88 3 )
ALASKA DEPARTMENT OF FISH AND GAMESUSITNA HYDRO AOUATIC STUDIES REPORT SERIES
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RECE IVED
MAY 29 \984
'AIN>KA pO~ER AU1l\ORI"lY
ALASKA DEPARTMENT OF FISH AND GAMESUS ITN A H't'D RQ AQU ATI C STUD IE S
REPORT NO.3 PART II . Chapter 10AQ UATIC H AB IT AT AND IN STREAM FLO W
INVEST IGATIONS (M AY-OC T OB ER 198 3 )
Edit ed b y:
Chr lat oDhll f C . e st ••
•••Dougl a s S. V inc ent-La ng
Preo. red lor:
ALASKA POW ER PO W ER AUTHORITY33" W. FIFTH AVE.ANCHORAGE, ALASKA 9950 1
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DRAFT May 4, 1984
EVALUATIONS OF THE EFFECTI VE NESS OF APPLYING INFRARED TH ERMAL IMAG ERY
TECHNIOUES TO DETECT UPWELL ING GROUNDWATER
1984 Repor t No.3 . Chapter 10
8y:
Gene Sandone
and
Christopher Estes
Alaska Department of Fi sh and Game
Susi t na Hydro Aqua t ic Stud ies
2207 Spenard Road
Anchorage . Alaska 99503
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DRAFT May 4, 1984
•
ABSTRACT
Three infrared heat sensing devices (Hughes Probeye . Xedar Pyroscan. and
AGA Thennovi s ion ) were tes ted to eval uat e their fe as ib il ity as remote
sens i ng devices for locati ng and quant ifying t he sur f ace area of Susitna
River s l ough habi t at influ enced by groundwater upwel l ing.
Studies by the Alaska Department of Fi sh and Game Susitna Hydroelec tr i c
Aquati c St udt es Team suggest tha t upwe11i og groundwate r is one of the
pr i nci pal variabl es i nf luenci ng t he suitability of habi t at for spawn i ng
by chum salmon i n sloughs and si de channels .
Thi s pi lot evaluat ion in di cates that the appl icatian of remot e sens ing
for locati ng upwelli ng is cont ingent upon t he envi ronmental condi t ions .
1eve1 of deta i1 des ired , and t he equi pment util i zed. Of the t hree
thenna1 i nf r a r ed imagers evaluated , the AGA thennovis ion proved to be
the overa11 best su f t ed imager for df scernf n9 upee 111n9 groundwa ter
areas with in th e sampled sloughs of the Susi tna River.
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DRAFT
GLOSSARY
May 4 , 1984
•
Emiss itiv ity - t he rat io of actual energy of therma l radiat ion emitted
f rom an object to th e actual energy of thermal radiat ion emitted
from a bl ack-box radiator at the same temperature.
G l o~ Tube - a vie~ing screen, i. e. cat hode ray tube .
Ground-Truthing - t he process of determi ning actual measurements of
variable on the ground.
Imager - an el ectronic device whi ch is sensit i ve to emi tted t hermal
inf rared radiation and produces and electric s i gnal proporti ona l to
the incident i nf rared radiation received .
Infrared Radi at ion - elec tromagnetic rad iation just beyond t he red end
of the visi bl e spect rum which i s rad iated from all objects whose
temperature ; s above absolute zer o.
~m - a mi l lionth of a meter .
Thennal Infrared Imagery · the process by whi ch t aermal images are
obtained through the use of t hennal i nf r ar ed sensor s
(imagers); the to ne of the image or picture is directl y
re l ated to the i nf rar ed ra dia tion emitted f rom t he obj ec t
imaged .
i i I
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DRAFT
TABLE OF CONTENTS
May 4, 1934
ABSTRACT •• •• •••••••• • • • • • • • ••• •• • • • •• • • • • •• •• ••• ••• • • • ••• • • • • •• • •
GLOSSARY • ••• •••••• •• • • •• • • • • • • • •• • • • • ••• • •• • • • • • • • • • • • • • • • • • • • •••
TABLE OF CONTENTS .
LIST OF FIGURES .
LIST OF TABLES .
LIST OF PLATES .
\. 0 INTRODUCTION • • • •• •• •• • • • • •• •• • • • • • • • •• • • •••• •• •• •• •• ••• • •• ••
2.0 METHODS .2.1 Site Select ion ..2.2 Field Data Coll ect io n .2.3 Analytical Approach .
3. 0 RESULTS .
4. 0 DISCUSSiON .
5.0 CONTRIBUTORS .
6.0 ACKNOWLEDG EM ENTS .
7.0 LITERATURE CITED .
i i i
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Iv
Figure Page
10-1 Inf rared por t ion of t he el ectromagneticspect rum•.• . . . . . . . . . . . . . . . . . . . ..• .• . . . . . . . . . . . . . . ... . . .
May 4. 19B4
- ---- - --- -~~-~~~-----~----~
10- 2 Inf rar ed t hermal image ry s t udy s i t es ....... . . . • • . • . . . . .
10- 3 Isot hermal map of a port ion of Sl ough 9A developedfrom ground- t ruthi ng data col lected Nov. 17, 1983.Co rresponding t herma l scan in Plate 10-2•• . . . . .. . . • • ...
10-4 Isothermal map of a portion of Slough 9A developedfrom ground-trut hi ng data col lect ed Nov. 17. 1983 .Cor r es pondi ng t he rmal scan i n Plate 10-3 . . . ... .. . . . . . • .
10-5 Isotherma l map of a port io n of Slough 9A devel opedfrom ground- truthing data col l ect ed Nov. 17. 1983 .Cor res pondi ng t hermal scan in Plate 10-4 .
LIST OF FIGUR ES
DRAFT
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J
I
DRAFT
LIST OF TABLES
Table
May 4, 1984
I
..
10-1
10-2
Technica l specif i cat ions of the thermal imagerstested .
Ete l d testi ng condit i ons and locat ions .
v
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DRAFT
LIST OF PLATES
May 4, 1984
Plate
10-1
10-2
10-3
10-4
Aer ial photo of Sl ough 9A (November IS. 1983) . Thermalscans of outlined areas are presented in Plates 10- 2through 10-4 as indicated .. ..•• ••• • . . ... ••• •• . . • • . . . . . .
Thermal scan of a portion of Slough 9A (see Plate10-1), November IS. 1983 .
Thermal scan of a portion of Slough 9A (see Plate10-1), November 15. 1983• . .• •••• . .•••• • • • • • . . • • • .• .••••• . .• •••
Therma l scan of a portion of Slough 9A (see Plate 110-1). November 15. 1983•• • • ••••• • •... • • • •• ••.... ••• • • • •..... •
vi
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DRAFT May 4, 1984
1.0 INTRODUCTION
This chapt e r presents an evaluati on of t herma l i nf r a r ed i magery for
locating upwelling groundwaters in selected sloughs of the Susf t na
River . The specific objectives of the study are :
1) t o determine if upwel l ing groundwaters i n selected side
s lo ughs of the Sus itna Ri ver can be detected us ing thermal
i nfrared imagers ; and
2) to evaluate the abil ity of different thennal i nf r ared imager s
to detect upwell i ng groundwa ters in the 5i de 51ouqhs of the
Sus itna River .
Upwell ing groundwater i s a pr inc ipe l variatle influenci ng the
suitability of habitat for spawning by chum sa lmon i n the Talkeetna to
Dev i l Canyon reach of the Sus i t na River system (ADF&G 1983; Chapt e r 7) .
Other investigators have also as soc iated chum sa l mon spawn; ng habi tat
with upwelling groundwater elsewhere i n Alaska ( Kogl 1965, Francisco
1977 , Wilson et a1. 1981) .
Preliminary evaluations of the upwelling groundwater areas i n the
se1ected sloughs of the Sus i tna Ri ver were conducted by on-the-ground
vi sua l inspect ions of s louqh s ubs tra t e (ADF&G 1983 : Appendi x C).
Upwellin9 groundwater wa s de tected by observing the movement of smal l
streambed particles as the groundwater was vent ed from the streambed.
Oftentimes, the vent ed groundwa ter wa s expelled under pressu re so that,
in re l a t i ve ly shallow water , a di stu rbance was visible at the sur f ace .
10· ,
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10- ?
Success of detect ing upwel l ing groundwa t er vents i n Sus itna River
s :oughs vari ed with the part ic le s ize of the streambed subst rate. Vents
were easily discernible in si lt and sand streambed substrates but we re
difficul t to detect when larger streambed substrate particle sizes
predominated. This information is required to support studies to model
the availabil ity of spawni ng hab itat in sloughs as a funct ion of flow .
Therefore, a means of improvi ng the dat a base was desired.
Infrared radiation is created by atomic or molecular energy and is
radiated from all matter (Shi e l ds 1977) . Thermal i nf r ar ed imagery use s
e lectronic devices ( i ma ger s) wh i ch are sens itive to emitted i nf r ared
radiation . The imager s conver t t he r adi ant energy received to an
electrical signal which t s amp lifi ed and either reco~ded on magnet i c
tape or , transmitted to a glow tube . Si gna l strength determines t he
brightness to which an area appears on the vi ewi ng screen . The
resul t i ng gray t ones rep resen t t he thermal em~ss ions of the object
(Robinove and Anderson 1969 ) .
May 4 . 1984DRAFT
Infrared therma l imagery was consi dered as a possible tool for improv ing
the upwelli ng data base. This assumpt ion was based on re cent
applicat ions of thermal infrared imagery as a tool to detect synoptic
surface water temperatures over a large area. These applications have
allowed hydrologists to i denti fy numerous hydrologic phenomena such as
natura l dispersion and circulat ion patterns (Whi ppl e 1972) , disper sion
of heated effluent (Whipple 1972; Pluhowski 1972) , dispersion of sewage
outfa ll, i ce cover (Pl uhowski 1972) and grou nd wate r di scharge int o
large bodies of water (Robinove 1965; Pluhowski 1972 : Boettcher et al ,
1976; Boettcher and Haral ick 1977).
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The amount of i nfrared r adi a ti on emitted from a body depends upon t he
emis s iv ity of t he obj ect , tha t i s. i t s ratio of actua l ener gy rad ia t ed
from the body to t he maximum pos s ib le energy ra diated from a bleck- box
radia tor at a given t emperature ( Pl uhows ki 1977 ) . The emis si vi t y nf
water rega rd less of i ts temperature and concentrati on of di sso lved
solids i s estimated to be 0.97 (Anderson 1954 ) . Therefore. di fferenc es
i n the amount of i nf rared radiation emitted at vari ous places f rom a
water body are directly rel at ed to differences i n th e surface wat.e r
temperature (Robinave 1965) . Infrared imagery only detects enet-qy
ra diated f r om the surfa ce of a body of wate r . Therma l rad iati on be low
the surface cannot be detected (Boettche r et . a1 . 1976) .
The full infrared electromagnetic spectrum (Figure 10-I) ranges from 0. 7
to 300 urn. This range can be fur t her broken down to i ncl ude ref lected
i nf r ar ed radiation (f rom 0. 7 - 3 um ) and emissive or thenna1 i nfre r-ed
r adi at i on (3.0 urn - 14. 0 urn ) . Infr ared photo graphy operates in the
re flected reg ion f rom 0. 7 to 0. 9 urn . Water vapor. carbon di oxidf.,
ozcne , and particulates in t he atmosphere attenuates t he amount of
i nf r ar ed energy received by ebsor pt t on or sca tteri ng. There exi s t s
areas or "windows" in t he spec trum however. where attenuation h
mi nimized (Figure 10- I) . These "\Ii' i ndows" ."h ich occur i n the reg i ons of
3 to 5 m and 8 to 13 m are used by infrared imagers (P1uhowsk.i 1972).
Syst ems wh l ch operate i n t he 8 to 13 um reg ion of t he spectrum are best
su ited for deta i led t errai n analyses because natura l earth emis s io ns
occur of i nf rared r adi at io n wi thin th i s region (She il d 1977) . St nee
i nfrared ra diation occurs i n the abse nce af light . detec t; ng operat ;ons
i n th i s spec t r tm region can be performed day or nig ht. Imagers
DRAFT MdY 4, 1984
10- 3
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uv
ATTENUATIONWINDOW S
I
.7
1
VISI BLE
SOLAR·IR
IN EA R.IRJ
0'1-- - ...,
THERMA L-I R
[nfrare d port ion of the electromagneti c spec trum .
,~-, • • T1
• ••• Ts h•• ·c
. ·.US 'S Cl"'TI
"" : · .·.. 00 ..."
., ..:Y2t:+~~!-. ,~_, ..:;.tl: ..-
/D~?::,~~;;·~:,...
t··,..".,' ".,.- :; .."••
MIC~ONS IMICROMETER}
INFRARED PQRTIDN OF ELECTROMAGNETIC SPECTRUM
FAR ·I R
Figure 10-1
.....f · "'lfi'l'M ' ·lI[:::vt"'Cl ilt " : .1
." l HCS-: ,lC... S ,0"
., l"'C;S-:""" S ,0"
."C; S'aGMS '0'1ac 10 1<C;S:lI.:;:loI.$ '0",eo U; ::;S 'l'~ = " S .c'o.. M I~llC l'l" ,c'
''';!'IC'''' '0'
" "'';:ll(;.t; . '0'
'00 " . CiIIO:;, ,c'0.' ,. ,."
,. '0''0 ,. ,.'
" (":'!:-'l, :cJ
,. "[7!: iII, '.><0 .. (.[iIIS
L.. ---'I LI ...11LI _
MICROWAVE
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10- 5
operat i ng in the 3 to 5 urn region provide excellent discrimination at
the sacrifi ce of background detail, but solar ... ref l ec ted energy can
i nterfere with t he images on bright, sunny days . General ly, as sys tems
move into the longer wave length portions of the spectrum (earth
temperatures) sophi st icat ion and price increase, performance and resol u...
ti on i s i mproved , and versatil ity i s gai ned (Shi e l ds 1977) .
Boettcher et . e t • (\976) and Boettcher and Har-a l i ck (1977) i n their
groundwater in vestigations us ing thermal infrared imagery. quantified
surf ace water infrared radiat ion. With t he aid of computer tec hniques,
the i nf rared was transformed i nt o a spatial-temperature map having an
isotherm spacing of 0.5°C. This computer generated isothermal map
allowed the invest i gators to pin -po int surface water temperat ure
i nfl uenced groundwater i nfl ows , and to detect circulation and di spers i on
patterns of the ground water i nt o the larger body of water at the
surface . The technique of using thermal i magery for detect ing ground
wat er i nfl ows may prov ide a quick, sens it ive and accurate method to
detect areas of upwell ing groundwater vent ing i nt o the s l oughs of t he
Sus i t na River system.
May 4 , 1984DRAFT
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rf\Gf ID-G Doe.S NrJ-' E X tSI
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2.2 Field Oata Col l ecti on
10· 1-
Sloughs with known major upwelli ng groundwater areas wi thin the
Talkeetna to Dev il Canyon reach of the Sus t tna River were selected for
this pilot study ( Fi gur e 10-2). Specifically , sloughs 9A, 10 and 11
were chosen as study sites for th is investigation. On one occas ion
Slough SA was used as a study site because of i ts proximi ty to base camp
and easily detected upwelling ground water vents .
May 4, 1984
2.1 Site Se lection
2. 0 METHODS
DRAFT
Three infrared t herma l imagers . a Hughes Probeye. Xedar Pyroscan and AGA
Thermovision 750. were tested t o evaluate the ir capabilities as remote
sensing devices for locating the surface water areas of selected s l oug~
habitats i nf luenced by upwelling groundwater. The AGA Thermovision 750
and the Xedar Pyroscan units are infrared camera systems capable of
bei ng i nt er faced with vi deo recordi ng equipment. The Hughes Probeye is
an infrared imager which presents a th ermal picture in the observers
eyepiece. The Hughes Probeye does not have record ing capabilities .
Only t he AGA Thermov ision 750 can magnify the thermogram by the use of
i nterchangeable ceee-e lenses havi ng different foca 1 lengths . Camera
lenses are f i xed in the other two systems. All systems are portable and
l i ght wei ght and can be operated by one person. Because of the
magnif ication capabilities of the AGA Thenmnvis i on 750. this system must
be operat ed f rom a stable platform to i nsure camera stabil ity . Table
10-1 su~rizes the technica l spec ifications of each system.
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CANYON
' 0,
0 "
MILES
o
Infrared thermal imagery stu dy si tes .
'--SLOUGH II
~~ SLOUGH 9A
~p. I'-\~~,\~ ( SLOUGH SA
,j" C •
; .'Cd
'=:::-',MAP AREA
'f
Fi gure 10- 2
..,
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Tabl e 10-1. Techn ical specifications of the thermal Imagers evaluated.
lenl fOCAl Ohph)'S)'It.. Spec t r.1 Re gion Relol ut lon Length T,pe Support Weight How u.ed
AGA fh.r~v l l' on 2 .5 -5 u- 0 .2 · C . ~.lDO _
CRT or Bett.r)' P. ck . nd 21 l bl . portebl e3D· C Video l tqutd Nltrog.n ' or
coolln9
Hughel Pr Obe)'e 1-5 .0\ u- 0 .1 · C .t lO_ 60 lIn. e.tt.r)'. Bottled 7 lbl . h.nd~ope'.ted
22· C LED dhph)' Argon fo r codtng
Xed. , Pyrol c.n 8-10\ u. 0.2 · C ,, - ~Z5 Hn. B.ttery 10 Ibl . h.nd-operetedotT video Icnen
or vIdeo
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The Hughes Probeye and the Xedar Pyroscan were evaluated and compared on
August a, 1983 . These evaluations were conducted during bright dayl i ght
conditions and under a high ma instem di scharge of 26,000 cfs . Inf rared
sc ans of known upwell i ng groundwater areas i n Slo ugh SA and Sl ough 11
were conducted f rom a hel icopter and on foot . The foot sur vey in Slo ugh
SA focused on an upwel l i ng groundwate r vent vis ible to the unaided eye .
Three separate fi eld t rips were necessary to evaluat e the t herma l
i nfrared imagers used in t hi s study (Tabl e 10-2). Eac h i mager was
opera ted by a trained operator accordi ng to procedures ou t li ned in t his
respect i ve operati ng manual s. Infrared scan ning operations were
conducted primarily from a hel icopter fly ing at a near hover over t he
study area . Altitude ranged from 100 to 300 feet above the wa ter
surface . Duri ng the i nitial fi eld eva lu at i on , t hennal sca ns were a lso
conduct ed on foot .
DRAFT May 4, 1984
On Octo ber 24. 1983, the Hughes Probeye and the AGA Thermov ision were
eva lu at ed and compar ed . These eval uati ons were conducted during the
eve ning hour s in or der to mini mi ze t he the rmal t nt erference of su nlight
ref lecting off the water (the Pyroscan opera t es in a wave "l engt h ra nge
wh ich i s not influenced by sun light ). Sloughs 10 and 11 were scanned
dur in g this fie ld t r ip. Susitna River discharge was 5,800 cfs. All
i nf r a r ed scans on Oc t ober 24 , 1983 were conduc t ed from a helicopter
pl at f orm.
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DRAFT May 4, 1984
Table 10-2. Fi eld test ing condit ions and locations .
DATE SYSTEMS FIELD CONDIT IONS ST\IlY 5 I TES
830809 Huqhe. Pr obe,.. Br fg ht ; d.y1i gl'lt 51ou9" " andX.der Pyrose. n Sus t t". River 0 • 29 .900 eh. Slough 81.
8310n Hughes Probey. Br f ght ; dus k Slough 10 ..ndACA. Ther-ovh l on 750 Susttn. Ri ver 0 • 5850 ef • • Sl ough 11
8)11'$ ACA TheAOvhlon 750 D. rk; night Slough 10 1MSUitt", Ri ver 0 • 3,000 cf , . SlOU9h 9'"
( ' P9r oll . )
10- 1/
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2.3 Analyti cal Ap proach
Initi ally , the approach to this study appeared to be simple. Thenna l
i nfrared imagers were t o be evaluated under f ield conditions to assess
l imitat ions of the equipment t he approach evolved i nt o a more compl ex
methodol ogy. Eventually , specifi c surface water temperature ground
t ruthed data was obtained i n order to compare i nfrared detect ed
upwelling areas recorded on video t ape to actual measu red sur face wate r
10- 11-
Hay 4 , 1984
diffe rent upwelli ng
t he capabil i ti es andbecomi n9 famil i ar with
i n detect ing t hermal ly
Afte r
DRAFT
A f ina l f ie ld t ri p wa s taken on November 15. 1983 for evaluat ing the AGA
Thermovision sys t em exclusi vel y. Infrared scans were conduct ed at ni ght
duri ng t he very low, early wtnter- discharge condit io ns of the Sus itna
River (appr ox imat ely 4,000 cfs) . Wate r level s in the study sloughs were
very low with some ice cover . Inf r ared scans we re conducted from a
he l i eap t e r capab l e of ni ght fly ing . Sloughs 10 and 9A were scanned
during th is per i od.
t heir capabil it:'
groundwat ers .
Ground-tru t hed measurements of s l ough surface water temper atures were
coll ected only on the la st evaluation f ield t ri p. Surface water
tempera tures of Slough 10 were det ermined t imedf etely pri or to the
thermal in frared scan. Slough 9A surface water t emperat ures were ground
truthed two days after the infrared scanning fl ight. A 1500 foot re ach
of t he sl ough was divide d i nt o 100 transects. Surface water t emperatu re
measurement s were recor ded at two foot intervals every two feet along
t he transects. Temperatures were mea sured wi t h a Dig i-sense temperature
probe .
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ID- 1.3
t empe rat ures of the s loughs. Surface water temperature data col le ct ed
al ong transects for each slough were reduced into rough isothermal maps
which facil i tated the analysi s .
DRAFT May 4 , 1984
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.... . . 1
Xedar Pyroscan
The Xedar Pyroscan was evaluated on the f irst f ie l d t ri p. Al t hough the
image resolution was IOOch better than the Hughes Probeye, the Xedar
Pyroscan did not perform as wel l as t he Hughes Probeye in disti nguishing
surface water temperatu re differences . The different shades of gray on
the vi ewi ng screen. i ndi cat i ng di f ferences i n surface water temperature,
were extremely difficult to di scern. Since sunl ight does not aff!ct the
oper~ tion of t hi s imager because i t operates i n the 8- 14 um wave length
"window" , it was cons idered unnecessary to fur t her consi der t he xede r
Pyroscan as a possib le candidatt fo r detec t ing upwelli ng groundwater in
slou ghs.
Hay 4. 1984DRAFT
3. 0 RESULTS
Hughes Probeye
The Hughes Probeye was t es t ed dur ing two imager eval uat ion fi el d tri ps.
Thi s systern was eva1uated under different li ght (e . g. br i ght , sunny.
dark , etc ) and mainstem discharge conditions at three different sloughs
(Sloughs BA. 10, and 11) . The Hughes Probeye could not detect t herma l
differences of water when usee from an aerial platform but cou ld detect
the t her,r.! l difference of an upwelli ng groundwater vent when used from
the ground. Resol ut ion of all visual images were poor. Outline of
water bodies could not be readily distinguished. After the l as t field
tri p. it was decided t o suspend furthe r test ing of thi s system . The
Hughes Probeye was deemed i ncompati b1e with achi evement of the pr imary
objective of the study .
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tc- 15
1) Only Slough 10 woul d be infrared scanned in order to maximize
effor t in an area with a known high degree of upwel li ng.
Before the fi nal fi ela evaluat ion of the AGA Thenmov ision 750 sys t em on
November 15, 1983, th e fol l owi ng addit ional procedure s were i ncl uded i n
the methods:
May 4. 1984
AGA Thermov is ion 750
DRAFT
The AGA Thermov;s;on 750 was t ested dur i ng the last two f~eld tr i ps on
Octobe r 24 and November 15. 1983. Upwel l ing groundwaters were detected
i nf luenci ng t he surface water of Sloughs 10 and 9A I respect ively. during
these fli ghts . Although t he br i ght s ky conditions present at dusk
duri ng the Octo ber fie l d t rip hampered t he effecti veness of the i nfr ared
scanner to detect the subtl e sur fa ce wa ter temperature di fferenees of
t he slough I more upwell f n9 areas we re det ect ed as the sky grew dar ker .
Infrar ed scann ing operat ion s were suspended pri or to nig htfa l l because
of l ow he l i copt er fue l levels . The video data collected dur ing the
October f ield trip was very poor in quality.
Although the AGA Thermov ision 750 sys tem was capable of det ect i ng areas
of thermally different waters on the surface of t he slough, a defini ti ve
eva1uat i on was not made because of t he poor qual i ty of t he vi deo tape
caused by the br ight sky conditions . A second fiel d t r ip was scheduled
for November .
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•
DRAFT May 4. 1984
2) Ground t ru t hing of s urface water temperatu r es woul d be com
pleted immed iately pr ior to the thermal scani and
3) the t hermal in f rared scan of the s lo ugh would coemence afte r
dark t o avoi d th e bl'"ight sky condi t ions whi ch hampered the
effectiveness of the system ini ti al ly.
Therma1 ; nfr-ared imagery of t he AGA t hermovi s ian 750 system fa i1 ed to
l ocate the numerous known upwell ing groundwater vents in Slough 10
because of the homogeneous nature of the surface water t emperature of
t he slough. Homogeneous surface water temper ture wa s verif i ed by ground
trut hed mea sur ements . On ly one grou ndwater upwell ing area was l ocated
by the i nfrared imagery. At th is point there was only a 1. 40 C
difference i n slough surface water temperature and the temperature of
the upwell ing groundwate r reachin~ t he surface .
Because of the negative results (very few detectable surface anamol ie s )
gai ned duri ng the infrared therma l scan of Slough 10. it was i mmediat ely
deci ded to scan Slough 9A during the same ni ght. Ground truthing
measurements of surface water temperatures of Slough 9A were completed
two days later. The scan of Slough 9A detected numerous and varying
deg rees of surface wa t er temper~ture anoma lies . The scan of Slough 9A
was recorded on video tape . Photographs of the site (Plate 10-1) and
the video di sp1ay of the scan and t he cor respondi ng rough i sotherma 1
ma ps are displayed i n Plates 10· 2 through 10-4 and Figures 10-3 through
10-5 , respectively .
10-1 1"
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DRAFT May 4 , 1984
After comparing the resu lts of the i nfrared scans with t he rough
isotherma~ map constructed from the ground truthed sur face wa ter
temperature of Sl ough 9A. it became apparent that the AGA Thermovi s ion
750 sy st em was able to detect the thermally di fferent wat ers at the
surface of Sloughs 10 and 9A . Because of the slow fl owi ng nat ure of t he
s l ough and intens ity of t he trig ht s pot on t he fil m i ndicati ng warmer
waters. exact position of upwelling groundwater vents could be
pin-p ointed . However , ul"well ing waters reach ing the surface of the
sl ough which differed less than 1.4°C in tempera t ure cou ld not be
detect ed. Based upon t he comparison of t he i nfrared scan with t he
ground truthed i sothermal maps, it is apparent tha t of th e infrared
therma l imagers tested, the AGA Thermovision 750 is the most appl icab le
system for detecti ng upwel l ing groundwater i n sloughs .
10-11
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PLATE 10- 1 Aeri al photo of Slo"9h 9A (November 15. 1983 ) .scans of out l i ned areas are presented i n Platesthrough 10- 4 as indicated .
/0 -/13
Therma l10-2
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•..•n~
;:;~
r~
~
oc .o~_ 00
~ ~
"o0. •~
~ -
~ "o ~
c ~~ ~
u >~ 0z-~ .e"~ ,~c
~ -
N,C-
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'" . .
,.-
-~.•., .. .
gA
• .0
SLOUGH 9A
ISOTHERMA L MAP
....# ·. '.~H.· ..,.......~......
'ISLAND" .
....,.,,!..
II
~I ....I r(=~ .. -S
' 4.0
J .,.......... IOUgh
..........:'...,.:.....::......
ICE
' ;""":'>To
···.·0••~ : ~" , "4' "H.
\\ ' -- - -- - -_... ~.
~
'"
~..
~-o
ISOTHERM INTERVAL- 0 .5 ° C
o 10! ,
., [ E T
Fig ure 10- 3 Isot hermal map of a portion of Slough 9A developedfrom ground-truthtng data col lec ted Nov . 17 , 1983.Correspondi ng t herma l scan in Plat e 10-2.
--------- - - -
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PLATE 10- 3 Thermal scan of a port ton of Slough 9A (see Pl ate10- 1) , November IS , 1983.
to -2..1
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~
."..
• .0
2,. '6-'::
...::--....
, _ . . . . .. ,.1 • •
-;,.,...r-.. ..~.. ";io, .. . .
~ " ." ,...~. ,~... ; ..,...•,-
'" - · ' .1 ' . ' ~ ••~ .
'. i e ' .~. .. ... ".-.'
n~-~·~~fi;,·· ·- ·
'--_---- • .0 .......- -~ . , "
•~ •." _• •""' • • _ ~••••• .I " .. • , ,6 ••••••"" , .
t.'
v-rxv...{
-""\~
SLOUGH 9 A
150TH ERt.lAL t.l A P
ISOTH ERM INTERVAL. 0 .5 -co 10, ,
'£E T
Figure 10-4 Iso t he rma l map of a porti on of Sl ough 9A deve lopedt rom gro und-truthing data co llected Nov. 17 . 1983.Correspondi ng therma l scan in Plate 10-3.
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oo •O M- '"~ '"~oCo •....~--~0"011~ "u>~ 0
z~ .E:::'"~ o~ -
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_,.orr." r-_.....r~ • •
~.~q; - ~. ~ ~~~~:.~i;~: '. ,.g~"-: ,.., _ ".,..~ . "."-._ '-" "
...~. ' . ~ , ~ ...'
.. ...
....:._. ;~-..-.
.,-,". -' .
2 .0
'F:"'f,~•
.::.t- ~; ",.•. ",'f .;, ~ ,••., . " ' ," ~ .s .,.!.:.'.....
•
~
lEET
SLOUGH 9A
ISOTHERMAL MA P
ISOTHERlil INTERVAL- 0.5 °co '0, ,
... •.• ·.:.:u "..·.•
.....-. ~-:~n·':... · .·i ...<. . : ,.'"
-c.,~
Figure 10- 5 l sothennal map of a porti on of Slough 9A deve lopedf rom ground-truthing data co l l ected Nov . 17. 1983.Corresponding thermal scan in Pla te 10-4 .
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10- 2.';;
Both conditions were vio lated during the i nfrared scan of Slough 10.
(2) the upwel l ing groundwater reaches t he sur face of the receiv ing
body.
May 4 , 1984DRAFT
(1) a temperatu re difference of at le ast 1. 5°C - 2. 0oe exi sts
between the water bodies; and
4.0 DI SCUSSION
This study indicates that infrared t hermal imagery can be used to dete ct
upwelling groundwaters wit hin a larger body of water only if :
Inf rared thermal imagery can be used t o de tect upwell ing groundwaters
within the sloughs of the Susitna ~iver system when the proper
environmenta l condit ions exi st . Of the infrared imagers evaluated~ the
AGA Thermov i sion 750 i nfrared camera system proved to be t he best suited
imager fo r detect ing groundwate r i nfl uenced su rface water t emper at ure
anomalies . Although Slough 10 wa s know to contain numerous vigorous
upo,telling groundwate r areas. the homogenous infrared therma l image of
t he s lough indi cat ed that upwel l ing groundwater areas were scarce. This
obvious discrepancy has highl i ght ed the Hmitati ons of apply ing remote
sensi ng tech niques t o dete ct subsurfa ce groundwater i nflows in sloughs.
Although a few warmer groundwater i nflows entered the s laugh from the
substrate of Slough 10. these i nflows fail ed to influence the surface
wa t er temperatl re above the vent.
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A majori ty of t he groundwater in fl ows were isothermal wi th t he sur face
water. A few of these i nf l ows were vent ed under pressure caus ing an
obvious s urface water dis turbance wi th no de tec table change i n sur f ac e
water temperature. The homogeneity of the s lough sur face water
temperatur~ caused by t he isothermal condi t ions of t he slough and
gro undwat e r sources mas ked the upwell ing groundwater areas within the
s lough.
Groundwaters vent ed into the sloughs of the Susitna River genera l ly tend
to be more dense than t he surface water. The temperature /density
relat i onshi p of wa ter dicta tes that water is most dense at 4°C . Because
of this relati onship, colder waters (l es s than 4°C) in winter and warmer
waters (gr ea t e r than 4°C) in summer r ise to the surface. vented
groundwater i s usually warmer i n winter and cooler in summer t han s lou~h
surface water temperatures . Therefore , these waters remain nea r the
bottom of the slough becau se of the ir grea t e r density than the overlying
waters . Occasionally, when i sothermal conditio ns exist between the
water bodies, t he t emperat ur e re l a te~ densi t y gradient diminishes
a ll owing f r ee mixing of the qroundwater and s l ough water . In either
cas e , (dense r or i so t he nna l gr oundwater ) i nf r a r ed imagery wi ll not be
able to ass i s t in determin ing the l oca tion of t he SUbsur fa ce groundwater
vents in larger bodies of wa ter. Inf r a r ed i ma gery will a id i n
determining t he lo cation of groundwa t er vents only when the sur f ace
water temperature i s influenced by therma ll y different groundwa t ers.
Groundwater i nfl ows i n s ha 11 ow wat e r or groundwat er r e 1eases unde r
pres sure are t he two modes by which th erma l ly diff e r ent groundwa t ers ca n
reach and af fe ct the surface water of th e s10 ugh .•
DRAFT May 4. 1984
10- ;<10
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DRAFT May 4 , 1984
In order to ma ximize t he effic iency of the t he rma l i nf r a red image ry in
detecting slough surface water anoma l ies caused by upwe l 1 in~
groundwater. environment a l conditions mus t be i deal fo r detection . The
following is a li st of th e envi ronmenta l condit i or.s necessary t o
ma ximi ze eff ic ien cy:
(1) Infrared thermal scanni ng of t he wa t er body mus t be conducted
dur ing the dar k ni ght hou rs i n order to mi nimize any interfer
ence from the sun or bright ski es ;
(2) Infrared thenna l scanni ng mus t be done duri ng t he lowest
possi ble, i ce free, wa t er level s of the water body i n order t o
maxi mi ze t he chances t hat qrn undaa tar's wi 11 reech the SUrf,ICe
of t he wa te r body without s ignif i ca nt deviation from pc: nt
source; and
(3 ) Sur fa ce water temperatures and groundwa te r t emperat ures must
vary suffic ient l y to cau se a surf ace wa te r t empera t ure anoma iy
of at l ea s t 1. 50- 2 .0o e in order t o max imi ze detec t io n.
From the above conditi ons it is apparent tha t the per i od fo r t hennal
i nf rared imagery scanni ng on the Susitna Riv er is a dark ni ght in ear l.'
winter. i nmedi a t e ly prior to freeze- up. Slough 9A was scanned durin~ 1
near opt imal cond itions. The infrared i ma gery detected many surface
wate r temperatu re anoma l ies.
10-;),1
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Even when conditions are o?t imal . infrared i magery probably wi l l not be
able t o as s i s t i n dete rmining the locat io n of every upwell in g
gro undwa t e r vent i n the slough. Upwe l l i ng groundwaters may not reach
the surface in all cases. or may not be thermally different than surface
waters . Thermal imagery wil l definitel y a id in determining t he
locations of upwel l tng groundwa ter vent s i n the vi c in ity of detectable
surface water t emper!ture anoma l ies but wi l l not be abl e to a id i n the
determinat ion of vents benea t h homogeneous sur fa ce wa te r t emperatures .
Because of ~a ter depth and veloci ti es i n t he Sus i t na Ri ver ma instem and
tributaries. it is very unl i kely t hat small to moderat e upwe ll i ng
groundwater ar eas could be det ect ed us ing i nfr ared thermal scanni ng. In
order for groundwater t o be detected in these water bodies, the
magni tude of the groundwa ter i nfl ow wouId have to be much greater .
Inf r ared imagery used t o detect upwell i ng groundwater vents i n sl oughs
is an excell ent pros pecting tool capabl e of provi di ng a good deal of
positive resul t s on a la rge scal e . However , appli cati on of t hi s
t echni que for s ite specifi c eval uations of upwelli ng sourc es has not
proven t o be succes sful . As a resu lt other types of eval uat ions wl11 be
required for determining the presence of upwel l i ng as a function of fl ow
and mai nst em discharge i n s loughs and s ide channels.
DRAFT May 4. 1984
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DRAFT
6. 0 CONTRIBUTORS
Aquat ic Habitat and Instream Flow Studies(AH) Project leader and Principal Cont act
AH Fi sh Habitat Utilization Subprojectleader and Report Coordinator, Part 2
Graph i cs
Typing St aff
Ed ; tors
Data Col l ec t i on
Data Analysis
Text
IO-J.'i
May 4, 19B4
Chri stopher Estes
Andrew Hoffmann
Sal ly DonovanCarol Kerkv l ietAnn Rei 11y
Vi ck. i CunninghamMary Gressett
Christopher EstesAndrew HoffmannDoug Vincent-lang
Chri s topher EstesIsaac QueralGene SandoneShery l Sa l as kyKathy Sheehan
Gene Sandone
Gene SandoneChri stopher Estes
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The authors express their apprecia t i on to the following for the i r
assi stance in prepa r ing this report .
7.0 AC KNDWLEDGEMENT5
DRA FT May 4. 1984
The ot her ADF&G Su Hydro Aquati c Studies Program sta ff who
provided the ir suppor t t o th i s report .
Ri chard Town of Infrared Technology, Inc. who provided the AGA
Thermovi sion equipment and the time and expert ise to operat e i t .
Kat hy Ba rker of USO I , Bureau of Land Management. who provided
and operat ed t he Hughes Probeye.
State of Alaska. DNR. who provided t he Pyroscan.
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DRAFT
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10- 3 ;;k