1. 31 2009 11 st Proceeding of the 31 Ocean Engineering
Conference in Taiwan National Chung Hsing University, November 2009
1*2 1 2 50 98 6 0.5 0.8 Field experimental study on a soft
protecting method for coastal erosion prevention *Ta-Hsiung Peng
Chyan-Deng Jan *Ph.D. Candidate, Department of Hydraulic and Ocean
Engineering, National Chen Kung UniversityABSTRACT The structures
which are used to protect coastal erosion are very expensive to
construct and it is important to protect these structures from
damage. Usually those structures like: embankments, breakwaters,
jetties etc. are constructed by concrete and very rigid methods
like tetrapod, groyne etc are used to protect those structures. But
those rigid methods are not very effective always, because very
high energy could not be absorbed by those methods. To protect the
coastal erosion by reducing the energy, a flexible device is
introduced which will reduce energy and protect coastline
economically and environmentally as well. The flexible device is a
combination of flexible wire net and stack of rings with soften
blades attached with used tires. This flexible wire net is placed
in between two stack of rings with soften blades. The stack of
rings with soften blades is used to hold the flexible wire net and
the flexible wire net is used to reduce the energy gently which
helps to deposit the sediment in the coast. The device is placed at
Shuang-Chun coastal area in Tainan County on June, 2009. The length
of the device is 50.0 meters. The wave energy usually coming from
sea is absorbing gently by the device and a typhoon called Linfa
and Morakot passed on the device. The device has worked effectively
during normal period and typhoon period as well and it has
developed a very good amount of sediment deposition around the
device. The observed results revealed that the sediment deposition
depth around the device various from 0.5m to 0.8m. Keywords: Stack
of rings; soften blades; flexible wire net; reduce energy; coastal
protection 2. 2m 1.1 2.3 2.3.1 2.3.2 2.3.3 ()2.3.4 2.3.5 4 1.2
2.3.6 1 1 1.3 3.1 2007 2 28 2009 1 3 6 2007/2/28~2009/1/3 11 2 1
2005 5 27 2009 1 3 1 2005/5/27~2009/1/3 4() 13.4 3 0.552m 0.774m 6
2 7 ( 2.1 ) 75 50 3.2 A. 5 (98.05.17) (98.08.15) 0 4 44M 1 B.
14,886M 2.2 C. 2 2 50m 4m 3. 3. (2000)2000 25807004. (2001)2001
25806505. (2002)2002 6. (2003)2003 2580600 7. (2004)2004 2580550 8.
(2008) 25805009. (2004) 2580450158750158800 158850 10. (2000) 5 (()
m) 11. (2005) ()3/3 50M 12. (2006) (98 ) 13. (2007) 100M 150M (
NSC97-2622-E006-024-CC1) 1. (1998) 2. (2000) 4. 1 2 2007 2009 32005
2009 5. 4 1 1 () H(m) 1 1 2 3 4 5 6 2
H1(98.05.17)-0.619-0.820-0.835-0.816-0.801-0.660-0.715 -0.815
H2(98.07.26) 0.115-0.123-0.141-0.064-0.011-0.107-0.469 -0.246
H3(98.08.15)-0.067-0.104-0.072-0.044-0.027-0.058-0.042 -0.046
H0.552 0.7160.7630.772 0.774 0.6020.673 0.769 6 6. 2 () (m)
0102030405060 708090 100 110 98.05.17()0.681 0.383 0.085 -0.213
-0.511 -0.746 -0.956 -1.176 98.07.26 1.62 1.132 0.92
0.70.480.260.04 -0.14 -0.183 -0.402 98.08.15( 1.67 1.316 0.961
0.673 0.482 0.292 0.105 0.0480.015 -0.056 -0.167 -0.35) : 75m 7
2
