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International Journal of Civil Engineering and Technology (IJCIET) Volume 9, Issue 5, May 2018, pp. 868–881, Article ID: IJCIET_09_05_094
Available online at http://www.iaeme.com/ijciet/issues.asp?JType=IJCIET&VType=9&IType=5
ISSN Print: 0976-6308 and ISSN Online: 0976-6316
© IAEME Publication Scopus Indexed
SEAFLOOR CHARACTERIZATION IN THE
GREAT BAY ESTUARY OF NEW HAMPSHIRE
Indra Budi Prasetyawan, Lilik Maslukah, Agus Anugroho Dwi Suryoputro, Gentur
Handoyo, Petrus Subardjo, Siddhi Saputro, Purwanto, Hariyadi, Jarot Marwoto,
Warsito Atmodjo, Heryoso Setiyono, Sri Yulina Wulandari, Muslim and Muh. Yusuf
Oceanography Department, Faculty of Fisheries and Marine Science,
Diponegoro University, Semarang, Indonesia
Indra Budi Prasetyawan
Center for Coastal Rehabilitation and Disaster Mitigation Studies (CoRem), Diponegoro
University, Semarang, Indonesia, Jl. Prof. H. Soedharto, SH, Tembalang Semarang. 50275
ABSTRACT
Great Bay Estuary is a tidal estuary located in Strafford and Rockingham counties in
eastern of New Hampshire, United States (43 ̊03' - 43 ̊08' N Latitude, 70 ̊40' - 70 ̊55' W
Longitude). Seafloor of Great Bay Estuary has a vary characteristic. This research
analyzed the seafloor characteristics for each station based on observation of sediment
(substrate type, size, color, etc.). In addition, this study explains how the seafloors are
differed at each station in response to changes in the physical environment such as
physical energy of the system. Sediments at station that are located at upper part of Great
Bay Estuary and shallower depth part in the horizontal longitudinal section are mud. This
is because energy at this area of the system is low. Stations that are located at the upper
part of Great Bay estuary, deeper depth part in the horizontal longitudinal section and in
the middle of the channel have bigger grain size of sediments. This condition affects tidal
current in the upper part of estuary and middle of channel (where the depth is deep)
becomes strong. Stations that were located in the middle of Great Bay Estuary had strong
tidal currents, thus at this station bigger sediments were found.
Keywords: estuary, depth, sediment, tidal, New Hampshire
Cite this Article: Indra Budi Prasetyawan, Lilik Maslukah, Agus Anugroho Dwi
Suryoputro, Gentur Handoyo, Petrus Subardjo, Siddhi Saputro, Purwanto, Hariyadi, Jarot
Marwoto, Warsito Atmodjo, Heryoso Setiyono, Sri Yulina Wulandari, Muslim and Muh.
Yusuf, Seafloor Characterization in the Great Bay Estuary of New Hampshire,
International Journal of Civil Engineering and Technology, 9(5), 2018, pp. 868–881.
http://www.iaeme.com/IJCIET/issues.asp?JType=IJCIET&VType=9&IType=5
Seafloor Characterization in the Great Bay Estuary of New Hampshire
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1. INTRODUCTION
Seafloor characterization is essential to study especially in the environment that is
oceanographically controlled, such as in the estuary. There are some areas near estuary that
happen cross-shore and long-shore sediment movement and due to dynamic water levels at
the coastal area [1] [2]. Estuaries defined as those water bodies where the river meets the sea.
Estuarine are often classified as low-energy coasts and are, therefore, expected to undergo
little variation [3].
In the estuaries, sediments carried by estuarine waters typically encompass a range of
sizes from less than 2 m (0.002 mm) to more than 4 mm, but the finer sizes dominate most
estuaries. A very few estuaries transport gravel and larger size sediment. The bed and banks
of most estuaries, however, tend to be dominated by clays and silts, with sand and larger sizes
depositing either at the head of the estuary (from upstream sources) or at the sea or ocean
entrance (from downstream sources). Fine-grained sediments—clay sizes and some silts—
include both inorganic and organic materials and are almost universally called mud [4].
The research was conducted on the UNH RV Gulf Challenger on Saturday, September 13,
2014 in Great Bay Estuary (Figure 1). Great Bay Estuary is a tidal estuary located in
Strafford and Rockingham counties in eastern New Hampshire, United States (43 ̊03' - 43 ̊08'
N Latitude, 70 ̊40' - 70 ̊55' W Longitude). Great Bay lies at the confluence of tidally driven
seawater from the Gulf of Maine and fresh water from seven major river systems—the
Salmon Falls, Cocheco, Bellamy, Oyster, Lamprey, Squamscott, and Winnicut [5].
Figure 1 Great Bay Estuary [6]
The objective of the research is to characterize the seafloor in Great Bay estuary using (1)
previously collected multi-beam maps of bathymetry and backscatter [7] [8], and collecting
(2) single-beam echo-sounder profiles [9], (3) underwater video, and (4) bottom sediment
samples. It is expected to be able to analyze seafloor characteristics for each station based of
observation of sediment or substrate type, size, color, etc. and be able to explain how the
seafloor differed at each station in response to changes in the physical environment such as
physical energy of the system (currents or waves).
2. METHODOLOGY
2.1. Sampling Station Location
The sampling on this cruise was conducted in seven stations, i.e. Station 1, Station A, Station
B, Station C, Station D, Station E, and Station F. Detail description and sampling station map
showed on Table 1 and Figure 2.
Indra Budi Prasetyawan, Lilik Maslukah, Agus Anugroho Dwi Suryoputro, Gentur Handoyo,
Petrus Subardjo, Siddhi Saputro, Purwanto, Hariyadi, Jarot Marwoto, Warsito Atmodjo,
Heryoso Setiyono, Sri Yulina Wulandari, Muslim and Muh. Yusuf
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Table 1 Sampling Station
Station
Name Lattitude Longitude Depth (m) Type
Time
EST
1 43.069 N 70.7045 W 12.8 Shipek Grab Sample 10:39:00
A 43.0870 N 70.8671 W 6.0 Shipek Grab and Core Gravity
Sample 12:53:00
B 43.0853 N 70.8641 W 15.7 Shipek Grab Sample 13:11:00
C 43.1099 N 70.8574 W 16.2 Shipek Grab Sample 13:46:17
D 43.1104 N 70.8633 W 3.6 Shipek Grab Sample 14:06:19
E 43.1064 N 70.7907 W 15.0 Shipek Grab Sample 14:54:00
F 43.1026 N 70.7887 W 10.7 Shipek Grab Sample 15:08:40
Figure 2 Sampling Station Map
2.2. Equipment
2.2.1. Single Beam Echosounder
The type of acoustic system on the boat that was used on the cruise was an Odom Echotrac
CV200 Single Beam Echo Sounder. This Echo sounders measure water depth by sending
acoustic pulses through a transducer and picks up the reflected echoes. The depth is calculated
from the two way travel time of the velocity of sound in water. As the vessel moves a single
beam echo sounder (SBES) repeatedly "ping" the seafloor with a sound pulse, producing a
discrete print of depths beneath the ship as shown in Figure 3 [10] [11].
Figure 3 Principle of Single Beam Sounding [12]
The single beam echo-sounder sends an acoustic pulse from the transducer down into the
water column towards the sea bottom. The travel time before the signal is received back will
give, together with the correct sound speed, the water depth under the transducer. This Odom
Echotrac CV200 Single Beam Echo Sounder used two frequency, i.e. 24 KHz and 200 KHz.
The frequency is directly related to the absorption in the medium. Typical SBES frequencies
range from 12 kHz to 300 kHz. High frequencies are therefore less suitable for measurements
in greater depths. Furthermore a low frequency will have a deeper penetration into the seabed
and therefore carries more information about deeper layers back to the receiver [12] [13].
Seafloor Characterization in the Great Bay Estuary of New Hampshire
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2.2.2. Underwater Video
Underwater video systems are commonly used to collect video images of the deep seafloor for
a wide variety of purposes [14] [15]. Underwater video that was used for this cruise is showed
in Figure 4. All the connections of this tool are color coded and connect the CANOPUS: blue
– camera, red – PC interface, and yellow – CANOPUS power supply. The camera has
connectors. One connects to the CANOPUS and the other to a power supply. The power
outlets are required: CANOPUS, camera and the PC. This tool is used to record movie and
capture image of seafloor.
Figure 4 Underwater Video
2.2.3. Core Gravity Sampler
The gravity corer or core gravity sampler allows researchers to sample and study sediment
layers at the bottom of lakes or oceans (Figure 5) [16]. It got its name because gravity carries
it to the bottom of the water body. Recovering sediment cores allows scientists to see the
presence or absence of specific fossils in the mud that may indicate climate patterns at times
in the past. Scientists can then use this information to improve understanding of the climate
system and predict patterns and events in the future. Cores capture a time capsule that, in
some cases, can span the past hundreds of thousands and even millions of years. Because
sedimentation rates in some areas are quite slow, even a smaller corer a few meters in length
may represent thousands of years of particles. These particles are a historical record of
condition in the water column can be used to reconstruct past conditions on Earth [17] [18].
Figure 5 Core Gravity Sampler
2.2.4. Shipek Sediment Grab
Sediment samples were collected using a Shipek grab [19]. Shipek Sediment Grab (as seen on
Figure 6) is based upon the patented design of the late Carl J. Shipek, noted oceanographer,
and is manufactured by Wildco® under license. It consists of two concentric half cylinders,
the outer of which is the sampler body. A cocking wrench, included, is used for winding the
torsion springs. A safety hook prevents their premature release when held in the safety
position. Cast into each end of the frame are large stabilizing handles which, along with its
weight, hold the sampler upright during descent. This hefty center-pivot sampler is designed
Indra Budi Prasetyawan, Lilik Maslukah, Agus Anugroho Dwi Suryoputro, Gentur Handoyo,
Petrus Subardjo, Siddhi Saputro, Purwanto, Hariyadi, Jarot Marwoto, Warsito Atmodjo,
Heryoso Setiyono, Sri Yulina Wulandari, Muslim and Muh. Yusuf
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to sample unconsolidated sediments from soft ooze to hard-packed silts from deep lakes and
near offshore. It brings up virtually un- disturbed, unwashed samples to the surface from any
depth. Its specialty is sampling benthic organisms living at or immediately below the
water/bottom interface and sediment containing a significant population of non-sessile forms
[20].
Figure 6 Shipek Sediment Grab
3. RESULTS AND DISCUSSION
The position of station 1 is 43.069 N Latitude and 70.7045 W Longitude. Station 1 is located at
lower estuary of Great Bay Estuary and in the middle of channel. Multi-beam echo-sounding
resulted as seen Figure 7. This multi-beam maps are mostly made from a Reson 8100 Multi-
beam Echo-sounder. A multi-beam echo-sounder is a device typically used to determine the
depth of water and the nature of the seabed. This system allowed survey vessels to produce
high-resolution coverage of wide swaths of the ocean bottom in far less ship time than would
have been required for a single-beam echo sounder. Figure 7 shows ocean floor map of the
station 1 and its surroundings. There are sand waves at the bottom at the station waves. The
existence of sand waves indicates a bottom current at that location is strong. Based on the
research of Wirasatriya et al. [22], the bigger size of sediment has more weight so that this
type of sediment could settle along the coastline where the longshore current was generated.
The smaller sizes of sediment settle away from the coastline in the more calm waters.
Figure 8 shows the depth from transect sounding (pier to station 1) using single beam
echo-sounder with 24 KHz frequency. This Figure gives profile of depth along transect route
of this boat. Station 1 is in red line, and from this single-beam echo-sounder, we can know
that the depth of station 1 is 12.8 m. The red scatter shows the strongest signal. Yellow is
weaker than red, green is weaker than yellow, and blue is the weakest then assumed as a
noise.
Figure 7 Seafloor of Station 1 from Multi Beam Echo-sounder (Courtesy: CCOM /JHC UNH, 2014)
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Figure 8 Seafloor of Station 1 from Single Beam Echo-sounder
The Figure of bottom sediment that was captured by underwater video in 2013 shows that
bottom sediment at station 1 is coarse sand, see Figure 9.a. It can be confirmed with sediment
sample from shipek sediment grab (Figure 9.b.). Based on sediment sample observation in
September 17, 2014, we can know that sediment at station 1is coarse sand with grain size
estimation ± 600 µm. The color of that sediment is gray. Station 1 that is located in the lower
estuary dominated by coarse-grained sediment deposits and contains 50% of shell fragments.
The fact that tidal currents in this area are strong (thypically estuary) makes assumption that
there is limited sediment supply.
The position of station A is 43.0870 N Latitude and 70.8671 W Longitude. Station A is
located at upper estuary of Great Bay Estuary and shallower depth part in the horizontal
longitudinal section of the channel. It can be seen from multi-beam echo-sounding result in
Figure 10.a.Figure 10.b shows the depth from transect sounding (station A to station B) using
single beam echosounder with 24 KHz frequency. This Figure gives profile of depth along
transect route of this boat. Station A is in red line. The depth of station A is 6 m.
(a) (b)
Figure 9 a. Bottom Sediment at Station 1 (Captured by Underwater Video in July 3, 2013). b. Bottom
Sediment Sample at Station 1 (Shipek Sediment Grab)
Indra Budi Prasetyawan, Lilik Maslukah, Agus Anugroho Dwi Suryoputro, Gentur Handoyo,
Petrus Subardjo, Siddhi Saputro, Purwanto, Hariyadi, Jarot Marwoto, Warsito Atmodjo,
Heryoso Setiyono, Sri Yulina Wulandari, Muslim and Muh. Yusuf
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(a) (b)
Figure 10 a. Seafloor of Station A from Multi Beam Echosounder. b. Seafloor of Station A – Station
B from Single Beam Echosounder (Courtesy: CCOM /JHC UNH, 2014)
Bottom sediment at station A is mud as seen Figure 11.b. and based on observation with
grain size estimation < 0.0625 mm and the color of that sediments is dark gray. The Figure of
bottom sediment that was captured by underwater video in 2013 shows that bottom sediment
at station A is mud with shell fragments, see Figure 11.a. Station A that is located in the upper
estuary and at the side of channel where the depth is shallow gives consequences that tidal
currents are not as strong as in the deeper depth (effect of bottom friction). Therefore station
A is dominated by mud deposits because at this area energy of the system is not high.
(a) (b)
Figure 11 a. Bottom Sediment at Station A (Captured by Underwater Video in July 3, 2013). b.
Bottom Sediment Sample at Station A (Shipek Sediment Grab)
Core gravity sampling also gives the same result that bottom sediment of station A is mud,
see Figure 12.
Figure 12 Core Gravity Sampler
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The position of station B is 43.0853 N Latitude and 70.8641 W Longitude. Station B is
located at upper estuary of Great Bay Estuary and deeper depth part in the horizontal
longitudinal section and in the middle of the channel. It can be seen from multibeam
echosounding result in Figure 13.a. Figure 13.b shows the depth from transect sounding
(station A to station B) using single beam echosounder with 24 KHz frequency. Station B is
in blue line. The depth of station B is 15.7 m.
(a) (b)
Figure 13 a. Seafloor of Station B from Multi Beam Echosounder. b. Seafloor of Station A – Station
B from Single Beam Echosounder (Courtesy: CCOM /JHC UNH, 2014)
Bottom sediment at station B is granule gravel – pebble gravel with a few shell fragments
as seen Figure 14.b. and based on observation with grain size estimation ± 1 mm - 5cm and
the color of that sediment is red brown. This color could be due to oxidation. The Figure of
bottom sediment that was captured by underwater video in 2013 shows that bottom sediment
at station B is granule gravel – pebble gravel with a few shell fragments, see Figure 14.a.
Station B that is located in the upper estuary and in the middle of channel where the depth is
deep gives consequences that tidal currents are strong. Therefore station B is dominated by
granule gravel – pebble gravel deposits because at this area energy of the system is high. The
stronger currents can transport bigger size sediments.
.
(a) (b)
Figure 14 a. Bottom Sediment at Station B (Captured by Underwater Video in July 3, 2013). b.
Bottom Sediment Sample at Station B (Shipek Sediment Grab)
The position of station C is 43.1099 N Latitude and 70.8574 W Longitude. Station C is
located at upper estuary of Great Bay Estuary and deeper depth part in the horizontal
longitudinal section and in the middle of the channel. It can be seen from multibeam
echosounding result in Figure 15.a. Figure 15.b shows the depth from transect sounding
(station C to station D) using single beam echosounder with 24 KHz frequency. Station C is
in blue line. The depth of station C is 16.2 m.
Indra Budi Prasetyawan, Lilik Maslukah, Agus Anugroho Dwi Suryoputro, Gentur Handoyo,
Petrus Subardjo, Siddhi Saputro, Purwanto, Hariyadi, Jarot Marwoto, Warsito Atmodjo,
Heryoso Setiyono, Sri Yulina Wulandari, Muslim and Muh. Yusuf
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(a) (b)
Figure 15 a. Seafloor of Station C from Multi Beam Echosounder. b. Seafloor of Station C – Station
D from Single Beam Echosounder (Courtesy: CCOM /JHC UNH, 2014)
Bottom sediment at station C is granule gravel – pebble gravel with shell fragments as
seen Figure 16.b. and based on observation with grain size estimation ± 2 mm – 6.4cm and
the color of that sediment is dark gray. The Figure of bottom sediment that was captured by
underwater video in 2013 shows that bottom sediment at station B is granule gravel – pebble
gravel with shell fragments, see Figure 16.a. Same thing with station B that is located in the
upper estuary and in the middle of channel where the depth is deep makes tidal currents are
strong. These strong currents can transport bigger size sediments. These fact give
consequences that at station C is dominated by granule gravel – pebble gravel deposits
because at this area energy of the system is high.
(a) (b)
Figure 16 a. Bottom Sediment at Station C (Captured by Underwater Video in July 3, 2013). b.
Bottom Sediment Sample at Station C (Shipek Sediment Grab)
The position of station D is 43.1104 N Latitude and 70.8633 W Longitude. Station D is
located at upper estuary of Great Bay Estuary and shallower depth part in the horizontal
longitudinal section. It can be seen from multibeam echosounding result in Figure 17.a.
Figure 17.b shows the depth from transect sounding (station C to station D) using single beam
echosounder with 24 KHz frequency. Station D is in red line. The depth of station D is 3.6 m.
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(a) (b)
Figure 17 a. Seafloor of Station D from Multi Beam Echosounder. b. Seafloor of Station C –Station D
from Single Beam Echosounder (Courtesy: CCOM /JHC UNH, 2014)
Bottom sediment at station D is mud as seen Figure 18.b. and based on observation with
grain size estimation < 0.0625 mm and the color of sediment is dark gray. The Figure of
bottom sediment that was captured by underwater video in 2013 shows that bottom sediment
at station D is mud, see Figure 18.a. Same thing with station A that is located in the upper
estuary and at the side of channel where the depth is shallow gives consequences that tidal
currents are not too strong. Therefore station D is dominated by mud deposits because at this
area energy of the system is low.
The position of station E is 43.1064 N Latitude and 70.7907 W Longitude. Station E is located
at middle estuary of Great Bay Estuary. It can be seen from multibeam echosounding result in
Figure 19.a. Figure 19.b. shows the depth from transect sounding (station E to station F) using
single beam echosounder with 24 KHz frequency. Station E is in blue line. The depth of
station E is 15 m.
Figure 18 a. Bottom Sediment at Station D (Captured by Underwater Video in July 3, 2013). b.
Bottom Sediment Sample at Station D (Shipek Sediment Grab)
Indra Budi Prasetyawan, Lilik Maslukah, Agus Anugroho Dwi Suryoputro, Gentur Handoyo,
Petrus Subardjo, Siddhi Saputro, Purwanto, Hariyadi, Jarot Marwoto, Warsito Atmodjo,
Heryoso Setiyono, Sri Yulina Wulandari, Muslim and Muh. Yusuf
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(a) (b)
Figure 19 a. Seafloor of Station E from Multi Beam Echosounder. b. Seafloor of Station E -Station F
from Single Beam Echosounder (Courtesy: CCOM /JHC UNH, 2014)
Bottom sediment at station E is granule gravel – pebble gravel with cobbles as seen Figure
20.b. and based on observation with grain size estimation varies and the color of that
sediments is light brown. The Figure of bottom sediment that was captured by underwater
video in 2013 shows that bottom sediment at station B is granule gravel – pebble gravel with
cobbles, see Figure 20.a. There are roots of plant. The middle of Great Bay Estuary system
has a high energy system, the tidal currents is suspected are strong. This strong current can
transport bigger size sediments thus we can find bigger size sediments at this station.
(a) (b)
Figure 20 a. Bottom Sediment at Station E (Captured by Underwater Video in July 3, 2013). b.
Bottom Sediment Sample at Station E (Shipek Sediment Grab)
The position of station F is 43.1026 N Latitude and 70.7887 W Longitude. Station F is located
at middle estuary of Great Bay Estuary. It can be seen from multibeam echosounder result in
Figure 21.a. Figure 21.b shows the depth from transect sounding (station E to station F) using
single beam echosounder with 24 KHz frequency. Station F is in red line. The depth of station
F is 10.7 m.
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(a) (b)
Figure 21 a. Seafloor of Station F from Multi Beam Echosounder. b. Seafloor of Station E -Station F
from Single Beam Echosounder (Courtesy: CCOM /JHC UNH, 2014)
Bottom sediment at station F has similarity with at station F. The sediments are medium to
coarse sand, granule gravel – pebble gravel with cobbles as seen in Figure 22.a and 22.b. The
factor that involves is high energy system. Tidal currents in the middle of Great Bay Estuary
system are strong.
(a) (b)
Figure 22 a. Bottom Sediment at Station F (Captured by Underwater Video in July 3, 2013). b.
Bottom Sediment Sample at Station F (Shipek Sediment Grab)
In order to gain better seafloor characterizations, this research needs to be developed and
improved. The gravel fractions tended to be under-sampled due to the methodology used.
Also, higher energy conditions were not sampled. Therefore, additional studies are needed to
fully understand the seasonal changes or changes related to calm (low energy) versus stormy
(high energy) conditions in sediment size, characteristics and verification of results.
4. CONCLUSION
Seafloor of Great Bay Estuary has a vary characteristic. Sediments at station A and D that are
located at upper estuary of Great Bay Estuary and shallower depth part in the horizontal
longitudinal section are mud. Station B and C that are located at upper estuary of Great Bay
Estuary and deeper depth part in the horizontal longitudinal section and in the middle of the
channel have bigger grain size sediments, i.e. pebble gravel and cobble gravel. In the upper
estuary and at the side of channel where the depth is shallow give consequences tidal currents
are not too strong. Therefore station A and D is dominated by mud deposits because at this
area energy of the system is low. Otherwise station B and C are located in the upper estuary
and in the middle of channel where the depth is deep makes tidal currents are strong. These
Indra Budi Prasetyawan, Lilik Maslukah, Agus Anugroho Dwi Suryoputro, Gentur Handoyo,
Petrus Subardjo, Siddhi Saputro, Purwanto, Hariyadi, Jarot Marwoto, Warsito Atmodjo,
Heryoso Setiyono, Sri Yulina Wulandari, Muslim and Muh. Yusuf
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strong currents can transport bigger size sediments. Therefore these stations are dominated by
granule gravel – pebble gravel deposits because at this area energy of the system is high.
Station E and F are located in the middle of Great Bay Estuary system that has strong tidal
currents, thus at this station bigger sediments were found.
ACKNOWLEDGEMENT
We would like to thanks to Center for Coastal and Ocean Mapping/ Joint Hydrographic
Center (CCOM/JHC), University of New Hampshire for facilities during the research, Center
for Coastal Rehabilitation and Disaster Mitigation Studies (CoRem), Diponegoro University,
Semarang, Indonesia and to all of those who have assisted in the preparation of this research.
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