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Sains Malaysiana 46(11)(2017):
2061-2074
http://dx.doi.org/10.17576/jsm-2017-4611-06
Experimental Study on Propagation and
Attenuation Regularity ofLandslide Surge
(Kajian Uji Kaji ke atas Ketetapan Perambatan dan Pemerosotan Pusuan Gelongsoran Tanah) FUXING ZU1, PINGYI WANG1,
JIQING XU1 & LIQUAN XIE2*
1School of River and Ocean Engineering,
Chongqing Jiaotong University,
Chongqing 400074, China
2Department of Hydraulic
Engineering, Tongji University, Shanghai 200092, China
Diserahkan: 10 Januari 2017/Diterima: 16 Mei 2017
ABSTRACT
On the basis of landslide surge model test by adopting generalized
simulation of waterways, this paper, for the first time, established a
four-dimensional mathematical model between wave height transmissibility rate
and the initial wave height, water depth, azimuth angle as well as propagation
distance through utilizing the method of tensor space mapping. Using the new
model, we proposed an empirical wave field covering all areas of the channel
including the attenuation area within the width of a landslide mass, the
straight channel attenuation area outside the width of the landslide mass, the
curved channel attenuation area and the after-curve attenuation area, which
comprehensively reflects the progressive changes of surge wave factors. The
transmissibility of wave height and propagation distance are in a bivariate
negative exponential distribution, and the wave height gradually reduces and
the attenuation also slows down as the propagation distance increases; wave
height transmissibility rate, azimuth and propagation distance are in a trivariate negative exponential distribution, the
attenuation of the wave height in the straight channel within the width of the
landslide mass was the slowest, followed by that of wave in the straight
channel outside the width of the landslide mass, and the attenuation of the
wave height in the curved channel is the greatest. This empirical wave field
was based on test data, scientifically abstracted the general regularity of the
propagation and attenuation of landslide surge, which can be applied to similar
analyses and forecasts on landslide surge and can scientifically and accurately
determine the damage range of landslide surge.
Keywords: Attenuation regularity; damage range; empirical wave field;
four-dimensional mathematical model; landslide surge; propagation regularity;
tensor space mapping
ABSTRAK
Berdasarkan ujian model pusuan gelongsoran tanah dengan menggunakan simulasi menyeluruh laluan air, untuk pertama kali dalam kertas ini, dibangunkan sebuah model matematik empat dimensi antara kadar ketersebaran ketinggian ombak dan ketinggian gelombang pemula, kedalaman air, sudut azimuth serta jarak perambatan melalui penggunaan kaedah pemetaan ruang tensor. Menggunakan model baru ini,
kami cadangkan bidang gelombang empirik meliputi semua kawasan saluran termasuk kawasan pemerosotan dalam lingkungan lebar jisim gelongsoran tanah, saluran lurus kawasan pemerosotan di luar kelebaran jisim gelongsoran tanah, saluran lengkung kawasan pemerosotan dan kawasan pemerosotan selepas lengkung, yang secara menyeluruh menunjukkan perubahan progresif faktor pusuan gelombang. Ketersebaran ketinggian ombak dan jarak perambatan adalah dalam agihan eksponen negatif bivariat serta ketinggian gelombang secara beransur-ansur berkurang dan pemerosotan juga semakin berkurang apabila jarak perambatan meningkat; kadar ketersebaran ketinggian gelombang, jarak antara azimut dan perambatan berada dalam taburan trivariat negatif eksponen, pemerosotan ketinggian ombak di saluran lurus dalam lebar jisim gelongsoran tanah adalah paling lambat, diikuti dengan ombak di saluran lurus di luar lebar jisim gelongsoran tanah dan pemerosotan ketinggian ombak di saluran lengkung adalah terbaik. Bidang gelombang empirik ini adalah berdasarkan data ujian, diabstrak secara saintifik dengan ketetapan umum perambatan dan pemerosotan pusuan gelongsoran tanah, yang boleh digunakan untuk analisis dan ramalan tentang pusuan gelongsoran tanah yang sama dan secara saintifik dan tepat menentukan julat kerosakan pusuan gelongsoran tanah.
Kata kunci: pusuan gelongsoran tanah; ketetapan perambatan; ketetapan pemerosotan, pemetaan ruang tensor; model matematik empat dimensi; bidang gelombang empirik; julat kerosakan
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*Pengarang untuk surat-menyurat; email: xie_liquan@tongji.edu.cn
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