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| Title: | The Planning of DOW Pipeline Reconstruction near the Estuary Areas of Chi-Ben River in Taitung County of Taiwan |
| Authors: | Liu（劉金源）, Jin-Yuan;Chan（詹成富）, Chan-Fu;Chen（陳盈貞）, Ying-Chen |
| Date: | 2019-10-08 |
| Issue Date: | 2021-09-03 12:12:24 (UTC+8) |
| Abstract: | The purpose of this presentation is to
discuss the planning and relevant engineering
issues relating to the reconstruction of a deep
ocean water (DOW) pipeline near the estuary
areas of the Chi-Ben River in Taitung County
of Taiwan. In 2012, the DOW pipeline
constructed for the Eastern Taiwan Deep Sea
Water Innovation & Research Center (ETDIC)
collapsed after typhoon activity and has been
unable to supply DOW since then, resulting in
severe adverse effects to DOW industrial
development in Eastern Taiwan. Due to the
fact that ETDIC had been established and
operated since 2009 by the Ministry of
Economic Affairs (MOEA), and had played an
important role for DOW development, MOEA
has decided to reconstruct the pipeline. Currently, planning and execution are
underway.
After a thorough investigation by the use of
underwater acoustic instruments including
side-scan sonar and the multi-beam system
(shown in Figure 1) and/or remotely-operated
vehicle (ROV), it has been concluded that the
failure of the DOW pipeline was caused by the
following two factors:
1. Environmental Factors: the large amount
of sand and silt carried by the Chi-Ben River
after the typhoon rain may have resulted in a
large deposit and sediment movement beyond
the safety factor set by the design limits.
2. Design and Construction Factors: ROV
images have shown that the connectors
between pipelines were displaced, and the
pipelines themselves were too far away from
the planned route, indicating that the
techniques on pipeline connectors and
positioning of pipeline laying are very
important.
In view of aforementioned problems, the
new project has been proposed as follows:
1. In response to the environmental factor,
two new routes, route A and B, are under
investigation and planning (Figure 2). Route A
is about 1.5-2.5 km away from the south of the
Chi-Ben River mouth, and the seabed slope is
relatively smooth and stable in comparison
with all five routes surveyed. The seabed
consists mostly of pebbles. The other
alternative route B under consideration is
about 2.5-3.2 km south of the Chi-Ben River
mouth. In addition, there are many factors that
need to be considered.
2. In response to the pipeline design and
construction method problems, it is necessary
to carefully choose the materials used for the
pipeline construction, e.g., HDPE with pull
strength higher than 230 kg/m2 and bend
strength of 350 kg/m2. The approaches employed for laying down the pipeline and the positioning of the pipeline are of utmost importance. |
| Appears in Collections: | [電機工程學系暨研究所] 會議論文
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