This
is Ralph Allen Acierto, project researcher of Kawasaki group from River and
Environmental Engineering Laboratory. The site visit to Bago River Basin in
Myanmar was done from 27-31 October 2015. The objective of the site visit was
to establish the impact of tidal fluctuations and get some observations in Bago
River basin primarily near the confluence of Bago River and Yangon River. The
map below shows the areas visited during the field site visit. For this post,
it details the activities done for sites 5-7 that are located in the midstream
area of Bago River.
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Figure 1.
Annotated Bago River Field Site Visit locations from MotionX Offline map.
(1)Excel River View Hotel; (2)Star City Site; (3) Thilawa Site; (4)Yangon Site;
(5) Midstream bridge crossing in Bago River; (6) Bago City site observation;
and (7) Tawa sluicegate
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29 October 2015
In
the afternoon, the team was divided into two groups, one for installing camera
in Yangon River site and other group went to visit midstream area of Bago River
near Bago City. For the Bago River group, we went to three sites as indicated
by the numbers 5-7 in Figure 1. On the way to Tawa sluicegate, we encountered a
bridge crossing along the Bago River and decided to check the tide level marks
on the bridge and nearby area. In addition, we stopped by a nearby area where
people were residing to interview them regarding the typical tide fluctuation
on the area. According to the locals, an estimated 2-3meter fluctuations is
usually seen on this area. This was confirmed by checking the tide marks on the
river bank as indicated by the wet (darker) water mark on the river bank soil.
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Figure 2.
(5) Bridge crossing at midstream of Bago River. Top left and right picture
shows the bridge at the site with low tide condition. Left bottom picture shows
downstream of the bridge crossing and extent of high tide fluctuation indicated
by wet river bank
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Then,
we proceeded to Bago City where a site observation under Department of
Meteorology and Hydrology (DMH) as shown in Figure 3. In the picture, we can
see the downstream of Bago River and showing the observation instruments for
automatic weather station (AWS) and water level gauge as part of the current
telemetry system for Bago River. We went to the DMH site observation office and
talked to the officers-in-charge to ask about the tide levels. They have
informed us that during full moon tide fluctuation can reach up to 0.60 to 0.70
meters. This information establishes that the tide fluctuations affect even up
to the midstream reach of Bago River Basin.
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Figure 3.
(6) Bago City observation site showing the AWS instruments(left top picture)
and water level gauge (bottom right picture)
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After
a short break and discussion at DMH observation office, we proceeded to Tawa
sluicegate. Figures 4 to 7 show the different views of the upstream and
downstream of Tawa sluicegate. At the time we visited, the sluicegate was
closed as shown in the pictures. The downstream side of the sluicegate has
little to no water flowing.
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Figure 4.
(7) Tawa sluice gate showing downstream closed gate condition
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Figure 5.
Figure 10. (7) Tawa sluice gate structures
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The
upstream side of the sluicegate shows a reservoir with a water level at 15.4
meter indicating a 7.4 meter depth given an 8 meter river bed level (based from
the downstream river bed level shown in Figure 4).
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Figure 6.
(7) Tawa sluicegate showing upstream closed gate condition
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Figure 7.
Upstream area of the Tawa sluicegate
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31 October 2015
In
addition to the field site visit, we visited YTU campus for a meeting and
turnover of two Mobotix camera used in the field observations as shown in
Figure 8. During the meeting, three presentations were delivered. Two
presentations from University of Tokyo side and one presentation from YTU side.
The presentations were to update each other on the current progress of
respective researches related to the project. Additional logistical concerns
related to an upcoming workshop at YTU for next month were also discussed. After the meeting, we directly proceeded to the international airport and waited for our flight back to Tokyo in the evening.
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Figure 8.
Left picture shows the turnover of two Mobotix camera used for observations to
YTU and right picture shows presentation to YTU counterparts
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